JP6428399B2 - Image forming apparatus, image forming apparatus control method, and program - Google Patents

Description

  The present invention relates to an image forming apparatus, an image forming apparatus control method, and a program, and more particularly to an image forming apparatus having a configuration for detecting opening and closing of an apparatus housing cover, an image forming apparatus control method, and a program.

  2. Description of the Related Art Conventionally, some electrophotographic image forming apparatuses operate in a power saving mode for reducing power consumption. Various proposals have been made to detect that the exterior cover of the image forming apparatus is opened and closed during the power saving mode. In Patent Document 1, even in the power saving mode in which the drive system power supply voltage is cut off, the control system power supply voltage is always in a power supply state by being connected to the drive system power supply line via a diode. A system is described in which the exterior cover open / close detection means is operated by this control system power supply voltage to detect the opening / closing of the exterior cover during the power saving mode.

JP 2006-159740 A

  In Patent Document 1, even during the power saving mode, the control system power supply voltage is always in a power supply state by being connected to the drive system power supply line via a diode, so that the control of the CPU connected to the control system power supply voltage is possible. The system circuit group is in an operating state. Even in the power saving mode, power in the circuit group of the control system is consumed, and the power consumption in the power saving mode may be insufficiently reduced.

  The present application has been proposed in view of the above-described problems, and an object thereof is to provide an image forming apparatus capable of detecting opening and closing of a cover of an apparatus housing with power saving during the power saving mode.

  An image forming apparatus according to the present application includes a housing cover and a power switch, and a power supply unit capable of switching between an operation state for outputting a control system power supply voltage and a stop state for stopping output of the control system power supply voltage; A small-capacity power supply unit that has a power supply capacity smaller than that of the power supply unit and outputs a smoothed voltage by smoothing the commercial AC voltage, a control unit that is fed with the control system power supply voltage, and a monitoring unit that is supplied with the smoothed voltage And the monitoring unit includes a first detection process for detecting that the housing cover has been opened in a stopped state of the power supply unit, and a first storage process for storing a detection result in the first detection process, A second detection process for detecting that the power switch is operated, and a first activation command for instructing the power supply unit to switch from the stop state to the operation state in response to the detection of power-on by the second detection process. And the control unit The detection result stored by the first storage process is acquired from the monitoring unit in response to the switching of the unit to the operation state, and when the detection result indicates that the housing cover has been opened, a preparatory operation is performed. And performing a first activation process in which the preparatory operation is not performed when the case cover is not opened.

  Even when the power supply unit is stopped, the monitoring unit is supplied with the voltage smoothed by the small-capacity power supply unit. Thereby, the monitoring part can perform a 1st detection process, a 1st memory | storage process, a 2nd detection process, and a 1st starting command process. In the stop state of the power supply unit, the monitoring unit detects that the housing cover has been opened by the first detection process, and stores the detection result in the first storage process. Further, in response to detecting that the power switch has been operated in the second detection process, the power supply unit is instructed to switch from the stop state to the operation state in the first start command process. As a result, the power supply unit is switched from the stopped state to the operating state.

  The control unit acquires a detection result from the monitoring unit in response to the power supply unit being switched to the operating state, and performs a preparatory operation when the detection result indicates that the housing cover has been opened. When the body cover is not opened, the preparatory operation is not performed. Here, the housing cover is a cover or the like that is provided in an opening portion opened in the housing and is opened and closed by the user. For example, a housing cover that is opened and closed when a process cartridge is attached and detached, a paper feed tray that is opened and closed to supply paper, and the like. Further, the preparatory operation is a known rounding and correction process. When the housing cover is opened, the process cartridge may be replaced by the user or the paper may be supplied to the paper feed tray, and it is necessary to execute a preparatory operation before the printing process. When the housing cover is not opened, power saving can be achieved by omitting the preparation operation, and deterioration of members such as toner due to the preparation operation can be suppressed. Even when the power supply unit is in a stopped state and the control system power supply voltage is not supplied and the control unit stops operating, the monitoring unit to which the voltage is supplied from the small-capacity power supply unit opens and closes the case cover Minimal monitoring of switch operation can be performed. The control unit stops operating, and can realize a power saving state that is suppressed to a minimum power consumption necessary for the monitoring unit to operate. In addition, when the power supply unit is switched to the operating state, in addition to switching according to the first activation command process, the power supply is resumed after the commercial AC voltage power supply is stopped and the power supply unit is in the operating state. There are some cases.

  Further, in the image forming apparatus according to the present application, the control unit executes a setting process for setting a direct switching mode for instructing the power supply unit to switch to the operating state subsequent to the first detection process, The monitoring unit instructs the power supply unit to switch to the stop state in response to the second storage process storing the direct switching mode according to the setting process and the direct switching mode being stored by the second storage process. When the direct switching mode is stored by the second storage process, the monitoring unit instructs the power supply unit to switch to the operating state in response to the detection by the first detection process. The controller executes the second start command process, and the control unit sets the first start to the monitor unit on the condition that the monitor unit executes the first detection process after the power source unit is switched to the operating state by the second start command process. Memory command processing that commands execution of memory processing The running, monitoring unit, upon the completion of the first storage processing, and a second stop command processing for instructing switching to the stop state to the power supply unit may be configured to run.

  By setting the monitoring unit to the direct switching mode, the monitoring unit instructs the power supply unit to switch to the operating state in response to the detection of the first detection process. Thereby, every time the housing cover is opened, the control unit is supplied with the control system power supply voltage. When the control system power supply voltage is supplied, the control unit instructs the monitoring unit to execute the first storage process. Even when the monitoring unit does not have a function of executing the first storage process in response to the detection of the first detection process, the power supply unit is switched to the operating state and the control system power supply voltage is supplied to the control unit. Thus, the monitoring unit can execute the first storage process. The control unit is temporarily activated when the housing cover is opened. Since the operation period of the control unit is limited, power can be saved.

  In the image forming apparatus according to the present application, when the direct switching mode is stored by the second storage process, the monitoring unit executes a counting process for counting the number of times of detection by the first detection process, The process may be executed when the number of detections counted by the counting process is 1.

  When the housing cover is first opened, the monitoring unit executes the second activation command process and does not execute the second activation command process for the second time and thereafter. Thereby, when the case cover is opened for the second time and thereafter, the control unit is not operated, and power can be saved.

  Further, in the image forming apparatus according to the present application, the control unit executes a timing process for measuring a time from when the power supply unit is switched to the operating state by the second activation command process until the housing cover is closed, The process may be configured to be executed when the time measured by the time measurement process is a predetermined time or more.

  When the elapsed time from when the power supply unit is switched to the operating state in response to detecting that the housing cover is opened by the first detection processing is less than a predetermined time after the housing cover is closed The memory command process is not executed. Here, the predetermined time is, for example, a time required for the user to replace the process cartridge or a time required for supplying paper. If the elapsed time is less than the predetermined time, it is determined that the process cartridge has not been replaced or the paper has not been supplied, so that it is determined that the preparation operation is not necessary. Unnecessary preparatory operations can be omitted, and deterioration of members due to the preparatory operations can be suppressed.

  Further, in the image forming apparatus according to the present application, the monitoring unit includes a detection terminal that detects that the housing cover has been opened, and is configured by a series of a detection switch and a resistor that are turned on and off according to opening and closing of the housing cover. The detection switch and the contact of the resistor are connected to the detection terminal, the smoothed voltage is supplied to one end that is not the contact of the detection switch and the resistor, and the grounding terminal is connected to the other end, and the opening and closing of the housing cover It is good also as a structure provided with the switch circuit which switches according to the state of a detection terminal whether the switching signal which alert | reports to a control part is produced | generated from a control system power supply voltage.

  In the operating state of the power supply unit, the detection switch is turned on and off in response to the opening of the housing cover, a signal is generated from the control system power supply voltage by the switch circuit, and the opening of the housing cover to the control unit Informed. On the other hand, since the control system power supply voltage is not supplied in the stop state of the power supply unit, an open / close signal for notifying the control unit of opening / closing of the housing cover is not generated regardless of the state of the detection terminal. As a result, it is possible to prevent damage to the control unit that may occur when an open / close signal is input to the control unit in a state where the control system power supply voltage is not supplied. On the other hand, regardless of the operating state and the stopped state of the power supply unit, the monitoring unit is notified that the housing cover has been opened from the detection terminal. With one configuration of the detection switch, opening / closing of the housing cover can be detected in either the operating state or the stopped state of the power supply unit.

  Further, in the image forming apparatus according to the present application, the small-capacity power supply unit includes a rectifying unit that rectifies a commercial AC voltage and outputs a primary smoothed voltage, a capacitor that outputs a secondary smoothed voltage obtained by further smoothing the primary smoothed voltage, And a rectifying element interposed in the direction from the rectifying unit to the capacitor, the primary smoothing voltage being fed to the detection circuit, the secondary smoothing voltage being fed to the monitoring unit, and the detection switch It is good also as a structure which will be in an ON state, when a body cover is closed.

  In a configuration in which a ground voltage is connected to the detection switch, the detection switch is turned off when the housing cover is opened in the operating state of the power supply unit, and the primary smoothing voltage is supplied to the detection terminal via the detection circuit. Is applied. On the other hand, when the housing cover is closed, the detection switch is turned on, and the ground voltage is applied to the detection terminal. Alternatively, in the configuration in which the primary smoothing voltage is connected to the detection switch, the detection switch is turned off and the detection terminal is connected via the detection circuit when the housing cover is opened in the operating state of the power supply unit. A ground voltage is applied. On the other hand, when the housing cover is closed, the detection switch is turned on and a primary smoothing voltage is applied. The switch circuit switches whether to generate an open / close signal according to the voltage applied to the detection terminal. As a result, the control unit is notified that the housing cover has been opened. Since the detection switch is turned on while the housing cover is closed, a current path from the primary smoothing voltage to the ground voltage is created, but the rectifier element prevents the current from flowing from the capacitor to the rectifier, so the capacitor It can be charged efficiently.

  Further, in the image forming apparatus according to the present application, the small-capacity power supply unit includes a rectifying unit that rectifies a commercial AC voltage and outputs a primary smoothed voltage, a capacitor that outputs a secondary smoothed voltage obtained by further smoothing the primary smoothed voltage, And a rectifying element interposed in the path from the rectifying unit to the capacitor as a forward direction, the secondary smoothed voltage is fed to the detection circuit and the monitoring unit, and the detection switch has a housing cover closed. It is good also as a structure which will be in an OFF state when it exists.

  In the configuration in which the ground voltage is connected to the detection switch, when the housing cover is opened in the operating state of the power supply unit, the detection switch is turned on and the ground voltage is applied to the detection terminal. On the other hand, when the housing cover is closed, the detection switch is turned off, and the secondary smoothing voltage is applied to the detection terminal via the detection circuit. Alternatively, in a configuration in which a secondary smoothing voltage is connected to the detection switch, the detection switch is turned on when the housing cover is opened in the operating state of the power supply unit, and the secondary smoothing voltage is applied to the detection terminal. Is applied. On the other hand, when the housing cover is closed, the detection switch is turned off, and the ground voltage is applied to the detection terminal via the detection circuit. The switch circuit switches whether to generate an open / close signal according to the voltage applied to the detection terminal. As a result, the control unit is notified that the housing cover has been opened. Even when the supply of the commercial AC voltage is stopped, the monitoring unit and the detection circuit are supplied with the capacitor, so that the monitoring unit can continue the operation and execute the first detection process.

  In the image forming apparatus according to the present application, the switch circuit includes a PMOS transistor, the control power supply voltage is supplied to the source terminal of the PMOS transistor, the gate terminal is connected to the detection terminal, and an open / close signal is output from the drain terminal. It is good.

  In the operating state of the power supply unit, a ground voltage or a primary smoothing voltage or a secondary smoothing voltage is applied to the gate terminal of the PMOS transistor via the detection circuit or the detection circuit according to opening / closing of the housing cover. When the primary smoothing voltage or the secondary smoothing voltage is applied to the gate terminal via the detection circuit, the PMOS transistor is turned off and no open / close signal is generated. On the other hand, when a ground voltage is applied to the gate terminal via the detection circuit, the PMOS transistor is turned on and an open / close signal is generated. As a result, the control unit is notified that the housing cover has been opened. On the other hand, since the control system power supply voltage is not supplied to the source terminal of the PMOS transistor in the stop state of the power supply unit, the open / close signal is not generated regardless of the gate voltage. Thereby, an open / close signal is not input to the control unit to which the control system power supply voltage is not supplied, and the control unit can be prevented from being damaged.

  In the image forming apparatus according to the present application, the control unit does not store the detection result in the first detection process by the first storage process in response to the rise of the control system power supply voltage, and the detection by the second detection process. In a case where the third activation process for performing the preparatory operation is not performed, the third activation process may be performed.

  When the detection result in the first detection process is not stored and the detection by the second detection process is not performed, the detection result that the housing cover is opened is not stored, and the power switch is operated. This is a case where the power supply unit is switched to the operating state without any change. The case where the power supply unit is switched to the operating state without operating the power switch is a case where the power supply is resumed after the supply of the commercial AC voltage is stopped and the power supply unit is in the operating state. Since the detection by the detection switch is not executed during the period when the supply of the commercial AC voltage is stopped, the first detection result is not stored even if the housing cover is opened or closed. Therefore, even if the detection result in the first detection process is not stored, the preparation operation is performed when the detection by the second detection process is not performed. Thereby, it is possible to execute a preparatory operation necessary when the housing cover is opened.

  Further, in the image forming apparatus according to the present application, the monitoring unit executes an initialization notification process for notifying that the initialization has been performed, and the control unit performs notification by the initialization notification process in response to the rise of the control system power supply voltage. In a case where the fourth activation process for performing the preparatory operation is executed when the operation is performed.

  The case where the monitoring unit is initialized is when the supply of the commercial AC voltage or the power supply by the capacitor is stopped, and the stored information stored in the monitoring unit is lost. In this case, since the detection by the detection switch may not have been executed, a preparatory operation is performed. As a result, a necessary preparation operation can be executed.

  Further, the invention according to the present application is not limited to the invention of the image forming apparatus, and can be implemented as an invention of a control method in the image forming apparatus and an invention of a program for controlling the image forming apparatus.

  According to the image forming apparatus and the like according to the present application, it is possible to detect opening / closing of the cover of the apparatus housing with power saving during the power saving mode.

It is sectional drawing which shows schematic structure of the laser printer of embodiment. It is a block diagram which shows schematic structure of a laser printer. It is a figure explaining the circuit structure of the power supply part which concerns on Embodiment 1, a control part, a power switch, a cover switch, and a tray switch. 4 is a flowchart showing processing contents of OFF mode processing 1 according to the first embodiment. 5 is a flowchart showing the processing contents of a rounding determination process according to the first embodiment. It is the table 1 explaining the presence or absence of the glass turning which concerns on Embodiment 1. FIG. 6 is a flowchart showing processing contents of OFF mode processing 2 according to the second embodiment. It is a figure explaining the circuit structure of the power supply part which concerns on Embodiment 2, a control part, a power switch, a cover switch, and a tray switch. It is the table 2 explaining the presence or absence of the loose rotation which concerns on Embodiment 3. FIG.

  A configuration of a laser printer (hereinafter abbreviated as a printer) 1 according to the present application will be described with reference to FIG. The printer 1 is a so-called tandem laser printer that uses four color toners.

  In the following description, the direction will be described with reference to the user who uses the printer 1. That is, in FIG. 1, the right side is “front”, the left side is “rear”, the front side is “left”, and the back side is “right”. Also, the vertical direction in FIG.

  As shown in FIG. 1, the printer 1 has a substantially box-shaped main body housing 2, and a paper feeding unit 10, an image forming unit 20, and the like are housed inside the main body housing 2. A discharge tray 5 is formed on the upper surface of the main body housing 2, and the sheets P on which images are formed are stored in a stacked state.

  The sheet feeding unit 10 includes a sheet feeding tray 11 in which sheets P are accommodated, a pickup roller 12, a separation pad 13, a pressure plate 14, and various rollers. The paper feed tray 11 is configured to be detachable from the lower portion of the main body housing 2. The pressure plate 14 is provided in the paper feed tray 11, and a displacement mechanism (not shown) is provided below the pressure plate 14. The displacement mechanism moves upward and inclines before the image forming operation described later. As a result, the sheet P accommodated in the paper feed tray 11 is brought closer to the pickup roller 12 by the pressure plate 14, separated one by one by the pickup roller 12 and the separation pad 13, and conveyed to the image forming unit 20 by various rollers. Is done.

  The image forming unit 20 is disposed at a substantially central portion inside the main body housing 2 and includes process cartridges 30C, 30M, 30Y, and 30K, an exposure unit 40, a transfer unit 50, and a fixing unit 60.

  The process cartridges 30C, 30M, 30Y, and 30K contain cyan, magenta, yellow, and black toners, respectively. The four process cartridges 30C to 30K are provided in the order of the process cartridges 30K, 30Y, 30M, and 30C from the front to the rear of the printer 1. Further, the process cartridges 30C to 30K are installed detachably by opening the front cover 2a provided in the main body housing 2.

  The process cartridge 30C includes a photosensitive drum 31, a charger 32, a toner cartridge 33C, and the like. The other process cartridges 30M, 30Y, and 30K have different toner colors, but the other configurations are the same as those of the process cartridge 30C. For this reason, in the following description, the process cartridge 30C will be described as a representative, and description of the other process cartridges 30M, 30Y, and 30K will be omitted as appropriate.

  The charger 32 is a scorotron charger having a charging wire 32a and a grid portion 32b. The charger 32 uniformly positively charges the surface of the photosensitive drum 31 prior to forming an electrostatic latent image on the surface of the photosensitive drum 31 during image formation.

  The toner cartridge 33C includes a toner storage chamber 33a, an agitator 33e, a developing roller 33f, and the like. The toner storage chamber 33a stores cyan toner. The agitator 33e agitates the toner stored in the toner storage chamber 33a. The developing roller 33 f is disposed on the downstream side of the charger 32 along the rotation direction of the photosensitive drum 31. A positive voltage is applied to the roller shaft of the developing roller 33f. As a result, a potential difference is formed between the developing roller 33f and the potential of the electrostatic latent image formed on the photosensitive drum 31, and the toner moves to the photosensitive drum 31 by the developing roller 33f.

  The exposure unit 40 is disposed at the uppermost position inside the main body housing 2 and includes a laser light source, a polygon mirror, and the like (not shown). The laser beam emitted from the laser light source is deflected by the polygon mirror and applied to the surface of the photosensitive drum 31. Thereby, an electrostatic latent image is formed.

  The transfer unit 50 is disposed above the sheet feeding unit 10 and below the process cartridge 30. The transfer unit 50 forms a color image on the sheet P while conveying the sheet P fed by the sheet feeding unit 10 toward the discharge tray 5. The transfer unit 50 includes a driving roller 51, a driven roller 52, a conveyor belt 53, a plurality of transfer rollers 54, and the like.

  The conveyor belt 53 is an endless belt configured by an annular belt. Between the driving roller 51 positioned below the rear end of the process cartridge 30C and the driven roller 52 positioned below the front end of the process cartridge 30K. It is stretched over.

  Each transfer roller 54 is in contact with the conveyance belt 53 from the back side of the sheet conveyance surface 53A at a position facing each photosensitive drum 31 with the sheet conveyance surface 53A of the conveyance belt 53 interposed therebetween. Each transfer roller 54 transfers a toner image carried on the surface of the photosensitive drum 31 to a sheet P conveyed on the sheet conveyance surface 53A by applying a transfer current at a predetermined timing.

  The fixing unit 60 is disposed downstream of the transfer unit 50 in the transport direction. The fixing unit 60 includes a heating roller 61 and a pressure roller 62 and fixes the toner image transferred to the sheet P.

  Next, the operation at the time of image formation in the printer 1 will be described. The surface of each photosensitive drum 31 is uniformly positively charged by each charger 32 and exposed by the exposure unit 40 based on the print data. Thereby, an electrostatic latent image corresponding to each toner color is formed on the surface of each photosensitive drum 31. Next, toner is supplied to the electrostatic latent image formed on the surface of the photosensitive drum 31 by the developing roller 33f. As a result, the electrostatic latent image on the surface of the photosensitive drum 31 is visualized, and a toner image is carried on the surface of the photosensitive drum 31.

  On the other hand, the sheet P is conveyed to the image forming unit 20 by the sheet feeding unit 10 at a predetermined timing. The toner image carried on the surface of the photosensitive drum 31 is transferred to the sheet P by a transfer current applied to the roller shaft of the transfer roller 54. Then, the toner is conveyed to the fixing unit 60 and the toner is thermally fixed to the sheet P. Thereafter, the sheet P is discharged to the discharge tray 5 by the discharge roller 65.

  Next, a schematic configuration of the printer 1 will be described with reference to FIG. The printer 1 includes a control unit 80, a power supply unit 90, a power switch SW1, a cover switch SW2, a tray switch SW3, a printer power switch 71, and the like in addition to the paper feeding unit 10 and the image forming unit 20 shown in FIG. The control unit 80 includes a CPU 81, a ROM 82, a RAM 83, a monitoring IC 84, and the like. The CPU 81 executes various programs stored in the ROM 82 to control the paper feeding unit 10 and the image forming unit 20 connected via the bus 85. The ROM 82 stores a control program and various data. The RAM 83 is used as a main storage device for the CPU 81 to execute various processes.

  The printer power switch 71 is a switch for the user to operate the power supply of the printer 1. The power switch SW1 includes a contact that opens and closes in conjunction with the on / off of the printer power switch 71. The cover switch SW2 includes a contact that opens and closes in conjunction with the opening and closing of the front cover 2a. The tray switch SW3 includes a contact that opens and closes in conjunction with the opening and closing of the paper feed tray. The power supply unit 90 generates power supply voltages V1 and V2 and smoothing voltages V3 and V4 described later from an AC voltage Vac (described later). The generated power supply voltages V1 and V2 and smoothing voltages V3 and V4 are supplied to the control unit 80, the paper feeding unit 10, the image forming unit 20 and the like through power supply lines (not shown).

  The printer 1 has a normal mode and an OFF mode as operation modes. In the normal mode, the power supply unit 90 operates, and the power supply voltages V1 and V2 and the smoothing voltages V3 and V4 are supplied to each unit of the printer 1. On the other hand, in the OFF mode, a part of the power supply unit 90 operates to save power, and the smoothing voltages V3 and V4 are supplied to a part of the printer 1.

  The circuit configuration of the power supply unit 90, the control unit 80, the power switch SW1, the cover switch SW2, and the tray switch SW3 according to the first embodiment will be described with reference to FIG.

  The power supply unit 90 includes a high-voltage power supply unit 91, a DC-DC converter 92, a small-capacity power supply unit 93, a voltage limiting circuit 94, a diode D1, a capacitor C1, a resistor R1, a resistor R2, and the like. The high-voltage power supply unit 91 generates a power supply voltage V1 of, for example, 24 VDC from the AC voltage Vac fed from the AC power supply 100 in the normal mode. The power supply voltage V1 is supplied to the paper feeding unit 10, the image forming unit 20, and the like. The high-voltage power supply unit 91 has a power supply control IC 95. The power supply control IC 95 controls the operation of the high voltage power supply unit 91. A DC-DC converter 92 is connected to the subsequent stage of the high-voltage power supply unit 91. The DC-DC converter 92 generates a power supply voltage V2 of, for example, DC 3.3V from the power supply voltage V1. The power supply voltage V2 is supplied to the CPU 81 and the like. The power supply voltage V2 is input to the port P1 of the monitoring IC 84. Thereby, the monitoring IC 84 can detect whether or not the high-voltage power supply unit 91 is operating and generating the power supply voltage V1. In the normal mode, the high voltage power supply unit 91 does not generate the power supply voltage V1, and the CPU 81 stops operating.

  The small-capacity power supply unit 93 has a smaller power supply capacity than the high-voltage power supply unit 91. A voltage limiting circuit 94 is connected to the subsequent stage of the small capacity power supply unit 93. The small-capacity power supply unit 93 generates a DC voltage in the normal mode and the OFF mode, and the generated DC voltage is input to the voltage limiting circuit 94. When the AC voltage Vac increases, the voltage limiting circuit 94 suppresses an increase in the DC voltage output from the small-capacity power supply unit 93 and outputs the smoothed voltage V3. The smoothed voltage V3 is input to the port P4 of the monitoring IC 84 via the resistor R1 and to the port P5 of the monitoring IC 84 via the resistor R2. A diode D 1 is connected to the subsequent stage of the voltage limiting circuit 94. The smoothing voltage V3 is input to the anode of the diode D1, and the smoothing voltage V4 is output from the cathode. The smoothing voltage V4 is supplied to the monitoring IC 84. Thereby, the monitoring IC 84 operates in the normal mode and the OFF mode. A capacitor C1 is connected between the cathode of the diode D1 and the ground voltage. The capacitor C1 is a power storage capacitor, for example, an electric double layer capacitor. The capacitor C1 is charged with the smoothing voltage V4. Even when the supply of the AC voltage Vac is stopped, the monitoring IC 84 can operate during the period in which the power stored in the capacitor C1 is supplied.

  In addition to the CPU 81 and the monitoring IC 84, the control unit 80 includes transistors Q1 and Q2, which are PMOS transistors, a resistor R3, and the like. The CPU 81 and the monitoring IC 84 perform signal transmission / reception through communication. The port P2 of the monitoring IC 84 and the power supply control IC 95 are connected by a signal line, and signals are transmitted and received.

  A power switch SW1 is connected between the port P3 and the ground voltage. A resistor R3 is connected between the port P3 and the smoothing voltage V4. While the printer power switch 71 is turned on by the user and the printer 1 is powered on, the printer power switch 71 is closed. The monitoring IC 84 can detect that the printer power switch 71 is turned on by the user when the input signal to the port P3 transitions from the smooth voltage V4 to the ground voltage.

  Cover switch SW2 is connected between port P4 and the ground voltage. Port P4 is connected to the gate terminal of transistor Q1. The source terminal of the transistor Q1 is connected to the power supply voltage V2, and the cover open / close signal Sig1 is output from the drain terminal. While the front cover 2a is closed, the cover switch SW2 is in a closed state. The cover opening / closing signal Sig1 is input to the CPU 81.

  Transistor Q2 is connected in the same manner as transistor Q1. That is, the gate terminal of the transistor Q2 is connected to the port P5, the source terminal is connected to the power supply voltage V2, and the tray open / close signal Sig2 is output from the drain terminal and input to the CPU 81. The tray switch SW3 is connected between the port P5 and the ground voltage. While the paper feed tray 11 is closed, the tray switch SW3 is in a closed state.

  Next, a method for detecting the opening of the front cover 2a and the paper feed tray 11 in the normal mode and the OFF mode will be described.

  Since the high voltage power supply unit 91 operates in the normal mode, the power supply voltage V2 is supplied to the source terminals of the transistors Q1 and Q2. Since the ground voltage is applied to the gate terminal of the transistor Q1 while the front cover 2a is closed, the transistor Q1 is turned on and the cover open / close signal Sig1 is output from the drain terminal. On the other hand, since the smooth voltage V3 is applied to the gate terminal of the transistor Q1 while the front cover 2a is open, the transistor Q1 is turned off and the cover open / close signal Sig1 is not output from the drain terminal. Transistor Q2 operates in the same manner as transistor Q1. That is, the tray open / close signal Sig2 is output from the drain terminal while the paper feed tray 11 is closed, and the tray open / close signal Sig2 is not output from the drain terminal while the paper feed tray 11 is open. The CPU 81 can detect that the front cover 2a is in an open state during a period when the cover open / close signal Sig1 is not input. Further, it can be detected that the paper feed tray 11 is open during the period when the tray open / close signal Sig2 is not input.

  On the other hand, in the OFF mode, the high-voltage power supply unit 91 stops operating, and thus the power supply voltage V2 is not supplied to the source terminals of the transistors Q1 and Q2. For this reason, the cover opening / closing signal Sig1 and the tray opening / closing signal Sig2 are not output. In the OFF mode, the monitoring IC 84 detects opening / closing of the front cover 2a and the paper feed tray 11 instead of the CPU 81 that stops the operation. Even in the OFF mode, the small-capacity power supply unit 93 operates and the smoothing voltage V3 is supplied to the resistors R1 and R2. If the input signal to the port P4 is the ground voltage, the monitoring IC 84 can detect that the front cover 2a is in the closed state. On the other hand, if the input signal to the port P4 is the smooth voltage V3, it can be detected that the front cover 2a is in the open state. The monitoring IC 84 can detect the state of the paper feed tray 11 as with the front cover 2a. That is, when the input signal to the port P5 is the ground voltage, it can be detected that the paper feed tray 11 is in the closed state, and when the smoothing voltage V3 is in the open state.

  By the way, while the cover switch SW2 is closed, a current path is formed from the smoothed voltage V3 to the ground voltage via the resistor R1 and the cover switch SW2. Further, while the tray switch SW3 is closed, a current path is formed from the smoothed voltage V3 to the ground voltage via the resistor R2 and the cover switch SW2. However, the current path from the capacitor C1 to the smoothed voltage V3 is blocked by the diode D1. For this reason, the capacitor C1 is efficiently charged while the AC voltage Vac is supplied. Further, when the supply of the AC voltage Vac is stopped, the current path from the capacitor C1 to the smooth voltage V3 is interrupted by the diode D1, so that the discharge of the capacitor C1 is suppressed and the operating time of the monitoring IC 84 is ensured. Can do.

  The cover opening / closing signal Sig1 is input to the image forming unit 20 and the like in addition to the CPU 81. Specifically, it is input to a control circuit that controls an applied voltage to a portion to which a high voltage is applied, such as the laser light source of the exposure unit 40 and the charger 32 included in the image forming unit 20. This is because when the front cover 2a is opened, it is necessary to cut off the high voltage for the safety of the user.

  The monitoring IC 84 has a first register 86, a second register 87, and a third register 88. The first register 86 stores that the printer power switch 71 is turned on. The second register 87 stores that the front cover 2a has been opened (hereinafter referred to as cover history). The third register 88 stores that the paper feed tray 11 has been opened (hereinafter referred to as tray history).

  Here, the case where the supply of the AC voltage Vac is stopped will be described. When the supply of the AC voltage Vac is stopped, there are a case where the power cord of the printer 1 is disconnected by the user and a power failure. When the supply of the AC voltage Vac is stopped, the CPU 81 stops the operation because the power supply voltage V2 is not supplied regardless of the operation mode. On the other hand, the monitoring IC 84 can continue to operate during a period in which power is supplied from the capacitor C1. However, since the smoothing voltage V3 is not generated, it cannot be detected whether or not the front cover 2a and the paper feed tray 11 are opened.

  By the way, when the process cartridge 30 is replaced by the user, or when the remaining amount of the sheet P in the paper feed tray 11 is changed, it is necessary to execute a known glass turning prior to the image forming operation. Note that the wheel turning includes an operation of rotating the agitator 33e and an operation of displacing the pressure plate 14. When the process cartridge 30 is replaced, since the front cover 2a is opened, whether or not the process cartridge 30 has been replaced can be estimated based on whether or not the front cover 2a is opened. Similarly, whether or not the remaining amount of the sheet P has been changed can be estimated based on whether or not the paper feed tray 11 has been opened.

  In the normal mode, since the CPU 81 is operating, the CPU 81 can determine whether or not the front cover 2a and the paper feed tray 11 have been opened, and can determine whether or not it is necessary to perform the rotation. . On the other hand, in the OFF mode, since the CPU 81 stops its operation, the monitoring IC 84 monitors whether or not the front cover 2a and the paper feed tray 11 are opened. The cover history is stored in the second register 87 in response to the opening of the front cover 2a. The tray history is stored in the third register 88 in response to the paper feed tray 11 being opened. Thereby, for example, after the printer 1 shifts from the OFF mode to the normal mode, the CPU 81 refers to the values of the second register 87 and the third register 88 to determine whether the cover history and the tray history are stored, respectively. It is possible to determine whether or not it is necessary to execute the rotation. Next, the monitoring of the front cover 2a and the paper feed tray 11 in the OFF mode and the process of turning the glass after shifting to the normal mode will be described in detail.

  First, the OFF mode processing 1 according to the first embodiment will be described with reference to FIG. The OFF mode process 1 is a process for the monitoring IC 84 to monitor whether or not the front cover 2a and the paper feed tray 11 are opened in the OFF mode. Note that the processing associated with the opening and closing of the paper feed tray 11 is executed in the same manner as the front cover 2a, and therefore the description in the flowchart is omitted. In the OFF mode processing 1, the monitoring IC 84 is provided with a function capable of storing the cover history and the tray history in the second register 87 in response to detecting that the front cover 2a and the paper feed tray 11 are opened. This process is applied when

  First, in the normal mode, the CPU 81 determines whether or not the printer power switch 71 is turned off (S1). When the printer power switch 71 is turned off by the user, the power switch SW1 is opened. As a result, the input signal to the port P3 transitions from the ground voltage to the smooth voltage V4, so that the monitoring IC 84 can detect that the printer power switch 71 is turned off. Through communication with the monitoring IC 84, the CPU 81 can detect that the printer power switch 71 is turned off. In response to determining that the printer power switch 71 is not turned off (S1: NO), the process returns to step S1 and waits. On the other hand, when it is determined that the printer power switch 71 is turned off (S1: YES), the CPU 81 detects that the cover switch SW2 and the tray switch SW3 are opened in order to make the monitoring IC 84 monitor in the OFF mode. Are set to be stored in the second register 87 and the third register 88, respectively (S3).

  Next, the CPU 81 outputs a stop command for instructing the power supply control IC 95 to stop the output of the power supply voltage V1 through communication or a signal line (not shown). As a result, the high-voltage power supply unit 91 stops outputting the power supply voltage V1, the printer 1 is shifted to the OFF mode (S5), and the CPU 81 stops its operation. In the OFF mode, the monitoring IC 84 determines whether or not the cover switch SW2 is opened (S7). Since the cover switch SW2 is opened when the front cover 2a is opened, the monitoring IC 84 can determine whether or not the front cover 2a is opened. In response to determining that the cover switch SW2 is opened (S7: YES), the monitoring IC 84 stores the cover history in the second register 87 (S9). Specifically, the value of the second register 87 is updated from the initial value 0 to 1. On the other hand, the monitoring IC 84 skips step S9 in response to determining that the cover switch SW2 is not open (S7: NO). Next, the same processing is executed for the paper feed tray 11. That is, the monitoring IC 84 stores the tray history in the third register 88 in response to determining that the tray switch SW3 has been opened. Specifically, the value of the third register 88 is updated from the initial value 0 to 1. On the other hand, the monitoring IC 84 does not store the tray history in the third register 88 in response to determining that the tray switch SW3 is not open.

  Next, the monitoring IC 84 determines whether or not the printer power switch 71 is turned on (S11). When the printer power switch 71 is turned on by the user, the power switch SW1 is closed, so that the ground voltage is input to the port P3 and it can be determined that the printer power switch 71 is turned on. In response to determining that the printer power switch 71 is turned on (S11: YES), the monitoring IC 84 outputs a command for restarting the operation to the power control IC 95 from the port P2 (S13). Also, the value of the first register 86 is updated from the initial value 0 to 1, and the process is terminated. On the other hand, when it is determined that the printer power switch 71 is not turned on (S11: NO), the process returns to step S7.

  Next, the glass turning process will be described with reference to FIG.

  When the high-voltage power supply unit 91 enters the operating state from the state where the generation of the power supply voltage V1 is stopped, the CPU 81 is supplied with the power supply voltage V2 and restarts the operation. Thereafter, the glass turning process is executed. When the high-voltage power supply unit 91 starts from the state in which the generation of the power supply voltage V1 is stopped, in addition to the case where the user turns on the printer power switch 71 in the above-described OFF mode processing 1, the AC voltage Vac There are cases where power supply is resumed. The case where the supply of the AC voltage Vac is resumed will be described in detail below.

  The power supply control IC 95 monitors the supply state of the AC voltage Vac. When the supply of the AC voltage Vac is stopped, the generation of the power supply voltage V1 is stopped in the high voltage power supply unit 91 regardless of the normal mode or the OFF mode. Next, when the supply of the AC voltage Vac is resumed, the power supply control IC 95 controls the high voltage power supply unit 91, and the generation of the power supply voltage V1 is resumed by the high voltage power supply unit 91.

  It is impossible to monitor whether or not the front cover 2a and the paper feed tray 11 are opened while the supply of the AC voltage Vac is stopped. Therefore, after the high-voltage power supply unit 91 resumes operation and the CPU 81 starts operation, whether or not there is a period during which the supply of the AC voltage Vac has been stopped in determining whether or not it is necessary to perform the rotation. It is necessary to judge whether. The CPU 81 can determine whether or not there is a period during which the supply of the AC voltage Vac has been stopped by determining whether or not the fact that the printer power switch 71 is turned on is stored in the first register 86. .

  The power supply control IC 95 controls the high voltage power supply unit 91 in response to receiving the command related to step S13 or the supply of the AC voltage Vac is resumed, and the high voltage power supply unit 91 generates the power supply voltage V1. Is resumed (S21). Thereby, the CPU 81 is supplied with the power supply voltage V2 and starts operating (S23). The CPU 81 reads the values of the first register 86, the second register 87, and the third register 88 of the monitoring IC 84, and determines whether or not the rotation can be omitted (S25). This will be described in detail using the table 1 in FIG. Table 1 is a table showing a correspondence between combinations of values of the first register 86, the second register 87, and the third register 88 and the presence or absence of the rotation. Here, when it is described with a “◯” mark in the “Gala” column, it indicates that the gala is executed, and when it is not described, it is omitted. When the value of the first register 86 is 1, it indicates that the printer has been returned to the normal mode when the printer power switch 71 is turned on by the user in the OFF mode. On the other hand, when the value of the register 1 is 0, it indicates that the printer power switch 71 is not operated by the user, that is, the supply of the AC voltage Vac is resumed. Further, when the value of the second register 87 is 1, it indicates that the front cover 2a is opened by the user in the OFF mode. On the other hand, when the value of the second register 87 is 0, it indicates that the front cover 2a is not opened by the user in the OFF mode. Similarly, when the value of the third register 88 is 1, it indicates that the paper feed tray 11 is opened, and when it is 0, it indicates that it is not opened.

  When the value of the first register 86 is 0 (No. 1 to 4), there is a period in which the supply of the AC voltage Vac is stopped, so that it is determined that the rotation is executed. This is because the front cover 2a and the paper feed tray 11 may be opened during the period in which the supply of the AC voltage Vac is stopped. When the value of the first register 86 is 1 (No. 5 to 8), in order to indicate that the mode has shifted from the OFF mode to the normal mode, the amount of rotation is changed according to the values of the second register 87 and the third register 88. Judgment is made. That is, when the values of the second register 87 and the third register 88 are both 0 (No 5), the front cover 2a and the paper feed tray are not opened, so that the glass turning is omitted. On the other hand, when the value of at least one of the second register 87 and the third register 88 is 1 (Nos. 6 to 8), since at least one of the front cover 2a and the paper feed tray is opened, the glass is rotated.

  Returning to FIG. 5, in response to determining that the rotation of the glass cannot be omitted (S25: NO), the glass rotation is executed (S27), and the process ends. On the other hand, if it is determined that the rotation of the glass can be omitted (S25: YES), the rotation of the glass is omitted and the process ends. Note that the values of the first register 86, the second register 87, and the third register 88 are initialized to 0 after the processing is completed. When the operation of rotating the agitator 33e included in the glass turning is performed, the toner deteriorates. Therefore, toner deterioration can be suppressed by omitting unnecessary glass turning.

  Here, the front cover 2a and the paper feed tray 11 are examples of a housing cover. The printer power switch 71 is an example of a power switch. The power supply voltage V1 is an example of a control system power supply voltage. The high-voltage power supply unit 91 is an example of a power supply unit. The CPU 81 is an example of a control unit, and the monitoring IC 84 is an example of a monitoring unit. Step S7 is an example of a first detection process, and step S9 is an example of a first storage process. Step S11 is an example of a second detection process, and step S13 is an example of a first activation process. The glass turning is an example of the preparation operation. The glass turning process (FIG. 5) is an example of a first activation process. The ports P4 and P5 are examples of detection terminals, the cover switch SW2 and the tray switch SW3 are examples of detection switches, and the transistors Q1 and Q2 are examples of switch circuits. Further, the circuit constituted by the cover switch SW2 and the resistor R1, and the circuit constituted by the tray switch SW3 and the resistor R2 are examples of the detection circuit. The AC voltage Vac is an example of a commercial AC voltage. The small-capacity power supply unit 93 and the voltage limiting circuit 94 are examples of a rectifying unit, and the diode D1 is an example of a rectifying element. The glass turning (S27) executed according to the condition No. 1 in Table 1 is an example of the third activation process.

  As described above, according to the first embodiment described above, the following effects are provided.

  Even when the high-voltage power supply 91 is stopped, the monitoring IC 84 is supplied with the smoothing voltage V4 by the small-capacity power supply 93. As a result, the monitoring IC 84 can execute the OFF mode process 1. In the stopped state of the high-voltage power supply unit 91, the monitoring IC 84 stores the cover history in step S9 in response to detecting that the front cover 2a has been opened in step S7. Specifically, the value of the second register 87 is updated to 1. Similarly, the monitoring IC 84 stores the tray history in response to detecting that the paper feed tray 11 has been opened. That is, the value of the third register 88 is updated to 1. In the stopped state of the high-voltage power supply unit 91, the monitoring IC 84 instructs the power supply control IC 95 to switch from the stopped state to the operating state in step S13 in response to detecting that the printer power switch 71 has been operated in step S11. . Also, the value of the first register 86 is updated to 1. As a result, the high voltage power supply 91 is switched from the stopped state to the operating state.

  The CPU 81 acquires the values of the first register 86, the second register 87, and the third register 88 in response to the switching of the high voltage power supply unit 91 to the operating state, and the value of the first register 86 is 1. When the value of at least one of the second register 87 and the third register 88 is 1 (S25: NO), the glass is turned (S27), and both the values of the second register 87 and the third register 88 are 0. In such a case, no gearing is performed (S27: YES). The case where the value of the first register 86 is 1 indicates that monitoring of the front cover 2a and the paper feed tray 11 by the monitoring IC 84 is continued. When the front cover 2a and the paper feed tray 11 are opened in the operating state of the high voltage power supply unit 91, the front cover 2a and the paper feed tray are rotated in response to the high voltage power source unit 91 being switched to the operating state. If 11 is not open, the rattling is omitted. When the front cover 2a and the paper feed tray 11 are not opened, the rotation of the glass can be omitted to save power and to suppress the deterioration of the toner due to the rotation of the glass. Even when the high-voltage power supply unit 91 is in a stopped state and the power supply voltage V2 is not supplied and the CPU 81 stops operating, the monitoring IC 84 to which the smooth voltage V4 is supplied from the small-capacity power supply unit 93 causes the front cover 2a and It is possible to perform minimum monitoring related to the opening / closing of the paper feed tray 11 and the operation of the printer power switch 71. The CPU 81 stops operating, and can realize a power saving state that is suppressed to the minimum power consumption required for the monitoring IC 84 to operate.

  In the operating state of the high-voltage power supply unit 91, the cover switch SW2 and the tray switch SW3 are switched between open and closed according to the opening and closing of the front cover 2a and the paper feed tray 11, and the transistors Q1 and Q2 respectively open and close the cover from the power supply voltage V2. A signal Sig1 and a tray open / close signal Sig2 are generated. As a result, the CPU 81 is notified that the front cover 2a and the paper feed tray 11 have been opened. On the other hand, since the power supply voltage V2 is not supplied when the high-voltage power supply unit 91 is stopped, the cover open / close signal Sig1 and the tray open / close signal Sig2 are not generated regardless of the gate voltages of the transistors Q1 and Q2. It is possible to prevent the CPU 81 from being damaged that may be generated when the cover open / close signal Sig1 and the tray open / close signal Sig2 are input in a state where the power supply voltage V2 is not supplied to the CPU 81. On the other hand, the opening of the front cover 2a and the paper feed tray 11 is notified to the monitoring IC 84 from the ports P4 and P5 regardless of the operating state and the stopped state of the high-voltage power supply unit 91. With one cover switch SW2, the opening of the front cover 2a can be detected in either the operating state or the stopped state of the high-voltage power supply unit 91. Similarly, with a single tray switch SW3, it is possible to detect the opening of the paper feed tray 11 regardless of the state of the high-voltage power supply unit 91.

  When the front cover 2a is closed in the operating state of the high-voltage power supply unit 91, the cover switch SW2 is closed and the ground voltage is applied to the port P4 and the gate terminal of the transistor Q1, so that the transistor Q1 is covered. An open / close signal Sig1 is generated. Thereby, the CPU 81 is notified of the opening / closing of the front cover 2a. Similarly, when the paper feed tray 11 is closed, the transistor Q2 generates a tray open / close signal Sig2. Thereby, the CPU 81 is notified of the open / close of the paper feed tray 11. While the front cover 2a and the paper feed tray 11 are closed, the cover switch SW2 and the tray switch SW3 are closed, so that a current path from the smoothing voltage V3 to the ground voltage is created. However, the diode D1 causes the smoothing voltage V3 from the capacitor C1. Therefore, the capacitor C1 can be efficiently charged.

  In step S25, the CPU 81 makes a determination according to Table 1 (FIG. 6). When the value of the first register 86 is 0 (No. 1 to No. 4), the rotation is performed. The case where the value of the first register 86 is 0 indicates that the high-voltage power supply unit 91 has been switched to the operating state without the printer power switch 71 being turned on. That is, after the supply of the AC voltage Vac is stopped, the supply of power is resumed, and the high-voltage power supply unit 91 is in an operating state. Even if the front cover 2a or the paper feed tray 11 is opened during the period when the supply of the AC voltage Vac is stopped, the smoothing voltage V3 is not input to the ports P4 and P5. It cannot be recognized that the paper tray 11 has been opened. That is, the front cover 2a and the paper feed tray 11 cannot be monitored during the period when the supply of the AC voltage Vac is stopped. Even when the values of the second register 87 and the third register 88 are 0, that is, when it is not stored that the front cover 2a and the paper feed tray 11 are opened, the supply of the AC voltage Vac is stopped. Since the front cover 2a and the paper feed tray 11 may be opened during the period during which the paper is being rotated, the glass is turned. As a result, it is possible to execute the necessary glass turning.

  Next, OFF mode processing 2 according to the second embodiment will be described with reference to FIG. The OFF mode processing 2 has a function of storing the cover history and the tray history in the second register 87 and the third register 88 in response to detecting that the front cover 2a and the paper feed tray 11 are opened. This process is applied when the monitoring IC 84 is not provided. The same steps as those in the OFF mode processing 1 (FIG. 4) are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate. Further, since the processing associated with the opening and closing of the paper feed tray 11 is executed in the same manner as the front cover 2a, the description in the flowchart is omitted.

  First, the CPU 81 executes step S1 as in the OFF mode process 1. After determining that the printer power switch 71 has been turned off (S1: YES), setting an operation command for starting the high-voltage power supply unit 91 in response to detecting that the front cover 2a or the paper feed tray 11 has been opened (see FIG. Hereinafter, the activation setting is executed on the monitoring IC 84 (S31). As a result, the monitoring IC 84 stores the activation setting in a register (not shown). Next, the CPU 81 outputs a stop command to the power supply control IC 95. As a result, the high voltage power supply 91 stops (S5), and the printer 1 shifts to the OFF mode.

  Next, the monitoring IC 84 determines whether or not the cover switch SW2 is opened (S7). In response to determining that the cover switch SW2 is not opened (S7: NO), the monitoring IC 84 skips the next steps S33 to S45. On the other hand, in response to determining that the cover switch SW2 is opened (S7: YES), the monitoring IC 84 refers to the register in which the activation setting is stored, and when detecting that the front cover is opened, the power control IC 95. It is determined whether or not the operation command is set to be output (S33). In response to determining that the operation command is not output to the power supply control IC 95 (S33: NO), the following steps S35 to 45 are skipped. On the other hand, in response to determining that the setting is to output an operation command to the power supply control IC 95 (S33: YES), the operation command is output to the power supply control IC 95 (S35). Thereby, the high-voltage power supply unit 91 starts operation, and the CPU 81 is activated (S37).

  The CPU 81 confirms whether or not it is activated due to the opening of the front cover 2a by the cover opening / closing signal Sig1, and in response to determining that it is activated due to the opening of the front cover 2a, the CPU 81 uses a timer (not shown) to Start measuring elapsed time. Here, the reason why the CPU 81 confirms the activation is because the printer power switch 71 is turned on by the user in addition to the opening of the front cover 2a. Next, when the front cover 2a is closed (S39), the CPU 81 stops measuring the elapsed time, and the time from the activation until the front cover 2a is closed (hereinafter referred to as front cover open time). It is determined whether or not it is longer than a predetermined time (S41). Here, the predetermined time is the time required for the user to replace the cartridge. In response to determining that the front cover open time is less than the predetermined time (S41: NO), it is determined that the user has not replaced the cartridge, and thus the process proceeds to step S45. On the other hand, in response to determining that the front cover open time is equal to or longer than the predetermined time (S4: YES), since the cartridge may be replaced by the user, the CPU 81 stores the cover history in the second register 87 of the monitoring IC 84. Is stored (S9). Next, when it is detected that the front cover 2a is opened again, the monitoring IC 84 is set so as not to execute an operation instruction to the control IC of the high-voltage power supply unit 91 (S43). As a result, the operation instruction is not given to the power supply control IC 95 for the second and subsequent times after the recording in the second register 87 or the third register 88 and the execution of the gear rotation are set. When the front cover 2a and the paper feed tray 11 are opened for the second and subsequent times, the CPU 81 is not operated and power can be saved. Next, a stop command is output to the power supply control IC 95. As a result, the high-voltage power supply 91 stops operating (S45).

  Next, the same processing as steps S7 to S45 is executed for the paper feed tray 11 as well. That is, in response to determining that the paper feed tray 11 is opened, it is determined whether or not the activation setting is stored, and in response to determining that it is stored, an operation command is output to the power supply control IC 95. To do. After the activation, the CPU 81 measures the time until the paper feed tray 11 is closed, and records the tray history in the third register 88 and changes the activation setting in response to determining that it is equal to or longer than the predetermined time. Here, the predetermined time is, for example, the time required for the user to supply paper to the paper feed tray 11. On the other hand, in response to determining that the time is less than the predetermined time, the tray history is not recorded in the third register 88, and the activation setting is not changed. Next, the monitoring IC 84 outputs a stop command to the power supply control IC 95. Note that, in response to determining that the paper feed tray 11 is not opened and in response to determining that the activation setting is not stored, the processing subsequent to the processing of outputting an operation command to the power supply control IC 95 is skipped. To do. Next, steps S11 and S13 are executed.

  Here, step S31 is an example of a setting process and a second storage process. Step S5 is an example of a first stop command process, step S35 is an example of a second start command process, step S9 is an example of a storage command process, and step S45 is an example of a second stop command process.

  As described above, according to the above-described second embodiment, the following effects can be obtained.

  By setting the monitoring IC 84 to the activation setting, the monitoring IC 84 instructs the power supply control IC 95 to switch to the operating state in response to detecting the opening of the front cover 2a and the paper feed tray 11 in step S7 (S35). . Thus, every time the front cover 2a and the paper feed tray 11 are opened, the CPU 81 is supplied with the power supply voltage V2.

  Steps S41 and 43 can be omitted. In this case, every time the power supply voltage V2 is supplied, the CPU 81 records the cover history in the second register 87 of the monitoring IC 84 (S9). Even when the monitoring IC 84 does not have a function of recording in the second register 87 in response to detecting the opening of the front cover 2a, the high voltage power supply unit 91 is switched to the operating state, and the power supply voltage V2 is supplied to the CPU 81. By being supplied, the cover history can be stored in the second register 87 of the monitoring IC 84. Similarly, the tray history can be stored in the third register 88 of the monitoring IC 84 in response to detecting the opening of the paper feed tray 11. The CPU 81 is temporarily activated when the front cover 2a and the paper feed tray 11 are opened. Since the operation period of the CPU 81 is limited, power saving can be achieved.

  When the front cover 2a is first opened, the monitoring IC 84 executes an operation instruction to the power supply control IC 95 (S35), and does not execute an operation instruction to the power supply control IC 95 for the second time and thereafter. Thereby, when the front cover 2a is opened from the second time onward, the CPU 81 is not operated, and the power can be saved. Similarly, when the paper feed tray 11 is opened for the second time or later, it is possible to save power by not executing an operation instruction to the power supply control IC 95.

  In response to detecting that the front cover 2a is opened (S7: YES), the elapsed time from when the high-voltage power supply 91 is switched to the operating state until the front cover 2a is closed is less than a predetermined time. In the case (S41: NO), the cover history is not stored in the second register 87. If the elapsed time is less than the predetermined time, it is determined that the process cartridge 30 has not been replaced, and therefore it is determined that there is no need to rotate the cartridge. Unnecessary glass turning can be omitted, and toner deterioration due to glass turning can be suppressed. Similarly, when the elapsed time until the paper feed tray 11 is closed is less than the predetermined time, the toner deterioration can be suppressed by omitting the rotation.

  Next, the circuit configuration of the power supply unit 90, the control unit 80, the power switch SW1, the cover switch SW4, and the tray switch SW5 according to the third embodiment will be described with reference to FIG. In addition, the same code | symbol is attached | subjected about the structure same as 1st Embodiment, and detailed description is abbreviate | omitted suitably.

  In the third embodiment, a cover switch SW4 is provided instead of the cover switch SW2 according to the first embodiment. Further, a tray switch SW5 is provided instead of the tray switch SW3 according to the first embodiment. The cover switch SW4 is opened when the front cover 2a is closed, and the cover switch SW4 is closed when the front cover 2a is open. The tray switch SW5 is opened when the paper feed tray 11 is closed, and the tray switch SW5 is closed when the paper feed tray 11 is open. Moreover, it replaces with resistance R1 and R2 which concern on 1st Embodiment, and has resistance R4 and R5. The resistor R4 is connected between the cathode of the diode D1 and the port P4. The resistor R5 is connected between the cathode of the diode D1 and the port P5.

  Next, a method for detecting the opening of the front cover 2a and the paper feed tray 11 in the normal mode and the OFF mode will be described.

  In the normal mode, the power supply voltage V2 is supplied to the CPU 81 and the source terminals of the transistors Q1 and Q2. Since the ground voltage is applied to the gate terminals of the transistors Q1 and Q2 while the front cover 2a is open, the transistors Q1 and Q2 are turned on, and the cover open / close signal Sig1 and the tray open / close signal Sig2 are output from the drain terminals, respectively. Is done. On the other hand, since the smoothing voltage V4 is applied to the gate terminals of the transistors Q1 and Q2 while the front cover 2a is closed, the transistors Q1 and Q2 are turned off, and the cover opening / closing signal Sig1 and the tray opening / closing signal Sig2 from the drain terminal. Is not output. In the OFF mode, as in the first embodiment, the cover open / close signal Sig1 and the tray open / close signal Sig2 are not output from the drain terminal. As in the first embodiment, even in the OFF mode, the monitoring IC 84 can detect that the printer power switch 71 is turned on and that the front cover 2a and the paper feed tray 11 are opened.

  Subsequently, a case where the supply of the AC voltage Vac is stopped will be described. The monitoring IC 84 can continue to operate during the period when the power stored in the capacitor C1 is supplied. Furthermore, since the smooth voltage V4 is supplied to the ports P4 and P5, it can be detected whether or not the front cover 2a and the paper feed tray 11 are opened. That is, even after the supply of the AC voltage Vac is stopped, the monitoring IC 84 can continue to monitor the front cover 2a and the paper feed tray 11 during the period in which the power stored in the capacitor C1 is supplied. When the charge of the capacitor C1 is exhausted and when the supply of the AC voltage Vac is resumed, the monitoring IC 84 is reset after the CPU 81 is activated. Also, when reset, the monitoring IC 84 notifies the CPU 81 that it has been reset.

  In the third embodiment, the determination is made according to the table 2 shown in FIG. Table 2 is a table showing the correspondence between the values of the first register 86, the second register 87, and the third register 88, the combination of presence / absence of reset of the monitoring IC 84, and the presence / absence of rotation.

  When the monitoring IC 84 is reset (No. 1 and No. 6), it is unclear whether or not the front cover 2a and the paper feed tray 11 have been opened, so that the glass is rotated. The case where the monitoring IC 84 is reset is because the power supply by the capacitor C1 is stopped and the information stored in the second register 87 and the third register 88 is lost. The case of No. 6 is a case where the supply of the AC voltage Vac is resumed while the printer power switch 71 is turned on. When the monitoring IC 84 is not reset (No 2 to 5, 7 to 10), the rotation is executed according to the values of the second register 87 and the third register 88 regardless of the value of the first register 86. Determine whether or not. The case where the monitoring IC 84 is not reset is because the power supply by the AC voltage Vac or the capacitor C1 is continued and the monitoring of the front cover 2a and the paper feed tray 11 by the monitoring IC 84 is continued. When the values of the second register 87 and the third register 88 are both 0 (No. 2 and 7), the front cover 2a and the paper feed tray are not opened, so that the glass turning is omitted. On the other hand, when the value of at least one of the second register 87 and the third register 88 is 1 (No. 3 to 5, 8 to 10), since at least one of the front cover 2a and the paper feed tray is opened, the glass is turned. Execute.

  Here, the cover switch SW4 and the tray switch SW5 are examples of detection switches. Further, the circuit constituted by the cover switch SW4 and the resistor R4, and the circuit constituted by the tray switch SW5 and the resistor R5 are examples of the detection circuit. The glass turning (S27) executed according to the conditions No. 1 and No. 6 in Table 2 is an example of a fourth activation process.

  As described above, according to the above-described third embodiment, the following effects can be obtained.

  When the front cover 2a and the paper feed tray 11 are open in the operating state of the high voltage power supply unit 91, the cover switch SW2 and the tray switch SW3 are closed, and a ground voltage is applied to the gate terminals of the transistors Q1 and Q2. Thus, the transistors Q1 and Q2 output a cover open / close signal Sig1 and a tray open / close signal Sig2, respectively. As a result, the CPU 81 is notified that the front cover 2a and the paper feed tray 11 have been opened. Even when the supply of the AC voltage Vac is stopped, as long as power is supplied from the capacitor C1, power is supplied to the monitoring IC 84 and the ports P4 and P5 by the capacitor C1, so the monitoring IC 84 continues to operate, The cover 2a and the paper feed tray 11 can be monitored.

  In step S25 of the glass turning process, the CPU 81 makes a determination according to Table 2 (FIG. 9). When the monitoring IC 84 is reset (No. 1 and 6), the glass turning is executed. The case where the monitoring IC 84 is reset is when the power supply of the AC voltage Vac or the power supply by the capacitor C1 is stopped and the information stored in the second register 87 and the third register 88 by the monitoring IC 84 is lost. is there. In this case, since it is unclear whether or not the front cover 2a and the paper feed tray 11 are opened, the glass is turned. As a result, it is possible to carry out the necessary glass turning when the front cover 2a and the paper feed tray 11 are opened.

Needless to say, the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the spirit of the present invention.
For example, in the embodiment, the laser printer 1 has been described as an example, but the present invention is not limited to this. It may be a so-called multifunction machine having a scanner function, a copy function, a facsimile function, and the like.

  Moreover, although embodiment demonstrated the case where the control part 80 was provided with CPU81 as an example, it is not limited to this. A plurality of CPUs may be provided, or an ASIC may be used. Furthermore, it may be configured by a combination of the CPU 81 and the ASIC.

  Further, when the high voltage power supply unit 91 starts from the state in which the generation of the power supply voltage V1 is stopped, the power supply of the AC voltage Vac is resumed when the user turns on the printer power switch 71 in the OFF mode. I explained that there was a case. In addition to this, for example, there is a timer return that returns to the normal mode when a predetermined time elapses after shifting to the OFF mode. In the case of a timer return, for example, a process of updating the value of the first register 86 to 1 in response to the return may be executed. Thereby, it is possible to specify whether or not the supply of the AC voltage Vac is stopped according to the value of the first register 86.

  In addition, the terminal that is not connected to the port P4 among the terminals of the resistor R1 is connected to the smoothing voltage V3, and the terminal that is not connected to the port P4 among the terminals of the cover switch SW2 is connected to the ground voltage. However, the present invention is not limited to this. Of the terminals of the resistor R1, the terminal not connected to the port P4 may be connected to the ground voltage, and the terminal of the cover switch SW2 that is not connected to the port P4 may be connected to the smoothing voltage V3. . Even in this configuration, it is possible to detect the opening of the front cover 2a. That is, since the smooth voltage V3 is applied to the gate terminal of the transistor Q1 while the front cover 2a is closed, the transistor Q1 is turned off and the cover open / close signal Sig1 is not output from the drain terminal. On the other hand, since the ground voltage is applied to the gate terminal of the transistor Q1 via the resistor R1 while the front cover 2a is open, the transistor Q1 is turned on and the cover open / close signal Sig1 is output from the drain terminal. The resistors R2, R4, R5, the cover switch SW4, and the tray switches SW3 and SW5 may have the same configuration.

DESCRIPTION OF SYMBOLS 1 Laser printer 2a Front cover 11 Paper feed tray 71 Printer power switch 81 CPU
84 Monitoring IC
91 High Voltage Power Supply Unit 93 Small Capacity Power Supply Unit 94 Voltage Limiting Circuit V1, V2 Power Supply Voltage V3, V4 Smoothing Voltage Vac AC Voltage SW1 Power Switch SW2, SW4 Cover Switch SW3, SW5 Tray Switch R1, R2, R3, R4, R5 Resistor Q1 Q2 Transistor D1 Diodes P1, P2, P3, P4, P5 Port Sig1 Cover open / close signal Sig2 Tray open / close signal

Claims (15)

An image forming apparatus comprising a housing cover and a power switch,
A power supply unit capable of switching between an operation state for outputting a control system power supply voltage and a stop state for stopping the output of the control system power supply voltage;
A small-capacity power supply unit that has a power supply capacity smaller than the power supply unit and outputs a smoothed voltage by smoothing a commercial AC voltage;
A control unit to which the control system power supply voltage is fed;
A monitoring unit to which the smoothed voltage is supplied,
In the stopped state of the power supply unit, the monitoring unit,
A first detection process for detecting that the housing cover is opened;
A first storage process for storing a detection result in the first detection process;
A second detection process for detecting that the power switch is operated;
Executing a first activation command process that commands the power supply unit to switch from the stop state to the operation state in response to detection of power-on by the second detection process;
The controller is
In response to the power supply unit being switched to the operation state, the detection result stored by the first storage process is acquired from the monitoring unit, and the detection result indicates that the housing cover has been opened. A first activation process in which a preparatory operation is performed, and when the case cover is not opened, the preparatory operation is not performed .
A setting process for setting a direct switching mode for instructing the power supply unit to switch to the operation state subsequent to the first detection process for the monitoring unit, and
The monitoring unit
A second storage process for storing the direct switching mode according to the setting process;
In response to the direct switching mode being stored by the second storage process, executing a first stop command process for commanding the power supply unit to switch to the stop state,
When the direct switching mode is stored by the second storage process,
The monitoring unit executes a second activation command process that commands the power supply unit to switch to the operation state in response to the detection by the first detection process,
The controller is
After the power supply unit is switched to the operation state by the second activation command process,
On the condition that the monitoring unit has executed the first detection process, execute a storage command process to instruct the monitoring unit to execute the first storage process,
The monitoring unit
An image forming apparatus that executes second stop command processing for commanding the power supply unit to switch to the stop state upon completion of the first storage processing . The monitoring unit, when the direct switching mode is stored by the second storage process,
Performing a counting process for counting the number of times of detection by the first detection process;
The image forming apparatus according to claim 1 , wherein the second activation command process is executed when the number of detections counted by the counting process is one. The controller is
Executing a timing process for measuring the time from when the power supply unit is switched to the operating state by the second activation command process until the housing cover is closed;
The image forming apparatus according to claim 1 , wherein the storage command process is executed when a time measured by the timing process is a predetermined time or more. An image forming apparatus comprising a housing cover and a power switch,
A power supply unit capable of switching between an operation state for outputting a control system power supply voltage and a stop state for stopping the output of the control system power supply voltage;
A small-capacity power supply unit that has a power supply capacity smaller than the power supply unit and outputs a smoothed voltage by smoothing a commercial AC voltage;
A control unit to which the control system power supply voltage is fed;
A monitoring unit to which the smoothed voltage is supplied,
In the stopped state of the power supply unit, the monitoring unit,
A first detection process for detecting that the housing cover is opened;
A first storage process for storing a detection result in the first detection process;
A second detection process for detecting that the power switch is operated;
Executing a first activation command process that commands the power supply unit to switch from the stop state to the operation state in response to detection of power-on by the second detection process;
The controller is
In response to the power supply unit being switched to the operation state, the detection result stored by the first storage process is acquired from the monitoring unit, and the detection result indicates that the housing cover has been opened. When performing a preparatory operation, and when indicating that the housing cover is not opened, execute a first activation process that does not perform the preparatory operation,
The monitoring unit includes a detection terminal that detects that the housing cover is opened,
A detection switch that is turned on and off according to opening and closing of the housing cover and a resistor are connected in series. A detection circuit in which the measured voltage is fed and a ground terminal is connected to the other end;
A switch circuit for switching whether to generate an open / close signal from the control system power supply voltage for notifying the controller of opening / closing of the housing cover according to the state of the detection terminal;
Images forming device you comprising: a. The small-capacity power supply unit is
A rectifier that rectifies the commercial AC voltage and outputs a primary smoothed voltage;
A capacitor that outputs a secondary smoothed voltage obtained by further smoothing the primary smoothed voltage;
A rectifying element interposed in the path from the rectifying unit toward the capacitor as a forward direction, and
The primary smoothing voltage is fed to the detection circuit, and the secondary smoothing voltage is fed to the monitoring unit;
The image forming apparatus according to claim 4 , wherein the detection switch is turned on when the housing cover is closed. The small-capacity power supply unit is
A rectifier that rectifies the commercial AC voltage and outputs a primary smoothed voltage;
A capacitor that outputs a secondary smoothed voltage obtained by further smoothing the primary smoothed voltage;
A rectifying element interposed in the path from the rectifying unit toward the capacitor as a forward direction, and
The secondary smoothed voltage is fed to the detection circuit and the monitoring unit,
The image forming apparatus according to claim 4 , wherein the detection switch is turned off when the housing cover is closed. The switch circuit includes a PMOS transistor,
The PMOS and the control system power supply voltage to the source terminal of the transistor is powered, the gate terminal connected to said detection terminal, any one of claims 4 to 6 and outputs the switching signal from the drain terminal The image forming apparatus described in 1. The controller is
The preparatory operation when the detection result of the first detection process by the first storage process is not stored and the detection by the second detection process is not performed in response to the rise of the control system power supply voltage the image forming apparatus according to any one of claims 1 to 7, characterized in that to perform a third activation processing performed. An image forming apparatus comprising a housing cover and a power switch,
A power supply unit capable of switching between an operation state for outputting a control system power supply voltage and a stop state for stopping the output of the control system power supply voltage;
A small-capacity power supply unit that has a power supply capacity smaller than the power supply unit and outputs a smoothed voltage by smoothing a commercial AC voltage;
A control unit to which the control system power supply voltage is fed;
A monitoring unit to which the smoothed voltage is supplied,
In the stopped state of the power supply unit, the monitoring unit,
A first detection process for detecting that the housing cover is opened;
A first storage process for storing a detection result in the first detection process;
A second detection process for detecting that the power switch is operated;
Executing a first activation command process that commands the power supply unit to switch from the stop state to the operation state in response to detection of power-on by the second detection process;
The controller is
In response to the power supply unit being switched to the operation state, the detection result stored by the first storage process is acquired from the monitoring unit, and the detection result indicates that the housing cover has been opened. When performing a preparatory operation, and when indicating that the housing cover is not opened, execute a first activation process that does not perform the preparatory operation,
The monitoring unit
Execute initialization notification processing to notify that initialization has been performed,
The controller is
The control system power supply voltage in response to a rising edge of, if it is the notification by the initialization notification process, the preparatory operation fourth activation process images forming device characterized in that the execution be performed. A power supply unit capable of switching between a casing cover, a power switch, an operation state for outputting a control system power supply voltage, and a stop state for stopping the output of the control system power supply voltage, and a power supply capacity smaller than that of the power supply unit An image comprising: a small-capacity power supply unit that outputs a smoothed voltage by smoothing a commercial AC voltage; a control unit that is supplied with the control system power supply voltage; and a monitoring unit that is supplied with the smoothed voltage. A method for controlling a forming apparatus, comprising:
A first detection step of detecting that the housing cover is opened in the stopped state of the power supply unit;
A first storage step for storing a detection result in the first detection step ;
A second detection Chis step for detecting that said power switch is operated,
A first activation command step for commanding the power supply unit to switch from the stop state to the operation state in response to the power-on being detected by the second detection step ;
In response to the power supply unit being switched to the operating state, the detection result stored in the first storage step is acquired from the monitoring unit, and the detection result indicates that the housing cover has been opened. A first activation step in which a preparatory operation is performed, and in a case where the case cover is not opened, the preparatory operation is not performed.
A setting step for setting a direct switching mode for instructing the power supply unit to switch to the operating state following the first detection step for the monitoring unit;
A second storage step for storing the direct switching mode according to the setting step;
A first stop command step for commanding the power supply unit to switch to the stop state in response to the direct switching mode being stored by the second storage step;
When the direct switching mode is stored in the second storage step,
A second activation command step for commanding the power supply unit to switch to the operating state in response to detection by the first detection step;
After the power supply unit is switched to the operation state by the second activation command step,
A storage command step for instructing the monitoring unit to execute the first storage step on condition that the monitoring unit has executed the first detection step;
A second stop command step for commanding the power supply unit to switch to the stop state upon completion of the first storage step;
A control method for an image forming apparatus. A power supply unit capable of switching between a casing cover, a power switch, an operation state for outputting a control system power supply voltage, and a stop state for stopping the output of the control system power supply voltage, and a power supply capacity smaller than that of the power supply unit An image comprising: a small-capacity power supply unit that outputs a smoothed voltage by smoothing a commercial AC voltage; a control unit that is supplied with the control system power supply voltage; and a monitoring unit that is supplied with the smoothed voltage. A program for controlling a forming apparatus,
In the image forming apparatus,
A first detection process for detecting that the housing cover is opened in the stopped state of the power supply unit;
A first storage process for storing a detection result in the first detection process;
A second detection intellectual processing that detects that the power switch is operated,
A first activation command process for commanding the power supply unit to switch from the stop state to the operation state in response to the power-on being detected by the second detection process;
In response to the power supply unit being switched to the operation state, the detection result stored by the first storage process is acquired from the monitoring unit, and the detection result indicates that the housing cover has been opened. A first activation process in which a preparatory operation is performed, and when the case cover is not opened, the preparatory operation is not performed.
A setting process for setting a direct switching mode instructing the power supply unit to switch to the operation state subsequent to the first detection process for the monitoring unit;
A second storage process for storing the direct switching mode according to the setting process;
A first stop command process for instructing the power supply unit to switch to the stop state in response to the direct switching mode being stored by the second storage process;
When the direct switching mode is stored by the second storage process,
A second activation command process for commanding the power supply unit to switch to the operating state in response to detection by the first detection process;
After the power supply unit is switched to the operation state by the second activation command process,
A storage command process for instructing the monitoring unit to execute the first storage process on condition that the monitoring unit has executed the first detection process;
With the completion of the first storage process, a second stop command process for commanding the power supply unit to switch to the stop state;
A program characterized by having executed. A power supply unit capable of switching between a casing cover, a power switch, an operation state for outputting a control system power supply voltage, and a stop state for stopping the output of the control system power supply voltage, and a power supply capacity smaller than that of the power supply unit A small-capacity power supply unit that outputs a smoothed voltage by smoothing a commercial AC voltage, a control unit that is fed with the control system power supply voltage, and a monitoring unit that is supplied with the smoothed voltage,
The monitoring unit includes a detection terminal that detects that the housing cover is opened,
A detection switch that is turned on and off according to the opening and closing of the housing cover and a resistor are connected in series. A contact point between the detection switch and the resistor is connected to the detection terminal, and the smoothing is provided at one end that is not a contact point between the detection switch and the resistor. A detection circuit in which the measured voltage is fed and a ground terminal is connected to the other end;
A control circuit for an image forming apparatus, comprising: a switch circuit that switches whether to generate an open / close signal for notifying the controller of opening / closing of the housing cover based on the state of the detection terminal. Because
A first detection step of detecting that the housing cover is opened in the stopped state of the power supply unit;
A first storage step for storing a detection result in the first detection step;
A second detection step of detecting that the power switch is operated;
A first activation command step for commanding the power supply unit to switch from the stop state to the operation state in response to the power-on being detected by the second detection step;
In response to the power supply unit being switched to the operating state, the detection result stored in the first storage step is acquired from the monitoring unit, and the detection result indicates that the housing cover has been opened. A first activation step in which a preparatory operation is performed, and in a case where the case cover is not opened, the preparatory operation is not performed.
A control method for an image forming apparatus. A power supply unit capable of switching between a casing cover, a power switch, an operation state for outputting a control system power supply voltage, and a stop state for stopping the output of the control system power supply voltage, and a power supply capacity smaller than that of the power supply unit A small-capacity power supply unit that outputs a smoothed voltage by smoothing a commercial AC voltage, a control unit that is fed with the control system power supply voltage, and a monitoring unit that is supplied with the smoothed voltage,
The monitoring unit includes a detection terminal that detects that the housing cover is opened,
A detection switch that is turned on and off according to the opening and closing of the housing cover and a resistor are connected in series. A contact point between the detection switch and the resistor is connected to the detection terminal, and the smoothing is provided at one end that is not a contact point between the detection switch and the resistor. A detection circuit in which the measured voltage is fed and a ground terminal is connected to the other end;
Controlling an image forming apparatus comprising: a switch circuit that switches whether to generate an open / close signal from the control system power supply voltage for notifying the controller of opening / closing of the housing cover according to the state of the detection terminal. A program,
In the image forming apparatus,
A first detection process for detecting that the housing cover is opened in the stopped state of the power supply unit;
A first storage process for storing a detection result in the first detection process;
A second detection process for detecting that the power switch is operated;
A first activation command process for commanding the power supply unit to switch from the stop state to the operation state in response to the power-on being detected by the second detection process;
In response to the power supply unit being switched to the operation state, the detection result stored by the first storage process is acquired from the monitoring unit, and the detection result indicates that the housing cover has been opened. A first activation process in which a preparatory operation is performed, and when the case cover is not opened, the preparatory operation is not performed.
A program characterized by having executed. A power supply unit capable of switching between a casing cover, a power switch, an operation state for outputting a control system power supply voltage, and a stop state for stopping the output of the control system power supply voltage, and a power supply capacity smaller than that of the power supply unit An image comprising: a small-capacity power supply unit that outputs a smoothed voltage by smoothing a commercial AC voltage; a control unit that is supplied with the control system power supply voltage; and a monitoring unit that is supplied with the smoothed voltage. A method for controlling a forming apparatus, comprising:
A first detection step of detecting that the housing cover is opened in the stopped state of the power supply unit;
A first storage step for storing a detection result in the first detection step;
A second detection step of detecting that the power switch is operated;
A first activation command step for commanding the power supply unit to switch from the stop state to the operation state in response to the power-on being detected by the second detection step;
In response to the power supply unit being switched to the operating state, the detection result stored in the first storage step is acquired from the monitoring unit, and the detection result indicates that the housing cover has been opened. A first activation step in which a preparatory operation is performed, and in a case where the case cover is not opened, the preparatory operation is not performed.
An initialization notification step for notifying that the monitoring unit has been initialized;
A fourth activation step for performing the preparatory operation when the notification by the initialization notification step is performed in response to the rise of the control system power supply voltage;
A control method for an image forming apparatus. A power supply unit capable of switching between a casing cover, a power switch, an operation state for outputting a control system power supply voltage, and a stop state for stopping the output of the control system power supply voltage, and a power supply capacity smaller than that of the power supply unit An image comprising: a small-capacity power supply unit that outputs a smoothed voltage by smoothing a commercial AC voltage; a control unit that is supplied with the control system power supply voltage; and a monitoring unit that is supplied with the smoothed voltage. A program for controlling a forming apparatus,
In the image forming apparatus,
A first detection process for detecting that the housing cover is opened in the stopped state of the power supply unit;
A first storage process for storing a detection result in the first detection process;
A second detection process for detecting that the power switch is operated;
A first activation command process for commanding the power supply unit to switch from the stop state to the operation state in response to the power-on being detected by the second detection process;
In response to the power supply unit being switched to the operation state, the detection result stored by the first storage process is acquired from the monitoring unit, and the detection result indicates that the housing cover has been opened. A first activation process in which a preparatory operation is performed, and when the case cover is not opened, the preparatory operation is not performed.
An initialization notification process for notifying that the monitoring unit has been initialized;
In response to a rise of the control system power supply voltage, when the notification by the initialization notification process has been made, a fourth activation process for performing the preparatory operation;
A program characterized by having executed.

Images