JP3740182B2 - Power shut-off device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to energy saving of an image forming apparatus, and more particularly to shutting off a power source of the image forming apparatus.
[0002]
[Prior art]
Conventionally, in order to save energy in an image forming apparatus, auto shut-off has been performed as a method of shutting down a power source. FIG. 2 is a diagram showing a conventional example, and the main switch 1001 is cut off by the control circuit 1004.
[0003]
[Problems to be solved by the invention]
However, when the apparatus becomes large and power consumption increases, it is necessary to gradually cool the apparatus even after the main switch is turned off. For this reason, conventionally, the power source required for in-machine cooling has not been cut off.
The present invention has been made in view of such problems, and the object of the present invention is to further save energy even in a device that is large in size and consumes a large amount of power, and that requires internal cooling after turning off the main switch. An object is to provide a power shut-off device that can perform the above.
[0004]
[Means for Solving the Problems]
  In order to achieve the above object, the first aspect of the present invention is a power shut-off device that switches between an ON state and an OFF state of an AC power source to be supplied to a device that is supplied with an AC power source. And a second switching means for switching between an AC power supply path from before the first switching means and an AC power supply path after the first switching means, and a control power supply that receives the output of the second switching means. ,at leastWhen the device is not used for a first predetermined timeSwitching the first switching means from an ON state to an OFF state, and driving control of the second switching meansTo doIncludingOnlyA control means for performing a shut-off operation of the power supplied to the device; a state detection means for detecting an ON state or an OFF state of the first switching means;Storage means for storing the state of the second switching means;The control means comprises the state detection meansThat the first switching means is in the ON state.DetectedlaterThe second switching meansIn the AC power supply path from the frontswitchingThe second switching means is connected to the subsequent AC power supply path based on the fact that a second predetermined time has elapsed after the state detecting means detects that the first switching means has been turned off. And when the power supplied to the control means is not shut off within a third predetermined time after the second switching means is switched to the AC power supply path after the second switching means. The first failure detection function for determining that the switching means is faulty, and when the first switching means is in an ON state and AC power is supplied, the contents stored in the storage means are A second failure detection function that indicates that the state detection unit is in failure when the state detection unit detects an OFF state,When the device is not used for the first predetermined time, the first switching unit is turned off, and the second switching unit is turned on after the state detecting unit detects the ON state. A third failure detection function for determining that the first switching means has failed when the power supplied to the control means does not turn off after a fourth predetermined time has elapsed. ,HaveIt is characterized by that.
[0012]
  Claim2The invention of claim1In the power shutoff device described in,in frontWhen the first switching means is in an ON state and AC power is supplied, the storage means is read out, and the read contents are read by the second switching means.laterofAC power supplyWhen the route is not indicated, it is determined that the second switching means is out of order.Has a fourth failure detection functionIt is characterized by that.
[0013]
  Claim3The invention of claim2In the power shut-off device described in 1.The storage means can record failure information of the second switching means,The control means stores failure information of the second switching means when the state detecting means detects an OFF state of the first switching means, and the second switching meansAC power supply path afterWhen switched toOf the second switching meansThe failure information is erased.
[0014]
  Claim4The invention of claim3In the power shut-off device according to claim 1, the control means is configured such that when the first switching means is in an ON state and AC power is supplied.Of the second switching meansWhen failure information is recorded, it is determined that the second switching means is broken.Has a fourth failure detection functionIt is characterized by that.
[0015]
  Claim5The invention described in claim1In the power shut-off device described above, the control means is,When the first switching means is in an ON state and AC power is supplied, the content stored in the storage means indicates a later AC power supply path, and the state detection means detects an OFF state To determine that the state detecting means is out of order.Has a fifth failure detection functionIt is characterized by that.
[0018]
  Claim6The invention described in claim1In the power shut-off device described inThe storage means can record failure information of the state detection means,The control means generates the switching signal to turn off the first switching means, and the state detecting meansONWhen the state is detected, the second switching means is connected to the ACPower supplySwitch to the supply path, record the failure information of the state detection means in the storage means, and thenThe fourth predeterminedAfter hoursAnd the electric power supplied to the control means.If the source does not fallErase information on failure of the state detection means stored in the storage meansIt is characterized by that.
[0025]
  Claim7The invention described inAn image forming apparatus,From claim 16The power cutoff device according to any one of the above is provided.
[0026]
[Action]
According to the present invention, the apparatus includes the first switching means for turning on / off the AC power supply, the first switching means, and the second switching means for switching the AC supply from before and after the first switching means. Even in a large-sized apparatus that consumes a large amount of power and requires internal cooling after the main switch is turned off, further energy saving can be achieved.
[0027]
Furthermore, even in a device to which a FAX function is added, after the main switch is turned OFF, it is possible to keep the power supply necessary for FAX reception standby for a predetermined time and to shut off the power after the predetermined time has elapsed, thereby saving energy. Can do.
[0028]
According to the above configuration, when the second switching means sticks to the AC switching path on the front side of the main switch, it is impossible to cut off all power supply and obtain the expected energy saving effect. I can't. Further, when the second switching means sticks to the rear side of the main switch, all AC supply is turned off in synchronization with the main switch, and processing such as in-machine cooling necessary for the apparatus cannot be performed. Moreover, regarding these failures, it is considered that the user is often unaware of the failure because no abnormality is caused in the normal operation except that the energy saving operation or the processing necessary for the apparatus shutdown is not performed.
[0029]
However, according to the present invention, it is possible to reliably detect the failure by providing the failure detection means of the second switching means of the AC power supply path.
[0030]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0031]
(Configuration common to each embodiment)
FIG. 3 is a sectional view showing an example of the image forming apparatus of the present invention.
[0032]
In FIG. 3, reference numeral 100 denotes a copying machine main body, 200 denotes a circulating automatic document feeder or feeder (RDF) for automatically feeding a document, 250 denotes a sorting device or sorter, and these RDF 200 and sorter 250 are connected to the main body 100. Can be used in any combinationCanThe
[0033]
In FIG. 3, reference numeral 101 denotes an original table glass as an original table. Reference numeral 102 denotes an optical system as an image reading means, which includes a document illumination lamp (exposure lamp) 103, a scanning mirror, a lens 143, a motor 104, and the like. The exposure lamp 103 is scanned while being scanned by the motor 104. Then, the original is illuminated, and the photosensitive drum 105 is irradiated with reflected light from the original by a scanning mirror and a lens.
[0034]
Around the photosensitive drum 105, a primary charger 106, a blank exposure unit 107, a potential sensor 108, a developing device 109, a transfer charger 110, a separation charger 111, and a cleaning device 112 are provided. In addition, the image recording means is constituted by the photosensitive drum 105 and the like.
[0035]
The photosensitive drum 105 is rotated in the direction of the arrow shown in FIG. 3 by the main motor 113 and is corona charged by the primary charger 106. When the reflected light of the original is irradiated from the optical system 102, the photosensitive drum 105 A latent image is formed. This electrostatic latent image is developed by the developing device 109 and visualized as a toner image. On the other hand, the transfer paper fed into the main body 100 by the paper feed rollers 118 and 119 from the upper cassette 114 or the lower cassette 115 via the pickup rollers 116 and 117 is transferred to the leading edge of the toner image and the leading edge of the transfer paper by the registration rollers 120. After the timing is reached, the toner is fed to the photosensitive drum 105 and the toner image is transferred by the transfer charger 110. After the transfer, the transfer paper is separated from the photosensitive drum 106 by the separation charger 111, guided to the fixing device 122 by the transfer belt 121, and fixed by pressure and heating. Discharged. Further, the surface of the photosensitive drum 105 is cleaned by the cleaning device 112.
[0036]
The main body 100 is equipped with a deck 124 that can store, for example, 4000 transfer sheets. The lifter 125 of the deck 124 rises according to the amount of transfer paper so that the transfer paper always contacts the paper feed roller 126. In FIG. 3, reference numeral 127 denotes a paper discharge flapper that cuts the path between the duplex recording side or the multiple recording side and the discharge side (sorter 250).ChangeYeah. The transfer paper fed from the discharge roller 123 is cut by the paper discharge flapper 127 to the double-sided recording side or the multiple recording side.Changeavailable. Reference numeral 128 denotes a lower conveyance path. The transfer sheet sent out from the discharge roller 123 is turned over through the reverse path 129 and guided to the refeed tray 130. 131 also cuts the path between double-sided recording and multiple recording.ChangeMulti flapper that can be moved to the leftthingAs a result, the transfer sheet is directly guided to the lower conveyance path 128 without passing through the reverse path 129. 132 is,This is a paper feed roller for feeding transfer paper to the photosensitive drum 105 side through a path 133. 134 is,It is arranged in the vicinity of the paper discharge flapper 127 and is cut to the discharge side by the paper discharge flapper 127.ChangeA discharge roller for discharging the obtained transfer paper to the outside of the apparatus.
[0037]
During double-sided recording (double-sided copying) or multiple recording (multiple copying), the paper discharge flapper 127 is raised upward and the copied transfer paper is stored in the refeed tray 130 in an inverted state via the conveyance paths 128 and 129. To do. At this time, the multiple flapper 131 is tilted to the right during duplex recording, and the multiple flapper 131 is tilted to the left during multiple recording. At the time of backside recording or multiplex recording to be performed next, the transfer sheets stored in the refeed tray 130 are guided to the registration roller 120 of the main body via the path 133 by the sheet feed roller 132 from the bottom one by one. When the transfer paper is reversed and discharged from the main body, the paper discharge flapper 127 is raised upward, the flapper 131 is tilted to the right, and the copied transfer paper is conveyed to the conveyance path 129 side. After passing through one feed roller 140, the sheet is conveyed to the second feed roller side by the reverse roller 142, and the transfer paper is turned over by the discharge roller 134 and discharged outside the apparatus.
[0038]
FIG. 4 is a block diagram showing an example of a control system of the image forming apparatus of the present invention. In this figure, reference numeral 1004 denotes a control circuit (controller), which comprises a CPU 1004a, a ROM 1004b, a RAM 1004c, and the like, and controls the copy sequence based on a program stored in the ROM 1004b.
[0039]
The operation unit 600 includes a copy mode (single-sided / double-sided / multiple mode, copy magnification, cassette selection, etc.) setting key, a numeric keypad for setting the number of copies, a start key for instructing start of copying operation, and a stop for instructing stop of copying operation. A key input unit such as a key, a reset key for returning the operation mode to the standard state, and a display unit such as an LED / liquid crystal for displaying the setting state of the operation mode are arranged.
[0040]
The thermistor 302 detects the surface temperature of the fixing roller 144, and the value A / D converted in 301 is input to the controller 1004. The controller 1004 controls the surface temperature of the fixing roller 144 to be a predetermined value based on the detection value of the thermistor 302.
[0041]
The high voltage control unit 303 controls the charging system such as the primary charger 106 and the transfer charger 110, and the high voltage unit 304 that applies a predetermined potential to the developing device 109 and the like.
[0042]
The motor control unit 305 controls driving of a motor 306 such as various stepping motors and main drive motors.
[0043]
The DC load control unit 307 controls driving of a solenoid for the pickup roller 116, a clutch for the registration roller 120, a fan, and the like.
[0044]
Reference numeral 308 denotes sensors for detecting a paper jam of the transfer paper, and is input to the controller 1004.
[0045]
The AC driver 1000 controls the AC power supply to the AC load 310 such as the document illumination lamp 103 and the fixing heater 311. Also, abnormalities of the document illumination lamp 103, the fixing heater 311 and the like are detected, and the main switch 1001 with a shut-off function is turned off. Further, the AC input before and after the main switch 1001 is switched under the control of the controller 1004 and input to the power source 1100.
[0046]
The power source 1100 supplies DC power to the controller 1004 and the like, and AC power from the AC driver 1000 is input, and AC power from the input power plug 311 is input to the power source 1100 via the main switch 1001 and the door switch 1007. Is done.
[0047]
A paper deck 124 is a paper feeding device for increasing the number of transfer papers stacked, a feeder 200 is an automatic document feeder for automatically setting a plurality of originals, and a sorter 250 is for sorting transfer papers to be discharged. It is a sorting device for this.
[0048]
FIG. 5 shows an arrangement configuration example of the operation unit 600.
[0049]
In FIG. 5, reference numeral 601 denotes an asterisk (*) key, which is used in a setting mode such as setting of a binding margin amount or setting of size of a document frame eraser. A cursor key 627 is used to select a setting item in the setting mode. Reference numeral 628 denotes an OK key, which is used to confirm setting contents in the setting mode. Reference numeral 606 denotes an all reset key which is pressed when returning to the standard mode. The key 602 is also pressed when returning to the standard mode from the auto shut-off state. Reference numeral 605 denotes a copy start key (copy start key), which is pressed to start copying.
[0050]
A clear / stop key 604 has a clear key function during standby (standby) and a stop key function during copy recording. This clear key is also used to cancel the set number of copies. The stop key is pressed to interrupt continuous copying. After the copying at the time of pressing is completed, the copying operation is stopped. Reference numeral 603 denotes a numeric key, which is pressed when setting the number of copies. Also used to set * (asterisk) mode. Reference numeral 619 denotes a memory key, which is used to register a mode frequently used by a user.CanThe Here, registration of four modes M1 to M4CanThe
[0051]
Reference numerals 611 and 612 denote copy density keys which are pressed when the copy density is manually adjusted. Reference numeral 613 denotes an AE key which is pressed when the copy density is automatically adjusted according to the density of the original or when AE (automatic density adjustment) is canceled and density adjustment is switched to manual. Reference numeral 607 denotes a copy paper selection key, which is pressed to select the upper paper wrapper 119, the lower paper lifter 115, the paper deck 124, and the multi-manual feed 150. When a document is placed on the RDF 300, APS (automatic paper cassette selection) can be selected with this key 607. When APS is selected, a cassette having the same size as the original is automatically selected.
[0052]
Reference numeral 610 denotes an equal-magnification key which is pressed to make an equal-magnification (original size) copy. Reference numeral 616 denotes an auto scaling key which is pressed to automatically specify reduction / enlargement of an image of a document in accordance with a designated copy paper size. Reference numeral 626 denotes a double-sided key which is pressed when taking a double-sided copy from a single-sided original, a double-sided copy from a double-sided original, or a single-sided copy from a double-sided original. A binding margin key 625 is used to create a binding margin of a specified length on the left side of the transfer sheet.CanThe A photo key 624 is pressed when copying a photo original. Reference numeral 623 denotes a multiplex key which is pressed when an image is created (synthesized) from two originals on the same side of a transfer sheet.
[0053]
A document frame erase key 620 is pressed when the user erases a frame of a standard size document, and the size of the document is set with an asterisk key 601 at that time. Reference numeral 621 denotes a sheet frame erasing key which is pressed when erasing a document according to the copy paper size. Reference numeral 629 denotes a cover mode setting key, which is used when creating a front cover, a back cover, and inserting a slip sheet. A page continuous shooting key 630 is used when the left and right sides of a spread book are continuously copied. Reference numeral 614 denotes a paper discharge method selection key for selecting a staple sort, sort, and group discharge method. When a stapled sorter is connected to a sheet after recording, the staple sort mode, sort mode, group mode selection or The selection mode can be canceled.
[0054]
A reservation key 631 is used to start setting a copy mode for a reserved document placed on the reservation tray 210 and to cancel the reservation setting. A reservation setting key 632 is used as a confirmation key when setting a reservation mode. Reference numeral 633 denotes a guide key, which is used when a description of functions corresponding to various keys is displayed on a message display. Reference numeral 701 denotes an LCD (liquid crystal) type message display for displaying information relating to copying, which displays characters and figures with 96 × 192 dots. For example, the number of copies set with the numeric keypad 603, the standard magnification keys 608 and 609, the equal magnification key 610, the copy magnification set with the zoom keys 617 and 618, the paper size selected with the paper selection key 607, and the state of the copying apparatus main body 100 Message, a guide message indicating the operation procedure, and other mode setting contents are displayed.
[0055]
Reference numeral 704 denotes an AF display, which lights up when AE (automatic density adjustment) is selected by the AE key 613. Reference numeral 709 denotes a preheating indicator, which is lit when preheated. When the RDF 200 is used in the standard mode, the number of copies is set to one, the density AE mode, auto paper selection, same size, and single-sided copying from single-sided original. In the standard mode when the RDF 200 is not used, the number of copies is set to 1 and the density manual mode is set to the same size, single-sided original to single-sided copying. The difference between when the RDF 200 is used and when it is not used is determined by whether or not a document is set on the RDF 200.
[0056]
(Example 1)
FIG. 1 shows a configuration of a power supply unit according to the present invention. In the figure, reference numeral 1001 denotes a main switch which is a first switching means for turning on / off an AC power source, and reference numeral 1002 denotes a second switch for switching AC supply before and after the main SW A relay 1003 serving as switching means is a voltage detection unit that detects the state of the main SW and generates a detection signal in accordance with the detected state. In this embodiment, the voltage detection unit 1003 detects the switching state of the first switching means. 1004 is,This is a control circuit that controls switching of the relay 1002 in accordance with the state of the main SW 1001. Reference numeral 1100 denotes a power source, and there are roughly two systems. Reference numeral 1005 denotes a 5V system for driving a control system such as the control circuit 1004.And24VU power supply for driving latch solenoids, etc. 1006Is fine24VR for analog signals that require a high degree of power, and 38VU power supplies for main motors and optical motors. Reference numeral 1007 denotes a door switch.
[0057]
  Before SW1001 is turned on,relay1002 is the AC line on the rear side of SW 1001 (the right side of SW 1001 in FIG. 1).WhenPower supply circuit 1005ConnectHas been switched to. This route is called the A route. When the SW 1001 is turned on, the AC power is supplied to the power supply circuit 1005, and the voltage detection circuit 1003 outputs a signal indicating that the SW 1001 is turned on to the control unit 1004. When the power is supplied, the control unit 1004 starts the control operation of the power supply unit.
[0058]
  The control operation of the power supply unit will be described along the flowchart of FIG. When the operation starts in the control unit 1004, first, the route ATo keep the relay1002Shut off the power to(S2001). In order to quickly eliminate the influence of an indefinite time such as a reset, the SW 1002 is switched simultaneously with the start of operation. Next, it is confirmed that the SW 1001 is turned on (S2002). When the SW 1001 is not ON, error processing is performed as a failure of the voltage detection unit 1003 or the SW 1001 (S2011). When SE1001 is ON, the relay 1002 is switched to supply power to the power supply circuit 1005 from the AC line on the front side of SW1001 (left side of SW1001 in FIG. 1) (S2003). Hereinafter, this route is referred to as a B route. Next, the system is initialized, including system operation confirmation and processing for stabilizing the system (S2004). When initialization is completed (S2005), the normal operation mode is entered and system processing is performed (S2006). System processing (normal operation) (S2006) is continued until SW1001 is turned off. When the SW 1001 is turned off, processing for terminating the system is performed (S2008). When the processing is completed (S2009), the relay 1002 is switched so as to be route A (S2011), and the system operation is stopped.
[0059]
FIG. 7 is a flowchart showing the flow of error processing of this embodiment.
[0060]
First, the main switch 1001 is turned on to supply power to the apparatus (S3001). At this time, the path A is connected to the AC driver 1000.
[0061]
  Necessary DC power is supplied from the power source 1100 to the control circuit 1004, and the CPU 1004a starts operation. Thereafter, the relay 1002 in the AC driver 1000 is replaced with the CPU 1004.aIs switched to the route B (S3002). Thereafter, the apparatus becomes operable (S3003). This state is maintained until the voltage detection unit 1005 in the AC driver 1000 indicates that the main switch is turned off (S3004).
[0062]
When the voltage detection unit indicates that the main switch is turned off, the main switch is turned on again within a predetermined time (S3005), and when the predetermined time elapses while indicating OFF (S3005) In step S3005, the CPU 1004a switches the relay in the AC driver 1000 to the path A (S3006). The power source 1100 can hold the power source for a predetermined time after the supply of AC power is cut off.
[0063]
Thereafter, the CPU 1004a counts for a predetermined time after switching the relay until the power is not supplied (S3007) (S3008). When the power is turned off, the CPU 1004a is terminated as a normal shutdown. It is determined that the relay has failed (S3009).
[0064]
FIG. 8 is a flowchart showing the second error processing method of this embodiment. First, the main switch 1001 is turned on to supply power to the apparatus (S4001). At this time, the path A is connected to the AC driver 1000.
[0065]
Necessary DC power is supplied from the power source 1100 to the control circuit 1004, and the CPU 1004a starts operation. The CPU 1004a records relay failure information in the AC driver in the RAM 1004c, and first refers to the RAM 1004c at the start of operation to know the state of the relay when the power was last turned off (S4002). In this embodiment, when the failure information of the relay is stored in the RAM, it is determined that the relay is stuck on the front side of the main switch and has failed (S4003). Here, failure information is not recorded when the RAM is initialized. If failure information is not recorded, the relay in the AC driver is operated by the CPU 1004a.RoadSwitch to B (S4004). Thereafter, the apparatus becomes operable (S4005). This state is maintained until the voltage detection unit in the AC driver indicates that the main switch is turned off.
[0066]
When the voltage detection indicates that the main switch is OFF (S4006), relay failure information is recorded in the RAM 1004c (S4007). If no power is supplied to the CPU 1004a in S4008, relay failure information remains until the next device startup. Therefore, after the main switch is turned on next (S4001), it is detected as a failure of the relay attached to the front side of the main switch in S4002. Is done. When power is supplied to the CPU (S4008) and the main switch is turned on again within a predetermined time (S4009), the CPU becomes operable (S4005), and when a predetermined time elapses while indicating OFF (S4009), The CPU 1004a passes through a relay in the AC driver.RoadSwitch to A (S4010). The power source 1100 can hold the power source for a predetermined time after the supply of AC power is cut off.
[0067]
  Thereafter, the CPU 1004a clears the failure information of the relay in the RAM 1004c (S4011), and the power is turned off (S4042). Normal shutdown when power is off.The CPU 1004a counts the time after switching the relay (S4013), and if the power does not turn off after a predetermined time, it is determined that the relay has failed (S4015).
[0068]
(Example 2)
  A second embodiment of the present invention will be described with reference to FIG. When the SW 1001 is turned on, the control unit 1004 starts operation. The control unit 1004 switches the SW 1002 to the A route (S5001), confirms that the SW 1001 is ON (S5002), and proceeds to S5004. If the SW 1001 is not turned on (S5002), error processing is performed (S5003). In step S5004, initialization including processing for confirming and stabilizing the system is performed. The SW 1002 is kept on the A path until the system operation check is completed (S5004 to S5008). If an abnormality is detected during operation confirmation, the SW 1001 is forcibly turned off by the control unit 1004. In order to perform this operation smoothly, the route A is maintained until the initialization is completed. More specifically, the initialization process is first performed (S5004). If the route is not B (S5005), the completion of the operation check is confirmed (S5006). If not completed, the initialization process is continued, and the process is completed. If it becomes route Brelay1002 is switched (S5007) and the initialization process is continued. When the initialization process ends (S5008), a normal operation (system process) is performed (S5100). Also, the presence or absence of an operation for setting the time in the standby mode is checked (S5101). When there is an operation, the time setting is input from the operation unit 600 (S5102).
[0069]
This normal operation mode is continued until the SW 1001 is turned off (S5103). When the SW 1001 is turned off, the control unit 1004 enters a standby mode. The standby mode is for responding to a command from the outside such as FAX for a certain period of time even when the SW 1001 is turned off. When an external command is received in this mode (S5105), the process proceeds to the system (S5100) and the processing for the command is continued until the processing is completed. The standby mode is continued until the set time elapses from SW1001 OFF (S5106). If the time elapses, processing for terminating the system is performed (S5107), and if completed (S5108), the SW 1002 is switched so as to be route A (S5109), and the operation is stopped.
[0070]
(Example 3)
FIG. 10 shows the operation in the third embodiment.
[0071]
The main switch 1001 is turned on to supply power to the apparatus (S6001). At this time, the AC driver 1000 is connected to the path A.
[0072]
As a result, necessary DC power is supplied from the power source 1100 to the control circuit 1004, and the CPU 1004a starts operation. The CPU 1004a always records the latest switching information of the relays in the AC driver in the RAM 1004c. By referring to the relay switching information stored in the RAM 1004c at the start of the operation), when the power is turned off last time The state of the relay is determined (S6010). The CPU 1004a determines that the AC driver is operating normally when the relay is switched to the rear side of the main switch 1001, and determines that the relay is broken when switched to the front side (S6015). . Next, it is determined whether or not the data that has detected the failure of the voltage detection unit is recorded in the RAM 1004c (S6020). If there is a record, it is determined that the voltage detection unit has failed (S6025). If it is determined to be normal, the CPU 1004a checks whether or not the voltage detection unit in the AC driver detects that the main switch is turned on (S6030), and is normal if the voltage detection is turned on. If it is turned OFF, it is determined that the voltage detection unit is faulty (S6035). If it is normal, it is in an operable state (S6040). After counting the predetermined time, the CPU 1004a switches the relay in the AC driver 1000 to the front side of the main switch 1001 (S6040).
[0073]
Here, the CPU 1004a detects whether the main switch is in an ON state or an OFF state based on a signal from the voltage detection unit (S6050). If it is in the OFF state, the CPU 1004a jumps to S4006 in FIG. 8 (S6055). In the ON state, the CPU 1004a determines whether a predetermined time has not passed (S6060). If the predetermined time has not passed, the CPU 1004a jumps to S6040 to maintain the operable state and set the predetermined time. If it is determined that it has exceeded, the main switch 1001 capable of auto shut-off is switched to the OFF side (S6070). Next, the CPU 1004a determines whether or not the voltage detection indicates that the main switch 1001 is in an OFF state (S6080), and if it indicates an OFF state, the CPU 1004a jumps to S4006 in FIG. When the ON state is indicated, the CPU 1004a switches the relay in the AC driver to the rear side of the main switch (S6090). The power source 1100 can hold the power source for a predetermined time after the supply of AC power is cut off. The CPU 1004a records the failure of the voltage detection unit in the RAM 1004c (S6100), confirms whether or not a predetermined time has elapsed since switching the relay (S6110), and if the power does not turn off even after the predetermined time, it is stored in the RAM 1004c. After clearing the voltage detection failure data, the main switch failure is detected (S6115). When the power is turned off within a predetermined time, a failure of the voltage detector is detected at the next startup.
[0074]
(Example 4)
FIG. 11 shows a fourth embodiment of the present invention, in which 1001 is a main SW that is a first switching means for turning on and off the AC power source, and 1009 is a front of the main SW that is a first switching means. The relay is a second switching means for turning on and off the AC supply, 1003 is a voltage detection unit, 1004 is a control circuit for controlling switching of the main SW 1001 and the relay 1002, and 1100 is a power source. Reference numeral 1007 denotes a door switch.
[0075]
The operation of the power supply unit shown in FIG. 11 will be described using the flowchart of FIG.
[0076]
Before the main switch 1001 is turned on, the AC switch 1002 is switched to the off side. When the main switch 1001 is turned on (S7001), the AC switch 1002 is turned on mechanically in synchronization (S7002). When the main switch 1001 is turned on, AC power is supplied to the power supply circuit 1100, and the voltage detection unit 1003 outputs a signal indicating that the main switch 1001 is turned on to the control circuit 1004. The control circuit 1004 starts system control when power is supplied.
[0077]
When the operation starts, the control circuit 1004 confirms that the main switch 1001 is turned on (S7003). If it cannot be confirmed that the main switch is turned on, error processing is performed as a failure of the voltage detection unit 1003 or the main switch 1001 (S7004). If it is confirmed that the main switch 1001 is turned on, the system is initialized such as confirmation of system operation and processing for stabilization (S7005). When the initialization is completed, a normal operation mode is entered (S7006). This mode is continued until the main switch 1001 is turned off (S7007). When the main switch 1001 is turned off (at this time, the AC switch 1009 is not turned off in synchronization with the main switch off timing), processing for system termination is performed (S7008). When the processing is completed, the AC switch 1002 is turned off. The operation of the switching system is stopped (S7009).
[0078]
(Example 5)
The hardware configuration of the power supply unit in this embodiment is the same as that in the fourth embodiment.
[0079]
FIG. 13 is a flowchart showing the operation of the fifth embodiment of the present invention.
[0080]
First, the main switch 1001 is turned on to supply power to the apparatus. At this time, the AC switch 1002 is turned on in mechanical synchronization with the main switch (S7001).
[0081]
As a result, necessary DC power is supplied from the power source 1100 to the control circuit 1004, and the CPU 1004a starts operation. When power is not supplied to the CPU 1004, the AC switch is faulty (S8002, S8003).
[0082]
The CPU 1004a to which the power is supplied performs predetermined initialization, and the apparatus can operate while the main switch is on (S8004). This state is maintained until voltage detection in the AC driver indicates that the main switch is turned off.
[0083]
When the main switch is turned off, the voltage detection unit 1003 sends a signal indicating that the voltage detection is turned off to the CPU, and the CPU recognizes that the main switch is turned off (S8005).
[0084]
If the surface switch is turned on again within a predetermined time after the voltage detection indicates that the main switch is turned off, the operation becomes possible again, and the CPU 1004a turns off the AC switch when the predetermined time elapses while indicating OFF. (S8007). As a result, the AC power supply can be stopped when it is not used for a long time, such as at night, and energy can be saved.
[0085]
If the power is turned off, the shutdown is normal (S8008). If the power does not turn off after a predetermined time (S8009), it is determined that the AC switch has failed (S8010).
[0086]
【The invention's effect】
  According to the present invention,The configuration described, ieAC powermanuallyON / OFFIn switch and this main switchBefore and afterFromAC supplySelectivelySwitchSub switch (Second switching means)ProvidedFurther, upon receipt of the AC supply from the sub switch, the control means for performing the OFF control of the main switch and the switching control of the sub switch is operated. In addition, since the state detection means for detecting the AC supply state after the main switch is included and the control means includes the failure detection function of the main switch, the sub switch, and the state detection means, the main switch is turned off. Later, for cooling devices that cool the inside of the deviceEnergy saving can be achieved with a simple circuit configuration for devices that cannot be turned off, and for devices that need to be on standby for copying with a fax machine.At the same time, it becomes possible to detect failures related to these controls.
[0087]
  Also,It becomes possible to individually detect the failure of the main switch, the sub switch (second switching means), and the state detection means for detecting the AC supply state after the main switch,The failure location can be easily identified at the time of failure.
[0088]
  Further, after the power is turned on, it is possible to know a failure (operation failure) of the sub switch (second switching means) at the time of the previous power interruption.
[Brief description of the drawings]
FIG. 1 is a hardware block diagram of a power supply unit of an image forming apparatus according to an embodiment of the present invention.
FIG. 2 is a hardware block diagram of a power supply unit of the image forming apparatus according to the prior art.
FIG. 3 is a cross-sectional configuration diagram illustrating an example of a mechanical configuration of the image forming apparatus of the present invention.
FIG. 4 is a hardware block diagram illustrating an example of a control system of the image forming apparatus of the present invention.
FIG. 5 is a schematic diagram illustrating an arrangement configuration example of an operation unit 600 provided in the main body 100. FIG.
FIG. 6 is a flowchart showing the operation of the control circuit in Embodiment 1 of the present invention.
FIG. 7 is a flowchart showing error processing in Embodiment 1 of the present invention.
FIG. 8 is a flowchart showing second error processing in Embodiment 1 of the present invention.
FIG. 9 is a flowchart showing the operation of the control circuit in the second embodiment of the present invention.
FIG. 10 is a flowchart showing the operation of the control circuit in the third embodiment of the present invention.
FIG. 11 is a hardware block diagram of a power supply unit according to a fourth embodiment of the present invention.
FIG. 12 is a block diagram showing the operation of the control circuit in the fourth embodiment of the image forming apparatus of the present invention.
FIG. 13 is a flowchart showing the operation of the control circuit in the fifth example of the present invention.
[Explanation of symbols]
100 Copier body
200 Circulating automatic document feeder or feeder (RDF) for automatic document feeding
250 Sorting device or sorter
101 Document glass as a document table
102 Optical system as image reading means
103 Document illumination lamp (exposure lamp)
143 lens
104 motor
105 Photosensitive drum
106 Primary charger
107 Blank exposure unit
108 Potential sensor
109 Developer
110 Transfer charger
111 Separating charger
112 Cleaning device
113 Main motor
114 Upper cassette
115 Lower cassette
116,117 Pickup roller
118,119 Paper feed roller
120 Registration roller
121 Conveyor belt
122 Fixing device
123 Discharge roller
124 decks
125 lifter
126 Paper feed roller
127 Paper discharge flapper
128 Lower conveyance path
129 Reverse path
130 Refeed tray
131 Multiple flapper that switches between double-sided recording and multiple recording paths
132 Paper feed roller
133 Paper feed path
134 Paper discharge roller
140 First feed roller
142 Reverse roller
600 Operation unit
601 Asterisk (*) key
627 Cursor key
628 OK key
606 All reset key
602 Key to press to return to normal mode from all shut-off state
605 Copy start key (Copy start key)
604 Clear / Stop key
603 numeric keypad
619 Memory key
611,612 Copy density key
613 AE key
607 Copy paper selection key
150 Multi-manual feed
610 1x key
616 Auto scaling key
626 Double-sided key
625 Binding key
624 photo key
623 Multiple key
620 Document frame erase key
621 Sheet frame erase key
629 Cover mode setting key
630 page continuous shooting key
614 Staple sort, sort, group discharge method selection key
631 Reserved key
210 Reservation tray
632 Reservation setting key
633 Guide key
701 LCD (Liquid Crystal) that displays information about copying
603 numeric keypad
608,609 Fixed magnification key
610 1x key
617, 618 Zoom key
607 Paper selection key
704 AE indicator
613 AE key
709 Preheat indicator
1004 Control circuit (controller)
1004a CPU
1004b ROM
1004c RAM
302 thermistor
144 Fixing roller
303 High pressure controller
106 Primary charger
110 Transfer charger
109 Developer
304 High pressure unit
305 Motor controller
306 motor
307 DC load controller
116 Pickup roller
308 Sensors for detecting paper jams on transfer paper
1000 AC driver
1100 power supply
1002 Second switching means
1003 Switching operation detection to detect main SW switching operation
1005 Control system power supply
1006 Power supply and motor power supply that require accuracy
1007 Door switch

Claims (7)

A first switching means for switching between an ON state and an OFF state of an AC power source to be supplied to a device that is supplied with an AC power source;
A second switching means for switching between the AC power supply path from the front of the first switching means and the AC power supply path from the back;
Driven by a control power supply that receives the output of the second switching means, and switching the first switching means from an ON state to an OFF state at least when the device is not used for a first predetermined time ; and look including a driving control of the switching means, and a control means for executing a shut-off operation of the power supply to the device,
State detecting means for detecting an ON state or an OFF state of the first switching means;
Storage means for storing the state of the second switching means;
With
The control means switches the second switching means to the AC power supply path from the front after the state detecting means detects that the first switching means is turned on , and the state detecting means Based on the elapse of a second predetermined time after detecting that the first switching means is in the OFF state, the second switching means is switched to the AC power supply path after the second,
After the second switching means is switched to the later AC power supply path, the second switching means fails if the power supplied to the control means is not shut off within a third predetermined time. A first failure detection function that determines that
When the first switching means is in an ON state and AC power is supplied, the content stored in the storage means indicates a later AC power supply path, and the state detection means detects an OFF state And a second failure detection function for determining that the state detection means has failed,
When the device is not used for the first predetermined time, the first switching unit is turned off, and the second switching unit is turned on after the state detecting unit detects the ON state. A third failure detection function for determining that the first switching means has failed when the power supplied to the control means does not turn off after a fourth predetermined time has elapsed. ,
Power cutoff device characterized in that it comprises a. When the first switching means is in an ON state and AC power is supplied, the storage means is read, and when the read content does not indicate the AC power supply path after the second switching means, 2. The power shut-off device according to claim 1 , further comprising a fourth failure detection function for determining that the second switching unit has failed. The storage means can record failure information of the second switching means, and the control means can detect the second switching means when the state detecting means detects an OFF state of the first switching means. storing failure information when said second switching means is switched to AC power supply path from after the, according to claim 2, characterized in that erasing the malfunction information of the second switching means Power shut-off device. The control means is configured such that when the first switching means is turned on and failure information of the second switching means is recorded when AC power is supplied, the second switching means fails. The power shut-off device according to claim 3 , further comprising a fourth failure detection function that determines that the power is off. When the first switching means is in an ON state and AC power is supplied , the control means indicates that the content stored in the storage means indicates a later AC power supply path, and the state detection means is OFF. when detecting the state, power cutoff device according to claim 1, characterized in that it comprises a fifth failure detection function determines that said state detecting means is faulty. The storage means can record failure information of the state detection means, the control means generates the switching signal to turn the first switching means OFF, and the state detection means detects the ON state. The second switching means is switched to the later AC power supply path, the failure information of the state detecting means is recorded in the storage means, and then the control is performed after the fourth predetermined time. power cutoff device according to claim 1, characterized in that erasing information of the failure of the state detecting means power supplied to the unit is stored in the storage means when falling. An image forming apparatus comprising the power cutoff device according to any of claims 1 6.

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