JPH08265968A - Power shutoff device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a power cutoff device capable of saving energy in a device that requires a cooling operation after power cutoff. A first switching means for turning on and off an AC power source, a second switching means for switching between an AC supply progress before the first switching means and an AC supply progress after the first switching means, and the first switching means. The first switching means for detecting the ON or OFF state of the switching means, and the control means for switching the second switching means based on the state detected by the detecting means. Means O
The second switching means is switched to the subsequent path based on the lapse of a predetermined time after the FF state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to energy saving of an image forming apparatus, and more particularly to shutting off the power of the image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, in order to save energy in an image forming apparatus, auto shutoff has been performed as a method of shutting off power. FIG. 2 is a view showing a conventional example, in which the main switch 1001 is cut off by the control circuit 1004.

[0003]

However, when the device becomes large and the power consumption becomes large, the main switch is turned off.
After that, it is necessary to gradually cool the inside of the machine. Therefore, conventionally, the power supply required for cooling the inside of the machine has not been cut off.

[0004]

In order to achieve the above-mentioned object, the invention of claim 1 is a first switching means for switching between an ON state and an OFF state of an AC power source, and before the first switching means. AC power supply progress from AC and later AC
Second switching means for switching the power supply progress, state detecting means for detecting the ON state or OFF state of the first switching means, and the second switching based on the state detected by the state detecting means. And a control means for switching the means.

According to a second aspect of the present invention, in the power shutoff device according to the first aspect, a failure detecting means for detecting a failure of the second switching means is further provided.

According to a third aspect of the present invention, in the power shutoff device according to the first or second aspect, there is further provided means for detecting a failure of the first switching means, and means for detecting a failure of the state detecting means. It is characterized by having.

According to a fourth aspect of the present invention, in the power shutoff device according to any one of the first to third aspects, the second switching means is switched by turning on the first switching means. Is characterized by.

According to a fifth aspect of the present invention, in the power interruption device according to any one of the first to fourth aspects, when the first switching means is turned off, the AC power is supplied through the second switching means. Is retained.

According to a sixth aspect of the present invention, in the power supply interruption device according to any one of the first to fifth aspects, the second switching means is turned off after the first switching means is turned off. It is characterized in that it is provided with a blocking means for switching to the route.

According to a seventh aspect of the present invention, in the power-source cutoff device according to the sixth aspect, the second cutoff means is based on a lapse of a predetermined time after the first switching means is turned off. The switching means is switched to the latter path.

According to an eighth aspect of the present invention, in the power cutoff device according to any one of the second to seventh aspects, the failure detecting means detects an OFF state of the state detecting means, and the second switching is performed. If the power supply is not shut off within a predetermined time after the means switches the AC supply to a time after the first switching means, it is determined that the second switching means is out of order. .

According to a ninth aspect of the present invention, in the power cutoff device according to any one of the second to seventh aspects, the failure detection means includes storage means for storing the AC supply progress of the second switching means, and When the first switching means is turned on and AC power is supplied, the storage means is read, and the read content does not indicate the progress after the first switching means. And a means for determining that the second switching means is out of order.

According to a tenth aspect of the present invention, in the power interruption device according to the ninth aspect, when the state detecting means detects the OFF state of the first switching means, the failure information of the second switching means is sent. The failure information is stored and erased when the second switching unit is switched to the rear side of the first switching unit.

According to an eleventh aspect of the present invention, in the power source interruption device according to the tenth aspect, the first switching means is turned on.
When the AC power is supplied and the failure information is recorded, the failure detection means determines that the second switching means has a failure.

According to a twelfth aspect of the present invention, in the power cutoff device according to any one of the second to seventh aspects, the failure detection means has a storage means for storing a state of the second switching means, and The first switching means is turned on and A
When the C power is supplied, the contents stored in the storage means indicate the progress of the AC supply after that, and when the state detection means detects the OFF state, the state detection means is out of order. It is characterized by determining that.

According to a thirteenth aspect of the present invention, in the power shutoff device according to any one of the second to seventh aspects, a means for detecting the use status of the forming device operated by the AC power source and the device are used for a certain period of time. If not, it is characterized by further comprising means for generating a switching signal for switching the first switching means to an OFF state, and means for turning the first switching means to the OFF state by the switching signal.

According to a fourteenth aspect of the present invention, in the power interruption device according to the thirteenth aspect, the first switching means is turned off by the automatic switching signal generating means,
When the state detecting means detects the OFF state, the second switching means is switched to the subsequent AC supply progress, and when the power supply of the detecting means does not turn off after a lapse of a fixed time, the first switching means It is characterized in that it is judged that the switching means is out of order.

According to a fifteenth aspect of the present invention, in the power supply interruption device according to the thirteenth aspect, the first switching means is turned off by the switching signal generating means, and the state detecting means detects the off state. In the case where the second switching means is switched to the later AC supply progress, the failure information of the state detecting means is recorded in the storage means, and the power of the detecting means is not turned off after a certain period of time, the It is characterized in that it is determined that the first switching means is out of order.

According to a sixteenth aspect of the present invention, in the power interruption device according to any one of the first to fifteenth aspects, the state detecting means is supplied with power from the second switching means.

According to a seventeenth aspect of the present invention, in the power shutoff device according to any one of the first to sixteenth aspects, the state detecting means detects the state by the voltage of the power source.

The invention of claim 18 is the power interruption device according to claim 1, wherein the second switching means is connected to the rear side A immediately after the first switching means is turned on.
It is characterized by switching to C supply progress.

According to a nineteenth aspect of the present invention, in the power shutoff device according to the first aspect, the second switching means is switched to the AC supply progress on the front side after the state detecting means detects the ON state. Characterize.

According to a twentieth aspect of the present invention, in the power interruption device according to the nineteenth aspect, the second switching means is connected to the front side AC after a lapse of a predetermined time after detecting the ON state.
It is characterized by switching to the supply progress.

According to a twenty-first aspect of the present invention, in the power shutoff device according to the nineteenth aspect, after detecting the ON state, the second switching means is switched to the AC supply progress of the front side based on other conditions. Characterize things.

The invention of claim 22 is characterized in that it is provided with the power interruption device according to any one of claims 1 to 21.

[0026]

According to the present invention, it has the first switching means for turning on and off the AC power source, the first switching means, and the second switching means for switching the AC supply before and after the first switching means. Even in a device that is large in size, consumes a large amount of power, and requires internal cooling after the main switch is turned off, it is possible to further save energy.

Further, even in an apparatus having a FAX function, after the main switch is turned off, it is possible to keep the power supply required for FAX reception standby for a predetermined time and shut off the power after a lapse of a predetermined time, thus saving energy. Can be achieved.

According to the above construction, when the second switching means sticks to the front side of the main switch in the path for switching AC, it is not possible to cut off all the power supply, and the expected energy saving effect is obtained. Can't get 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 the processing such as in-machine cooling necessary for the device cannot be performed. Moreover, with respect to these failures, it is considered that the user often does not notice the failures because normal operations do not become abnormal unless the processing required for energy saving operation or device shutdown is performed.

However, according to the present invention, by providing the failure detecting means of the second switching means of the AC power supply path, the failure can be surely detected.

[0030]

Embodiments of the present invention will be described below with reference to the drawings.

(Configuration Common to Each Embodiment) FIG. 3 is a sectional configuration view showing an example of the image forming apparatus of the present invention.

In FIG. 3, reference numeral 100 denotes a copying apparatus main body, 2
Reference numeral 00 is a circulating automatic document feeder or feeder (RDF) for automatically feeding documents, 250 is a sorter or sorter, and these RDF 200 and sorter 250 are the main body 1
00 can be used in any combination.

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 unit, which is a document illumination lamp (exposure lamp).
103, a scanning mirror, a lens 143, and the motor 10
The exposure lamp 103 illuminates the original while scanning by the motor 104, and the reflected light from the original is applied to the photosensitive drum 105 by the scanning mirror and the lens.

Around the photosensitive drum 105, a primary charger 106, a blank exposure unit 107, a potential sensor 108, a developing device 109 and a transfer charger 110,
A separation charger 111 and a cleaning device 112 are provided, and the photosensitive drum 105 and the like constitute an image recording unit.

The photosensitive drum 105 is the main motor 113.
3 is rotated in the direction of the arrow shown in FIG. 3 and is corona-charged by the primary charger 106.
When the reflected light of the original is emitted from, an electrostatic 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 upper cassette 114
Alternatively, from the lower cassette 115 to the pickup roller 1
The transfer paper sent into the main body 100 by the paper feed rollers 118 and 119 via the registration rollers 12 and 16.
When the timing is set so that the leading edge of the toner image and the leading edge of the transfer paper coincide with each other by 0, the toner image is fed to the photosensitive drum 105, and the toner image is transferred by the transfer charger 110. After this transfer, the transfer paper is separated from the photoconductor drum 106 by the separation charging device 111, guided to the fixing device 122 by the transfer belt 121, fixed by pressure and heating, and then discharged to the outside of the main body 100 by the discharge roller 123. Is discharged. Further, the photosensitive drum 105 is the cleaning device 11
2, the surface is cleaned.

Further, the main body 100 is equipped with a deck 124 capable of accommodating, for example, 4000 sheets of transfer paper.
The lifter 125 of the deck 124 ascends according to the amount of transfer paper so that the transfer paper always contacts the paper feed roller 126. Further, in FIG. 3, 127 is a paper discharge flapper, which is a double-sided recording side or multiple recording side and a discharge side (sorter 25).
0) Switch the route. The transfer paper sent from the discharge roller 123 is switched to the double-sided recording side or the multiple recording side by the discharge flapper 127. Also, 128
Is a lower conveyance path, which guides the transfer paper sent from the discharge roller 123 to the re-feed tray 130 by reversing the transfer paper via the reversing path 129. Further, reference numeral 131 is a multiple flapper that switches between double-sided recording and multiple recording paths. By tilting this flapper to the left, the transfer paper is not passed through the reverse path 129,
Directly to the lower transport path 128. Reference numeral 132 denotes a paper feed roller for feeding the transfer paper to the photosensitive drum 105 side through the path 133. Denoted at 134 is a discharge roller which is disposed near the discharge flapper 127 and discharges the transfer sheet switched to the discharge side by the discharge flapper 127 to the outside of the machine.

At the time of double-sided recording (double-sided copying) or multiplex recording (multiplex copying), the discharge flapper 127 is raised and the copied transfer sheet is turned upside down via the conveying paths 128 and 129 to re-feed the tray. Store in 130. At this time, the multiple flapper 131 is tilted to the right for double-sided recording, and the multiple flapper 131 is tilted to the left for multiple recording. At the time of next-side recording or multiplex recording to be performed next, the transfer sheets stored in the re-feed tray 130 are guided to the registration rollers 120 of the main body through the path 133 by the sheet feeding roller 132 one by one from the bottom. When reversing and ejecting the transfer paper from the main body, raise the paper ejection flapper 127,
The flapper 131 is tilted to the right, the copied transfer sheet is conveyed to the conveying path 129 side, and after the trailing end of the transfer sheet passes the first feed roller 140, it is conveyed to the second feed roller side by the reversing roller 142. Then, the transfer roller is turned over by the discharge roller 134 and discharged to the outside of the machine.

FIG. 4 is a block diagram showing an example of a control system of the image forming apparatus of the present invention. In the figure, reference numeral 1004 denotes a control circuit (controller), which is a CPU 1004a, RO
The M1004b, the RAM 1004c, etc.
The overall control of the copy sequence is performed based on the program stored in M1004b.

The operation unit 600 includes a copy mode (single-sided /
(2-sided / multiplex mode, copy magnification, cassette selection, etc.) setting key, numeric keypad for setting the number of copies, start key for instructing copy operation start, stop key for instructing copy operation stop, reset for returning operation mode to standard state Key,
A key input unit such as the above and a display unit such as an LED and a liquid crystal for displaying the setting state of the operation mode and the like are arranged.

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. Controller 1004
Is determined by the detection value of the thermistor 302.
The surface temperature of No. 4 is controlled to a predetermined value.

The high voltage controller 303 includes a primary charger 106,
The charging system such as the transfer charger 110 and the high voltage unit 304 for applying a predetermined potential to the developing device 109 are controlled.

The motor control unit 305 controls the driving of the motor 306 such as various stepping motors and main drive motors.

The DC load controller 307 controls driving of solenoids for the pickup roller 116 and the like, clutches for the registration roller 120 and the like, and a fan and the like.

Reference numeral 308 denotes sensors for detecting a paper jam of the transfer paper, which is input to the controller 1004.

The AC driver 1000 includes an AC load 310 such as the original illumination lamp 103 and a fixing heater 311.
Control the AC power supply to the. Also, the original illumination lamp 1
03, an abnormality of the fixing heater 311 or the like is detected, and the main switch 1001 with a shut-off function is turned off. Further, under the control of the controller 1004, the AC inputs before and after the main switch 1001 are switched and input to the power supply 1100.

The power supply 1100 supplies DC power to the controller 1004, etc.
While the C power source is input, the AC power source via the main switch 1001 and the door switch 1007 is input to the power source 1100 from the input power source plug 311.

The paper deck 124 is a paper feeding device for increasing the number of transfer sheets to be loaded, the feeder 200 is an automatic document feeder for automatically setting a plurality of documents, and the sorter 250 is a transfer device to be ejected. This is a sorting device for sorting paper.

FIG. 5 shows an arrangement configuration example of the operation unit 600.

In FIG. 5, an asterisk (*) key 601 is used in the setting mode such as the binding margin amount setting or the document frame erasing size setting. A cursor key 627 is used to select a setting item in the setting mode. An OK key 628 is used to confirm the setting contents in the setting mode. An all reset key 606 is pressed when returning to the standard mode. The key 602 is also pressed when returning from the auto shutoff state to the standard mode. A copy start key (copy start key) 605 is pressed to start copying.

A clear / stop key 604 has the function of a clear key during standby (standby) and a stop key 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 pushing is completed, the copying operation is stopped. Reference numeral 603 is a ten-key pad, which is pressed to set the number of copies. It is also used when setting the * (asterisk) mode. 6
Reference numeral 19 denotes a memory key, which allows the user to register a mode that is frequently used. Here, 4 of M1 to M4
You can register the street mode.

Reference numerals 611 and 612 denote copy density keys,
Press to adjust the copy density manually. An AE key 613 is pressed when the copy density is automatically adjusted according to the density of the original, or when the AE (automatic density adjustment) is canceled and the density adjustment is switched to manual (manual).
A copy paper selection key 607 includes an upper paper lifter 119, a lower paper lifter 115, and a paper deck 12.
4. Press when selecting multi-manual feed 150. Also,
When a document is placed on the RDF300, press this key 6
APS (automatic paper cassette selection) can be selected by 07. When APS is selected, a cassette having the same size as the original is automatically selected.

Reference numeral 610 denotes a unity size key, which is pressed to make a unity size (original size) copy. An automatic scaling key 616 is pressed to automatically reduce or enlarge the image of the original according to the designated copy paper size. Reference numeral 626 denotes a double-sided key, which is pressed to make 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 can create a binding margin of a designated length on the left side of the transfer sheet. A photo key 624 is pressed when copying a photo original. A multiple key 623 is pressed when creating (combining) images from the two originals on the same surface of the transfer paper.

Reference numeral 620 denotes an original frame erasing key, which is pressed by the user when erasing the frame of a standard size original document, and at that time, the size of the original document is set by the asterisk key 601. 62
Reference numeral 1 denotes a sheet frame erasing key, which is pressed to erase the frame of the original in accordance with the copy paper size. Reference numeral 629 is a cover mode setting key, which is used when the front cover, the back cover are created and a slip sheet is inserted. Reference numeral 630 denotes a page continuous shooting key, which is used when the left and right sides of a two-page spread book are continuously copied.
Reference numeral 614 denotes a sheet discharge method selection key for selecting a staple sort, sort, and group discharge method. When the stapled sorter is connected to the sheet after recording, the staple sort mode, the sort mode, or the group mode is selected. The selection mode can be canceled.

Reference numeral 631 denotes a reservation key, which is the reservation tray 21.
It is used when starting the setting of the copy mode for the reserved original placed on 0 and when canceling the reserved setting.
A reservation setting key 632 is used as an enter key when the reservation mode is set. Reference numeral 633 is a guide key, which is used when displaying explanations of functions corresponding to various keys on the message display. An LCD (liquid crystal) type message display 701 displays information about copying, and displays characters and figures with 96 × 192 dots.
For example, the number of copies set with the numeric keypad 603, the standard variable magnification keys 608 and 609, the equal magnification key 610, the zoom key 6
Copy magnification and paper selection key 607 set in 17, 618
The sheet size selected in step 3, a message indicating the state of the copying apparatus main body 100, a guide message indicating the operating procedure, and other settings of various modes are displayed.

Reference numeral 704 denotes an AF display, which is an AE key 61.
Lights when AE (automatic density adjustment) is selected by 3. Reference numeral 709 denotes a preheat indicator, which lights up in the preheat state. When using the RDF200 in the standard mode, one copy number, density AE mode, automatic paper selection,
Single-sided original to single-sided copy is set. RDF20
In the standard mode when 0 is not used, the number of copies is one, the density manual mode is set to the same size, and one-sided original to one-sided copying is set. The difference between using and not using RDF200 is RD
It is determined by whether or not the document is set on the F200.

FIG. 7 is a flow chart showing the flow of error processing of this embodiment.

First, the main switch 1001 is turned on to supply power to the apparatus (S3001). At this time A
The route A is connected to the C driver 1000.

The necessary DC power is supplied from the power supply 1100 to the control circuit 1004, and the CPU 1004a starts its operation. After that, the relay 1002 in the AC driver 1000
Is switched to progress B by the CPU 1004 (S
3002). After that, the device becomes operable (S30
03). This state is maintained until the voltage detection unit 1005 in the AC driver 1000 indicates that the main switch is turned off (S3004).

When the voltage detecting section indicates that the main switch is turned off, when the main switch is turned on again within a predetermined time, it becomes operable (S30).
05), when a predetermined time elapses while indicating OFF (S
3005), the CPU 1004a is the AC driver 1000
The internal relay is switched to the route A (S3006). The power supply 1100 can hold the power supply for a predetermined time after the AC power supply is cut off.

Thereafter, the CPU 1004a switches the relay until the power is no longer supplied (S3007) and counts for a predetermined time (S3008). If the power is turned off, the shutdown is terminated normally, and the power is turned off even after a predetermined time. If not, it is determined that the relay has failed (S3).
009).

FIG. 8 is a flow chart showing the second error processing method of this embodiment. First, the main switch 100
1 is turned on to supply power to the device (S4001).
At this time, the path A is connected to the AC driver 1000.

The necessary DC power is supplied from the power supply 1100 to the control circuit 1004, and the CPU 1004a starts its 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 turned off last time (S400).
2). In this embodiment, when the failure information of the relay is stored in the RAM, it is determined that the relay is stuck to the front side of the main switch and is in failure (S4003). Here, no failure information is recorded when the RAM is initialized. If no failure information is recorded, the relay in the AC driver is switched to progress B by the CPU 1004a (S4004). The device is then ready for operation (S
4005). This state is maintained until the voltage detection unit in the AC driver indicates that the main switch is off.

When the voltage detection indicates that the main switch is off (S4006), RAM1
Relay failure information is recorded in 004c (S4007).
If power is not supplied to the CPU 1004a in S4008, relay failure information remains until the next device startup, so after the main switch is turned on (S400).
1) In S4002, it is detected that the relay main switch is stuck on the front side. When power is supplied to the CPU (S4008) and the main switch is turned on again within a predetermined time (S4009), the CPU is in an operable state (S4005), and when a predetermined time elapses while the power is OFF (S4009), The CPU 1004a switches the relay in the AC driver to the progress A (S4010). The power supply 1100 can hold the power supply for a predetermined time after the AC power supply is cut off.

After this, the CPU 1004a turns to the RAM 1004.
The failure information of the relay c is cleared (S4011), and the power is turned off (S4042). If the power is turned off, the CPU 1004a performs a normal shutdown, and counts the time after switching the relay (S4013). If the power is not turned off after a predetermined time, it is determined that the relay has failed (S4015).

(Embodiment 1) FIG. 1 shows the configuration of a power supply unit of the present invention. In the drawing, 1001 is a main SW, 1002 which is a first switching means for turning ON / OFF the AC power supply.
Is a relay which is the second switching means for switching the AC supply before and after the main SW, and 1003 is the main SW
Is a voltage detection unit that detects the state of and the detection signal is generated according to the detected state. In this embodiment, the voltage detector 100
3 detects the switching state of the first switching means. A control circuit 1004 controls switching of the relay 1002 according to the state of the main SW 1001. 1100 is a power supply, and there are two main systems. 100
Reference numeral 5 designates a 5V system for driving a control system such as the control circuit 1004, a 24VU system power source for driving a clutch solenoid, etc. 1006 Yes 24 for analog signals requiring precision.
It is a 38VU power source for the VR and the main motor and the optical motor. 1007 is a door switch.

Before SW1001 is turned on, SW10
02 is the rear side of SW1001 (SW1001 in FIG. 1)
It is switched to supply AC power to the power supply circuit 1005 from the AC line on the right side of FIG. This route is called route A. When the SW1001 is turned on, the AC power is supplied to the power supply circuit 1005, and the voltage detection circuit 1003 is operated by
A signal indicating that 01 is turned on is output to the control unit 1004. The control unit 1004 starts the control operation of the power supply unit when power is supplied.

The control operation of the power supply unit will be described with reference to the flowchart of FIG. When the operation of the control unit 1004 is started, first, a signal is sent to the SW 1002 so that the route A is set (S2001). The SW 1002 is switched at the same time when the operation is started in order to quickly eliminate the influence of an undefined time such as a reset. Next, it is confirmed that the SW1001 is turned on (S2002). When the SW 1001 is not turned on, error processing is performed as a failure of the voltage detection unit 1003 or the SW 1001 (S2011). SE100
When 1 is turned on, SW1002 is switched so that power is supplied to the power supply circuit 1005 from the AC line on the front side of SW1001 (the left side of SW1001 in FIG. 1) (S2003). Hereinafter, this route will be referred to as route B.
Next, system initialization including system operation confirmation and system stabilization processing is performed (S200).
4). When the initialization is completed (S2005), a normal operation mode is entered and system processing is performed (S2006). System processing (normal operation) (S2006) is performed by SW100.
It continues until 1 is turned off. SW1001 is OF
If F is issued, processing for ending the system is performed (S20
08), when the processing is completed (S2009), the SW 1002 is switched to the A route (S2011) and the system operation is stopped.

(Embodiment 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 operating. SW1 in the control unit 1004
002 is switched to A path (S5001), SW1001
Check that is turned on (S5002) S50
Go to 04. If SW1001 is not turned on (S
5002) and error processing is performed (S5003). S50
At 04, initialization including processing for confirming and stabilizing the operation of the system is performed. SW1002 is kept on the A path until the system operation check is completed (S5004 to S500).
8). When an abnormality is detected during the operation check, the control unit 1004 forcibly turns off the SW 1001. In order to perform this operation smoothly, the route A is kept until the initialization is completed. More specifically, first, initialization processing is performed (S
5004) If it is not on the B path (S5005) Confirm the end of the operation confirmation (S5006) If it is not completed, continue the initialization process, and if it is completed, switch the SW1002 to switch to the B path (S5007) , Continue the initialization process. When the initialization process is completed (S5008), normal operation (system process) is performed (S5100). Further, it is checked whether or not there is an operation for setting the time in the standby mode (S5101), and if there is an operation, the time setting is input from the operation unit 600 (S5102).

This normal operation mode is turned on by SW1001.
Continue until FF is performed (S5103). When the SW 1001 is turned off, the control unit 1004 enters the standby mode.
In standby mode, even if SW1001 is turned off,
This is for responding to an external command such as a fax. When an external command is received in this mode (S
5105) Proceed to the system (S5100) and continue the processing for the instruction until the processing is completed, and when the processing is completed, enter the standby mode again. The standby mode is continued until the set time elapses from SW1001 OFF (S5106).
When the time elapses, a process for ending the system is performed (S5107), and when the process ends (S5108), the SW 1002 is switched to the A route (S5109) and the operation is stopped.

(Third Embodiment) FIG. 10 shows the operation of the third embodiment.

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.

As a result, the power supply 11 is supplied to the control circuit 1004.
00 supplies the necessary DC power, and the CPU 1004a
Starts to work. The CPU 1004a always stores the latest switching information of the relay in the AC driver in the RAM 1004c.
The relay state when the power was turned off last time is determined by referring to the relay switching information stored in RAM 1004c at the start of the operation (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 defective when the relay is switched to the front side (S6015). . Next, it is determined whether or not the data for detecting the failure of the voltage detection unit is recorded in the RAM 1004c (S6020). If the data is recorded, it is determined that the voltage detection unit is defective (S6025). If the CPU 1004a determines that the voltage is normal, the CPU 1004a checks whether the voltage detection unit in the AC driver detects that the main switch is turned on (S6030), and the voltage detection is turned on.
If it is, it is determined to be normal, and if it is OFF, it is determined to be a voltage detection unit failure (S6035).
If it is normal, the operation is ready (S604).
0). After counting the predetermined time, the CPU 1004a sets the relay in the AC driver 1000 to the main switch 10
It switches to the front side of 01 (S6040).

Here, the CPU 1004a detects whether the main switch is in the ON state or the OFF state by the signal from the voltage detecting section (S6050), and when it is in the OFF state, jumps to S4006 of FIG. 8 described above (S6).
055). In the ON state, the CPU 1004a determines whether or not the device has not been used for a predetermined time (S6060).
When it is determined that the operation state is maintained by jumping to 6040 and the predetermined time is exceeded, the main switch 1001 capable of auto shut-off is switched to the off side (S6070). Next, the CPU 1004a determines whether the voltage detection indicates that the main switch 1001 is in the OFF state (S6080), and if it indicates the OFF state, the CPU 1004a jumps to S4006 in FIG. ON
When the state is indicated, the CPU 1004a switches the relay in the AC driver to the rear side of the main switch (S6090). The power supply 1100 can hold the power supply for a predetermined time after the AC power supply is cut off. CPU 1004
a records the failure of the voltage detection unit in the RAM 1004c (S
6100), it is confirmed whether a predetermined time or more has passed after switching the relay (S6110), and if the power does not turn off after the predetermined time has passed, the data of the voltage detection failure stored in the RAM 1004c is cleared, and then the main switch The failure is detected (S6115). If the power is turned off within the predetermined time, the failure of the voltage detection unit is detected at the next startup.

(Embodiment 4) FIG. 11 shows a fourth embodiment of the present invention, in which 1001 is a first for turning ON / OFF the AC power source.
A main switch 1009, a relay 1009, which is a second switch means for turning on and off the AC supply before the main SW which is a first switch means, a voltage detector 1003, Reference numeral 1004 is a control circuit for controlling switching between the main SW 1001 and the relay 1002, and 1100 is a power supply. 10
Reference numeral 07 is a door switch.

The operation of the power supply unit shown in FIG. 11 will be described with reference to the flowchart of FIG.

Before the main switch 1001 is turned on, the AC switch 1002 is switched to the off side. A when the main switch 1001 is turned on (S7001)
The C switch 1002 is mechanically synchronized and turned on (S
7002). A when the main switch 1001 is turned on
The C power is supplied to the power supply circuit 1100, and the voltage detection unit 10
03 outputs a signal indicating that the main switch 1001 is turned on to the control circuit 1004. Control circuit 1004
Starts control of system when power is supplied.

When the control circuit 1004 starts operating, it is confirmed that the main switch 1001 is turned on (S7003). If it cannot be confirmed here that the main switch is turned on, the voltage detection unit 1003
Alternatively, error processing is performed as a failure of the main switch 1001 (S7004). If it is confirmed that the main switch 1001 is turned on, system initialization such as system operation confirmation and stabilization processing is performed (S7005). When the initialization is completed, the normal operation mode is entered (S7006). This mode is the main switch 10
It continues until 01 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 timing of turning off the main switch), a process for ending the system is performed (S
7008) AC switch 1002 when the processing is completed
Is turned off and the operation of the system is stopped (S70).
09).

(Embodiment 5) The hardware configuration of the power supply unit in this embodiment is the same as that in Embodiment 4.

FIG. 13 is a flow chart showing the operation of the fifth embodiment of the present invention.

First, the main switch 1001 is turned on to supply power to the apparatus. At this time, the AC switch 10
02 is turned on mechanically in synchronization with the main switch (S
7001).

As a result, the power supply 11 is supplied to the control circuit 1004.
00 supplies the necessary DC power, and the CPU 1004a
Starts to work. When the power is not supplied to the CPU 1004, the AC switch has failed (S8002, S8).
003).

The CPU 1004a supplied with power performs a predetermined initialization, and the apparatus can be operated while the main switch is on (S8004). This state is maintained until the voltage detection in the AC driver indicates that the main switch is turned off.

When the main switch is turned off, the voltage detection unit 1003 sends a signal indicating that the voltage detection is off to the CPU C
The PU recognizes that the main switch has been turned off (S
8005).

When the surface switch is turned on again within a predetermined time after the voltage detection indicates that the main switch is turned off, the CPU 1004a turns on the AC when the predetermined time elapses while the off state is shown. The switch is turned off (S8007). As a result, the supply of AC power can be stopped when not used for a long time such as at night, and energy can be saved.

If the power is turned off at this point, it means a normal shutdown (S8008). If the power does not turn off after the lapse of a predetermined time (S8009), it is determined that the AC switch has failed (S8010).

[0086]

According to the present invention, the AC power source is turned on and off.
By providing the first switching means for switching to F and the second switching means for switching the AC supply before and after the first switching means, the power consumption is large and the power is cut off for cooling the inside of the machine after the main switch is turned off. It is possible to save energy with a simple circuit configuration even for a device that cannot do this, or a device that requires waiting for reception in a copying machine with a fax machine.

Further, by providing the failure detection means capable of detecting the failure of the AC power supply path for each switching means, the failure location can be easily specified at the time of failure.

In particular, since the switching means for switching the AC power supply path to the front and rear of the main switch is provided with the failure detecting means for detecting a failure stuck to the front path, the failure location can be easily specified at the time of failure. be able to.

[Brief description of 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 related art description.

FIG. 3 is a cross-sectional configuration diagram showing an example of a mechanical configuration of the image forming apparatus of the present invention.

FIG. 4 is a hardware block diagram showing an example of a control system of the image forming apparatus of the present invention.

FIG. 5 is a schematic diagram showing an example of the arrangement configuration of an operation unit 600 provided in the main body 100.

FIG. 6 is a flowchart showing the operation of the control circuit according to the first embodiment of the present invention.

FIG. 7 is a flowchart showing error processing according to the first embodiment of the present invention.

FIG. 8 is a flowchart showing second error processing in the first embodiment of the present invention.

FIG. 9 is a flowchart showing the operation of the control circuit according to the second embodiment of the present invention.

FIG. 10 is a flowchart showing the operation of the control circuit according to the third embodiment of the present invention.

FIG. 11 is a hardware block diagram of a power supply unit according to the fourth embodiment of the present invention.

FIG. 12 is a block diagram showing an operation of a control circuit in a fourth embodiment of the image forming apparatus of the invention.

FIG. 13 is a flowchart showing the operation of the control circuit according to the fifth embodiment of the present invention.

[Explanation of symbols]

100 Copier Main Body 200 Circular Automatic Document Feeder or Feeder (RDF) 250 for Automatically Feeding Documents 250 Sorting Device or Sorter 101 Document Plate Glass as Document Plate 102 Optical System 103 as Image Reading Unit 103 Document Illumination Lamp ( Exposure lamp) 143 lens 104 motor 105 photoconductor drum 106 primary charger 107 blank exposure unit 108 potential sensor 109 developer 110 transfer charger 111 separation charger 112 cleaning device 113 main motor 114 upper cassette 115 lower cassette 116, 117 pickup Rollers 118 and 119 Paper feed roller 120 Registration roller 121 Conveyor belt 122 Fixer 123 Discharge roller 124 Deck 125 Lifter 126 Paper feed roller 127 Discharge flapper 128 Lower Feeding path 129 Reversing path 130 Re-feeding tray 131 Multiplex flapper 132 switching between double-sided recording and multiplex recording path 132 Paper feeding roller 133 Paper feeding path 134 Discharging roller 140 First feeding roller 142 Reversing roller 600 Operation unit 601 Asterisk (* ) Key 627 Cursor key 628 OK key 606 All reset key 602 Key to be pressed when returning from the all-shut-off state to the standard mode 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 Normal size key 616 Auto scaling key 626 Double-sided key 625 Binding margin key 624 Photo key 623 Multiplex key 620 Erasing document borders -621 Sheet erase key 629 Cover mode setting key 630 Page continuous shooting key 614 Staple sort, sort, group discharge method selection key 631 Reservation key 210 Reservation tray 632 Reservation setting key 633 Guide key 701 LCD that displays information related to copying (Liquid crystal) 603 Numeric keypad 608,609 Fixed size variable key 610 Same size 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 14 Fixing roller 303 High voltage controller 106 Primary charger 110 Transfer charger 109 Developer 304 High voltage unit 305 Motor controller 306 Motor 307 DC load controller 116 Pickup roller 308 Sensors for detecting paper jam of transfer paper 1000 AC driver 1100 Power supply 1002 Second switching means 1003 Switching operation detection for detecting switching operation of main SW 1005 Control system power supply 1006 Power supply and motor power supply that require precision 1007 door switch

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyoshi Triangle 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (22)

[Claims] 1. A first switching means for switching between an ON state and an OFF state of an AC power source, and a second switching means for switching between an AC power supply progress before and after the first switching means. Switching means, state detecting means for detecting the ON state or OFF state of the first switching means, and control means for switching the second switching means based on the state detected by the state detecting means. A power cutoff device characterized in that 2. The apparatus according to claim 1, further comprising failure detection means for detecting a failure of the second switching means.
The power cutoff device described in. 3. The power cutoff device according to claim 1, further comprising: a unit that detects a failure of the first switching unit and a unit that detects a failure of the state detection unit. . 4. The power cutoff device according to claim 1, wherein the second switching means is switched by turning on the first switching means. 5. The power source according to claim 1, wherein when the first switching means is turned off, the AC supply via the second switching means is maintained. Breaking device. 6. A blocking means for switching the second switching means to the subsequent path after the first switching means is turned off.
5. The power interruption device according to any one of 5 to 5. 7. The blocking means switches the second switching means to the subsequent path based on a lapse of a predetermined time after turning off the first switching means. Item 7. A power shutoff device according to item 6. 8. The failure detection unit detects a state in which the state detection unit is OFF, and the second switching unit switches the AC supply to a lapse of time after the first switching unit. 8. The power cutoff device according to claim 2, wherein when the power is not cut off within the time, it is determined that the second switching unit is out of order. 9. The storage means for storing the AC supply progress of the second switching means, and the storage means when the first switching means is in an ON state and AC power is supplied. And a means for determining that the second switching means is out of order when the read content does not indicate the progress of the second switching means after the first switching means. The power cutoff device according to any one of claims 2 to 7. 10. The failure information of the second switching means is stored when the state detecting means detects the OFF state of the first switching means, and the second switching means stores the failure information. 10. The failure information is erased when switched to the rear side of the.
The power cutoff device described in. 11. When the first switching means is in an ON state and the failure information is recorded when AC power is supplied, the failure detecting means determines that the second switching means has failed. 11. The power shutoff device according to claim 10, wherein it is determined that the power is cut off. 12. The failure detecting means has a storage means for storing a state of the second switching means, and when the first switching means is in an ON state and AC power is supplied, the failure detecting means stores the state in the storage means. The stored content indicates the subsequent AC supply progress, and when the state detecting means detects an OFF state, it is determined that the state detecting means is out of order. 7. The power interruption device according to any one of 7. 13. A means for detecting the use status of a forming apparatus which is operated by the AC power source, and a means for generating a switching signal for switching the first switching means to an OFF state when the apparatus is not used for a certain period of time. And the first switching means is turned on by the switching signal.
8. The power supply cutoff device according to claim 2, further comprising a means for setting a FF state. 14. When the first switching means is turned off by the automatic switching signal generating means and the state detecting means detects the off state, the second switching means is supplied with the AC power from the rear side. Switch to progress,
14. The power cutoff device according to claim 13, wherein if the power of the detection means does not turn off after a lapse of a certain time, it is determined that the first switching means is out of order. 15. When the first switching means is turned off by the switching signal generating means and the state detecting means detects the off state, the second switching means is turned on after the AC supply progresses. And storing the failure information of the state detecting means in the storage means, and determining that the first switching means has failed if the power supply of the detecting means does not turn off after a certain period of time. The power cutoff device according to claim 13. 16. The power shutoff device according to claim 1, wherein power is supplied to the state detecting means from the second switching means. 17. The state detecting means detects the state according to a voltage of a power source.
6. The power interruption device according to any one of 6. 18. The power cutoff device according to claim 1, wherein the second switching means is switched to the AC supply progress on the rear side immediately after the first switching means is turned on. 19. The power cutoff device according to claim 1, wherein after the state detecting means detects the ON state, the second switching means is switched to the AC supply progress on the front side. 20. The power interruption device according to claim 19, wherein the second switching means is switched to the AC supply progress of the front side after a lapse of a predetermined time after detecting the ON state. 21. The power cutoff device according to claim 19, wherein after the ON state is detected, the second switching means is switched to the AC supply progress of the front side based on other conditions. 22. An image forming apparatus comprising the power shutoff device according to any one of claims 1 to 21.