JPH08297443A - Image forming device and its power source control method - Google Patents

Abstract

PURPOSE: To prevent an image forming device from being transitioned to a dangerous state caused by an abnormality accompanying a power supply during a quiescent state and left in that state by detecting the abnormal state of the image forming device main body and changing over a switching means from a power supply state to a power-off state. CONSTITUTION: In the case that the power is supplied to an AC load to which the power supply has to be stopped due to a failure of an abnormality detecting circuit 404 for SSR 407 or a failure of a control circuit 403 for SSR 407 during a quiescent state programmed by a weekly timer, an abnormal detecting circuit 402 detects the abnormality and transmits the abnormal signal to a controller (a control circuit) 1004 and the controller 1004 switches off a main SW 1001, which completely turns off the power source. Also, when the abnormality detecting circuit 404 detects a failure of the SSR 407, the controller 1004 turns off the main SW 1001 and shut off the power supply completely. Further, when an abnormality detection circuit 406 detects the abnormalities such as that a failure of a control circuit 405 causes a motor to be in an energized state and the motor remains running on, the controller 1004 also turns off the main SW 1001 and shuts off the power supply completely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus having a timer function for automatically switching between a copy ready state and a rest state at a desired set time and a power supply control method for the image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, an electrophotographic copying machine has been known as one of image forming apparatuses having such a function. This is because by setting the weekly timer function, the user does not turn on / off the power switch.
This is done by automatically switching between the copy ready state and the idle state at the set time.

Therefore, when the weekly timer is operated, the power switch is turned on and used, and when the weekly timer is in an idle state, the control circuit and the like are supplied with the minimum necessary power and the others are supplied with power. It is controlled so that it is in the cutoff state.

[0004]

However, in the above-mentioned conventional example, since the power switch is turned on during the idle state by the weekly timer, some abnormality occurs in the circuit controlling the interruption of the power supply, and the load is reduced. There was a fear that the power would be supplied to.

Therefore, the heater is energized and the temperature rises, the motor is energized, the motor keeps rotating, the halogen lamp is energized, and an abnormality such as erroneous lighting occurs. There was a risk of a fire and other serious accidents occurring.

The present invention has been made to solve the above problems, and an object of the first to seventh inventions of the present invention is to suspend the main body of the image forming apparatus while the weekly timer is running. Abnormality detection is performed in the state, and the power supply state is cut off according to the abnormality detection, thereby reliably avoiding the risk associated with the occurrence of the abnormality in the image forming apparatus main body while the weekly timer is activated. An object of the present invention is to provide an image forming apparatus and a power supply control method for the image forming apparatus, which can significantly improve the safety of the image forming apparatus.

[0007]

A first aspect of the present invention is a control means for controlling an image forming sequence of an image forming apparatus main body, and a switch means for switching a power supply from a power supply means to a supply state or an interruption state. When the switch means is in a power supply state from the power supply means, power is supplied to the image forming apparatus main body and the control means at a desired set time and image formation is possible, and power is supplied to the control means. Is supplied to switch the image forming apparatus main body to one of the hibernation states and an abnormal state of the image forming apparatus main body is detected when the power management unit switches the image forming apparatus main body to the hibernation state. And a control means for switching the switch means from a power supply state to a power supply cutoff state based on a detection output of the abnormality detection means. It is.

According to a second aspect of the present invention, storage means for storing the content of the abnormality detection detected by the abnormality detection means,
Display means for displaying the content of the abnormality detection stored in the storage means when the power supply state from the power supply means is switched to the supply state by the switch means.

According to a third aspect of the present invention, an image forming apparatus main body is provided with a fixing means having a heating portion for fixing the developer transferred onto the recording medium at a predetermined temperature, and the abnormality detecting means is the above-mentioned. An abnormality in the fixing temperature of the fixing unit is detected.

According to a fourth aspect of the present invention, the main body of the image forming apparatus is provided with a fixing unit having a heating unit for fixing the developer transferred onto the recording medium at a predetermined temperature, and the abnormality detecting unit is It is intended to detect an abnormality of a switch section for switching between power supply and power cutoff from the power source to the heating section.

According to a fifth aspect of the present invention, the image forming apparatus main body is provided with an exposing means having an exposing portion for exposing the original image, and the abnormality detecting means detects an abnormality in the exposing portion.

According to a sixth aspect of the present invention, the main body of the image forming apparatus is provided with drive means for rotationally driving each part associated with image formation, and the abnormality detecting means detects an abnormality of the drive means.

A seventh aspect of the present invention relates to an image forming apparatus having a control means for controlling an image forming sequence of an image forming apparatus body and a switch means for switching a power supply from a power supply means to a supply state or a cutoff state. In the power source control method, when the switch means is in a power supply state from the power source means, a state in which power can be supplied to the image forming apparatus main body and the control means at a desired set time to form an image and the control means A power supply to the image forming apparatus main body to switch the image forming apparatus main body to one of the resting states, and the image forming apparatus main body is switched to the resting state.
The image forming apparatus main body includes an abnormality detecting step of detecting an abnormal state of the image forming apparatus main body, and a shutoff step of switching the switch means from a power supply state to a power shutoff state based on the abnormality detection output.

[0014]

In the first aspect of the invention, the control means detects the abnormal output of the image forming apparatus main body based on the detection output of the abnormality detecting means when the power management means switches the main body of the image forming apparatus to the idle state. The switch means is switched from the power supply state to the power supply cutoff state, and the image forming apparatus main body is left in a state in which it is in a dangerous state due to an abnormality due to power supply during a rest state, which may cause a serious accident. It is possible to reliably avoid such a situation.

In the second invention, when the switch means switches the power state from the power source means to the supply state, the display means displays the contents of the abnormality detection stored in the storage means for use. It is possible to clearly show to a person that there is some abnormality while the main body of the image forming apparatus is in a resting state, when the power is operated.

In a third aspect of the invention, when the power management means switches the image forming apparatus main body to the inactive state,
The control means switches the switch means from the power supply state to the power supply cutoff state based on the detection output of the abnormality detection means for detecting the fixing temperature abnormal state of the fixing means in the image forming apparatus body, and the image forming apparatus body is in the idle state. It is possible to reliably avoid a situation in which a serious accident is caused by being left in a dangerous state such as rapid heating due to an abnormality in the fixing means due to power supply.

In a fourth aspect of the invention, when the power management means switches the image forming apparatus main body to a resting state,
The control means switches the switch means from the power supply state to the power supply cutoff state based on the detection output of the abnormality detection means for detecting the abnormal state of the switch means in the image forming apparatus main body, and the image forming apparatus main body is in the idle state. It is possible to surely avoid a situation in which a serious accident is caused by being left in a power supply state due to an abnormality in the switch means accompanying power supply.

In a fifth aspect of the invention, when the power management means switches the image forming apparatus main body to a resting state,
The control unit switches the switch unit from the power supply state to the power supply cutoff state based on the detection output of the abnormality detection unit that detects the abnormal state of the exposure unit in the image forming apparatus main body, and the image forming apparatus main body is in the idle state. It is possible to surely avoid a situation in which a serious accident is caused by being left in a state of being erroneously turned on due to an abnormality in the exposure unit due to power supply.

In a sixth aspect of the invention, when the power management means switches the image forming apparatus main body to a resting state,
The control means switches the switch means from the power supply state to the power supply cutoff state based on the detection output of the abnormality detection means for detecting the abnormal rotation state of the drive means in the image forming apparatus body, and the image forming apparatus body is in the idle state. In addition, it is possible to reliably avoid a situation in which the drive means is left in a rotated state due to an abnormal rotation of the drive means and a serious accident is caused.

In the seventh invention, when the switch means is in the power supply state from the power supply means, the power can be supplied to the image forming apparatus main body and the control means at a desired set time to form an image. When the image forming apparatus main body is switched to one of the hibernation state by supplying power to the control means, the abnormal state of the image forming apparatus main body is detected, and the switch means is based on the abnormality detection output. Switch from the power supply state to the power supply cutoff state, and ensure that the image forming apparatus body is left in a dangerous state due to an abnormality due to power supply during the rest state and is left in a state causing a serious accident. It is possible to automate the process to avoid.

[0021]

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

FIG. 1 is a sectional view for explaining the structure of an image forming apparatus showing an embodiment of the present invention.

In FIG. 1, 100 is a copying apparatus main body (main body), 200 is a circulation type automatic document feeder or feeder (hereinafter referred to as RDF) for automatically feeding documents, 25
0 is a sorting device, that is, a sorter.
The 200 and the sorter 250 can be freely used in combination with the main body 100.

Reference numeral 101 denotes a document table glass as a document description table. Reference numeral 102 denotes an optical system as an image reading unit, which includes a document illumination lamp (exposure lamp) 103, a scanning mirror, a lens 143, a motor 104, and the like. The exposure lamp 10 scans with the motor 104.
The document is illuminated by 3 and the light reflected from the document 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 a main motor 113.
1 rotates in the direction of the arrow shown in FIG. 1 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 transfer paper sent from the upper cassette 114 or the lower cassette 115 through the pickup rollers 116 and 117 into the main body 100 by the paper feed rollers 118 and 119 is transferred to the front end of the toner image and the transfer paper by the registration roller 120. After being timed so that the front end of the toner image coincides with that of the toner image, 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 photosensitive drum 105 by the separation charger 111, and is fixed by the pressure and heat introduced to the fixing device 122 by the conveyance belt 121, and then the discharge roller 1
It is discharged to the outside of the main body 100 by 23. The surface of the photosensitive drum 105 is cleaned by the cleaning device 112.

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.

Reference numeral 127 denotes a paper discharge flapper, which switches the path between the double-sided recording side or the multiple recording side and the discharge side (sorter 250) to the return path side. 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. Further, reference numeral 128 denotes a lower conveyance path, which guides the transfer sheet sent from the discharge roller 123 to the re-feed tray 130 by reversing the transfer sheet via the reversing path 129.

Reference numeral 131 denotes a multiple flapper that switches between double-sided recording and multiple recording paths. By tilting this flapper to the left, the transfer paper is directly guided to the lower transport path 128 without passing through the reversing path 129. 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 in the vicinity of 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.
For double-sided recording (duplex copying) or multiplex recording (multiplex copying),
The paper discharge flapper 127 is raised and the copied transfer paper is stored in the re-feed tray 130 in a state of being turned upside down via the lower transport path 128 and the reverse path 129.

At this time, the double flapper 13 is used for double-sided recording.
1 is tilted to the right, and the multiple flapper 131 is tilted to the left during 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 via the path 133 by the sheet feeding roller 132 one by one from the bottom. When the transfer sheet is reversed and discharged from the main body, the discharge flapper 127 is raised and the multiple flapper 131 is tilted to the right, and the copied transfer sheet is conveyed to the conveying path 129 side, and the rear end of the transfer sheet is After passing through the first feed roller 140, the reversing roller 142 conveys the transfer paper to the second feed roller side, and the discharge roller 134 reverses the transfer paper and discharges it outside the machine. Note that 144 is a fixing roller, 150 is a multi-bypass tray, and 210 is a reservation tray.

FIG. 2 is a plan view of relevant parts showing the arrangement of the operating section 600 provided in the main body 100 shown in FIG.

In FIG. 2, a weekly timer key 650 is used to set / cancel the weekly timer operation. A weekly timer setting key 651 is used as an enter key when setting the operation time of the weekly timer.

Reference numeral 601 denotes an asterisk (*) key,
It is used by the operator (user) in the setting mode such as the binding margin amount setting or the document frame erasing size setting. 627
Is a cursor key and is used when selecting 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 606 is also pressed when returning from the auto shutoff state to the standard mode. 60
Reference numeral 5 denotes a copy start key (copy start key), which is pressed when copying is started. A clear / stop key 604 functions as a clear key during standby (standby) and as a stop key during copy recording. This clear key is also used to cancel the set number of copies. The stop key is pressed when interrupting continuous copying.

After the copying at the time of pressing this is completed, the copying operation is stopped. Reference numeral 603 is a ten-key pad, which is pressed to set the number of copies. Also used when setting * (asterisk) mode. A memory key 619 allows the user to register modes that are frequently used. Here, four modes M1 to M4 can be registered. Copy density keys 611 and 612 are pressed to manually adjust the copy density. 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).

Reference numeral 607 denotes a copy paper selection key, which is an upper cassette 114, a lower cassette 115, a deck 124,
Pressed when selecting the multi-bypass tray 150. When a document is placed on the RDF 200, 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.

Reference numeral 610 denotes a unity size key, which is pressed to make a copy at the same size (actual size). An automatic scaling key 616 is pressed to automatically reduce or enlarge the image of the original according to the designated transfer 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.

Reference numeral 624 is a photographic key, which is pressed when copying a photographic original. A multiple key 623 is pressed when creating (combining) images from the two originals on the same surface of the transfer paper. An original frame erasing key 620 is pressed when the user erases the frame of a standard size original document, and the size of the original document is set by the asterisk key 601 at that time. A sheet frame erasing key 621 is pressed to erase the frame of the original according to the copy paper size. Reference numeral 629 is a cover mode setting key, which is used when the front and back covers are created and a slip sheet is inserted.

A page continuous copy key 630 is used to continuously copy the left and right pages of a two-page spread book. Numeral 614 is a paper ejection method selection key for selecting the paper ejection method of the staple sort group, and if the stapled sorter is connected to the paper after recording, the staple sort mode, the sort mode, or the group mode is selected or selected. The 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.

Reference numeral 701 is an LC for displaying information regarding copying.
It is a D (liquid crystal) type message display, 9
Characters and figures are displayed with 6 × 192 dots. For example, the weekly timer setting time set by the weekly timer setting key 651, the number of copies set by the ten keys 603,
Standard scaling keys 608, 609, equal magnification key 610, zoom magnification set by zoom keys 617, 618, paper size selected by paper selection key 607, message indicating status of copying apparatus main body 100, guide message indicating operation procedure, Displays the setting contents of other various modes. 6
15 is a folding key, 634 is an interrupt key, and 635 is an ID.
Is the key.

Reference numeral 704 denotes an AE 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 the RDF 200 is used in the standard mode, the number of copies is 1, the density AE mode, automatic paper selection, normal size, single-sided copy to single-sided copy are set. RDF
In the standard mode when the 200 is not used, the number of copies is 1, the density manual mode is set, and the setting is set to single-sided copying from a single-sided original. 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.

FIG. 3 is a block diagram for explaining the control configuration of the image forming apparatus shown in FIG. 1. The same parts as those in FIG. 1 are designated by the same reference numerals.

In the figure, reference numeral 1004 denotes a control circuit (controller), which includes a CPU 1004a, a ROM 1004b, and an R.
It is composed of an AM 1004c and the like, and controls the copy sequence as a whole based on a program stored in the ROM 1004b. In addition, the battery 1004d causes the power source 1100
RAM1004c even when the power supply from the
The content of is retained.

As described above, the operation section 600 includes a copy mode (single-sided / double-sided / multiplexed mode, copy magnification, cassette selection, etc.) setting key, a ten-key for setting the number of copies, a start key for instructing the start of copying operation, A stop key for instructing to stop the copying operation, a reset key for returning the operation mode to the standard state, a key input section such as a weekly timer setting key, and an LED for displaying the operation mode setting state, etc.
-A display part such as a liquid crystal is arranged.

The thermistor 302 detects the surface temperature of the fixing roller 144, and the value A / D converted by the A / D converter 301 is input to the controller 1004. The controller 1004 controls the surface temperature of the fixing roller 144 to a predetermined value based on the detection value of the thermistor 302.

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 driving of a motor 306 such as various stepping motors and a main drive motor.

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 fans.

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 controls the AC power supply to the AC load 309 such as the original illumination lamp 103 and the fixing heater 310. Further, the document illumination lamp 10
3. The abnormality of the fixing heater 310 or the like is detected, and the main switch 1001 with a shutoff 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 and the like, the AC power from the AC driver 1000 is input, and the AC power via the main switch 1001 and the door switch 1007 is input to the power supply 1100 from the input power plug 311. To be done.

The paper deck 124 is a sheet feeding device for increasing the number of transfer sheets to be stacked, the feeder 200 is an automatic document feeding device for automatically setting a plurality of documents, and the sorter 250 is a transfer device for discharging. A sorting device for sorting paper. Reference numeral 1200 is a calendar IC.

FIG. 4 is a circuit block diagram for explaining the structure of the power supply section shown in FIG. 3, and the same parts as those in FIG. 3 are designated by the same reference numerals.

In FIG. 4, reference numeral 1001 denotes a men switch, which is a switch means for switching between power supply and cutoff, and 1020 denotes a power supply maintenance for maintaining the power supply to the control means even when the main switch is switched to the power cutoff state. Reference numeral 1003 is a detection means for detecting the switching operation of the main switch, and 1004 is a control circuit for controlling the switching of the relay 1002 according to the state of the main switch 1001. The power supply 1100 is roughly composed of two systems, 1005 is a 5V system which is a control system power supply for driving the control circuit 1004 and the like, and a 24VU power supply which drives a clutch solenoid and the like, and 1006 is a 24VR for an analog signal requiring high voltage and accuracy. And a 38VU power supply for the main and optical motors. 1007 is a door switch.

Next, the operation of relay 1002 shown in FIG. 4 will be described.

When the relay 1002 is in the uncontrolled state, it is shown in FIG.
When the main switch 1001 is turned on, the commercial power source 1008 is supplied to the power source 1005, and the control circuit 1004 starts operating. Control circuit 10
When the operation of 04 is started, it controls the relay 1002 to switch the relay 1002 to the dotted line side. Relay 10
When 02 is switched to the dotted line side, the commercial power supply 1008 is always supplied to the power supply 1005 regardless of the state of the main switch, and power can be supplied to the control circuit 1004.

The control circuit 1004 uses the relay 1 if necessary.
By releasing the control of 002, the supply of the commercial power source 1008 to the power source 1005 is cut off, and the control circuit 1004
The power supply to the main switch is also cut off, and then the main switch 1
When 001 is turned on, the operation is restarted.

FIG. 5 is a block diagram for explaining the abnormality detecting mechanism of the image forming apparatus according to the present invention. The same parts as those in FIGS. 3 and 4 are designated by the same reference numerals.

In FIG. 5, reference numeral 408 denotes an AC load, which is, for example, a fixing heater, a drum heater, a halogen lamp or the like. The control circuit 401 is separately provided for each AC load and controls each.

An abnormality detection circuit 402 is provided separately for each AC load and detects each abnormality.

Reference numeral 407 denotes an SSR, which is provided for each AC load and is controlled by the control circuit 403 to switch between a power supply state and a cutoff state for the AC load. Abnormality detection circuit 4
04 is separately provided for each SSR and detects each abnormality. The motor 306 is controlled by the control circuit 405, and the abnormality detection circuit 406 detects an abnormality.

Next, the principle of operation when an abnormality is detected will be described.

During the sleep state by the weekly timer, S
Failure of SR abnormality detection circuit 404, SSR control circuit 4
When power is supplied to the AC load whose power supply should be cut off due to the failure of 03, the abnormality detection circuit 402 detects an abnormality and outputs an abnormality signal to the controller (control circuit) 100.
4 and the controller 1004 sends the main SW100
Turn off 1 to completely cut off the power supply.

Abnormality detection circuit 404 for failure of SSR 407
When the signal is detected, an abnormal signal is transmitted to the controller, and the controller 1004 turns off the main SW 1001 to completely cut off the power supply.

Even when the abnormality detection circuit 406 detects an abnormality in the state in which the motor is energized due to a failure of the control circuit 405 and the motor keeps rotating, an abnormality signal is output to the controller 10.
04, and the controller 1004 sends the main SW10.
01 is turned off and the power supply is completely cut off.

In addition, when the controller runs out of control, the abnormality detection circuits 402, 404 and 406 directly output the main S signal.
W1001 can be turned off.

Correspondence between the present embodiment and each means of the first to sixth inventions and their functions will be described below with reference to FIG.

The first invention is a control means (control circuit 1004) for controlling the image forming sequence of the main body of the image forming apparatus.
And switch means (main switch 1001) for switching the power from the power supply means to a supply state or a cutoff state,
When the switch means is in a power supply state from the power supply means, power is supplied to the image forming apparatus main body and the control means at a desired set time and image formation is possible and power is supplied to the control means. A power supply management unit (depending on the function of the control circuit 1004) that supplies the image forming apparatus main body to one of the hibernation states, and the image forming unit when the power management unit switches the image forming apparatus main body to the hibernation state. An abnormality detection unit (abnormality detection circuits 402, 404, 406) for detecting an abnormal state of the apparatus main body, and the switch unit (main switch 1001) from the power supply state to the power supply cutoff state based on the detection output of the abnormality detection unit. Control means for switching (control circuits 401, 403, 40
5) and each control circuit 40 when the control circuit 1004 switches the image forming apparatus main body to the rest state.
1, 403 and 405 respectively detect abnormality states of the main body of the image forming apparatus.
Based on the detection output of 04, 406, the main switch 10
01 is switched from the power supply state to the power supply cutoff state, and the image forming apparatus main body is left in a state in which it is in a dangerous state due to an abnormality due to power supply during the rest state, which causes a serious accident. It is possible to avoid it without fail.

In the second invention, when the main switch 1001 switches the power state from the power source 1100 to the supply state, the contents of the abnormality detection stored in the storage unit (RAM 1004c) are displayed on the display unit (operation unit). 600
It is possible to clearly indicate to the user that there is any abnormality while the image forming apparatus main body is in a resting state when the power supply is operated.

The third invention is a power management means (control circuit 1
004) when the image forming apparatus main body is switched to the rest state, the control circuit 403 detects the abnormal fixing temperature of the fixing heater 310 in the main body of the image forming apparatus based on the detection output of the abnormality detecting means. 1001
Is switched from the power supply state to the power supply cutoff state, and the image forming apparatus body is left in a state where it is in a dangerous state such as rapid heating due to an abnormality in the fixing means accompanying the power supply while the image forming apparatus main body is in a rest state, causing a serious accident. It is possible to reliably avoid such a situation.

A fourth invention is a power management means (control circuit 1
(004) when the image forming apparatus main body is switched to the rest state, the control means (control circuit 403) detects an abnormal state of the SSR 407 in the image forming apparatus main body by the abnormality detecting means (abnormality detecting circuit 404). Based on the output, the main switch 1001 is switched from the power supply state to the power supply cutoff state, and the image forming apparatus main body is left in the power supply state due to the abnormality of the SSR 407 accompanying the power supply while the image forming apparatus main body is in the idle state, which causes a serious accident. It is possible to reliably avoid such a situation.

A fifth aspect of the invention is a power management means (control circuit 1
Control unit (control circuit 403) detects an abnormal state of the exposure unit in the image forming apparatus body when the image forming apparatus body is switched to the rest state. Based on the detection output, the switch means is switched from the power supply state to the power supply cutoff state, and when the image forming apparatus main body is in the idle state, the image forming apparatus main body is left erroneously turned on due to an abnormality of the exposure means associated with the power supply and a serious accident occurs. It is possible to reliably avoid a situation that invites you.

A sixth aspect of the invention is a power management means (control circuit 1
(004) when the image forming apparatus body is switched to the rest state, the control means (control circuit 401) detects an abnormal rotation state of the drive means (motor 306) in the image forming apparatus body. Based on the detection output of the detection circuit 406), the switch means is switched from the power-supply state to the power-off state, and the image forming apparatus main body is left in a rotated state due to an abnormal rotation of the drive means accompanying the power supply during the rest state. It is possible to reliably avoid a situation that would lead to a serious accident.

The power supply control method for the image forming apparatus according to the present invention will be described below with reference to FIGS.

FIG. 6 is a flow chart showing an example of sequence control procedure of the controller of the image forming apparatus according to the present invention. Note that (1) to (7) indicate each step.

Power is supplied to the controller 1004 (ST
ART), the controller 1004 clears the work area of the RAM 1004c and sets the I / O port.
(1), turn on the relay 1002,
The relay 1002 is switched to the dotted line side in FIG. 4 (2).

Next, it is checked whether or not an error flag described later is recorded (set) in the backup area of the RAM 1004c (3), and if it is set,
The error information stored in the backup area of the RAM 1004c is displayed on the LCD 701 of the operation unit 600 (6) and the error flag is reset (7). If the error flag is not stored (set) in the judgment of step (3), the main switch off flag is reset (4), the main switch detection timer interrupt described later is started (5), and the main routine described later is executed. To jump.

FIG. 7 is a flow chart for explaining the procedure of the main routine of the image forming apparatus according to the present invention. Note that (11) to (17) indicate each step.

After performing the initialization operation for starting up the main body 100 such as the start of temperature control of the fixing heater 310 and the cleaning operation of the photosensitive drum 105 (11), it is checked whether the main switch off flag is set. (12) If set, jump to a shutdown routine described later.

On the other hand, if it is determined in step (12) that it has not been set, the weekly timer key 65
It is checked whether 0 is turned on (13), and if it is not turned on, it is checked whether copying is possible (15), such as completion of temperature control of the fixing heater 310 and existence of copy paper. When the copy key 605 is pressed in the state (16), the copying operation is performed (17), and after the copying operation is completed, the process jumps to (12).

On the other hand, if it is determined in step (13) that the weekly timer key 650 is turned on, it is determined whether the off time is set by the weekly timer setting key 651 (14), and the off time is determined. If not, proceed to step (15).

On the other hand, in step (14), when it is determined that the off time is reached, the routine jumps to a rest routine described later.

Although not shown, step (1
Check whether the main switch-off flag is set also during execution of 1) and step (17),
When set, it jumps to the shutdown routine described later.

FIG. 8 is a flow chart showing an example of detailed procedures of the shutdown routine shown in FIG. Note that (21) to (24) indicate each step.

First, the main switch is turned off (21),
A power-off timer for completely powering off after a predetermined time starts counting (22), and it is checked whether or not the power-off tie has counted up (23). When it counts up, the relay is turned off and the relay 10
02 is switched to the solid line side in FIG. 4 (24) to completely cut off the power supply.

During the execution of step (23), it is checked whether or not the main switch-off flag is set (not shown), and if it is reset, the main routine is jumped to.

FIG. 9 is a flow chart showing an example of the detailed procedure of the pause routine by the weekly timer shown in FIG. Note that (31) to (37) indicate each step.

First, after controlling the temperature of the fixing heater 310, stopping the motor drive, etc., and performing a pause operation (31) for supplying the minimum necessary power to the abnormality detection circuit, etc., the main switch off flag is turned on. It is checked whether or not it is set (32), and when it is set, the weekly timer key is turned off (35), and the process jumps to the shutdown routine.

On the other hand, if it is determined in step (32) that the main switch-off flag is not set, then FIG.
The abnormality detection described in (3) is performed (33). If an abnormality is detected, an error flag is set in the backup area of the RAM 1004C (36), and error information is stored. Then, the main switch relay is turned off (3
7).

On the other hand, if no abnormality is detected in step (33), the weekly timer setting key 651 is set.
It is determined whether the on-time is set by (34), and if it is not the on-time, the process jumps to step (32).

On the other hand, if it is determined in step (34) that it is the on-time, the process jumps to the main routine.

FIG. 10 is a flowchart showing an example of a main switch detection timer interrupt processing procedure in the image forming apparatus according to the present invention. Note that (41) to (43)
Indicates each step. In this embodiment, 2 m
The main switch is detected by an interval timer that is interrupted every sec.

First, the main switch detection means 1003
Thus, it is checked whether the main switch is in the ON state (41). When the main switch is in the ON state, the main switch OFF flag is reset and the process ends.

On the other hand, if it is determined in step (41) that the switch is not in the on state, the main switch off flag is set (42) and the process is terminated.

Correspondence between the present embodiment and each step of the seventh invention and its action will be described below with reference to FIGS.

The seventh invention is a control means (control circuit 1004) for controlling the image forming sequence of the main body of the image forming apparatus.
And a switch means (main switch 1001) for switching the power supply from the power supply means to a supply state or a cutoff state, in the power supply control method of the image forming apparatus, when the switch means is in the supply state from the power supply means,
A pause in which power is supplied to the image forming apparatus main body and the control unit at a desired set time to form an image, and power is supplied to the control unit to switch the image forming apparatus main body to a pause state. Process (Step (3 in FIG. 9
1)), and an abnormality detection step (step (33) in FIG. 9) of detecting an abnormal state of the image forming apparatus main body when the image forming apparatus main body is switched to the rest state, and based on the abnormality detection output. And an interruption process (steps (36) and (37) in FIG. 9) for switching the switch means from the power supply state to the power supply interruption state. It is possible to automate a process for surely avoiding a situation in which a serious accident is caused by being left in a dangerous state.

In the above embodiment, the image forming apparatus for executing the electrophotographic process is taken as an example, but the present invention can be applied to various printing apparatuses.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. Further, it goes without saying that the present invention can be applied to the case where it is achieved by supplying a program to a system or an apparatus.

[0101]

As described above, the first aspect of the present invention
According to the invention, the switch means is based on the detection output of the abnormality detection means for detecting the abnormal state of the image forming apparatus main body when the power management means switches the image forming apparatus main body to the idle state. Since the power supply is switched from the power supply state to the power supply cutoff state, a situation may occur in which the image forming apparatus body is left in a dangerous state due to an abnormality due to power supply during the rest state and causes a serious accident. It can be avoided without fail.

According to the second invention, the display means displays the content of the abnormality detection stored in the storage means when the power supply state from the power supply means is switched to the supply state by the switch means. It is possible to clearly indicate to the user that there is any abnormality while the image forming apparatus main body is in the resting state when the power is operated.

According to the third aspect of the present invention, when the power management means switches the image forming apparatus body to the rest state, the control means detects an abnormal fixing temperature state of the fixing means in the image forming apparatus body. Since the switch means is switched from the power supply state to the power supply cutoff state based on the detection output of the detection means, a sudden heating or other dangerous state may occur due to the abnormality of the fixing means accompanying the power supply while the image forming apparatus main body is in the idle state. It is possible to reliably avoid a situation where a transitional state is left and a serious accident is caused.

According to the fourth aspect of the invention, the abnormality detecting means for detecting the abnormal state of the switch means in the image forming apparatus main body when the power management means switches the image forming apparatus main body to the idle state. Since the switch means is switched from the power supply state to the power supply cutoff state based on the detection output of, the image forming apparatus main body is left in the power supply state due to an abnormality of the switch means accompanying the power supply while the image forming apparatus main body is in the hibernation state, and a serious accident occurs. It is possible to surely avoid a situation that invites you.

According to the fifth aspect of the invention, when the power management means switches the image forming apparatus main body to the rest state, the control means detects the abnormal state of the exposure means in the image forming apparatus main body. Since the switch means is switched from the power supply state to the power supply cutoff state based on the detection output of, the image forming apparatus main body is left in an erroneously lit state due to an abnormality of the exposure means due to the power supply during the rest state and is serious. It is possible to surely avoid a situation that causes an accident.

According to the sixth aspect of the present invention, when the power management means switches the image forming apparatus body to the rest state, the control means detects an abnormal rotation state of the driving means in the image forming apparatus body. Since the switch means is switched from the power supply state to the power supply cutoff state based on the detection output of the means, the image forming apparatus main body is left in a rotated state due to an abnormal rotation of the drive means due to the power supply during the rest state and is serious. It is possible to reliably avoid a situation that would cause a serious accident.

According to the seventh aspect, when the switch means is in the power supply state from the power supply means, power can be supplied to the image forming apparatus main body and the control means at a desired set time to form an image. State and the control means is supplied with power to switch the image forming apparatus main body to one of the hibernation state and an abnormal state of the image forming apparatus main body is detected, and the switch is detected based on the abnormality detection output. Since the means is switched from the power supply state to the power supply cutoff state, the image forming apparatus body may be left in a dangerous state due to an abnormality due to power supply during the rest state, resulting in a serious accident. It is possible to automate the processing for surely avoiding.

Therefore, it is possible to surely avoid the danger caused by the occurrence of an abnormality in the main body of the image forming apparatus while the weekly timer is activated, and to improve the safety of the image forming apparatus remarkably.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating a configuration of an image forming apparatus according to an exemplary embodiment of the present invention.

FIG. 2 is a plan view of relevant parts showing the arrangement configuration of an operation unit provided in the main body shown in FIG.

3 is a block diagram illustrating a control configuration of the image forming apparatus illustrated in FIG.

FIG. 4 is a circuit block diagram illustrating the configuration of the power supply unit shown in FIG.

FIG. 5 is a block diagram illustrating an abnormality detection mechanism of the image forming apparatus according to the present invention.

FIG. 6 is a flowchart showing an example of a sequence control procedure of the controller of the image forming apparatus according to the present invention.

FIG. 7 is a flowchart illustrating a procedure of a main routine of the image forming apparatus according to the present invention.

8 is a flowchart showing an example of detailed procedures of a shutdown routine shown in FIG.

9 is a flowchart showing an example of a detailed procedure of a pause routine by the weekly timer shown in FIG.

FIG. 10 is a flowchart showing an example of a main switch detection timer interrupt processing procedure in the image forming apparatus according to the present invention.

[Explanation of symbols]

 401 Control Circuit 402 Abnormality Detection Circuit 403 Control Circuit 404 Abnormality Detection Circuit 405 Control Circuit 406 Abnormality Detection Circuit 407 SSR 408 AC Load 1000 AC Driver 1001 Main SW 1002 Relay 1004 Controller 1100 Power Supply

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location B41J 29/46 B41J 29/46 G (72) Inventor Tetsuya Nozaki 3-30 Shimomaruko, Ota-ku, Tokyo No. 2 Canon Inc. (72) Inventor Akihiko Sato 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Yoshihiro Funamizu 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Non Inc. (72) Inventor Kazuhiko Hirooka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (7)

[Claims] 1. A control means for controlling an image forming sequence of an image forming apparatus main body, a switch means for switching a power supply from a power supply means to a supply state or a cutoff state, and a switch means for supplying power from the power supply means. At the time of
A power supply that supplies power to the image forming apparatus main body and the control unit at a desired set time to enable image formation and to supply power to the control unit to switch the image forming apparatus main body to a hibernation state. Management means, abnormality detection means for detecting an abnormal state of the image forming apparatus main body when the power supply management means switches the image forming apparatus main body to a hibernation state, and the abnormality detection means based on the detection output of the abnormality detection means. An image forming apparatus comprising: a control unit that switches the power supply state from a power supply state to a power supply cutoff state. 2. The storage means for storing the content of the abnormality detection detected by the abnormality detection means, and the storage means stored when the power supply state from the power supply means is switched to the supply state by the switch means. A display unit for displaying the content of the abnormality detection is provided.
The image forming apparatus described. 3. The image forming apparatus main body comprises a fixing unit having a heating unit for fixing the developer transferred to the recording medium at a predetermined temperature, and the abnormality detecting unit detects an abnormality in the fixing temperature of the fixing unit. The image forming apparatus according to claim 1, wherein the image forming apparatus comprises: 4. The image forming apparatus main body includes a fixing unit having a heating unit for fixing the developer transferred to the recording medium at a predetermined temperature, and the abnormality detecting unit is provided from the power source to the heating unit. The image forming apparatus according to claim 1, wherein an abnormality of a switch unit that switches between power supply and power cutoff is detected. 5. The image forming apparatus main body is provided with an exposure unit having an exposure unit that exposes a document image, and the abnormality detection unit detects an abnormality in the exposure unit.
The image forming apparatus described. 6. The image forming apparatus according to claim 1, wherein the image forming apparatus main body includes a driving unit that rotationally drives each unit associated with image formation, and the abnormality detecting unit detects an abnormality of the driving unit. apparatus. 7. A power supply control method for an image forming apparatus, comprising a control means for controlling an image forming sequence of an image forming apparatus main body and a switch means for switching a power supply from a power supply means to a supply state or a cutoff state. When the power supply from the power supply means is in the supply state, the power is supplied to the image forming apparatus main body and the control means at a desired set time to supply the power to the image formation state and the control means. A pause step of switching the image forming apparatus main body to one of the pause states, an abnormality detection step of detecting an abnormal state of the image forming apparatus main body when the image forming apparatus main body is switched to the pause state, and the abnormality detection output A power-off step for switching the switch means from a power-supply state to a power-off state based on Way.