JPH0222674A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent a memory for a program from becoming too large and the frequent occurrence of program error by providing a power switch monitoring means, which detects a power source switch being open and makes the control part in a pseudo abnormal condition. CONSTITUTION:The device is started after the CPU is connected to the power source and the reset is finished. Next, all outputting ports are turned off, and after the initialization of RAM has been carried out, ON/OFF of the power source switch 712 is checked. When the power source switch 712 is detected to be OFF (ON), the control part is put in a pseudo abnormal condition, this is detected by a watchdog circuit 812 and oscillation of watchdog pulse is stopped, a reset signal is forcibly generated by the watchdog 812, and CPUs 814 and 801 are initialized in the same way is when the power source is connected to the control part. Thus, the open state of the power switch and increase in the memory for processing of detection of abnormality of device in a program, or the frequent occurrence of program errors can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an image forming apparatus such as a copying machine, a printer, etc.
In particular, it relates to the generation of the reset signal.

(Prior art) Conventionally, in this type of device, the power switch that opens and closes the power supply of load parts other than the control part is
(Open) is detected by the control unit, and the program is configured to process this in the same way as the process of turning on the control unit power supply.

Furthermore, the program is configured to process the detected abnormality of the device using the program.

(This is what the invention is trying to solve!) As mentioned above, in conventional devices, since the opening of the power switch and the detection of abnormality in the device are processed by the program, the memory for the program increases or The problem was that programming errors were easy to occur.

The present invention has been made in order to solve such problems. , the image forming device is
1) and (2).

(1) A power switch that opens and closes the power supply for load parts other than the control unit, a control unit monitoring means that detects abnormalities in the control unit and supplies reset signals to required locations, and a power switch that detects when the power switch is opened. and a power switch monitoring means for detecting this and putting the control unit into a pseudo abnormal state.

(2) Includes a control unit monitoring means that detects an abnormality in the control unit and supplies a reset signal to a required location, and a program monitoring unit that detects an abnormality in the device on the program and puts the control unit in a pseudo abnormal state. do it like this.

(Function) With the configuration (1) above, the opening of the power switch is transmitted to the control unit monitoring means, and a reset signal is supplied to the required locations.

Furthermore, with the configuration (2) above, any abnormality in the device on the program is communicated to the control unit monitoring means, and a reset signal is supplied to the required location.

(Example〕 The present invention will be explained below with reference to Examples.

FIG. 1 shows the structure of a "copying machine" which is a first embodiment of the present invention.
2 is a flowchart of power supply monitoring in the same embodiment, FIG. 3 is a mechanical diagram of the same embodiment, and FIG. 4 is a layout diagram of the operation panel of the same embodiment. The explanation will begin with the mechanism, the main parts of which are shown in FIGS. 1 and 2.

In Fig. 3, 100 is a main unit that has an image reading function and an image recording function, and 200 is a double-sided processing function that turns the recording medium (paper) over during double-sided recording, and performs multiple recordings on the same recording medium. 300 is a circulating document feeder (hereinafter referred to as RDF) that automatically feeds originals, 400 is a sorter, and each of these devices 200 to 400 is a main unit. 1
00 can be freely combined and used.

A1 main body (100) In the main body 100, 101 is where the original is placed w, 8!
103 is an illumination lamp (exposure lamp) that illuminates the original; 105, 107, and 109 are scanning reflecting mirrors (scanning mirrors) that change the optical path of the reflected light of the RM;
Reference numeral 111 is a lens having focusing and variable magnification functions, and reference numeral 113 is a fourth reflection mirror (scanning mirror) that changes the optical path. 115 is an optical system motor that drives the optical system, 117,1
Reference numeral 21 denotes an image tip sensor and a home sensor.

131 is a photosensitive drum, 133 is a main motor that drives the photosensitive drum 131, 135 is a high pressure unit, and 170 is a 2
．． A blank exposure unit in which LEDs are arranged at a pitch of 5 mm, 171 is a potential sensor for measuring the potential of the photosensitive drum 131, 172 is a color developer, and 173 is a black developer, both of which can be used as step-parents. 141 is a transfer charger, 1
43 is a separation charger, and 145 is a cleaning device.

176, 177, and 178 are document size detection sensors that detect the presence or absence of a document placed on the document platen glass;
Reference numeral 9 denotes a sensor that detects the immediate closing of the RDF or a pressure plate (not shown).

151 is the upper cassette, 153 is the lower cassette, 155
157 is a paper feed roller, and 159 is a registration roller. Further, 161 is a conveyor belt that conveys the recording paper on which an image has been recorded to the fixing side, 163 is a fixing device that fixes the conveyed recording paper by thermocompression bonding, and 167 is a sensor used for double-sided recording.

The surface of the photosensitive drum 131 described above is made of a seamless photoconductor using a photoconductor and an electric conductor. The motor 133 starts rotating in the direction of the arrow shown. Next, when the predetermined rotational control and potential control processing (preprocessing) of the drum 131 are completed, the original placed on the original platen glass 101 is illuminated by the illumination lamp 103 that is integrated with the first scanning mirror 105. The reflected light from the original is transmitted to the first scanning mirror 105 and the second scanning mirror 105.
Scanning mirror 107, third scanning mirror 109, lens 11
1 and a fourth scanning mirror 113 to form an image on the drum 131.

The drum 131 is corona charged by a high pressure unit 135. After that, the image illuminated by the illumination lamp 103 (
The original image) is exposed to slit light, and an electrostatic latent image is formed on the drum 131 using the known Carlson method.

Next, the electrostatic latent image on the photosensitive drum 131 is transferred to a developing device 172.
Alternatively, it is developed by developing rollers 174 and 175 of 173 and visualized as a toner image, and the toner image is transferred onto transfer paper by a transfer charger 141 as described later.

The transfer paper in the upper cassette 151 or lower cassette 153 is fed into the main unit by a paper feed roller 155 or 157, and is sent toward the photosensitive drum 131 with precise timing by a registration roller 159, so that the leading edge of the latent image and the transfer paper Match the tip of the Thereafter, the transfer paper passes between the transfer charger 141 and the drum 131, so that the toner image on the drum 131 is transferred onto the transfer paper. After this transfer is completed, the transfer paper is separated from the drum 131 by a separation charger 143, guided to a fixing device 163 by a conveyor belt 161, fixed by pressure and heat, and then discharged to the outside of the main body 100 by a discharge roller 165. be done.

After the transfer, the drum 131 continues to rotate, and its surface is cleaned by a cleaning device 145 composed of a cleaning roller and an elastic blade.

B. Bedistal (200) The bedestal 200 can be separated from the main body 100 and includes a deck 201 capable of storing 2000 sheets of transfer paper and an intermediate tray 203 for double-sided copying. Also, the lifter 2 of the deck 201 that can store 2000 sheets.
05 rises according to the amount of transfer paper so that the transfer paper always comes into contact with the paper feed roller 207.

Further, 211 is a paper discharge flapper that switches the path between the double-sided recording side or multiplex recording side and the discharge side path, and 213, 2
Reference numeral 15 denotes a conveyance path of a conveyor belt, 217 denotes an intermediate tray weight for holding down the transfer paper, and the transfer paper that has passed through the paper ejection flapper 211 and the conveyance path 213° 215 is turned over and stored in the intermediate tray 203 for double-sided copying. Ru. 219 is a multiple flapper that switches the path between double-sided recording and multiplex recording,
It is disposed between the conveyance paths 213 and 215, and guides the transfer paper to the multiplex recording conveyance path 221 by rotating upward. 2
Reference numeral 23 denotes a multiple paper discharge sensor that detects the end of the transfer paper passing through the multiple flapper 219. A paper feed roller 225 feeds the transfer paper to the drum 131 through a path 227. 229 is a discharge roller that discharges the transfer paper to the outside of the machine.

During double-sided recording (double-sided copying) or multiplex recording (multiple overlapping copying), first raise the paper ejection flapper 211 of the main body 100 upwards and move the copied transfer paper to the conveyance path 213 of the bediskle 200.
, 215, and stored in the intermediate tray 203. At this time, the multiplex flapper 219 is lowered during double-sided recording.
At the time of multiplex recording, the multiplex flapper 219 is raised. This intermediate tray 203 can store up to 99 sheets of transfer paper, for example. The transfer paper stored in the intermediate tray 203 is pressed down by an intermediate tray weight 217.

During the next back-side recording or multiplex recording, the transfer paper stored in the intermediate tray 203 is moved one by one from the bottom to the path 2 by the action of the paper feed roller 225 and the weight 217.
27 to the registration rollers 159 of the main body 100.

C, RDF (circulating document feeder) (300) RDF3
00, reference numeral 301 is a stacking tray on which a document bundle 302 is set. First, when a single-sided document is used, a half-moon roller 304 and a separating roller 303 separate the documents one by one from the bottom of the document bundle. The sheet is conveyed to the exposure position of the platen glass 101 via buses 1 to 3, and is stopped, and the copying operation is started. After the copying is completed, the sheet is sent to the bus V by the large transport roller 307 via the path (2), and then returned to the upper surface of the document bundle 302 by the sheet discharge roller 308. 309 is a recycle lever (which detects circulation of originals) Jj
; is placed on top of the stack of originals at the start of feeding, the originals are fed one after another, and the final original is placed on top of the stack of originals. One cycle of the original is detected by the fact that the end falls under its own weight when it passes through the recycle lever 309.

Next, for double-sided originals, pass the original through passes I and II as described above.
By switching the rotatable switching flapper 310 there, the leading edge of the document is guided to the bus ■, and the transport roller 3
05, it passes through the bus (2) and is stopped on the platen glass 101 by the full-surface belt 306. That is, the configuration is such that the large transport roller 307 reverses the document along the routes of buses m to (2) to H. Also, the document bundle 302 is transferred to the bus I one by one.
It is also possible to count the number of originals by conveying them through ~■~■~■~■ until one cycle is detected by the recycle lever 309.

D Sorter (device for sorting) (400) The sorter (400) has a tray of 25 bins and performs sorting.

Copied sheets are sequentially ejected from the paper ejection roller 229 of the main body, enter the conveyance roller 401 of the sorter, and are transferred to the bus 403.
The paper is discharged from the discharge roller 405 to each bin 411 via the discharge roller 405 . For example, in a sorting mode, each time sheets are discharged into each bin, a bin shift motor (not shown) moves the bins up and collates the sheets.

FIG. 4 shows an example of the arrangement of the operation panel provided on the main body 100 described above. The operation panel has a key group 600 and a display group 700 as described below.

E. Key group (SOO) In Fig. 4, 601 is the asterisk (*) key, which is used when the operator (user) is in the setting mode, such as setting binding substitution or setting the size of original frame eraser. use

606 is an all reset key, which is pressed to return to the standard mode.

Reference numeral 602 is a preheating key, which is pressed to put the machine of the main body 100 into a preheating state and to cancel the preheating state. Also,
This key 602 is also pressed when returning from the auto-shutoff state to the standard mode.

605 is a copy start key (copy start key);
Press to start copying.

A clear/stop key 604 functions as a clear key during standby and as a stop key during copy recording. This clear key is pressed to cancel the set number of copies. In addition, * (asterisk). Also, press the stop key to interrupt continuous copying. After the copying at the time when this key is pressed is completed, the copying operation will stop.

Numeric keys 603 are pressed to set the number of copies. It is also used to set the * (asterisk) mode. Reference numeral 619 is a memory key in which the user can register frequently used motes.

Copy density keys 611 and 612 are pressed when manually adjusting the copy density. 613 is the AE key,
Press this button to automatically adjust the copy density according to the density of the original, or to cancel AE (automatic density adjustment) and switch the density adjustment to manual. A cassette selection key 607 is pressed to select the upper cassette 151, the middle cassette 153, and the lower cassette 201. Reference numeral 627 is an automatic paper cassette selection key, which automatically selects a cassette corresponding to the document and the designated magnification ratio.

Reference numeral 610 is a same size key, which is pressed to make a same size (original size) copy. Reference numeral 616 is an auto-magnification key, which is pressed to automatically reduce or enlarge the original image according to the specified transfer paper size. 617 and 618 are zoom keys, which are pressed to specify any magnification between 50% and 200%.

608 and 609 are fixed size scaling keys, which are pressed when specifying reduction or enlargement of the fixed size.

A double-sided key 626 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. 625 is a binding margin key, which can create a binding margin of a specified length on the left side of the transfer paper. 62
4 is the photo key, which is pressed when copying a photo Jy or manuscript. Reference numeral 623 is a multiple key, which is pressed when creating (combining) an image from two originals on the same side of transfer paper.

Reference numeral 620 denotes a document erase key, which the user presses when erasing the border of a standard size document.The size of the document at that time is set using the asterisk key 601. Reference numeral 621 is a sheet frame erase key, which is pressed to erase the frame of the document according to the cassette size.

622 is a page continuous copying key, which allows you to copy the left and right pages of a manuscript.
Press to make copies on separate sheets.

614 is the paper discharge method (stable, sort, group)
This is a selection key, and if a stapler that can staple paper after printing is connected, it can select or cancel stable mode and sort mode, and if a tray (sorter) is connected, it can be used for sorting. , sort mode, and group mode can be selected or canceled.

Reference numeral 615 is a paper folding selection key that allows selection and cancellation of Z-folding, which folds recorded paper of A3 or B4 size into a Z-shaped cross section, or half-fold, which folds recorded paper of A3 or B4 size in half.

630 is a developer selection key, and each time the key is pressed, a black developer and a color developer are alternately selected.

F. Display group (700) In Fig. 4, 701 is an LCD (liquid crystal) type message display, for example, 5x7 dots form one character, a 40-character message and a fixed size variable key 6.
08,609, same size key 610, zoom key 617,6
The copy magnification set in step 18 can be displayed. This display 701 is a transflective liquid crystal display with two colors of backlight, and the green backlight is normally lit.
The orange backlight lights up when an error occurs or when copying is not possible.

Reference numeral 706 denotes an equal magnification display, which lights up when equal magnification is selected. Reference numeral 730 is a developer display device that displays the selected developer. A copy number display 702 displays the number of copies or a self-diagnosis code. Reference numeral 705 is a used cassette display, which displays which of the upper cassette 151, the middle cassette 153, and the lower deck 201 is selected.

704 is an AE display, and the AE key 613
(Automatic density adjustment) Lights up when ° is selected. 709
is a preheating indicator, which lights up when in preheating state. When in the auto-shutoff state, this indicator 709 blinks. Reference numeral 707 denotes a ready/wait indicator, which is a two-color LED of green and orange, which lights green when ready (copy possible) and lights orange when wait (copy not possible).

A double-sided copy indicator 708 lights up when either double-sided copying from a double-sided original or double-sided copying from a single-sided original is selected.

When using the RD F 300 in standard mode, the settings are 1 copy, automatic paper selection, same size, and 1-sided copying from a 1-sided original. In standard mode when R, DF300 is not in use, the number of copies is 1, density manual mode,
The settings are for single-sided copying from a single-sided original at the same size. R.D.
The difference between when the F300 is in use and when it is not is determined by whether or not a document is set on the RD F300.

A power lamp 710 lights up when a power switch 712 is turned on.

G. Control Device (800) FIG. 1 shows a block diagram of the control device 800 of this embodiment. In the figure, 801 and 814 are a master CPU and a slave CPU. 803 is a read-only memory (ROM) in which a control procedure (control program) as shown in FIG. 2 according to the present invention is stored in advance, and the CPU 801 is connected via a bus according to the control procedure stored in this ROM. Control each component device. Reference numeral 805 denotes a random access memory (RAM) which is a main storage device used for storing human data and as a working storage area.

807 is an interface (Ilo) that outputs a CPU 801 control signal to a load such as the main motor 133;
inputs the input signal from the image tip sensor 121, etc., and sends it to the CPU 8.
An interface 811 is an interface for controlling input/output between the key group 600 and the display 700. These interfaces 807, 809゜8
11 is an example of NEC's input/output circuit board μPD8255
use.

The display group 700 is each display shown in FIG. 4, and uses LEDs and LCDs. Further, the key group 600 is each key shown in FIG. 4, and the CPU 801 can know which key has been pressed using a known key matrix.

813 is a dual port RAM that can read and write data from CPU 801 and CPU 814 to each other.
It is used for data communication between U801 and CPU814.

The CPU 814 controls the blank exposure unit 170 according to the blank data calculated by the CPU 801. Then, a potential sensor 171, a size detection 176.
The output signals of 177 and 178 are A/D converted and the data is transferred to the CPU 801 via the dual port RAM 813.

Reference numeral 812 denotes a watchdog circuit (control unit monitoring means) for monitoring an abnormality in the CPU 801, and generates a reset signal for the CPU 801 and CPU 814 when an abnormality is detected.

815 is a power supply to be supplied to this embodiment, and 816 is a 24V (ON), 10V (OFF
) is a circuit that converts C to 5V10V.
PU801 detects the opening of the power switch, generates a pseudo abnormal signal by the program, transmits this to the watchdog, resets it, and turns off all load drives.
do.

FIG. 2 is a flowchart of monitoring the power switch 712. At 2000, the CPU is powered on and starts after completing the well-known reset. After turning off all the output ports in 2001 and initializing the RAM in 2002, turn the power switch 712 ON10F in 2004.
Check F, during OFF (open) 2003, c
Watchdog 81 is activated by a signal from puso t.
2, a watchdog pulse is oscillated to indicate normal operation. After detecting ON (closed),
By the time OFF is detected in 2007, the copying apparatus is controlled in 2006 and a watchdog pulse indicating normal operation is oscillated in 2005.

When the OFF (open) state of the power switch 712 is detected in 2007, the control unit is put into a pseudo abnormal state, this is detected by the watchdog circuit 812, and the oscillation of the watchdog pulse is stopped in 2008, and the A reset signal is generated to the watchdog 812 and the CPU 81
4, 801 is initialized in the same way as when the control unit is powered on, and the process ends in step 2009.

In this way, the watchdog circuit 812 detects the opening of the power switch 712 and supplies a reset signal to the CPU 801.814.

The above method can also be applied to situations other than opening the power switch.
The stiffness will be explained as a second embodiment of the present invention. That is, the first
In the "copying machine" having the configuration shown in FIGS. 3 and 4, a program monitoring means is provided which detects an abnormality in the apparatus on the program and puts the control section into a pseudo abnormal state. As a result, when an abnormality in the device is detected in the program, a reset signal is supplied from the watchdog circuit 812 to the CPUs 801 and 814, and the device can be started from the reset state in the same way as when the control unit is powered on. .

〔Effect of the invention〕

As explained above, since the present invention uses the control unit monitoring means, programming errors are likely to occur due to the increase in program memory for processing the opening of the power switch and the detection of abnormalities in the device on the program. The problem will be solved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the first embodiment of the present invention, Fig. 2 is a flow chart of power switch monitoring of the same embodiment, Fig. 3 is a mechanism diagram of the same embodiment, and Fig. 4 is the operation panel of the same embodiment. 712 --- Power switch 800 --- Control device 812 --- Watchdog

Claims (2)

[Claims] (1) A power switch that opens and closes the power supply for load units other than the control unit, a control unit monitoring means that detects abnormalities in the control unit and supplies a reset signal to required locations, and a control unit monitoring unit that detects when the power switch is opened. An image forming apparatus comprising: power switch monitoring means for detecting and putting a control unit into a pseudo abnormal state. (2) A control unit monitoring means that detects an abnormality in the control unit and supplies a reset signal to a required location, and a program monitoring unit that detects an abnormality in the device according to the program and puts the control unit in a pseudo abnormal state. An image forming apparatus characterized by: