JPS6361661B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a safety device for dealing with troubles in an image forming apparatus such as a copying machine. [Prior Art] Conventionally, when a jam in a sheet is detected, the operation of the apparatus is stopped and the operation of the apparatus is prohibited from restarting until the jam removal is completed. [Problems to be Solved by the Invention] However, in the conventional device, when a jam is detected, the device is mechanically locked so that it does not operate until the jam removal is completed, so it is difficult for the operator to release the lock. This is troublesome, and the configuration thereof is also complicated and expensive. The present invention aims to solve the above-mentioned problems. [Means for Solving the Problems] The present invention provides an image forming means and a switch that controls power supply to the image forming means in conjunction with opening and closing of a member 101 that opens and closes a housing of an image forming apparatus. 10
4, means CPU for detecting a trouble in the image forming means and outputting a trouble signal; means 107 for storing the trouble state based on the trouble signal output from the detecting means; and a means 107 for accumulating electric charge according to the closed state of the switch. and means 108R for canceling the memory of the trouble state using the charge accumulated by the accumulation means when the opening/closing member is opened. [Operation] According to the present invention, when the opening/closing member is opened, the memory of the trouble state is cleared by the electric charge accumulated up to that point, so that the memory of the trouble state can be easily cleared with a simple configuration. [Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a copying machine according to the present invention. In the figure, 1 is a platen on which a document is placed and moves back and forth, 2 is a rotatable drum having a seamless photoreceptor around its periphery, and 3 is a platen. 1, a lamp for exposing the original image onto the drum 2; 5, a corona charger that charges the surface of the photoreceptor in advance; 6, a corona charger that removes negative charge from the surface of the photoreceptor together with the exposed image; 8, a developer that develops the electrostatic latent image. 9 is a charger for transferring the developed image onto transfer paper 10; 11 is a cassette storing a large number of transfer papers 10, which is removable from the main body; 12 is a stand for manually feeding the transfer paper 10;
13 is a roller that feeds the transfer paper from the cassette;
14 is a roller that feeds the transfer paper from the manual feed table 12, 15 and 16 are micro switches that detect the manual transfer paper, 17 is a registration roller that aligns the front edge of the copy paper with the leading edge of the drum image, and 18 is the transfer paper. 19 is a belt for conveying the transfer paper, 20 is a fixing roller, 21
23 is a blade cleaner that removes residual toner from the drum; 4 is a magnet roller that collects the toner removed by the blade 23; and 7 is a container that stores the toner collected by the roller 4. , 24 is a negative corona charger that removes the residual charge on the drum, 25 is a shutter for directly applying the light from the exposure lamp 3 to the exposure surface of the drum for a certain period of time, and 26 and 28 are the shutters that apply the light from the lamp 3 directly to the drum surface. A mirror 27 attached to the mirror 27 is a short focus lens array for imaging the light reflected from the original by the lamp 3 onto the drum surface. Explain the operation. When the main switch is turned on, the motor that drives the drum 2 is turned on, the lamp 3 is lit, the shutter 25 is opened, and at the same time the corona charger 6 is turned on to rotate the drum 2. Thereby, the drum surface is previously cleaned of residual toner, residual charge, and memory. When the fixing roller 20 reaches a fixable temperature by an internal heater, a copy enable signal is generated. If the copy switch is not turned on, the drum continues to rotate, and the drum stops when a predetermined number of pulses are counted from a rotary encoder provided in the drum drive system that generates n pulses per rotation of the drum. The above rotation of the drum is referred to as a first pre-rotation. When the copy switch is turned on while the drum is rotating or stopped, the shutter 25 is closed and the drum 2 is rotated again. After about one rotation (hereinafter referred to as the second pre-rotation), the platen 1 starts moving forward and the original on the platen 1 is slit exposed. Start. The reflected image of the lamp 3 is slit-exposed onto the drum via a short focus lens array. The photoreceptor of the drum 2 is composed of an insulating layer, a photoconductive layer, and a conductive layer from the surface, and when the surface charged by the charger 5 reaches the exposed surface, the positive charge is removed by the negative charger 6 and the optical image. . A high-contrast electrostatic latent image is formed on the drum surface by the light from the mirror 26 whose surface reaches the uniformly exposed surface. Toner is applied to the latent image in the development area and the latent image is developed. The visible image is transferred to the transfer paper by the positive potential of the transfer charger in the transfer area. One sheet of transfer paper is separated and fed from the cassette 10 by the timing operation of the paper feed roller 13, and is passed through the transfer paper by the registration roller 17 at the same speed as the peripheral speed of the drum. After the transfer, the transfer paper is separated by a roller 18, sent to a fixing roller 20 by a belt 19, where the image is fixed, and then discharged to a tray 22 by a roller 21. After the transfer is completed, the drum surface is then transferred to the blade 2.
3, the charger 24 removes static electricity, and the memory is removed by light from the lamp 3 via the mirror 28. When making continuous copies from the same original, platen 1 is used for the number set using the numeric keypad on the copier control panel.
Repeat the back and forth motion. Figure 2 is a diagram of the platen stand. The platen stand has a magnet 29, and reed switches 30, 31, 32, and 35 are arranged on the platen movement path and are activated by the passage of the magnet. When the magnet turns on 35, The document table is stopped at the initial position at the center of the main body, and when 30 is turned on, the document table is switched to forward movement in the right direction for exposure. 31 is a switch for feeding paper by the paper feed rollers 13 and 14, and 32 is a switch for feeding paper by registration rollers 17. In the case of continuous copying, after the first slit scan is completed, the document table moves backward and the switch 30 is pressed.
When turned on, the document table starts moving forward again and performs the second scan. In this way, the set number of copies will be made. The lamp 3 and the simultaneous charger 6 are turned on and off in synchronization with the rotation of the main motor, that is, the drum, and the primary charger 5 and the front charger 24 are turned on except during the post-rotation cycle. Incidentally, the lamp 3 is controlled to have a strong luminous intensity while the document table is being scanned. In the case of manual copying, when a sheet is inserted from the table 12, the detector 15 detects the sheet. Then, the feeding roller 14 is turned on to take the sheet into the machine. However, the detector 15 detects the sheet for a certain period of time (approximately 2
seconds) does not turn on the roller 14. This prevents oblique insertion, corrects the sheet to be straight, and allows time for sheet replacement.
When that time has elapsed, the roller 14 is turned on and the drum 2 is rotated to start the process sequence similar to the case of turning on the copy switch.
Incidentally, by starting the second pre-rotation of the drum 2 at the same time as the detector 15 detects the sheet, it is possible to bring forward the start of copying. Also, the sheet insertion detector 15
When detected, sheet feeding from the cassette is blocked. By simply inserting the sheet as described above, you can start copying without turning on the copy switch on the operation panel, and the sheet is fed into the machine while maintaining the correct sheet position, and the toner image is transferred to the specified position on the sheet. It is possible to prevent the sheet from jamming. When the switch 16 detects that the rear end of the sheet has finished passing through, the roller 14 is turned off to prepare for the next sheet insertion. Incidentally, a plurality of these detectors 15 can be provided perpendicularly to the sheet feeding direction. This is to detect the skew of the sheet, and the roller 14 is not turned on until both detect the sheet. FIG. 3 is a plan view of the operation section of the copying machine shown in FIG. 1, where 39 is a power (main) switch, 40 is a copy start key switch, 41 is a stop key switch for interrupting continuous copying, and 42 is the number of continuous copies. 43 is a clear key to clear the number in memory, 44 is a copy density set lever, 45 is a 7-segment display for the number of memories, 46 is the temperature at which the fixing roller can fix 47 is a lamp that is used to display the cassette and no sheet in the cassette; 48 is a container 7 for collecting used toner by the cleaner;
This lamp is displayed when the toner inside is full.
49 is displayed when the sheet is jammed. The clear key and numeric keypad do not work when jammed, but the numeric keypad and clear key can be used while waiting. The segment display 45 displays 1, which is suppressed to zero when the power switch 39 is turned on, regardless of whether it is in a wait state, and displays a number subtracted by 1 from the set number each time one copy is completed, and once the set number has been copied, the segment display 45 displays the set number again. Displays the number, then displays 1 again after 30 seconds without starting copying. As a result, copying of one sheet can be started without having to perform several sets using the numeric keypad, and copying can be resumed smoothly. The weight indicator 46 flashes when the power switch 39 is turned on, but if the temperature of the fixing roller has not fallen below the fixing temperature, that is, if the previous operator turned off the power switch 39, It lights up statically, but blinks if the temperature is below the fixing temperature (wait). It also lights up when the fixing roller rises to a fixable temperature and the wait time has elapsed. When the power switch is turned off, both the blinking and the lighting state disappear and the power off state is displayed.Furthermore, when the copy switch is turned on after waiting up, the blinking operation with a longer blinking interval than during the wait is performed until the shift to the post-rotation mode. That is, one wait display can display four states: power-on state, copy-incapable wait state, copy-enabled state, and copy cycle in progress, which saves on display space and contributes to reducing device costs. It is something. The overflow indicator 48 detects and displays an overflow state of the container 7, and also detects a shortage of toner in the developer container 33 and statically lights up the display. In the former case, the lamp can be blinked, and in the latter case, it can be turned on statically.
Further, the paper out indicator 47 blinks when there is no paper, and can be turned on statically when there is no cassette. Also, when a shortage of toner in the hopper 33 or an overflow in the collection container 7 is detected, if the number of consecutive copies set using the numeric keypad is being executed, copying will continue until the set number of copies are completed, and then copying will be restarted. It is something to prevent. This prevents a display warning from being immediately interrupted, delaying a series of copying operations, and reducing the actual copying speed. This is because even if there is a shortage of toner or an overflow occurs, the image will not suddenly deteriorate and the device will not be contaminated. If the transfer paper jams, immediately stop the movement of the device to ensure safety. Also, the stop key, no paper, and no cut signals do not immediately interrupt the process, but instead complete the current process cycle and prevent the next cycle from starting. FIG. 4 is an operation time chart of the copying machine shown in FIG. 1, and with reference to this chart, the scanning operation sequence and operation timing will be explained in detail. Before the copy switch 40 is turned on, the platen 1 is located at the center of the main body as shown in FIG. When the copy switch 40 is turned on, the pre-static charger 2
4. Turn on the lamp 3, primary charger 5, secondary charger 6, transfer charger 9, and shutter 25, and expose the photoreceptor to a pre-corona, a primary corona, a secondary corona, a transfer corona, a pre-static discharge exposure, a Planck exposure,
Apply uniform exposure and prepare to start copying. Lamp 3 is lit at low light. When the pulses are counted a predetermined number of times, that is, the drum is rotated a predetermined number of times, the platen 1 starts moving to the left from the state shown in FIG. Start moving to . Then, the lamp 3 is turned on strongly, the shutter is turned off, the blank exposure is stopped, and the exposure is started. Here, blank exposure is to irradiate the image exposure surface with light when image exposure is not being performed so as to prevent potential unevenness from occurring on the photoreceptor. After the image is exposed for approximately one and a half rotations, the movement of the platen 1 is stopped and moved to the left. This movement is started by counting the previous pulses by a predetermined number, and the number set in the memory is set in the copy counter register and subtracted by 1 from that number. As a result, in the case of copying one sheet, the register becomes 0, thereby preventing the subsequent restart of copying. While moving forward to the right, turn on the reed switch 31 shown in FIG.
3 and 14, turn on the reed switch 32, and turn on the registration rollers 17 to feed the sheet. Even if the reed switches 31 and 32 are turned on while the platen is moving for purposes other than exposure, the rollers 13 and 1
4, 17 are not turned on. When the switch 35 at the initial position is turned on, the platen 1 stops moving. Then, the lamp 3 is controlled to be lit weakly, the shutter is turned on, and blank exposure is started by lighting the lamp 3 weakly. Thereafter, the drum continues to rotate, during which the photoreceptor is electrically and mechanically cleaned, and after approximately one rotation, the process load is turned off as shown in FIG. 4, and the drum rotation is stopped. After this stop, the power-on state continues. In the case of continuous copying, even if the switch 35 is turned on, the platen 1 does not stop and continues to move to the left. When the switch 30 is turned on, the platen 1 starts moving to the right again, turns on the lamp 3, and turns off the shutter. and restart image exposure. When the thermistor 204 is disconnected and overflow, no toner, or no cassette/paper is detected when the first sheet is detected, the line is shown as a solid line, and when it is normal, the line is shown as a dotted line. The timing when the rightward movement for exposure is stopped and the movement is changed is determined depending on the sheet size of the cassette 10 and the sheet size from the manual feed table 12. Additionally, if thermistor disconnection is detected, WAIT is output. FIG. 5 is a longitudinal cross-sectional view of the cassette section and manual feed section. FIG. 6 is a horizontal plan view thereof. 15-1 is a photo interrupter that constitutes the manual sheet detector 15, 15-2 is an operating piece that swings when a sheet is inserted, and 50 and 51 are micros that are activated by a cam provided on the cassette when the cassette is inserted into the main body. With the switch, when both 50 and 51 are off, there is no cassette, and when each is on and off, it is half size.
In the case of a cassette with A4 and B5 size sheets, when each is off and on, it means a set with B4 size sheets, and when both are on, it means a cassette with full size, that is, A3 and B4 size sheets. Generate a signal. Three types of signals for these sizes are used to determine the exposure stroke of the platen 1. As for manual feed sheets, since B4 size is included in the full size, the sheet detector 15 detects two types, half size and full size. Therefore, when a large number of copies are made by continuously feeding paper from a cassette, the copying cycle is repeated in strokes corresponding to each size, that is, in the minimum amount of time, so that the time required for copying can be reduced. However, in the case of manual feed, since continuous feeding is rare, two series of stroke control is sufficient, the control circuit can be simplified, and malfunctions related to size detection can be reduced. The actuating piece of the sheet biopsy device 15 is provided at the left end as shown in FIG. This position corresponds to a belt located outside the imaging area of the drum for separating the transfer paper from the drum after transfer. Therefore, it is possible to determine whether or not the manual sheet has been inserted into a predetermined position where it can be separated. Sheet detector 16 is provided at the same left end position as 15 with respect to the photoreceptor. This detector 16 has the following three functions. First, the size of the manually fed sheet is detected, so that when the detector 16 does not detect a sheet at a predetermined time, it is determined to be half size, and when it does, it is determined to be full size. The second method is to make the length of the path from the tip of the manual feed sheet to the registration roller the same as that from the cassette sheet. That is, the sheet fed by the manual feed roller 14 is detected by the detector 16.
When the roller 14 is detected, the roller 14 is turned off after a certain period of time, and preparations are made to send the sheet to the registration rollers. Then, the roller 14 is turned on again in response to a signal from the read switch 31 to start feeding the paper toward the registration roller. Thirdly, when the trailing edge of the sheet is detected, the roller 14 is stopped to prepare for the next sheet. The sheet detector 15 detects the sheet and the roller 14
is turned on, and the detector 16 detects the sheet and turns off the roller 14. In other words, the preliminary feeding is to prevent the function of the registration rollers from being impaired. This is to keep the number of loops within an appropriate range. Therefore, there is no need to fold or jam the sheet. This also applies when feeding paper from a cassette.
When the copy switch is turned on, the paper feed roller 13 is turned on for a short time to pull out the sheet from the cassette. The reed switch 31 starts feeding the stretched sheet until it reaches the registration rollers. The cassette roller 13 has a half-moon shape in cross section, and makes a half turn from the state shown in the figure for preliminary feeding, and then makes a further half turn for main feeding. FIG. 7 is an operation control circuit diagram of the copying machine shown in FIG. 1. In the figure, Q ₁ to _{Q 6} are each main motor (drum 2,
various rollers, a clutch that operates the belt 19), a clutch that operates the manual feed roller 14, and a registration roller 17
a clutch that operates the cassette roller 13, a clutch that moves the document table 1 backward,
This is a flip-flop for controlling the operation of the clutch that moves the document table 1 forward, and is turned on by a pulse rising signal to port S and turned off by a pulse rising signal to port R. _Q7 is a one-shot for controlling the weight of the main motor, and after the main switch is turned on, it produces an output for a time period _T3 as shown in FIG. _Q8 is a flip-flop for determining the manual feed mode.S,
The function of R is the same as _Q1 except that it is not an edge trigger. _Q9 is a timer for operating the manual feed roller 14 to produce an output after time _T1 as shown in FIG. 9, and is conditioned on the input signal being turned on for _T1 time. _Q10〜
Q13 is a counter that counts clock pulses generated by drum rotation from the time of input signal input and outputs a pulse when a predetermined count is reached.
Q ₁₀ and Q ₁₁ are used to determine whether each manual feed roller is turned off and the cassette roller is turned off, and Q ₁₂ and Q ₁₃ are used to determine the front rotation speed and rear rotation speed. This clock pulse DCK is generated by the aforementioned rotary encoder at constant N pulses at equal intervals per rotation of the drum.
ke occurs. Q ₁₄ is a counter similar to Q ₁₀ to _{Q 13} above, but in cassette mode, the number of presets is selected according to the cassette size, and in manual mode, the number of presets is selected manually in a mode different from cassette mode. Select according to the difference sheet size. _G1 to _G10 are AND gates, _G15 to _Q25 are OR gates, and _INV1 to _INV6 are inverters. Signal M ₁ , MRCl, RGCl, CRCl, FWCl,
BWCl is a signal that turns on the main motor, manual feed roller, registration roller, cassette roller, document making forward and reverse when it is 1, and turns it off when it is 0, CLK is a clock pulse, BP is a signal for reversing the document platen,
END is the copy cycle stop signal and the stop key is
STB without count-up, paper/cassette,
Based on CTU, PEP, and CEP signals. Manual error is a signal indicating the manual mode, JAM is a signal indicating a sheet jam and is generated by jam detection, CTU is a copy counter count-up signal indicating that the preset number of copies has been completed, and SW is a main switch on signal that indicates the SW state. Detect and output. PS ₁ ,
PS ₂ is a signal output when the manual feed sheet is detected by the detectors 15 and 16, PF and RG are the paper feed signal, registration signal, CPB, and STB that are generated when the document table turns on the reed switches 31 and 32 as described above.
When the copy button or stop key on the operation panel is turned on, the document platen for SP and HP is turned on by the read switch 3.
When 0 and 35 are turned on, the signals generated indicate the start position and stop position of the document table advance. PEP is cut 1
The sheet in 0 is the sky, the lamp 60-1 and the photoreceptor 60
A signal that is optically detected and output by -2.
CEP is a signal indicating that the cassette 10 is disconnected, and is outputted by microswitches 50 and 51 whose operation is controlled when the cassette is turned on.
TEP is a toner out signal in the developer 34, which is output when the toner level detector 61 in the developer container detects that the level has fallen below a certain level.
OVF is a signal indicating the overflow state of the collected toner in the collection container 7, and is detected by the level detector 62 and output. WAIT is a thermistor that detects the temperature of the fixing roller with a signal indicating the wait state.
Output by Th. Explain the operation. During the wait signal WAIT generated by turning on _the power supply 39, the _one shot _Q7 shown in _FIG . let After that, when the wait is up (WAIT is 0) and the copy button is turned on in standby, flip-flop _Q1 is set and the main motor is turned on in the same way to start the process. Since the sheet is not inserted from the manual feed tray 12, the detection 15 is off, so the flip-flop Q ₈
is off, so no manual signal is output, gate _G1 is turned off, flip-flop _Q2 is not set, and manual roller 14 is not turned on. If there is no paper, no toner, no overflow, etc., gate G ₃ is activated by turning on the copy key.
A start signal is input to gate _G2 via _G25 and _G16 . Since the weight and manual inversion signals (all 1) are input to the other input port of the gate _G2 , the flip-flop _Q4 is set on and the clutch of the cassette roller 13 is turned on. While the counter _Q11 counts a predetermined number of pulses via the gate 17, the roller 13 rotates half a turn and stops, and approximately half of the sheet is pulled out of the cassette and then stopped. Counter through gate G ₂₂ at the output of this Q _4
Q12 starts the clock pulse count CLK. A predetermined number of pulses sets flip-flop _Q5 through OR gate _G24 to turn on FWCl and move the document table to the left. When the reed switch 30 is turned on by the document table, Q ₅ passes through gate G ₁₉ .
to turn off the clutch FWCl, while setting flip-flop _Q6 to turn off the clutch signal BWCl.
Turn on and move the document glass to the right. Image exposure lamp 3
The lighting is controlled in synchronization with the main motor _M1 , but
The intensity of light is controlled in synchronization with this BWCl control, and becomes strong when BWCl is on. The reset timing of _Q6 at which the first slit exposure ends is determined by the cassette switches 50 and 51. In other words, when the switches 50 and 51 are 1 and 0, the size
Since the A4 sheet is in the cutter, the exposure stroke can be completed within that width. In other words, counter _Q14 determines the reversal position by counting clock pulses.
Set the preset number to n1, which is suitable for A4. When the size is B4, the switches 50 and 51 are 0 and 1, so n2, which is larger than n1, is preset. For A3, 50 and 51 are 1 and 1, so set even more n3. Furthermore, when 50 and 51 are 0 and 0, gate Q ₅
Outputs the no-set signal CEP via The counter _Q14 counts pulses after the registration switch 32 is turned on, and when it reaches the number n1 to n3, it outputs BP, resets the counter _Q6 , and completes the advance. Meanwhile via gate G ₂₄ by BP
_Q5 is set and the document table is moved to the left. When the document table turns on the reed switch 35, _Q5 is reset and backward movement is stopped. By the way, when the switch 31 is turned on while the document table is moving forward, the signal PF is inputted to the gates G ₁ , G ₂ and the counter Q ₁₁ via the gates G ₁₅ , G ₁₆ , and G ₁₇ . As mentioned above, gate _G1 is off, so _Q2 is not set, but
When the gate _G2 is turned on, the sheet feeding flip-flop _Q4 is again rotated and the set roller 13 is further rotated to pull out the sheet that has been set in advance. Then, the leading edge of the sheet is brought into contact with the registration roller 17 to form a loop 4 (sag) in the sheet. Therefore, the sheet can be held by the registration rollers with an appropriate loop amount, and there is no need to consider the distance between the paper feed roller and the registration rollers in a complicated manner. Since the loop can be kept appropriately constant, sheet jams can be reduced.
This technique is also used in the case of manual transmission (described later). Thereafter, by turning on the registration switch 32, the flip-flop _Q3 is turned on and the roller 17 is operated. This continues to rotate until the start switch 30 is turned on next time. Gate G ₁₀ for multiple copies of preset numbers
Q5 will not be turned on even after the process is completed once, so even if the stop switch 35 is turned on, _Q5 will not be reset.
Therefore, the vehicle continues to move backward, and by turning on the start switch 30, _Q5 is reset and the backward movement is stopped. At the same time, Q is set again and the second forward exposure is started. This gate _G10 receives the signal STB from the stop key 41, and the signal from no paper and no cassette.
PEP, CEP, or preset number copy completion signal
It is turned on by the END signal from each CTU. Therefore, until the copy cycle of the preset number is completed,
Furthermore, gate _G10 controls the output of the signal HP so that the scan is repeated until an interrupt command is issued due to the stop key, no paper, etc. In addition, in order to feed the second and subsequent sheets by the signal HP, Q ₄ is sent via G ₄ , G ₂₅ , G ₁₆ , and G _2.
to tut. Next, the manual feed mode will be explained in detail. The operator places one sheet on the stand 12 and presses it against the roller 14 side. First, the detector 15 determines whether the sheet has been properly inserted. When signal PS ₁ occurs, timer Q ₉ turns on and starts the timed operation of T ₁ . Before this T ₁ , the sheet is corrected in direction so that it hits the stopped roller 14 and is approximately perpendicular to the roller 14. In other words, the posture of the sheet can be maintained correctly for a while after it is inserted, and jams due to skewed feeding after feeding can be prevented. When _T1 has elapsed, flip-flop _Q2 is set via gates _G15 and _G1 . Also flip flop
Set Q ₁ through gate G ₂₇ . For _G1 , the flip-flop _Q8 is set by the switch 15, so the manual input is 1. Furthermore, since the gate _G2 is inhibited via the inverter, driving of the cassette roller 13 is blocked even if the signal PF is generated. The drum is rotated by _Q1 , and the manual feed roller 14 is rotated by _Q2 , and the sheet is taken into the machine. And a detector 1 installed behind the roller 14
The sheets arrive at 6. When this point is reached, the detector generates a signal PS ₂ and starts counting the counter Q ₁₀ . When the timer _T2 has elapsed and counted up, _Q2 is reset via gate _G23 , the roller 14 is stopped, and the next paper feeding step is awaited. This corresponds to preliminary paper feeding from the cassette in cassette mode. If the detector 15 detects a hand-wound sheet regardless of whether the platen 1 is moving forward or backward, the sheet is preliminary fed as described above. Further, by turning on the roller 14, the pre-rotation counter _Q12 is started via the gate _G22 , and after a predetermined rotation, the flip-flop _Q5 is set, the document table is moved to the left as in the case of the cassette mode, and the start switch 30 is turned on. When it hits, the exposure starts moving forward. In this way, in the manual mode, it is possible to enter the copy cycle without turning on the copy switch 40, making the operation easier. When the switch 31 is turned on while the exposure is progressing, the gate is turned on.
_Q2 is set again via _G15 and _G1 , and the roller 14 is driven to feed the sheet so as to hit it against the registration roller. When the next switch 32 is turned on, _Q3 is set as in the case of the cassette mode, the registration roll 13 is rotated, and the sheet is sent to the transfer section. When the sheet leaves the detector 16, _Q2 is reset via the inverter and gate _G23 , and the manual feed roller 1 is activated.
Stop the rotation of step 4. This is to prepare for the next sheet feeding. In the manual feed mode, copying can be started and resumed even if a cassette out, paper out in cassette, out of toner, or overflow signal is generated. With manual feeding, at most several copies are made in succession, so even if TEP or OVF 1 occurs, it will not have any particular adverse effect on the image or the device.Therefore, this technology respects the simplicity of operation. It is. However, when TEP and OVF are 1, it is possible to allow the start of copying (the first copy) but prevent subsequent restarts, or to disable copying from the beginning. It is also possible to continue the timer operation even if the sheet momentarily leaves the detector 15 during _T1 by the timer _Q9 , thereby preventing skew feeding as much as possible. Since the detectors 15 and 16 are arranged to separate the sheets, they can also be used to position the sheets, and even small sheets such as postcards can be copied at appropriate positions. Next, document table reversal control in the case of manual feeding will be described in detail. In FIG. 7, the signal _PS2 from the sheet detector 16 and the predetermined count signal x from the counter _Q14 are input to the input of _G6 . This is for selecting one of the preset numbers n1 and n3 of the counter _Q14 . In other words, _Q14 starts counting from the registration signal RG, and at the predetermined pulse, the backward detector 1
If there is a sheet in 6, it is determined to be a large size (full) such as A ₃ or B ₄ , and if there is no sheet, it is determined to be a small size (half) such as A4, and the scan stroke is divided into two. That is, when x is 1, when PS ₂ is 0, that is, 1 is input to gate G ₆ via the inverter, n1 is preset to Q ₁₄ . When x is 1,
If the detector 16 is still in the state of sheet detection, 0 is G ₆
is input to the inverter and presets n3 via the inverter and gate. Therefore, when the counter is manual, x
Thereafter, counting continues until n ₃ and n ₁ depending on whether it is full or half, and an inverted signal BP is output. Also, if you insert it manually while going backwards, the output of INV ₂ becomes 0, so the output of G ₁₀ is turned off, so the switch 35 does not stop the platen.
Continue cycle. The important point here is that the sheet has already been fed to the registration roller 17, so the timing signal x that senses the sheet detector 16 has fewer pulses than _n1 for A4 size, and before the stroke for A4 size is completed. This is the timing of occurrence. In this way, the size data of the manually fed sheet can be determined sequentially between process sequence controls without inputting it in advance by some method and can contribute to the sequence control, and the circuit configuration etc. can be simplified. In addition, in case of cassette mode, we want to increase the speed as much as possible for continuous multi-copying, and we want to set strokes according to various copy sizes, so we set 3 as shown in the figure.
However, in the case of manual mode, two stroke modes are sufficient since you will be copying at most a few sheets. In this way, the control mode in the case of manual control is simplified as much as possible to reduce troubles as much as possible. Next, the copy stop command in the cassette mode will be explained. PEP, TEP, CEP, and OVF prevent restart by copy key. Before the multi-copy is completed, gate G ₁ outputs the signal END by the stop key STB signal, PEP, and CEP signals, and gate G ₄
This prevents the subsequent preliminary operation of the paper feed roller 13. Multi-copy is therefore interrupted. If the stop key is pressed, copying will resume when the copy key is turned on.
For TEP and OVF, multi-copying is completed without interruption. It is also possible to control the various strokes by sensing the sense timing of the detector 16 in the manual feed mode by dividing it into x...xn, and it is also possible to set the preset number _Q14 to be different from that in the cassette mode. If a sheet from the cassette or manually fed is jammed, a jam signal is sent to the R boats of Q ₁ to Q ₆ and Q _8.
Enter JAM and turn off all clutches and main motors without waiting for the process to complete. Flip-flop Q for manual mode setting
is reset by the inverted signal BP or jam signal JAM. Also, manual errors occur when the original platen moves backward after exposure, making it possible to resume copying quickly. Furthermore, manual copying can be prevented when OVF and TEP are 1 by starting the timer Q ₉ by ANDing the inverted toner out signal from G ₂₁ and the detection signal PS ₁ . FIG. 10 is an example of a circuit for indicating no toner and overflow. Q ₅₀ ~ Q ₅₂ without each toner,
An operational amplifier is used to detect overflow and paper out, and the output is compared with the reference voltage Vs. Reference numeral 61 determines the toner level in the developer container based on the presence or absence of toner between the lamp and the photoreceptor (CdS), and outputs TEP when the amount of received light is greater than a predetermined value. 62 uses a lamp and a photoreceptor to detect toner in the same way as 61, and when the amount of light received is less than a predetermined amount, the OVF
Output. Similar to 61, 60 outputs PEP when the amount of received light is greater than a predetermined amount. _G60 - _G62 are OR gates, _G65 is AND gates, and INV20-21 are inverters. CPU ₁ inputs the numeric keypad, stop key, copy key, and clear key on the operation unit, displays the display on the display 45, stores the number of copy presets made by the numeric keypad in register RST (memory), and controls the process sequence. control part
Controls start, stop and movement of CPU ₂ . Explain the operation. During copying, when the developer runs out of toner, the operational amplifier _Q50 outputs a signal TEP. The signal passes through gate _G61 and lights up the toner empty indicator 48 to issue a warning. At the same time, control gate _G5 off via the inverter. Therefore, even if you try to restart copying by turning on the copy key after copying is completed, it will not be possible because the STAT signal will be turned off. However, even if the lamp 48 lights up in the middle of copying the preset number using the numeric keypad, the stop signal STB is activated by TEP.
is not controlled. When the toner in the toner collection container 7 increases and approaches an overflow state, a signal OVF is output, and the start gate G ₆₅ is sent via the gate G ₆₁ similarly to TEP.
control. At the same time, the display device that originally displays the absence of toner is shared to display this. In this case, the display may be different from the TEP that blinks and lights up. In the case of OVF, the STB is not controlled and the copying of the preset number is completed. The completion of copying the preset number is performed by counting the signal BP (inverted position of the platen) for each copy cycle by the number of presets in the register RST and outputting the signal END. To interrupt copying, press the stop key.
The jam outputs the signal STB to prevent the continuation of the next cycle after completing one process cycle when the stop key is on, and does not execute all preset cycles. This prevention is performed when there is no cassette or paper.
That is, STB is output to the CPU ₂ via gates G ₆₂ and G ₆₀ in response to the paper out signal PEP and the cassette out signal OEP. Accordingly, the same processing as in the case of stop key-on is performed. Also, PEP and CEP are the same display 4
7 to display that fact. The display contents can also be distinguished by blinking one at a constant cycle and lighting the other statically. If a sheet jam is detected, a signal JAM is output and the display 49 is turned on or blinks. At the same time, turn off the power to dangerous loads (high voltage, heaters, etc.). In other words, the process cycle is interrupted in the middle of the cycle, and not only the preset cycle but also one cycle is not copied. However, the preset number can be maintained so that the power to the CPU and RST is not canceled even when the power switch 39 is turned off. In the case of this jam, the next process can be restarted by manually turning on the switch to release the jam, and cannot be restarted simply by turning on the copy key. FIG. 11 shows an example of a circuit that outputs the wait signal WAIT. In the figure, r ₁ to _{r 3} are the resistances that constitute the temperature detection bridge together with thermistor Th, and Q ₃₀ is Th
Q31 is an operational amplifier that outputs 0 when the temperature is below a predetermined temperature and 1 when it is above a predetermined temperature, that is, the fixing _{temperature.Q31} is a thyristor that is energized by the output 1 of the operational amplifier.
Q ₃₂ is turned on by the output 1 of the operational amplifier, heater H, a transistor for driving relay K1 that generates electricity, AC is a replacement power supply, Q ₃₅ and Q ₃₆ are NAND gates, and Q ₃₈ operates a wait display lamp 46. An AND gate for control, _Q39 is an AND gate that outputs a signal STAT to start the copy process, INV10 and 11 are inverters,
Q ₄₀ is a transistor that turns on the wait lamp 46, CPU is a copy sequence controller,
COPY is a signal indicating that a copy cycle is being executed, and its time chart is clearly shown in FIG.
OSC1 and OSC2 are oscillators with different oscillation frequencies, and are activated when the power is turned on. Figure 12 is an example of a power supply circuit, in which FS is a fuse, LVT is a low voltage transformer for obtaining control power supply voltages Vc and Vc.c., HVT is a high voltage transformer for corona charger operation, MVT is a halogen lamp, etc. Transformer for operating medium loads, CV is the output
The circuit that lowers Vc and Vc.c., REC, is a rectifier. Explain the operation. When the power switch 39 is turned on, DC voltages Vc and Vcc are output, putting the other circuits in FIGS. 7 and 11 into operation. When the temperature of the fixing roller is low and copying is not possible, the operational amplifier outputs 0 due to the high resistance of the thermistor Th, and the thyristor _Q31 maintains the off state, and therefore outputs the wait signal WAIT by the voltage Vc. On the other hand transistor
_Q32 turns on relay K1 to heat heater H1. Then turn on copy key 40 and gate Q ₃₉
is blocked from starting the sheet feed scan. But gate _Q35 inputs oscillator OSC1,
Moreover, since the copying signal COPY is input with a signal of 0, a signal synchronized with OSC1 is output to gate _Q38 . Since the other input of ^the gate _Q38 receives the signal 1 based on the signal of COPY 0, the transistor _Q40 turns on and off in synchronization with OSC1, and therefore the wait display lamp 46 blinks in synchronization with the cycle of OSC1. do. This alerts the operator to the inability to copy. When Th reaches the fixing temperature, the thyristor _Q31 is turned on by the output of the operational amplifier _Q30 , so the signal WAIT becomes 0. On the other hand, relay K1 is turned off to stop power supply to heater H.
The output of gate Q ₃₅ is set to 1, and therefore the output of gate Q ₃₈ is set to 1.
The transistor Q ₄₀ is turned on statically to turn on the lamp 46. Since the gate _Q37 sets one input to 1, it can accept a copy key and waits in a so-called standby state. In this case, in order to maintain the fixing atmosphere at a temperature that allows fixing,
Even if the heater H is turned on and off, WAIT remains at 0 due to the thyristor's energization holding action, so there is no display error. When the power switch 39 is turned off during this standby mode, Vc and Vcc are turned off, so that the weight indicator lamp 46 is turned off and turned off regardless of the above-mentioned holding action of the thyristor. Therefore this lamp 4
6, it is also possible to determine the power supply state to the device. Then, when the power switch 39 is turned on again, the fixing roller, that is, Th, has not cooled down, so the thyristor is immediately turned on via the operational amplifier, and the lamp 46 starts to be lit statically as described above, putting the machine in a standby state. When the copy key 40 is turned on during standby, a start signal is output to the CPU and the main motor is
Starts paper feeding and scanning operations. and
Since the CPU outputs the copy signal COPY, the output of the gate _Q35 is completely set to 1, and a series of pulses of the oscillator OSC2 is output from the gate _Q36 . Therefore, gate Q ₃₈ turns transistor Q ₄₀ on and off in synchronization with OSC2, and thus transistor turns on and off lamp 4.
6 can be flashed repeatedly at a longer cycle than OSC1. When the scanning of the preset number of copies is completed and the document platen inversion position is reached, the signal COPY is set to 0, so that the apparatus becomes standby again, lights up the lamp 46 statically, and accepts a copy restart command. If the copy key is turned on at this time, copying of the previous preset number is resumed without resetting the copy number. This restart is performed in a manner similar to continuous copying in which scanning continues without stopping even when the document table returns to the stop position. If the power switch 39 is turned off without restarting copying, the lamp 46 is turned off, indicating that the voltage to the loads such as the clutch, main motor, corona charger, etc. has been turned off. After turning off the power switch 39, this lamp 4
It is also possible to display the OFF state by weakening the amount of electricity supplied to 6. In this case, even if the central control unit OPU turns off the switch 39, it is effective when it is desired to keep the memory operating state alive. In particular, when processing sheet jams, the power switch 39 is often turned off, and in this case it is not desirable to cancel the number of presets in the memory, so it is extremely convenient to use it as an indication of the memory on state. Note that the fixing device 20 has an upper roller 202 and a lower roller 2.
Furthermore, a halogen heater 203 is inserted into the upper roller as a heat source, and a temperature sensing element 204 is inserted into the upper roller 2 to detect the surface temperature of the upper roller.
The temperature of the fixing device 20 provided in contact with the upper roller 20 is controlled based on the signal from the temperature sensing element 204 to keep the upper roller surface temperature constant by turning on and off the halogen heater 203. Next, the first pre-rotation control will be described in detail. In Fig. 7-2, the input signal S1 is a signal that changes from 0 to 1 state after a time _T1 has elapsed since the power switch 39 is turned on (hereinafter referred to as a power-on signal), and the input signal S2 is a signal that changes when the copy conditions are met. If not, 0 after time T ₂ has passed since the power switch 39 was turned on.
When the copy conditions are satisfied with a signal that changes from 1 to 1 (however, T ₁ <T ₂ ), it returns to 0 (hereinafter referred to as a wait state signal). Q202 is a timer IC, and when power is applied between terminals V+ and V- and a signal falling from 1 to 0 is input as a trigger signal to the trigger input terminal TR, the resistor R201 and capacitor connected to the time constant terminal TC are connected to the time constant terminal TC. 1 is output from the output terminal Q for a time corresponding to the time constant determined by C201. However, at this time, if a 0 signal is input to the reset terminal R, the terminal Q becomes a 0 signal even before time-up. The signal _S3 output from the output terminal Q is input to another circuit (not shown) to execute the first pre-rotation in state 1, and is hereinafter referred to as the first pre-rotation control signal ROT.
It is called 1. Here, the wait signal _S2 remains in one state until the fixing device 20 reaches a predetermined sensitivity based on a signal from the temperature sensing element 204 in the fixing device 20 shown in FIG.
Here, a signal during heater wait is taken as an example, but it may also be a concentration recovery signal of the developer, or a signal until a drum surface potential is detected and a predetermined uniform potential can be detected. FIG. 8-1 is a time chart when the fixing device temperature is relatively low when the power switch is turned on.
WAIT signal S ₂ takes time T ₂ (approximately 30 seconds) from power-on
1 and is input to the R terminal of Q202 via a circuit including a noise prevention resistor R202 and a capacitor C203. After that, time T ₁ (approx.
50sec), the power-on signal _S1 is activated by the inverter Q201.
Q20 as a falling signal from 1 to 0 via
It is input to the TR terminal of 2. Therefore, at this time, the ROT1 signal _S3 is output as 1 from the output terminal Q, and the drum 2 starts rotating. When the wait state continues even after T ₃ , the first pre-rotation is performed for the time T ₃ (10 rotations of the drum) determined by R201 and C201, and the surface uniformity process (cleaning,
removal, pre-exposure, etc.) is performed and the drum is stopped at T ₃ . During time T ₃ , the photoconductor (direct diameter 5
~15cm) is approximately the time required for uniformity in the above process.
It is set to 30 seconds to prevent excessive rotation and equalization. FIG. 8-2 is a time chart when the temperature of the fixing device is relatively high when the power is turned on. That is, this is a case where the power switch is turned off and the power supply to the heater 202 is stopped, and then the heater 202 is stopped for a relatively short period of time. In this case, the various conditions of the drum surface have not changed significantly. For example, the sensitivity of the photoreceptor does not recover much and is close to the same as before. At this time, the wait signal _S2 may become 0 at time _T4 , which is shorter than time _T3 , and the wait state may end. Therefore, the signal _S3 becomes 0 at the same time as the wait state ends, the drum stops, and the first pre-rotation ends. Also, at least the first rotation is T ₅ (1 rotation of the drum)
When a time of T5 is required, the drum is rotated for a time of _T5 even if the wait time is shorter than _T5 . (Figure 8-4) As described above, according to the present invention, by giving priority to the wait state end signal over the predetermined first pre-rotation time signal, the first pre-rotation step can be executed for an appropriate time without providing extra waiting time. , and the longer the standing time, the longer it can be made. During this first pre-rotation, as shown in the time chart of FIG. 4, the lamp 3 and the like are turned on to uniformize the surface potential. In the figure, ROT2 and ROT3 are essential rotations corresponding to _T5 , and the latter lowers the output of the secondary charger to achieve a uniform effect. In addition to this embodiment, if the image quality can be improved the longer the pre-rotation process takes place due to differences in the configuration of the device or the type of photoconductor, it is possible to Conditions that make copying impossible: Even if there are various impossible conditions such as the presence or absence of transfer material and developer material, the first pre-rotation step should be executed as long as the power switch is turned on until the copying conditions are met. This allows you to improve the image quality of copies. Incidentally, if it is inconvenient to rotate the photoreceptor, such as when the transfer paper is jammed when the power switch is turned on, it is preferable to prohibit the first rotation. FIG. 13 is an example of a processing control circuit for a drum photoreceptor when a jam occurs. In the figure, 401 is a sequence controller that controls the operation of the copying machine in Figure 1.
The CPU controls each load according to the time chart shown in Figure 4. Further, output signal A of the sequence controller 401 is an operating signal for the main motor and exposure lamp that drive the drum etc. in FIG. 4, B is a signal for generating corona for pre-static elimination, primary charging, and transfer charging, and C is a signal for exposure. This is a signal that simultaneously generates a secondary corona, and D is a jam signal that is generated when a sheet jam is detected. Also, 4
05 is a timer circuit that delays its operation when the input changes from high level to low level, and its operation is as shown in FIG. Incidentally, in the case of other troubles, the output D becomes a detection signal for the trouble or a power switch cutoff detection signal. In the latter case, a backup power source is used as the power source for the loads 402 and 404 and the CPU. If the jam described in the operation does not occur, each output of the sequence controller 401 is generated in the time sequence shown in FIG. 4, and since the jam output D is not output, the input of the inverter 406 Output is 1, and timer 405
The output of is 1, so the AND gates 402, 40
3 and 404, normal copying operations are performed. Also, the output of the inverter 407 is 0
Therefore the jam display does not work. If a jam occurs during copying, a jam signal is set to output D to indicate the jam via inverters 406 and 407, and at the same time, AND gate 403
0 is transmitted to the input of , and therefore the primary, pre-transfer static elimination corona charger is turned off. Further, since the input of the timer 405 changes from 1 to 0, the timer 405 starts its timer operation from the point of change, and after a certain period of time _T10 has elapsed, its output becomes 0. This signal is transmitted to AND gates 402 and 404, and the exposure lamp, main motor, and secondary corona charger are turned off. A reverse clutch is operated to force the platen to return to the stop position (switch 35) between _T10 . That is, in the case of a jam, the primary, transfer, and pre-discharge coronas are turned off at the same time as the jam is displayed, and after a certain period of time _T10 has elapsed, the secondary corona, main motor, and exposure lamp are turned off. This time T ₁₀ ,
Primary charger 5 and secondary charger 6 in Figure 1
By setting the time to approximately correspond to the high potential area in between, the high potential area disappears due to the action of lamp light and secondary corona, and the memory remains or the high potential area is developed. Things will disappear. Also,
Generally, the distance between the primary charger 5 and the secondary charger 6 is not very long, so the time _T10 can also be shortened, and there is almost no possibility of further increasing the jam state. Further, in FIG. 1, the transfer charger 90
The drum between the front charger 24 and the pre-discharge charger 24 also has a slightly high potential, and it is also possible to set the timer time _T10 in order to uniformly eliminate the potential of this portion and bring it closer to zero. Furthermore, in a type of copying machine in which the fixing rollers 201 and 2 (these rollers are rotated by a main motor) are pressurized during copying using their rotational force, and the pressure is released after copying, pressure is applied. It is also possible to set the timer time T to the time required for release. This prevents the roller from being deformed due to being left under pressure during jamming. By the way, after the jam, as in the case of post-rotation after the completion of copying the preset number (referred to as post-completion rotation), the jam output D causes the secondary charge 6 and/or the lamp light to lower the applied voltage to them in order to weaken their acting force. It is also possible to bring the drum surface closer to zero potential. In addition, if the above-mentioned post-completion rotation T ₂₀ (ROT1′+ROT2+ROT3) time and post-jam rotation time T ₁₀ are different, in order to get closer to 0 potential and to eliminate potential unevenness, the voltage is set to 402 to 404 according to the time. It is also possible to operate a load of It is preferable that T ₂₀ > T ₁₀ . Further, the movement of the conveyor belt 19 is stopped during rotation after jamming, so that the jammed state does not become complicated. It is also possible to prohibit the post-rotation of the jam in the case of a jam near the drum, and to allow it in a jam near the fixing roller. FIG. 15 is a key entry, display, and sequence control circuit diagram. In order to determine the status of the start key 40, stop key 41, and numeric keypad 42,
Time-divided repeated pulses are output from KS1 to KS4. Each key is configured with its scan line and matrix, dynamically
Read the key state into memory. Then, when the copy start key 40, stop key 41, numeric keypad 42, and clear key 43 are input, the CPU 2 displays the 7-segment LED display 45, and stores the copy preset number by the numeric keypad 42 in the register RST (memory RAM) in the CPU 1. Store or
A control unit that controls the process sequence controls the start, stop and movement of CPU2. The display 45 converts the coded DISP signal, selects segments, selects digits, and dynamically displays them. Further, when the CPU 1 reads the above-mentioned various keys, it drives the key confirmation buzzer 50 for a short time (m seconds) to sound the key input and notify the operator. At this time, the control unit CPU1 determines whether copying is in progress,
During copying, the numeric keypad 42 is not read into the memory, and when a jam signal is received from the control unit CPU 2, the numeric keypad 42, copy start key 40, stop key 41, and clear key 43 are not read into the memory at that time. do.
Further, when the data is not read into the memory, the key confirmation buzzer 50 does not sound even if the key is turned on. The sequence control unit CPU2 is connected from the control unit CPU1,
Copy start command Copy start command and copy end command are received, and the clock pulse CL generated by the rotation of the drum driven by the main motor _M1 is received from the drum clock generator DCK and counted a predetermined number of times as shown in FIG. Control each load according to the time chart shown. As described above, the drum clock pulse CL is an important signal for sequence control, and the clock pulse may not be generated due to a failure of the main motor, a failure of the drive system, or a mechanical or electrical failure of the drum clock pulse generator DCK. If the halogen lamp continues to turn on, it will cause serious trouble to the copying machine. For this reason, the sequence control section
When counting clock pulses, the CPU 2 uses an internal timer and, if no clock pulses are input for a certain period of time, sends an abnormal signal to line 110 (BZ) as a clock pulse abnormality.
Output to. The operation time chart is shown in FIG. That is, the first timer DT1 is activated by the motor operation signal _M1 , and when a pulse is generated before the time-up of _T1 , DT1 is reset and the second timer DT2 is activated.
When the next pulse occurs before the time-up of _T1 of DT2, DT2 is reset and considered normal, and DT1,
Outputs BZ signal when pulse CL is not detected before DT2 time-up. So you can check the motor and all pulses. This causes the buzzer to sound continuously or intermittently (repeating the operation for several seconds) to notify of an abnormality. Furthermore, all the sequence operations shown in FIG. 4 are immediately interrupted to prevent a serious accident from occurring in the copying machine. In addition, the circuit DCK detects the holes in a disk with many holes provided on the drum shaft as a light change using a photo interrupter formed by _L1 and _R1 , and then outputs the transistor TR1.
Output CL from . As described above, the key confirmation buzzer 50 can be used in common to issue an abnormality alarm such as a stoppage of the main motor. Furthermore, it is also possible to detect abnormal lighting of a lamp, abnormal lighting of a heater, disconnection of the thermistor 204, jamming of a seat, etc., and issue an alarm using the above-mentioned buzzer. Furthermore, by changing the sounding cycle of the buzzer depending on various abnormal conditions such as jam, failure of the forward/reverse clutch, failure of various drive amplifiers, etc., it is possible to issue alarms for many conditions with one member. Further, depending on the abnormal state, the operator's attention can be aroused by expressing the abnormal state by voice. In this case, a speaker is used instead of a buzzer. Then, audio information is stored in advance as a code in the CPU's read-only memory (sequence program memory ROM or separately provided readout memory ROM), and the information is read out using a trouble detection signal and converted into audio using a well-known method. Voice expression can be achieved by outputting it to a speaker via an audio amplifier, and the speaker can also be used for key generation. Note that the functions of CPU1 and CPU2 can be executed by one microcomputer composed of a chip semiconductor including RAM and ROM, and this is collectively referred to as a CPU. Above and below sequence control, display warning,
Entry control etc. can be easily achieved by those skilled in the art using program software. (Jam Reset, Half Door Check) Hereinafter, the method of clearing the memory of a trouble state according to the present invention will be explained. FIG. 17 is a circuit diagram for displaying a jam, resetting the jam, and half-checking the housing door. In the figure, CPU corresponds to the detection means of the present invention, and 100 is a control unit that detects the sheet jam as described above, and 100 is a half-open state of the case door provided in the case door 101 corresponding to the opening/closing member of the present invention. This is a micro switch that detects when the door is open and indicates that the door is closed normally. 102 is a transistor that turns on when the door is ajar; 103 is an LED for indicating the door ajar state and the seat jam state; it corresponds to 49 in FIG. 3; 104 is a transistor that detects the closing of the door 101 provided on the main body 105 side. The door switch is turned on when the door is closed and turned off when the door is opened.As will be described later, when the door is opened, power to the heater, which is the image forming means of the present invention, is cut off. Reference numeral 105 corresponds to the storage means of the present invention, and numeral 106 corresponds to a capacitor for charging electric charge for resetting a jam. Reference numeral 107 corresponds to the storage means of the present invention, and includes a latch relay for holding a jam. 108(S) is a coil for setting the latch relay and turning on the switch 109, and 108(R) corresponds to the releasing means of the present invention, and is a coil for releasing the latch relay and turning off the switch 109. , 110 is the CPU
The transistors 111 and 112 are turned on by the jam detection signal JAMS.
109(R) is a diode for consuming induced current when turned off. Explain the operation. If the enclosure door 101 is now closed, the door switch 104 is on, so the CPU
The transistor 110 is turned on by the jam detection signal JAMS from the power supply V, and the set coil 108 (S) is set by the power supply V. This closes the switch 109, turns on the LED 103, and turns on the display 4.
9 indicates the jam status. Latch relay 1
This state is maintained even if the signal JAM disappears due to the action of 07. At the same time, input the signal JAM to the CPU to stop the machine. Thereby, the CPU executes sequence processing such as turning off the fixing heater, interrupting copying (before one process is completed), and rotating the drum afterward, as will be described later. When the door 101 is opened when a jam occurs, the door switch 104 is turned off, the LED 103 goes out, and the power to the CPU is also cut off. Half door switch 100
closes. By the way, the capacitor 105 is connected to the diode 106 before the door switch 104 is turned off.
When the door 101 is opened, the charged load is transferred to the reset coil 10 of the latch relay 107 via the switch 100.
8(R) and open the switch 109 as shown in the figure, the jam retention is released and the LED display etc. is not displayed when the door 101 is closed after the jam sheet removal process. Incidentally, since the charge in the capacitor 105 is retained for several tens of minutes, it is fully functional for releasing the jam after the power is cut off by the door switch 104. Therefore, compared to the conventional method of mechanically holding the jammed state using a spring, pawl, etc., and then releasing the jam using a manual button after the jam is cleared, the jam can be reset with an extremely simple structure. In the device of this example, there is a drum and a main motor that rotates it on the door 101 side, and a sheet feeding belt 19, a fixing roll 20, etc. are on the main body side 105, and these rolls and belts are also driven by the main motor with a gear 113. are connected (Fig. 18). Therefore, if the door 101 is not completely closed when the door 101 is closed after jamming, the gear 113 will not engage and if copying is started using the copy key, various parts of the machine will be damaged. In order to prevent such troubles, the door ajar switch 100 operates. That is, if the door is not completely closed, the door switch 104 is closed and the door half switch 100 is also closed. Therefore, the transistor 102 is turned on by the power supply V via the diode 106.
Connect LED103 to ground and turn it on or blink.
At the same time, a stop signal similar to that used when jamming is input to the CPU, making it impossible to start copying. When the door is completely closed, switch 100 opens and the LED lights up.
The display of 103 is stopped and the stop signal is also turned off to enable copying. Here, the door ajar switch 100 is linked to a lever 114 for manually opening the door 101 which is locked closed with the main body, and when the lever is opened, it is immediately activated and turned on, and can detect the subtle state of the door. can. FIG. 19 shows its operating state. 1
Reference numeral 15 denotes an interlocking lever, and the switch 100 is turned on by movement of the lever 114 in the direction of the arrow. It is also possible to distinguish the display by providing an LED for displaying the door ajar state and distinguishing it from the jam display, or by blinking the LED 103 when the door is jammed and turning on statically when the door is ajar. Furthermore, as described above, this half-door switch 100 can be regarded as a switch for resetting a jam, so that both the above-mentioned half-door check and jam resetting can be performed with one switch, making the control section extremely simple. (Killing a jam) In Fig. 17, a switch 116 is a switch provided on the circuit board inside the device, which prohibits the input of a machine stop signal due to a jam to the CPU, thereby allowing the copy run to continue to the end even in the case of a jam, that is, it is normal. It is what makes the lamp similar to the time. Therefore, copying can be performed without sheet feeding, and the operating status of the machine can be checked without paper loss. Explain the operation. When switch 116 is turned on
Even if the CPU outputs a signal due to jam detection, the signal is bypassed at 116 and does not turn on the transistor 110. Therefore, the latch relay 107
is not set and no jam stop signal is generated. Therefore, although the CPU performs a jam check, sequence processing such as turning off the heater, turning off the high pressure, and rotating the drum after rotation is not performed, and copying continues. (Process strength/weakness sequence) Fig. 21 is an operation time chart for one-sheet copying (A3 size), and Fig. 22 is a more detailed time chart for A3, two-sheet copying, and A4 manual copying. The halogen lamp is dimly lit during the first and second forward rotations and rear rotations (LA1). In this example, this weak lighting changes the light intensity by changing the lamp voltage in order to set the copy density, but the above-mentioned weak lamp lighting is a lighting state that is set to be equal to or less than the minimum light intensity of the set light intensity. shows. While the process is being executed, the light is turned on strongly, that is, it is turned on according to the preset intensity of light. During blank exposure, the drum is irradiated with light from the halogen lamp by opening the shutter 25 during non-image exposure. Therefore, during forward rotation and backward rotation, the lamp exhibits the same weak lighting mode as the lamp LA1. The copy cycle starts and the drum is irradiated with blank light without closing the shutter while the platen reaches the exposure start position. That is, at the start of the cycle, the lamp LA1 is turned on strongly, and the pre-irradiation light via the charger 1 is made strong. However, the area before the drum surface that is hit by the light is processed with weak light, resulting in uneven latent images. Therefore, the weak light processing area is subjected to blank exposure for strong light processing, and the time (for bringing the platen to the switch 30) is made to correspond to that area or more. Pre-exposure and full-surface exposure are lighting operations and intensity sequences synchronized with a halogen lamp. Since the intensity of the lamp is controlled as described above, it is possible to prevent the temperature of the platen surface and surrounding members from rising, and to maintain the life of the lamp. The secondary charger is operated at a low voltage in the second mode of post-rotation (ROT3). Because of that (-)
By weakening the corona component of the drum, it is possible to equalize the potential on the drum surface and approach zero potential when the drum stops after the post-rotation ends. The timing of switching the blank shutter and switching the voltage of the secondary charger is determined by counting a predetermined number of drum clock pulses. What is executed by clock counting is shown as CL in the clock count column of the time chart in FIG.
Note that the shutter 25 closes the blank light in response to a solenoid on signal (SHUT) from the CPU. Figure 20 shows the sequence operation status of platen light 5, full exposure 6, pre-exposure 2, and blank light 4, where a is the first rotation of the drum after the copy key is turned on, and b
c shows the drum during the second rotation and the platen is being exposed; c shows the drum during the fifth rotation and the platen is stopped. (Lampreguille) Figure 23 shows a circuit for switching lamp light.
In the figure, IEXP is the lamp lighting signal from the CPU, V1 is the output voltage for strong exposure set by a lamp regulator (not shown), and VR601 is the light amount control resistor Q209 is the light amount adjustment range by VR601 using the contrast lever on the operation unit. A circuit for setting the desired value and shifting the center light amount while maintaining that range, V2 is the output voltage for weak exposure, LINT is the one that outputs as a dimming signal and lighting signal to a lamp regulator (not shown), K201 is a relay to switch between strong and weak, SIEXP is a switching signal from the CPU,
LINTT is a voltage signal obtained by a light amount correction timer (not shown) that varies depending on the copy pause time length. Explain the operation. CPU synchronized with main motor
When IEXP is output from the regulator, a predetermined voltage V1 is output from the regulator so that the rated voltage is applied to the lamp at maximum light intensity. Dimming volume VR601 within the dimming range determined by R209 and R210
The dimming voltage is set by Q209, and Q209 outputs a strong signal voltage. Note that the voltage is shifted and adjusted by a resistor VR206. Furthermore, when the machine is put into a copying hibernation state and restarted, the sensitivity of the photoreceptor is recovered and high at first, so that the latent image becomes uneven in density between the first and several copies. Also, this unevenness occurs more as the pause is longer, and does not occur when there is almost no pause. Therefore, in this example, 1 regardless of the pause time.
The amount of light from the lamp is controlled according to the pause time so that the first and several copies can be copied with the same density. That is, a capacitor is provided that is discharged during the pause time and charged during the copy time, and the amount of light is corrected using an output voltage LINTT that corresponds to the charging voltage of the capacitor. In other words, the longer the pause time is, the lower the voltage LINTT is, and when copying resumes, Q209 outputs a set voltage that is slightly shifted down, and LINTT is set as soon as the copy is executed.
The set voltage of Q209 rises to increase the amount of light, and when the capacitor is fully charged, the amount of light becomes constant. Also, when the pause time is short, the voltage LINTT is not so low, so there is little change in light intensity. Capacitor rotates forward
It is charged and charged together with ROT4, and discharged when it enters the post-rotation ROT2. In addition, charging is not performed during the previous multi-rotation ROT1. This is because the pre-multi-rotation ROT1 is a rotation that does not contribute to latent image formation, so no light amount correction is performed.
During the pre-rotation ROT 1, the photoreceptor is weakly exposed to recover the sensitivity to some extent, and a stable latent image is formed by correcting the amount of light in conjunction with the pre-rotation ROT 4. Here, the discharging time of the capacitor is sufficiently longer than the charging time. The level H (strong exposure) of the exposure signal SIEXP from the CPU, which is output at a predetermined timing, turns on relay K201, so Q is output as the light control output LINT.
209 strong signal voltages are output. During the forward and backward rotations, SIEXP is at level L, so as described above, the weak signal voltage of voltage V2 is output as the dimming output LINT. Incidentally, a lamp regulator is known from Japanese Patent Application Laid-Open No. 51-90180 filed by the present applicant, and the circuit 209 is described in detail in Japanese Patent Application No. 53-8273. (Drum Heater Control) In order to prevent the properties of the photosensitive drum from changing depending on the environment such as temperature and humidity, which would adversely affect copy image quality, a drum heater is built into the drum shaft. FIG. 24 shows a drum heater control circuit, in which reference numeral 120 denotes a heater extending in the longitudinal direction of the shaft;
TS1 and TS3 have thermoswitches installed near the bottom plate on the inside of the main body to detect the atmosphere of the machine, and the operating temperatures differ from each other. SW1 is the main switch of the operating section, and MS1 and MS2 are door switches 104 provided at the positions shown in the figure to turn off both power supplies.By opening the door 101, which is the opening/closing member of the present invention, the image forming means of the present invention can be operated. The heater 120 is energized. CB1 is a breaker, LF1 is a low-pass filter, and DS5 is a diode for passing a half wave to the heater 120. In this example, five heater energization modes are provided based on three conditions, TS1, TS3, and SW1, and the drum is heated with high precision. That is, if the drum is heated too much, for example at 45° C. or higher, the toner may fuse or solidify on the drum, so this risk can be prevented and the drum can be efficiently dehumidified and kept warm. In Fig. 24, main switch SW1 and door switches MS1 and MS2 are all in the OFF state.
The operating status is as shown in the table below. TS1 turns on (closed) below 32.5℃ and turns off (open) above 39.5℃. TS3 turns on (closed) below 16℃ and turns off (open) above 23℃. Drum heater H1 is 15W (when on),
Consumes 7.5W (at half-wave rectification).

[Table] In FIG. 1, in addition to the exhaust fan and intake fan, there is an exhaust blower near the fixing device for cooling the fixing device, document table, document lamp, etc. Figure 25 shows the circuit that controls the blower and exhaust fan, where FM3 and FM2 are the blower motor exhaust motor,
TS2 is a thermoswitch provided near the fixing device to detect the temperature of the fixing device, and SW1 is a main switch. Each has a fan motor, intake fan FM1
is synchronized with the main motor operation. Exhaust fan FM2 and blower motor FM3 are provided to prevent temperature rise, and thermo switch TS is activated when the power switch is turned on and when the power switch is turned off.
It operates when 2 is turned on. Note that TS2 is on when the temperature is 55°C or higher, and TS2 off is when the temperature is 45°C or lower. The intake fan of FM1 is installed on the side of the machine where the developer is located. Therefore the power switch
If you try to replenish developing toner with SW1 on, the toner may fly up in the air from the fan and contaminate the inside of the machine. Therefore, great care must be taken in toner replenishment. In this example, the intake fan FM1 is synchronized with the main motor. This fan is stopped when replenishing toner.
Therefore, the above-mentioned inconvenience can be prevented. The mechanical copy counter will be explained with reference to FIG. In the figure, CNT1, CNT2, and CNT3 are well-known mechanical counters that count and store the total number of copies regardless of the copy key or main switch, a total counter for B4 and A3 size copies, and a total counter for A4 and B5 size copies. When the copy counter is connected, +24V is supplied to the anode of LED203 through the copy counter coil, LED203 lights up, and Q2
Enter 0 in 04 to enable copying. If the copy counter is disconnected or removed, the anode potential of the LED 203 is 0V.
And Q205-1 is 0, Q204-13 is 1,
Q203-4 becomes 0 and copy operation cannot be performed. However, when the counter drive signal is output during copying, 0 is input to Q203-4, but the copying operation is still possible. Each counter is incremented by 1 by the small copy signal SCNTD and the large signal LCNTD. These signals are differentiated depending on the cassette used. Further, the output timing corresponds to when the platen moves to the inverted position. In this example, jam detection is performed by determining that when the paper detector installed at the exit of the sheet path does not detect the sheet at a predetermined time in the process, it is a jam before the detector, and also when the leading edge of the sheet activates the detector. If the sheet does not leave the detector within the timer time and the sheet is detected even after the timer is completed, it is determined that there is a jam near the detector (near the fuser), and in each case, the signal JAMS is activated. Output. Incidentally, they can also be differentiated and used for the above-mentioned rotation control and display control. [Effects] As explained above, according to the present invention, charges are accumulated in the closed state of the opening/closing member, and when the opening/closing member is opened,
By canceling the memory of the trouble state using the accumulated charge, the memory of the trouble state can be easily cleared with an extremely simple configuration.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an image forming apparatus according to the present invention;
Figure 2 is a sectional view of the document table in Figure 1, Figure 3 is a partial plan view of Figure 1, and Figure 4 is the
Figure 5 is a sectional view of the paper feed section in Figure 1, Figure 6 is a right front view of Figure 5, and Figures 7-1 and 7-2 are the same as Figure 1. Control circuit example diagrams, 8-1, 8-2, 8-
Figure 3 is the control time chart in Figure 7-2, Figure 9 is the control time chart in Figure 7-1, Figures 10 and 11 are example diagrams of the display control circuit in Figure 1, and Figure 12 is the power supply. Circuit diagram, Fig. 13 is a post-rotation control circuit diagram, Fig. 14 is an operation time chart of Fig. 13, Fig. 15 is a display entry control circuit diagram, Fig. 16 is a time chart of buzzer operation, Fig. 17 18 is a perspective view of the device shown in FIG. 1, FIG. 19 is a sectional view of the lock lever shown in FIG. 18, and FIG. 20 is a partial sectional view of the device shown in FIG. 1 showing the lamp light path. Second
Figures 1 and 22 are detailed operation time charts, 2nd
Figure 3 is the dimming set circuit diagram, Figure 24 is the drum heater circuit diagram, Figure 25 is the fan motor circuit diagram, Figure 2 is the fan motor circuit diagram, and Figure 24 is the drum heater circuit diagram.
FIG. 6 is a copy counter circuit diagram, in which 1 is a platen, 20 is a fixing roller, 2 is a drum, 3 is a halogen lamp, and 25 is a shutter.

Claims (1)

[Scope of Claims] 1. An image forming means; a switch that controls power supply to the image forming means in conjunction with opening/closing of a member for opening and closing a casing of the image forming apparatus; means for detecting a trouble and outputting a trouble signal; means for storing a trouble state based on the trouble signal output from the detection means; means for accumulating electric charge depending on the closed state of the switch; and means for canceling the memory of the trouble state using the charge accumulated by the accumulation means when