JPS59159179A - Reproducing and outputting device of image - Google Patents

Abstract

PURPOSE:To prevent a copied picture from being thicker or thinner than a fixed range by providing limitation to both reproducing levels of a thick range and a thin range. CONSTITUTION:The image reproducing/outputting device is constituted of each elements of an operating amplifier 526, constant current circuits 527, 528, a limiter 529, and a buffer 532. A drum surface potential output V1 is turned to 10V at the use of an original with thick density and turned to 12V at the use of an original with thin density. When the density of an original is thicker than previously fixed density, the original is moved in the thinner direction and an illuminating lamp is turned on so that proper exposure is obtained. When the density of the original is thin, the drum surface potential output V1 is limited to 8V by the limiter 529. Consequently, the copied picture can be prevented from being thicker or thinner than a fixed range.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying device having an automatic document exposure (hereinafter referred to as AE) device, and particularly to an automatic document feeder (hereinafter referred to as A).
This is related to the case where DF and 109) are used for all 1 changes. Conventionally, in this device, the optical system moves forward when performing preliminary scanning for AE, but during that time, AE measurement is performed, the texture of the document is read, and the value is held, and the value is held in the steady state. At a home position C (hereinafter referred to as home position B) located at a different point from the home position (hereinafter referred to as home position A), the optical system turns back and changes from forward movement to backward movement. And home position hK4'Usp
In many cases, the light emission 'M of the document exposure lamp is turned on to form an image in accordance with the density of the document obtained from the AE measurement.

However, in this case, the document feeding in the ADF and the DP
While the paper is being done, one threat and one scan for AE offing]? It cannot be done.

Therefore, the time required for feeding and ejecting paper from the ADF or for preparatory distortion of #'iAE may lead to a decrease in copy speed.

The present invention eliminates the above-mentioned drawbacks of the conventional method, and at the same time, the home position B in the preparatory position for AE measurement.
By changing ':<kj, it is also possible to change the AE measurement width or position Iff.

FIG. 1 shows this embodiment. Reference numeral 100 denotes a copy-like main body p, 2004d an external accessory V (in this case, an ADF) connected to this main body.

The main body of the copying machine and the ADF are shown in FIG. 2 (they are connected by No. 5).

33 is a photosensitive drum which rotates clockwise as indicated by the υ arrow. 50 is a main motor, and all drives including 33, 44 fixing device, 41 conveyor, 38 paper feed roller, etc., and optical system drive including 21 document illumination lamp are all driven by a chain (
(not shown).

Further, numeral 31 is a static pressure electric device, which causes a charge to be charged onto the photosensitive drum 33. Then, it is exposed to light at AA to form an electrostatic latent image, and then toner is deposited on the developing roller 34 in the device to form a DJ image. Then, the toner image is transferred to the transfer paper in the transfer distortion TIL device 40, and the paper is fed from the cassette 37 at a timing such that the leading edge of the toner image and the leading edge of the transfer paper match. The paper is fed by the rotation of the roller 38,
The paper is fed out by the registration roller 39. At this time, the document is exposed to light by the document illumination lamp 21, and the optical system including 21 moves in the direction of the arrow WVCKJ'ak.
lkshifx7:r” Utan M Mi9-24, 25°27
and 2B, and the image is formed on the photosensitive drum AA on the photosensitive drum 33 through the lens 26, and the entire surface of the document is exposed to light. 48 is a registration sensor.

The registration roller 39 starts rotating by the sensor, and the leading edges of the images are brought into alignment as described above.

22 and 23 are reversing sensors, and 22B is in the home position B"Q for preliminary travel during AE measurement, and at the same time the cassette 37 is in the small size IIJ and 15
．． This is also the optical system reversal position for A4 size, etc.). On the other hand 23
This is the inversion position of the optical system for a large size (for example, A3 size, etc.).

After the transfer, the Δζ optical drum 33 is cleaned by the cleaner brush 36 of the cleaner section 35, and then moved to the eraser 3.
20, it is electrostatically cleaned and can be used for the next charging. On the other hand, the transfer paper to which the toner image has been transferred is conveyed by the photosensitive dome and the paper sheet conveyance section 41, and headed for the fixing device.

At this time, the conveyance continues while being drawn downward by the suction fan 42. The copy paper is fixed by the fixing roller 44, and then the completed copy paper is discharged onto the paper discharge tray 47 by the paper discharge roller 46.

45 is a web motor that takes up the entire web for cleaning the fixing roller 44; 43 is a % whale transformer;
0 is a v1 heat fan that releases heat from the 21 lighting lamp.

Next, we will conduct a review 8A of the names and operations of each part of the ADF (11). First, operation 1' ``When Nagisa places a draft on the guide device tray J, the AF original atomic sensor 10 detects the manuscript.

Here, AF is the mechanism that constitutes ADF,
It corresponds to 300 in Figure 1 1, and 2
It performs one function together with 00, and 200 is D.
It is called F, and the system function is AF + DF.
In other words, it is called ADF.

AF is an abbreviation for auto feeder, and DF is an abbreviation for document feeder. In such a mechanism, reload the original and press the ADF start switch D in the operation display section.
When it is turned on, the pickup roller 2 descends. ,
After the predetermined time, the AF motor (not shown) rotates at the same time, and the top of the stacked documents (Dji, No. 5) begins to be conveyed completely. When the leading edge of the document being conveyed between 4 and 4 is detected by the AF timing sensor 11, the pickup roller 2 moves upward.

The document is then conveyed from the AP section 300 to the DFF 200.

When the leading edge of JjAzH is detected by the DF original sensor 12, the separation belt 4 is pushed down completely and the operation of the separation belts 3 and 4 is stopped. Then, after a certain period of time has elapsed, AF
The operation of the section will stop.

Also, when f'i,%DF urine document sensor 12 detects the leading edge of the document in the DF section, the presser roller 5 moves downward and the original document is removed.
Hold all 4. Then, the DF motor (rejected) starts rotating, and the DF section presser roller 5. Conveyance roller 6, belt drive roller 15. Turn roller 16° and discharge roller 8 rotate. This causes the original to move at speed 1, which is faster than A F 'i1S.
It begins to be transported in circles.

When the document passes the conveyance roller 6, the leading edge of the document is detected by the population sensor 13Vc, and from this point on, the clock pulse generated by the clock generator (if necessary) synchronized with the DF motor is counted. The presser roller 5 moves upward, and then the Dλ private line total surface route 7 and JfJtu
7 Get between the latin glass 20, all 1n1 belt 7
transported by.

When the population sensor 13 detects the trailing edge of the document, if there is a document to be fed next to the AF section, feeding of the next i document is started as described above. This document is waiting at the position of the DF original phase sensor 12. Further, when the number of pulses generated from the clock generation gain reaches a fixed value T, the DF motor is stopped and a C0PY 5TART signal is sent to the main body of the copying machine.

By the way, 49 is a potential sensor for measuring the surface potential of the photosensitive drum 33. In general, the surface potential of a photosensitive drum is as shown in Figure 3. Due to corona discharge, the drum surface potential is V. charged up to. and exposure point)A
At the exposure point A, where dark attenuation occurs until then, the document is irradiated by the document illumination lamp 21 and exposed to light corresponding to the document density generated by reflection. At this time, if the original is light, the amount of reflected light is large, so the V
The surface potential decreases to around L. On the other hand, if the document is dark, one reflected light ik is small and the surface potential does not decrease much. Therefore, by reading the entire potential of the table ml, it is possible to judge the density of the original. Next, a circuit diagram from measurement of the drum surface potential to control of the light amount of the document illumination lamp is shown in FIG. 5-1. In Figure 5-1, Q525 is an operational amplifier, and R50
1 and C501 constitute an integrator. As a result, the drum surface localization is integrated over a certain period of time, and this fff
Therefore, a curve as shown in FIG. 4 is obtained, and a lamp control voltage VLiNT for controlling the light t' of the original illumination lamp is created.Also, 530 is a transistor, 523V-1
These FETs constitute a gate circuit, into which the signal (e) shown in FIG. 6 is input. Also, 531 is a transistor, and 524 is a FET"t'. These constitute a seven-bit circuit 'k8F'J for resetting all the charges charged in C501. The signal (f) shown in FIG. 4 is input.As shown in FIG.
This function is realized by the operational amplifier 526, constant current circuits 527, 528, and limiter 529. banhua 5
As shown in the table of Figure 5-2, the drum surface potential output V at the time of saturation gA heather as shown in the table of Fig. 5-2.

is 10V, and when the original is pale, the drum surface potential is output.
becomes 12v. In addition, the chichi divider output V corresponding to the
2) If it is bright, it will be 16V, if it is pale, it will be 12V.Next, the profit of the differential amplifier 526 *8 FiA = 2,
For example, when Vl = l 6 v, the output of 526 is 4.
v, and the current flowing through the constant current (b) path is 15t=L.

Therefore, although VLiNT = 16v, the original S is skipped and the light is kept in the direction of becoming lighter.
Turn on the document illumination lamp.

On the other hand, if w, I is light, for example, if the drum surface potential output v1 is more than llv and is 12v shown in the table of Figure 5-2, the output of the differential multiplier 526 will be 8 m, The OV4 output, which is limited to 8V by the limiter 529, becomes 18V. Therefore, VL i NT=10v. Further, when the drum surface potential is between 10 Vρ≧ and 11 V, a graph having a linear slope is shown. This situation is shown in FIG.

VLiNT = 16- (R504 Incidentally, as will be described later, in this embodiment, the rotational speed of the social photosensitive drum 33 is changed. This is because it is used for two types of HB+, and when making a 1-size copy, select high-speed rotation, and when reducing or enlarging, select all low-speed rotation. In order to change the time constant of the integrator at this time, the circuit shown in the dotted line in Fig. 5 is set as R501.
With the change in process heat, the original 1 shown in Figure 8 was connected to the resistor in parallel with the resistor.
In order to always remove stains from the shaded areas on surface 11, the AE measurement time, t2, must be made variable.

Details will be described later.

Using the above method, the light and shade of the specific parts of the manuscript shown in Section 8 and 1 are determined, and the light of the bright lamp is used to trace the light of the light lamp during image formation.

Further, as mentioned above, limiters are provided at the upper and lower limits, and in order to accommodate as many types of Ijj and manuscripts as possible, they are provided with three open-adjustable limiters.

In FIG. 5, the first method is a level shift for 526. This is done by VRIOI. Next, the method of 2452 is "C? light control slope. This is done using R505 (which is regarded as iV'RI02 and a variable resistor). This is the curve shown in equation (1). As a third method, V R10 in limiter 529
It is 3. This is shown graphically as 0 in Figure 4.
corresponds to a point. Here, the adjustment method will be explained using FIG. 4. The zero point is determined by the first method described above. Next, use the second method to determine the slope of ■. Then use the third method to get 0
Determine the points and complete the adjustment.

Note that 109 shown in FIG. 5 is a high voltage transformer;
is a high voltage charger. This means that before measuring the shading of the original, the five-surface rectangular position f! : Measured by 49 sensors and controlled via 109 high voltage transformer. It performs so-called potential control. This is done by turning on the main power switch of the device, rotating the drum for a predetermined period of time during wait or standby before turning on the copy key, operating the three primary chargers, and setting the surface potential to a constant level using the senner. It converges to bring the device to its standard state.

In this case, a standard white plate is installed near the home position 22A (Fig. 1), the light is turned on at level 5 of the rung 21i slide lever 907, and the π1 position of the bright latent image created by the light reflected from the white plate at that time is Sen? 49, the view of the rung 21 can be controlled to converge to the bright potential 'lr localization. Lamp 21? 1) By measuring in a phantom state and controlling the charger 31, I! ilt Ei15? J'
It becomes possible to stabilize the i-position.

In the same figure, the lamp light intensity during AE measurement corresponds to the specific scene at position 5 on the density selection lever 907, but each unit in this embodiment FIG. 6 shows an operation timing chart and a flowchart of the section.

It is shown in FIGS. 7 and 8. The order of explanation will be the movement of the ADF and the subsequent copying sequence of the main unit when an operator uses the ADF to copy two originals.

As described above, after the operator sets a document on the document tray 1 in the AF section of the ADF, the ADF enters the operating state by pressing the AI)F start δ inch button. Then separate one piece at a time from inside me, D
When the document is placed in the 9r fixed position by the F section (0 point in Figure 1), the ADF sends C0PY 5TAR to the main body.
Send out the TJrK number. This corresponds to step 701 in FIG. 7, and in the copying machine main body, this C0P
Y Start the copy operation after receiving the 5TART signal. First, set the ADF 5TAR to prevent the ADF from malfunctioning.
Reset the T signal. This state remains reset until the inversion time at the end of the copy operation.

Next, in order to measure AE, the optical system begins to move forward, but at this time, in preparation for the AE measurement, the peak hold circuit of the AE measurement circuit shown in Fig. 5 is reset, so the AE shown in Fig. 6 (f) is
Generate IJ set signal. In addition, this human E reset signal is generated before the copying operation starts, and if the continuous copying operation is interrupted due to running out of toner or transfer paper during copying, this reset circuit is used to restart all copying. Since it is disabled, the sequence is such that the copy restart P = AE measurement is not executed in such a case. Now, the optical system that started the forward movement is at step 70.
As shown in 2, the vehicle continues moving forward until home position B is sensed. Then, when the home position B is sensed, the optical system changes from forward to reverse υ and is lit with the brightness of the document illumination lamp zsfnJA*.

This situation can be seen in (h) and (1
) is shown. In addition, the brightness of this standard is AE 61
It does not change every 1+ constant, but is always constant. In this case, the home position B is 22B in FIG.

T I 11. Since the optical system started the backward rabbit 7 production. 〒1
When 111 elapses, the sixth
(e) AE 6111 > l (m'f: occurs. This corresponds to step 703 in FIG. 7. Then, in step 704, after another 12 hours have elapsed, AJ! The 8th signal is stopped.
This is to measure the shaded area shown in the figure. Also, in Fig. 8, +α indicates the i3 light spot A and the surface 11 shown in Fig. 1.
Distance to 6th place 31st fixed point B) 'ii! Missing the mark? This is to correct the sleeves. By the way, the AE 4''F is determined by the time Tl and T2 after the optical system starts moving backward, but if all the drive sources are obtained from the main motor 50 as in this embodiment, the main motor's In the case of a willow whose rotational speed changes, the speed at which the optical system moves backward will naturally change.This will also affect the measurement width of the 1iAE measurement signal. If there is a continuous motor rotation speed and you want to always read the document density in the diagonal portion shown in Figure 8, set the AE measurement width t2 short when the motor rotates at high speed, and conversely set KdtZ long when the motor rotates at low speed. This is input to the %AE measurement terminal of the AE measurement circuit shown in Fig. 5, but the judgment of high speed or low speed is made by software. At step 705, the optical system rotates at a low speed during reduction and enlargement, and determines whether the optical system during backward movement has moved to the home position A. If the optical system has reached the home position A,
The light cover of the document illumination rung is determined to be the light cover of the document illumination rung based on the VLiNT signal corresponding to the lightness of image 1 obtained by the AE measurement, and the optical system advances to expose the document and form a latent image. Also, at this time,
Paper feeding is also performed. From step 706 onwards,
Same as photocopy sequence, but shown in Figure 1/'
The reversal position changes depending on whether the 1L37 paper cassette size is large size or small size. In other words, in the case of a large size, the optical system changes from forward to reverse with the 23 reversal sensor, and in the case of a small size, the optical system changes with the 22B reversal sensor.

The 2zBJst movement sensor operates at the home position as described above. In step 707, it is checked whether the predetermined number of copies has been completed, and if the predetermined number of copies has been reached, an ADF 5TART signal is sent to instruct the ADF to replace the original.

In response to this step 11, the ADFfC starts feeding or discharging the original document. In this embodiment, as shown in FIG. 6, since the number of copies is one per two originals, step 70
71ft: ADF 5TART will be generated immediately.If you set the number of copies to multiple copies.
They will turn on the halogen lamp while looking down at the next copy, but the timing to turn it on will be earlier, taking into account the start-up time of halogen lamps, etc. However, the time required for the reversal sensors 22B and 23 to turn on the halogen after reversing is naturally different. Therefore, by selecting the timer values T3 and T4 depending on the paper cassette size in step 706, this problem of kneeling can be solved.

In step 708, whether or not a predetermined number of sheets have been printed? If the copy operation is not completed, jump to [F] to repeat the copy operation. If the number of copies reaches a predetermined number, the optical system starts moving forward, moves toward the home position B IIC, and then moves to the home position B.
When reaching , the optical system stops advancing and the C0P from the ADF is released.
Y Look at the 5TAItT signal.

(Step 709) If the C0PY 5TART signal comes within 75 hours, this means that the ADF has completed feeding and discharging the original, so jump to [F] to start the optical system backward movement for AE measurement. - In the case step 710, even if the predetermined time T5 has elapsed, C0P is not sent from the ADF.
Y If there is no 5TART signal, home position B
In order to return the optical system currently in position A to the home position A, the optical system starts moving backward f. When the optical system returns to the home position AK, the optical system stops moving backward, and the series of copy sequences ends.

In addition, if the temporary measurement time of 1 m (Figures 6 and 8, 1) is increased, 5-111! Increase the integral time constant of the AE (b) path of J to make it equivalent to the inspection lid of ΦC times Kohi. Also, if you shorten it, make it smaller. This makes it possible to accurately perform A E 1iiJ control related to equal magnification and variable magnification.

This point can also be applied to other cover-up modes in which the running speed and drum speed change. Also, 1 target for side fall due to AE&'
Even if the i-state bias is 1L pressure, the EJ function is still valid, and even if the object to be measured is partially the original source, it is still a working oil.

In addition, some of the examples of AE and other books are read by the original preservation system such as manuscripts and pine autographs, converted to electricity number 1, and processed in the equipment that prints or transmits them. is also valid.If the time of s t is determined by pulses generated synchronously with the speed of the movement of the scanning system or the speed of rotation of the drum, the constant count (pulse The same goes for pil, which can be determined by

By the way, regarding the operation method, Fig. 9 shows the operation section 6900 is the operation panel 6, 9o1 is the cassette size display section, 9o2 is the + indicator display section, 903°, 905 are the upper and lower selection keys, 904, 906 is in the upper row.

Lower cassette selection display, 9o7 is copy rotation lever,
90g, AE selection key, 9o9 is clear key 910
is a numeric keypad. 911 is the jam display section.

912 is a 7-segment display, 9/3 is an interrupt display, 916 is an interrupt selection key, and 917 is a stop key 914
is the weight display lamp, and 918 is the power saving selection key. ! Regarding the single-machine interrupt in the selected variant, in normal usage, if you want to make an emergency copy during continuous copying, you can stop the current copying operation and execute the emergency copy. be. However, if you are satisfied with this operation method and only copy to the main unit without using the ADF, there will be no additional problems, but as mentioned above,
When using an ADF, there may be inconveniences in use in the following cases. For example, if multiple manuscripts are
When I was requesting coffee using DF, there was an interruption copy request when a series of copies were not completed.

When the 916 interrupt key is pressed, the copying sequence of the copying machine is stopped and the copying machine enters an interrupt state.
On the other hand, uncopied originals remain on the original tray. In this state, an emergency interrupt copy is executed, but in order to avoid changing the page order of the original before the interrupt state, it is not possible to remove the uncopied original remaining in the original tray 1. It's fleeting.

Therefore, it is better to prohibit the use of the ADF during an interrupt state. In this embodiment, when in the interrupt state, A
The use of the DF is prohibited, and the operation of the ADF start switch D shown in Figure 1 is prohibited.

918 is a power saving selection key, and 919 is a mode display section. 1゛] Electric mode is the normal fixing temperature setting,
For example, the temperature can be lowered by 180 degrees Celsius, and the temperature can be controlled at 150 degrees Celsius.
4 is generally used in the thermal monitoring method and the heating method.
It is la.

As mentioned above, when the mode is selected, the temperature of the closing roller 44 is reduced from 180°C to 150'C, for example.

At the same time, the display section of the operation section with stripes 9 K is turned off, except for the power saving selection display section 919, which contributes to power saving. selection key 91
It does not mean that the number 8 is added, but the 0 example is ij while copying.
The input of the t selection key is prohibited, and other operations such as when a jam occurs, during warm-up after turning on the power, or when saving power
Power saving selection key input is prohibited during subsequent warm-up and other times.

Therefore, input of the 1 power saving selection key is permitted only when the copying machine is in standby mode.

Furthermore, 918 is an alternate key, which is selected by pressing it and released by pressing it again.

Next, 908 is an AE selection key. Usually prioritizes AE
mode is selected. For example, when the power is turned on, the AE mode is given priority. Further, 908 is structured so that it can be used as a selection key and also as a display key. This AI selection key is also an alternate key, similar to the power saving selection key described above. In addition, the input of the AI selection key is prohibited when a jam occurs, or when an error occurs during two-bee B'& (detects an error and an abnormality in the camera, but detailed clearing is omitted). During copying, the OJ process changes when the optical system is switched from forward to backward, or so-called reversal, when copying the last sheet of continuous copying. Therefore, when the ADF is in use, the (b) signal shown in Figure 6 is activated when the last paper is reversed (
In this case, the ADF is for feeding the original.

During paper ejection, since the AE31jl is constant, EJ is performed before the preliminary scanning optical system force and J advance start.

902 is a manual feed display section. If you want to make a single copy of paper other than transfer paper (for example, a postcard, straw size, m, etc.) in the upper drawer 51 (in Figure 1), place the postcard or the like on the manual feed guide 54 and make the copy.
In that case, the + insertion lever 53 is lowered to prevent the transfer paper in the cassette 51 from becoming Japanese paper. This is detected when the manual feed mode is selected by pushing the + insertion lever 53 in one direction.If the manual feed mode is selected here, the manual feed display section 902 lights up in Fig. 9.For example, if the lower cassette is selected, If so, of course the lower cassette selection indicator 9
06 is lit, but even in this case, the manual feed lever 53
If you select manual feed, select 90 from the 906 lower selection display.
The display automatically switches to the 4-speed selection display, and at the same time, the manual feed display section 902 lights up. Of course, after switching to the upper row, manual operation of the upper row and lower row selection keys 903 and 905 is permitted. Also, when the manual feed lever 53 is selected, the manual feed display section 902 is displayed as described above, and at the same time the number of copies is displayed on the 7-segment display section 912.
Display on the kite sheet.

This is because manual copying only allows one copy in principle.
Furthermore, when manual feed mode is selected, the numeric keypad 91 is manually operated.
Input of 0 is prohibited, and if you switch the lever 53 to the hand side, even if the number displayed is a dog,
Switch to , and return the lever to enable input using the numeric keypad. AE is hand selection p 1111 copies included! -It's a brave rrc regardless of the old one.

In addition, the ADF start key is prohibited until the interruption key is turned on, the Sago stop key is turned on, the fishing transmission signal is removed, or the interrupt copy is made. j'j included → When the key is turned on, the number of cents of cohesive [ifJ+ l-1 ADF start key or &f- is stored during cohesing before completion, and ADF interrupt copy can be made eastward. The name of this place is Noreset Kaunori! If the photon is ÷, the self-cleaning j+ PC interrupt rJjj's copy mode will be returned)
X'6-, r's normal control is prohibited until the original number 4 is lost to 6 copies, at which time it automatically returns to copy mode 1; J, and the number of remaining copies in the previous mode is set. Full display t-, 1)
If the iJ mode is AE, the AE display will be displayed. By the way, if you turn on the copy key in the previous Cohi Zenben AE mode, the copy number display will be set to 1 (automatically).
Even if you do this, the AE mode of the AE display will not be set. Therefore, the operability is poor. Note that all keys including the AE key do not stop at 1'j: 3A when there is no paper.

The standby state is the wait time ii1 until the fixing heater reaches the cohesive temperature, and the standby state is at least the state of the machine before the drum starts rotating and after the drum stops rotating. Note that when the Nj 171 key is pressed, all power is cut off except for the power to the temperature control circuit of the fixing heater and the power to the microcomputer, which will be described later.

In FIG. 6, the drum is pre-cleaned by a cleaner and exposed to light by a lamp 32 to stabilize the drum until the scanning of the fifth document starts.

The inter-layer transfer charger 40 is inactive to prevent fatigue of the reeds and therefore of the drum. After the start of Otori 4t4 scanning, each charger operates until the scanning of the final document is completed, but then 3? After that, it is inactive until the start of AE measurement, and the 2-ftram beam IJ is brought to an equalized potential.
If left unattended after being used, it will stop. After another 2 hours, the main power switch was turned off, leaving only the microcomputer powered. After turning on the power saving switch 2
The same is true even if it is left unattended for some time.

If left unattended during jam, AE mode, copy number non-AE,
Returning to 1 is prohibited, but if 7'C occurs after 2 hours, the power is turned off as described above and the 1 display etc. disappears. 1PAE
, return to 1 means a certain period of time (30s) after the main motor stops.
ec) It is also possible to carry out this return control in synchronization with the drum stoppage by the main motor, or it may be a control that is carried out after a certain period of time has elapsed.

When the copy key 915 shown in FIG. 9 is pressed, the copying machine enters a copy sequence. A certain amount of time is required after the optical system starts preliminary scanning until it starts actual exposure. During this time, if you wish to cancel the copy operation, press the l-j 917 stop key to cancel the copy operation. That is, step 7 shown in FIG.
01, 702, 703.

704 and 705, it is possible to stop the copying operation until paper feeding starts; however, once paper feeding starts, the transfer paper enters the inside of the copying machine, so the copying operation continues. In this case, copying is performed by AEK, but
If it is possible to cancel, move the optical system (scanning system) to the home position 22B.
Stop at the position and wait. H “If U is left unattended for a certain period of time, M
As mentioned in "1", the home position is 22AK Aizuichi. , 22A
The AE display disappears in synchronization with the amount of water left, and the mode becomes non-AE mode. When waiting AE is divided by ax C, there are many AE;
? 1"i, but the scanning system remains at the position 22B, and returns to 22AIC after turning on the copy key. This is done while the drum is rotating for cleaning and pre-exposure.

that's all? ! 14'! ' The operation timing of the copying machine shown in FIG. 1 has been explained, but to explain the control section that operates these loads, FIG. 1 θ is a clock diagram of the control section. 102 is a microcomputer,
The basic operation of 102 is the power flow shown in FIG. Also, the timing chart regarding AI measurement is shown in the sixth
Shown in the figure. In the εB10 diagram, 101 is a control board. The aforementioned microcomputer is located on the 101 board, there are 103 buffers for other input protection, and 104 and 107 as drivers.

105 is a temperature circuit; as mentioned above, it is a circuit for checking the temperature fI'lJ of the fixing roller 44; 57;
-It's Lajita. , 533 is a driver that drives the roller heater t, 116 is N, h, 7 lags. 115 is a power switch, and by turning on the power switch 115, the copier L wait time is entered. This is because copying cannot be performed until the fixing roller reaches a certain temperature (51>K). At this time, it is generally considered to be wait up time, and the wait rung 914 shown in FIG. 9 is lit to notify this. Also, when the Mt source switch 115 is turned on, 1 is supplied to the power supply circuit 114 via the 43 power transformer.
(・Supplying power. And 24vDC and 5v
DC is supplied to each load and control board 101 (+Yti). iia is a DC load, 112 is an AC load, Q,
III is an AC driver for driving it.

106 is the illumination lamp light needle transmission part 1 including the fifth part 1.
08 shows the highest measurement failure on the drum surface. 1. The corona power of the Hatake pressure transformer 1. Sound is controlled. This is called a potential control circuit! Naturally, the AE6111 constant is also sent to the ]06 illumination lamp optical control unit.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a copying machine to which the present invention can be applied, Fig. 2 is a diagram of a copying machine to which the present invention can be applied, Figs. 3 and 4 are potential characteristic diagrams, and Fig. 5-1
[8I is the AE control circuit 1 circuit diagram, Figure 5-2 is its output diagram, Figure 6 is the operation time chart, Figures 7-1 to 7
5 is a control flowchart, FIG. 8 is a density measurement area diagram, FIG. 9 is a plan view of the operation unit, and FIG. 10 is a control block diagram. In the figure, 33 is a photosensitive drum, 21 is a document illumination lamp, 200 is an ADF, and 106 is a rung control circuit. Applicant: Canon Co., Ltd. No. 7-Do Figure 7-3 Figure 8 Akebonoji? Written amendment (method) June 0, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Indication of the case 1983 Patent Application No. 33222 2 Name of the invention Image reproduction output device 3 Person making the amendment Example Relationship with Patent applicant Location Tokyo Metropolitan University 1 (Katayanono Co., Ltd. 1, 3-30-2 F Kuko, 1st ward)
(Telephone number 758-2111) Name (698'l) Patent attorney: Gisou Marushima Rokufu Niru] Ji11' 5. Date of amendment order: May 61, 1980 (shipment date) 6. Subject of amendment Clearance letter A & H (2) side 7, detailed description of amendments and engraving of drawings (no change in content) = 707

Claims (1)

[Claims] (1) An image reproduction output device that detects the lightness of a document and controls the process, which is characterized in that both the reproduction level for dark areas and the reproduction level for light areas are limited. (2. An image reproduction output device according to claim 1, characterized in that the restriction level is made variable.)