JPS60227243A - Copying device - Google Patents

Abstract

PURPOSE:To prevent staining of a photosensitive body and wasteful comsumption of a developer by changing and controlling the irradiating region of an irradiating means for irradiating light according to a copying magnification. CONSTITUTION:An original placed on glass 14 of an original base is irradiated by an illuminating lamp 16 integral with a scanning mirror 15 when a drum 11 is rotated to the home position thereof. The light reflected thereof is scanned by scanning mirrors 15, 17. The reflected light image is imaged on the drum 11 in an exposing part 21 via a lens 18, a mirror 19 and a mirror 20. The drum 11 is thereafter destaticized by a destaticizer 23 and an electrostatic latent image is formed thereon by the full-surface exposure of a full-surface exposing lamp 24. The image is visualized as a toner image by a developing device 25. The toner image on the drum 11 is transferred onto transfer paper by a transfer electrifier 31 in succession thereto. The exposing region by the lamp 24 is changed and controlled according to the copying magnification.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a copying apparatus, and particularly to a copying apparatus that provides multiple copying magnifications.

<Prior art> In conventional one-to-one full-size copying machines, the pressure plate that presses the original is made white so that the light reflected from the area where the original is not placed is irradiated onto the photosensitive drum, and the area other than the original is illuminated. I was careful not to get any toner on it.

However, when making a reduced copy, the photosensitive drum corresponds to an area wider than the document placement surface, so the end portion of the photosensitive drum is not irradiated with light and that portion is developed. As a result, the photosensitive drum became dirty and toner was wasted.

Purpose of the Invention In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a copying apparatus having a plurality of copying magnifications capable of preventing staining of a photoreceptor and waste of developer.

<Example> The present invention will be described in detail below with reference to Examples.

The main explanation regarding the present invention is from pages 96 to 1 of this specification.
It is described on page 01. Also, please refer to the drawings, particularly FIGS. 33, 34, and 35.

An example of a copying machine having a same size mode and five types of reduced copy modes will be described below.

The present invention will be explained below using the drawings. FIG. 1 is a schematic cross-sectional view of an electronic copying apparatus, in which 1 is an ultrasonic element for jam stoppering, 2 is a static eliminator, 3 is an application roller, 4 is a pre-exposure lamp, 5 is a sharp cut and blank exposure lamp, and 6 is a lens. Guide, 7 is a paper remaining amount detection lamp, 8 is a separation roller, 9 is a timing roller, 10 is a main motor, 11 is a photosensitive tram,
12 is a shaft, 13 is a rotation direction arrow, 14 is a document platen glass,
15 is a first scanning mirror, 16 is an illumination lamp, and 17 is a second scanning mirror.
Scanning mirror, 18 is a lens unit, 19 is a third mirror, 20 is a fourth mirror, 21 is an exposure section, 22 is a front AC and gold charger, 23 is an AC charger, 24 is a front exposure lamp,
25 is a developing device, 26-1.26-2 is a cassette, 27-
1.27-2 is the transfer paper, 28-1.28-2 is the paper feed roller, 29-1.29-2 is the first conveyance roller, and 30 is the second conveyance roller.
A conveyance roller, 31 is a transfer charger, 32 is a conveyance belt, 3
3-1 and 33-2 are a fixing roller, 34 is a tray, 35 is a cleaning device, 36 is a storage box, and 37 is a caster.

Figure 2 shows the operation panel of the electronic copying machine.
1 is a reduced copy indicator that lights up during reduced copying. (
Open the sliding door completely. ) 42 is a 1-size copy indicator that lights up when a 1-size copy is being made.

(Close the sliding door.) 50 is a sliding door; in the case of a full size copy, the door is closed; in the case of a reduced copy, the door is completely opened, and the desired reduced size selection button 51 is pressed.

A cassette size display 52 displays the size of the cassette set in the main body. Additionally, if the cassette size is not appropriate, the appropriate cassette size will be displayed blinking.

53 and 54 are upper/lower cassette selection buttons.Press the button to select the upper/lower cassette.

Reference numeral 55 denotes a copy flexibility dial, which changes the dial scale according to the density of the original. For normal originals, set it to "5".

56 and 57 can make continuous copies of 1 to 99 sheets using the copy dial. When the desired number of copies is set by turning the copy dials 56 and 57, the number is displayed on the copy counter 47. When the continuous copy button 8 is pressed, the display on the copy counter 47 is once cleared to "zero," and counts each copy.

59 is a one-copy button, and when this button is pressed, one copy can be made regardless of the number of copies displayed on the counter.

Reference numeral 49 denotes a copy stop button, and if this button is pressed during continuous copying, the copying operation will stop after the copying at the time of pressing is completed.

43 to 46 and 48 are warning indicators, and if any one of these indicators is lit, the copying operation will not start even if the copy button is pressed. However, even if the replenishment developer check display 46 is lit, copying is possible.

Reference numeral 43 denotes an end/cassette replenishment indicator, which lights up when no cassette is set in the main body or when the paper in the cassette set in the main body runs out.

Reference numeral 44 is a cassette replacement indicator that lights up when the set cassette becomes appropriate during reduced copying. At the same time, the appropriate cassette size flashes on the cassette size display. It also lights up when an R-cassette is set during full-size copying.

45 is a paper feed check indicator that lights up when copy paper is jammed inside the machine.

Reference numeral 46 denotes a replenishment developer check indicator, which lights up when the toner (replenishment developer) in the hot unit becomes insufficient. However, it can be copied.

Reference numeral 48 denotes a weight indicator, which lights up when the power switch is turned on to indicate that the temperature of the fixing unit is nearer than the specified value (1/).

The operation using the operation panel will be explained below.

Turn on the power switch. The fuser temperature is at the specified value (170
℃) In the following cases, the wait display lights up and copying is not possible. Wait time is usually 3 minutes and 30 seconds.

For full size copying, close the sliding door completely and open the stand containing the cassette to be used (upper or lower cassette).
Select. If the appropriate cassette is not in it, replace it with a cassette that allows cooling.

When an R-cassette is set, the cassette replacement indicator lights up, and at the same time, all the cassette sizes except R size blink.

For reduced copying, open the sliding door to the left until it locks, then press the desired reduction size selection button. If the cassette replacement indicator lights up at this time, select the cassette whose cassette size is blinking and replace it.

Next, place the original on the glass stand. Actual size copying However, in reduced copying, only the dark side of the original is copied.

When copying one sheet, press the one sheet copy button.

When copying multiple copies, set the desired number of copies using the copy dial and press the continuous copy button to automatically copy the set number of copies.

If you want to stop the copying operation during continuous copying, press the "stop button" and the copying operation will stop after the current copying operation is finished.

An outline of the copy operation will be explained below.

When the power switch is turned on, the fixing heater is turned on, and when the temperature reaches a certain level, the wait lamp is turned off and the copying operation can begin.

If the lens position is not appropriate for the selected copy magnification, pressing the copy button rotates the lens drive motor and moves the lens position to an appropriate location.

When the lens position is appropriate, the main motor rotates and the drum begins to rotate forward. Before exposing the original, the drum should be
By rotating the drum by 50 degrees, the CdS of the drum is stabilized, and paper is fed to prepare for copying operation.

When the pre-rotation is completed, the original exposure lamp lights up and the developing device is activated. The optical system operates a clutch according to each speed and starts moving forward.

During full-size copying, all blank exposure lamps are turned off while the optical system is moving forward. During reduction copying, the blank exposure lamp in the area where the drum 2 is not irradiated with the convergent light for exposing the original remains lit even while the optical system is moving forward.

When the optical system reaches the respective reversal position of the selected document, the optical system drive clutch is disengaged, so that the optical system is reversed by the optical drive reversal spring. All blank exposure lamps are turned on again, the original exposure lamp is turned off, and the developing device is stopped.

One second after the optical system is reversed, the operation of the front AC and positive transfer charger is cut off.

The drum stops at the drum home position 2.8 seconds after the optical system is reversed. The purpose of this post-rotation is to eject the copy paper and at the same time eliminate any unevenness remaining in the CdS of the drum to stabilize it.

The operation will be explained process-wise according to FIG.

The surface of the drum 11 is made of a three-layer photoreceptor using a CdS photoconductor, is rotatably supported on a shaft 12, and starts rotating in the direction of an arrow 13 in response to a copy command.

When the drum 11 rotates to the normal position, the original placed on the original platen glass 14'' is illuminated by an illumination lamp 16 integrated with the first scanning mirror 15, and the reflected light is used for the first scanning. It is scanned by mirror 15 and second scanning mirror 17. The ratio of the first scanning mirror 15 and the second scanning mirror 17 is 1:3.
7! By moving at a speed ratio of , the document is scanned while the optical path length in front of the lens 18 is always kept constant.

The above reflected light image passes through the lens 18, the third mirror 19, the fourth mirror 20, and the exposure section 21, where it is sent to the driver A.
Image is formed on IJ2.

The drum 11 is charged (for example, +) by a negative charger 22.
After that, in the exposure section 21.

The image illuminated by the illumination lamp 16 is subjected to slit exposure.

At the same time, AC or - next and opposite polarity (for example, Dra A 1
A high-contrast latent image in 11 is formed on 11-. The electrostatic latent image on the photosensitive drum 11'' is then visualized as a toner image by the developing device 25.

Transfer paper 27- in cassette 26-1 or 26-2
1 or 27-2 is fed into the machine by a paper feed roller 28-1 or 28-2, and is fed into the machine by a first conveyance roller 29-1.
Alternatively, the photosensitive tram 1 can be moved by taking approximate timing with 29-2 and accurate timing with the second conveying roller 30.
Sent in one direction.

Next, the transfer paper 27 is passed between the transfer charger 31 and the drum 11.
The toner image of the tram 11'' is transferred onto the transfer paper during the passage of the tram 11''.

After the transfer is completed, the transfer paper is guided to the conveyor belt 32,
Furthermore, it is guided to a pair of fixing rollers 33-1 and 33-2, and pressurized.
The image is fixed by heating and then discharged onto the tray 34.

After the transfer, the surface of the drum 11 is cleaned by a cleaning device 35 composed of an elastic blade, and the process proceeds to the next cycle.

The symbols and functions of each element of the electric circuit used in the explanation below are shown below.

1. Switches MS 8 Continuous copy button signal MS17 Copy stop button signal MS23 Circuit cutoff when a jam occurs MS24 - Single sheet copy button signal MS25 Toner remaining amount detection MS26 Fixing heater circuit cutoff when a jam occurs MSL1
Same-magnification copy temporary lens position detection MSL2 Reduction eco-bi temporary lens position detection MSL3 Reduction II co-copy temporary lens position detection MSDI Upper and lower cassette selection buttons MSD2
Same size/reduction switching (slide/door) DS 1 Door switch DS 2 Door switch SW 1 Power switch SWD 1 Reduction size selection 2, solenoid SL O paper feed control SL 1 First register 5L2A, 1 single stage paper feed 5L2B Lower stage paper feed SL 3 Second, resist SL 4 Developer drive SL 6 Fuser drive SL 7 Actuate MS23.26 when jammed S
L 8 Lens motor control SLR lens lock control 3, 2 for narrow exposure lamp control 3 for HVTI control 4 for main motor, optical fan, cooling fan, pre-exposure lamp sharp cut lamp, 5 for LfJJ control 5 for HVT2 control Drum heater control KIOl 201 to the count signal of the preset counter
Continuous copy signal 801 Hopper motor control 4 Latching relay KC1 Fixing heater overload leg KC2 Optical system advance signal KC3 Single copy signal latch KC601 Temperature control abnormality activation 5, lamp PL 3 CCTSL irradiation (] Two-stage cassette paper Remain! KoP
L 4 CBS2 irradiation (lower cassette paper remaining MI4MωP
L12 Wait lamp PL21 Blank exposure lamp 0N (also 0N while the copying optical system is moving forward) PL22 Blank exposure lamp 0N (also 0N while the copying optical system is moving forward) PL23 Sharp cut lamp PLDI A3 cassette selection display PLD2 A4 cassette selection display PLD3 B4 Cassette selection display PLD4 B5 cassette selection display PLD5 Large universal cassette selection display PLD
6 Small universal cassette selection display PLD7
A4R cassette selection display PLD8 B5R cassette selection display PLD9 “Please check the cassette” display PLD10
“Please change to a flashing cassette” display PLDI
I “Please check the paper feed” display PLD 12 “Please check the replenishment developer°” display PLD 13 “Reduce” copy display PLD 14 “Equal size” Copy display 6, clutch (41 Equal size copy temporary optical system speed control C statement 2 Reduction I Copy Temporary Optical System Speed City C13 Reduction II
Copy temporary optical system speed control C statement 4 Fusing drive control 7, light emitting diode LDDI A3=6B4 Display LDD2 A3 A4R display LDD3 B4#A4R display LDD4 B41B5R display LDD5 A4 B5 Display LED 101 Preset counter digit display (seven segments) LED 102 Preset counter 2nd digit display (seven segments) 8, Motor M 1 Main motor M 4 Hopper motor M 5 Lens drive motor 9, Fan motor FMI Optical fan FM2 Heat exhaust fan FM3 Cooling fan 10, Hall IC QHI 1st Resist Signal <IRGP> QH2 Equal-sized second register signal <2RGl> QH3 Reduction I second register signal <2RG2> QH4 Reduction II second register signal <2R
G3>QH5 small size optical system inversion signal<SMBF
>QH6 middle size optical system inversion signal <MDBP>QH
7 Large size optical system inversion signal <LGBP> QH 9 Paper feed control signal <PUCP> QHII Optical system home position signal <5CHP> QH
I2 Drum home position signal <DHP> QHI3 Tiger A,,Cff Ivy signal <DcKP>Q
HI4 Image leading edge position signal <IRGP'> QHI5 Paper feed signal <PUTP> 11, Cd 5 CdS1 Upper cassette paper remaining amount detection Cd52 Lower cassette remaining paper amount detection 12, Heater H1 Fixing heater H3 Drum heater 13, Fluorescent lamp FLI Front exposure lamp 14, circuit breaker NFB 1 200VAC line NFB501 5VDC line NFB502 24VDC line 15, high voltage transformer HVTl Front AC, positive, transfer charging HVT2 Image forming AC charging 16. Transformer LvTl 100VAC to 24■DC15VDC conversion LVT3 20VAC supply Tl to heater temperature adjustment circuit
200VAC to loOVAc4m conversion T2O1 lamp lighting circuit (9,6VAC) T202 lap lighting circuit (
100VAC) Pulse transformer> Pr2O3 Original exposure lamp lighting pulse PT601 Fixing heater lighting pulse 1B, thermo switch TSL For drum heater (15°C or higher) TS2 For fixing heater (250°C or higher) TS3 Fixing heater overshoot (10°C) The names and meanings of the various electrical signals are shown below in 19, Thermistor THI, Fixing Roller Temperature Detection 20, Ultrasonic Element UST, Transmitter USR Receiver 21, Buzzer BZ601, Fixing Heater Control Circuit Abnormality Alarm Method.

A-B A or B cassette) A B-series cassette is inserted and installed AB-U AB or universal A universal cassette is inserted and installed.

ing.

A4 instant B5 A4) Wu B5 A4→B5 is selected A4Cl A4 size cassette A4 size cassette is inserted and installed A4RCI A4 reduction power AARA4 size cassette inserted BSL Black strip Sharp cut lamp lighting signal lamp B4 ->A4RB4) Woo A4RB4→A4R is selected B4=6B5RB4) Woo B5RB4→B5R
is selected B4Cl B4 size cassette B4
B5Cl with a B5 size cassette inserted and installed B5RCI with a B5 size cassette inserted and installed B5R size cassette with a B5R size cassette inserted and installed CCBP Continuous Copy Continuous copy button signal boot Button press CCMD Copy command signal Copy start command signal CCP
Continuous IJijft Copy 4 Words Copy CEP Cassette Input Cassette Soft Focus Signal Pulse CNTP Count Pulse Count Signal CPL Copy Latch Copy Lif When a copy command is issued and the signal becomes “l'° until the final copy is reversed CPOK Copy OK Copy”r1E44 DC
KP Drum clock pulse 1st paper feed signal DHP
Drum hole position Drum home position signal DRMD Drum drive Drum drive command signal DVL
D Developer drive Developing device drive, original exposure lamp lighting command signal F-H full, or, barfsa Installed HVTl with half-size cassette inserted High-voltage transformer Previous AC1-Next, transfer high-voltage transformer operation Signal IR3 Initial Rotation From DCKP signal during previous rotation until C Yon set PL signal is cut off ° “1” signal JAM Jam Jam signal LCNT Large size copy kart Large size counter signal Tsunt pulse LC3 Lower cassette select Lower cassette selection signal Dead LGBP Large size cassette Optical system large size reverse position signal LGCI Large size cassette Large size cassette is inserted and installed LOAD LOAD Counter load signal LPOK Lens position Lens position signal OK 0 LPUS Lower paper feed Solenoid activation signal Lenoid LPI Lens position 1 Lens same size position LP2
Lens position 2 Lenska Mausoleum”\■ position LP
3 Lens position 3 Lens power %hII position MD
BP Middle size oricina Optical system middle size inversion position signal No. MID Middle size oricina Original is A4 or larger 1:B4
The following signals: 0 Positive signal FDP Paper day detection Exit paper detection signal Pulse PEP Paper empty taper No paper signal Luss PEXP Pre-exposure Track number lamp lighting signal P
OWER power Power supply signal PUCP Pickup control Paper feed leg signal Roll pulse PuO2 Pickup control Paper feed control solenoid activation signal Roll solenoid PUR3 Power up reset Power up preset signal PUTP Pick up timing Paper feed signal G pulse RED Reduction Reduced copy selection signal 5CBP
Single copy button Single copy button signal Presto 5CFW Scanner forward Optical system advance signal De5CFWT Scanner forward Optical system advance signal delay signal timer 5CHP Scanner home position Optical system Baum position signal John 5CNT Small size copy Small size count signal Count pulse SCP Single Copy pulse Single sheet copy signal 5CR
V Scanner Reverse Optical System Advanced Signal SMBP Small Scythe Pack Optical System Small Scythe Reversal Island Position Signal 5MCl Small Scythe Pack Smono is SML with Izu cassette inserted and installed Small Original Original or A4 or larger Signal 5
SPDI Scanner speed li double optical system speed 5SPD2 Scanner speed 2 Reduction 1 time Optical system speed 5SPD3 Scanner speed 3 Reduction + 1 time Optical system speed 5TOP Stop Copy stop button signal TEP Toner empty pal Toner sakuyo copper No. 8 UC5 upper force set selection Upper cassette selection signal UICI Large universal force Large size cassette set installation UPUS is inserted Upper pickup Upper paper feed solenoid signal solenoid U2CI Small universal Small universal size force cassette installation set is inserted WKAC week AC bipol Weak AC charging activation signal stage IRGP First registration pulse Image leading edge signal Lust IRGP First registration pulse 5LI-th activation signal Lustash IRGS First resist solenoid signal Lenoid 2RGP Second registration pulse 2nd Resist signal - multi-s 2RGS 2nd resist pulse ft52 resist solenoid signal mate 2RG1 2nd resist one etc. Next, the Hall IC will be explained.

A Hall IC is an element that generates an electromotive force when a magnet approaches it. These electromotive forces are used as various signals.

The magnets are attached to the drum gear section, the optical rail section, and the feed control cam.

There are two magnetic poles, magnet L and magnet 2, in the drum gear part, and pole I CQHL 2 is installed on the rear of the machine.
, QHL3 has been investigated. Magnet 1 is Q)
When approaching 112, DHP”O°゛, magnet 2 is Q
) (If you approach 13, it will generate a 77 "O" signal due to intoxication.

The optical rail section can be divided into two parts: a magnet 3 on the back side attached to the first mirror and a magnet 4 on the front side attached to the second mirror.

When magnet 4 approaches QHll, LG
A signal of Bτ “0” is generated.

When magnet 3 approaches QHl while moving forward, Fr becomes 0. When magnet 3 approaches QH2, QH3, and QH4, 2RGl'"
It generates a signal of 7°゛0°゛, 7RG3"0" with 7 guns, and generates a signal of PUCP'"O" when it approaches QH9 while moving backward.

When the paper feed control cam rotates, first the left cam follower to which magnet 5 is attached approaches Q) (15) and generates the PUTP "O" (7) signal. Next, magnet 6 is attached. The right cam follower is Q
) (near l4 and generates a signal of -']'Te2F ``o'''.

The circuit will be explained below.

The type of cassette is detected as follows.

The type (size) of the cassette inserted into the main body is shown in the bottom row (-) as shown in FIG. The force L on the cassette surface a is detected by actuating four types of microswitches attached to the set table. Also, the signal -J- is "'DC controller 2'
', and lights up the size display lamp etc. of the f1 section.

In Figure 7, the microswitch MS12゜13 is either small size (A4.B5) or large size (A3.B4).
). (No Niss Small Size) The microswitch MS22.21 determines whether the cassette is an A-series cassette or a B-series cassette. (No. B series) Micro switch MS20.19 determines whether it is a universal cassette (a cassette that can hold paper of all sizes). (No: Universal) Microswitches 16 and 15 determine the presence or absence of a cassette. (No: Yes) Next, the case where the A4 cassette inserted in the lower row is selected will be explained.

In the circuit of FIG. 8, since an A4 cassette is inserted, MS 1 6 and MS 1 2 are cut in the direction of the dotted line shown in the left diagram.

Furthermore, by selecting the cassette IF selection button on the operation section, the MSDI is also switched in the direction indicated by the dotted line.

From what is written in Q210-11. Q210-2 is at °0°.

Q210-16, Q215-14 are "O", and the result is "O".

Also, AB-U becomes “0”, Q212-1 “0”, Q212-3, Q211-7 are °〇- Q211-9, Q215-13 are “Opa, so 0=゛o
” becomes.

Also, CEPL becomes “0”, Q212-5 is 0-Q212-6, Q215-12 is “o”, therefore 0-“O”
It becomes ゛°.

Q212-9.10 is 1- Q212-8. Q210-3 is °゛l°°, Q210-
15. Q215-15 is “T”, therefore [Yes] = “1”
becomes.

In other words, it can be seen that the input of Q215 becomes ■=“lpa,” and the other terminals become 1. (Q210.
Q211. An explanation regarding Q215 will be provided later. ) Q209, Q210, Q211 (latch IC) are the 9th
It can be divided into four equal blocks as shown in the figure.

When the latch signal C="1", the signal that enters the input is output from the output Q as it is.

When the latch signal changes to C-'0', the previous state is maintained even if the input signal changes.

In the actual circuit, the latch signal is used only during copying.
However, even during copying, the angle temporarily becomes l'° when the optical system is reversed.

In other words, even if you switch the cassette selection button and variable magnification mode button during copying, until the optical system is reversed,
Q210. The output signal of Q211 does not change. That is, if the cassette selection button and variable magnification mode button are switched before the optical system is reversed, the cassette and magnification are switched when the optical system is reversed.

Decoder Q215 inputs ■■ Outputs 00 according to the table below.
Convert to ■■■■■.

(If l" is input to input 0, outputs O to ■ are all 1 degree.) Next, reduction ratio selection will be explained with reference to FIGS. 1O and 11.

As example 1, when reducing B4=>A4R (longitudinal feed of A4) is selected, the contacts of MSD2 will be in the state shown in the above diagram by opening the "equal magnification reduction switching blade bar °" on the operating section.

Also, by pressing the B4 → A4H button, the SWD
The contact point from B4 to A4H in 1 switches in the direction of the dotted line.

From the above PL13 lights up.

Qol “ON”.

LD03 lights up.

B4 groan A4R display.

In the explanation of the operation below, the arrow means to proceed to the next step when the previous condition is satisfied.

For example, means that when the input terminal 9 of the driver 229 is 0, the output terminal 8 and the input terminal 7 of the latch 209 are 1, and the output terminals 8 are l and o.

The explanation will be given below in this order.

As an example 2, when the "same size reduction selection power barper is open, none of the reduction size selection buttons" is pressed.

°“If none of the reduction size selection button buttons are pressed, all contacts of 5Wol' are closed, so the issuing diode (LD o 1) described on the previous page
LD o 5) are all blinking.

(Note that 5WDI' is linked to SWOT, so it can be treated as one switch.) Next, the display of the cassette size will be explained using FIG. 12.

As example 1, when an A4 cassette is inserted for a same size copy, the following will be obtained.

Also, when A4 cassette is selected, all outputs of Q215 except Q215-2 are t'', and when same size copy is selected, Q209-1o, 15, 16...
Q210-9. to is now “O°゛. From this, Q
219-11゜6.3. Q213-All 1 on 8.11
″.

In other words, Q226 shown in the left figure. Since all the lamps except Q221°-6 are O'', only PLD2 (A4) is lit and the other lamps are not lit.

As example 2, B4. Even though I selected A4R reduced copy, A
When cassette No. 3 is selected, the A4R cassette is not selected, so Q215-7゛1", that is, Q221-1 "1'.

Since the reduced copy of A3=6A4H is not selected, 1 → Q221-2 "t" Since the reduced copy of A4R in B4 is selected, on the other hand, Q2
Since 19-2 is connected to the oscillation circuit, l"°→"0
”′→“l”→“′o′”-1---Repeat.

In other words, Q219-3 and Q22m-13 also oscillate.

Because of the above, since Q221-12 also oscillates in synchronization with the output of the oscillation circuit, PLO7 (A4R) repeats blinking.

That is, the display lamp always displays the selected cassette, and if the selected cassette is not appropriate, the display lamp of the cassette to be selected flashes.

As will be described later, when the cassette size manual lamp flashes, the ``Please change to a flashing cassette'' warning lamp also lights up.

Q227. Q228. Q22. Q23. Q24 (hammer driver) can be divided into seven equal blocks as shown in FIG. (A kind of inverter set) When l is applied to the input, the transistor is turned on and the output is grounded (°"0°").

Next, the display of the cassette check lamp and the cassette replacement lamp will be described using FIGS. 14 and 15.

If the "Please change to a flashing cassette" lamp indicates a full-size copy, and the cassette is marked "A4R" or "B5R"°.

Since 1-size copy has been selected, Q209-8°°l"L-Q222-11" Since A4R or B5R cassette has been selected, the message "Please change to the blinking cassette." “The lamp lights up.

Next, make a reduced copy if the selected magnification and cassette are not appropriate.

As an example 1, when "'A3→A 4 R" is selected, if A4R cassette is selected, Q215-7 "O". From the above, at this time, Q222-4'"1゛°, so Q222-
6 “0” and PLD 10 does not light up.

As an example 2, when "A3φA 4 R" is selected, if B4 cassette is selected, from the above, since reduced copy is selected, "'A3=6A4R" is selected, that is, Q2
25-9.10.11 are all 1°", so please check the cassette °° lamp. First, if the cassette is inserted into the main body.

In other words, the ``Please check the cassette'' lamp lights up.

Second, if there is no paper in the cassette, the ``Please check cassette °'' lamp will light up.

Next, the copy command signal CCMD will be explained using FIG. 16.

WAIT is “0°” when the fuser temperature is less than 170°C.
Therefore, even if the wait lamp PL12 lights up and the copy button (MS8 or MS24) is pressed at the same time, the copy operation will not begin.

When the temperature of the fuser is 170°C or higher, WAIT becomes "l", so the wait lamp goes out, and at the same time, if you press the single copy button (MS24) or the continuous copy button (MS8), [→CCMD'"i" A copy command (CCMD-"1°') is sent to each control section through the above route.

In addition, the CCMD is “°1’° until the optical system is reversed for the final copy.
hold.

Next, the operation of copy command signal holding relay KC3 will be explained using FIG. 17.

Kc3 is a latching relay, Q24-15, once “
When it becomes ``o'', it becomes ``ON'' (Cera)・) and mechanically maintains the ``ON'' state, and Q24-13
O°'t: I can't turn it off (reset).

The following two cases can be considered for Kc3 to become "ON" (set).

L-Q20-4 “0”.

L-+Kc3 “ON” → Kc3 '“ON” Kc3 is set in any of the above states, that is, Kc3 is set when the single copy button (MS24) is pressed or by the paper feed signal during continuous copying. be done.

In order for Kc3 to turn “OFF” (reset), the following two steps must be taken.
Two cases are possible.

Firstly, PUR3 is ``O'' and the power is ``ON''' Secondly, when 5C) IV and 5CFW are ``1°'' and in any of the above states, Kc3 is reset, that is, when the power is turned on - It is necessary to reset Kc3 by setting it to m ``o'' for a moment.Furthermore, resetting during copying is performed when the optical system reaches the reversal position while moving forward.

CCMD is from "1' to O" at the optical system inversion position of the final copy.
’”.

Next, lens driving will be explained using the circuit shown in FIG. 18.

The position of the lens must be moved depending on the selected copy magnification.

If the position of the lens is not appropriate for the selected copy magnification, the copy button is pressed to drive the lens, and only after the lens stops at the appropriate position does the copying operation begin.

MSLI, 2.3 is a microswitch for detecting the position of the lens.

The table below shows the relationship between the reduction ratio, lens position, and optical system speed.

First, when the lens is at the LP3'' position,
3-6A4R'" is selected. A3->A2B "O"]
3#B4" is selected] Due to the two-legged relationship, when the copy button is pressed in this state, the lens drive motor (A5) operates and the lens moves, resulting in "L P 2 '" When the position is reached (reduced copy is selected, so RED is "1"), it turns into a sweep from the above, the lens stops, and the copying operation begins. (Described later) Note that SL8 is connected to the spring crat “OFF”
”, conduction from the lens drive motor is cut off.

On the other hand, when A3=6B4 is selected, the lens lock release solenoid (SL!() does not operate).

In other words, when "reduction machining" is selected, the SLR does not operate.

For SLR, CCMD is "1" when the same magnification or reduction II is selected and the lens position is inappropriate.
It will not work unless it is.

In the case of equal magnification and reduction II, the output of the copy enable signal CPOK will be explained next with reference to FIG.

In order for the copy enable signal CPOK to be output, there must be no jam. (Tim “1”) Fuser temperature 17
Must be above 0°C. (WAIT""l") The copy must be the same size. Or. One of the magnification selection buttons must be pressed at the same time as the reduced copy. (Q203
-8”1”) The lens position is appropriate. (LPOK゛lpa) The “°Please change to the flashing cassette°” lamp is off. (PCI L “1”) ゛Please check the cassette゛The lamp is off. (PC
EL "'1") Even one of the above conditions must not be missing.

In other words, Q202-1 to Q202-6 must all be "1".

Then, the copy operation becomes possible.6 Next, the output operation of the copy signal CPL will be explained using the time charts of FIGS. 20 and 21.

If you press the copy button when copying is possible, (
CPOK “1”, CCMD “loo”) copy signal CPL
becomes “1°” and the recopy operation begins.

Also, from this point onwards, the latch signal is input, so Q2 is in this state.
Even if the input signal No. 11 changes, the output CP maintains the "1" state.

For example, if the paper in the cassette runs out or a jam occurs during continuous copying, even if CPOK becomes 0, CPL remains at 1°, so the copying operation does not stop immediately.

When the optical system reaches the inversion position, it becomes 5CRV'"l", but in reality it becomes Rc242. Cc216
As a result, the timing at which Q218-9 becomes "0'" is delayed, so Q218-8 momentarily becomes "o".

As a result, the latch signal is cut off, and at this time, CPOK is "0".In other words, if the paper in the cassette runs out or a jam occurs during continuous copying, the copying operation will be stopped immediately. Instead of stopping, the optical system reaches the reversal position and then stops.

Note that Q218-8 only momentarily becomes 0'°, but Q205-1.2 becomes "l", so the latch signal (Q
211-13) held the ``lpa'' and later CPOK``l
”, the CPL becomes “l” again.

Next, regarding the drive of the main motor, Fig. 22, Fig. 23,
This will be explained using FIG. 24 and FIG. 25.

As shown in FIG. 23, when relay 4 is activated, the main motor (M l ), optical 7-amp (FMI), and cooling fan (FM3) are activated.

The main motor drives everything except the hopper, lens, and fan motor.

Relays 4 and 5 operate under the following conditions, and the main motor etc. operate.

First, when the drum is not at the home position, the drum rotates unconditionally when the drum is at a position other than the home position, and stops when the drum reaches the home position.

However, if the main switch is turned on while the drum is stopped within approximately 2806 points before the home position,
First drum home position signal (TfTr7”
o”), the drum does not stop, but stops at the second drum home position signal.

As shown in the timing chart of Figure 24, the first home position signal is delayed by T3 (1.8 seconds).
If it comes out within °, it becomes Ql 3-12"l II, but Ql
9-4 Since it is 0 pa, the drum makes one more revolution.

(Same operation as post-rotation) Next, the copy signal CPL is “l”°
When , it becomes .

Also, when the final copy is completed, the copy signal CPL becomes "1".
As shown in the time chart in Fig. 25, when the optical system changes from 0° to 0°, the copy signal CPL immediately changes from 0° to 0° as soon as the optical system inverts the signal (SCRV is 1). However, since it goes through timer circuits T2 and T3, Q20-2 (Q
l9-4) changes from "O°" to I11 with a delay of 2.8 seconds.As a result, the drum rotates more than one rotation (post-rotation) after the CPL reaches "0°°" and returns to the home position. Stop in position.

In the case of large size copying, as soon as the optical system reaches the reversal position, CPL changes from 1'' to 0 degrees, but Q8-11 does not change from 0 degrees to 1 degrees at the same time.

From the above, in other words, during W"°0pa (approximately 0.1 seconds), Q8-11
“O” Te, 2”1” 4. : Su-) Dekara 2.8
After a second, Ql 9-4 changes from "0'° to "1°.

Changes to

Next, the solenoid SL6 for driving the pre-exposure lamp, sharp cut lamp and fixing device will be explained using FIG. 26.

When relay 4 becomes 'ON' and the -4 contact is closed, PL15 to PL18 and PL-23°3L6 operate, and when the K-4 contact opens, all become 'OFF'.

In other words, when the drum is rotating, the pre-exposure lamp and sharp cut lamp are always lit, and the fusing drive solenoid is activated, causing the fusing roller to bite.
Rotate.

When the drum stops, the pre-exposure lamp and sharp cut lamp go out, and the fixing roller is released and stops.

Next, the operation of the working AC high voltage transformer HVT2 will be explained using FIGS. 27, 28, and 29.

The positional relationship of the drum, blade, corona discharger, etc. is as follows.
As shown in the figure.

As shown in FIG. 28, the second lance operates for 0.8 seconds from the time the copy button is pressed, which is a little over one rotation of the drum after the exposure of the original, which is different from the copy operation. In other words, the AC static elimination effect is weakened.

First, the reason for weakening the AC static elimination in section a will be described.

After the copy button is turned on, all the chargers operate at the same time as the drum rotates.

However, the surface potential of the drum 306 part in the above figure is low due to the AC charge removal in the previous copy, and since no positive charge is applied, the surface potential becomes too low when a strong AC corona is applied, and the carrier on the drum may become attached.

In order to prevent this phenomenon, a weak AC corona is applied to the drum 120@ after the drum rotation starts.

Next, the reason for weakening the AC static elimination in the 0 part will be described.

From the end of exposure of the original until the first transformer is turned off, the potential on the drum surface is low due to the brush exposure + AC static elimination. Furthermore, since the drum rotates more than once, there are parts where static electricity is removed twice.

Therefore, the potential difference on the drum surface becomes large.

To prevent this, the AC corona is weakened at the same time as the original light exposure ends.

Next, the reason for extending the operating time in section d will be explained.

When a jam occurs, the drum does not stop immediately, but only after reaching the home position.

In addition, since there is no brake on the drum, if the main switch is turned off after a jam occurs and before the drum stops, each charger will immediately turn off, but the drum will stop charging due to inertia.
There is a possibility that it will continue to rotate around 0 degrees.

When the main switch is turned on again, the portion rotated by inertia passes through the developing device without being neutralized. To prevent this, a capacitor is installed to delay the fall of the AC corona when the main switch is OFF.

As shown in FIG.

When the K5 contact is open, no high voltage AC output is produced.

If QRI turns "ON" while the K5 contact is closed, a weak high-voltage AC output will be output.

If QR2 turns "ON" while the K5 contact is closed, a strong high-voltage AC output will be produced.

The conditions for a weak high-voltage AC output are that a copy signal is not output (CPL "'o") and the optical system is not at the large size inversion position.

(Q7-11'"1 Pa") The first reason why a strong high voltage AC output is output is when the copy signal is output.
This is the period from 0.1 seconds after the copy signal is cut off.

5'"O°" (Normally, about 1 second after the drum starts rotating, the 4AC copy signal CPL changes from "1" to 0°, Q
l4-5 changes from 0°° to "l°" almost simultaneously, but since inverter E is also a 0.1 second delay circuit, Q
l4-4 holds "O'" (strong AC) for 0.1 seconds and then changes to "i" (weak AC).

This is to prevent the trailing edge of the copy from becoming black when a legal size copy is made.

Second, when the optical system is in the inverted position of the large size,
3411i1 Relay Q14-6 (TTS”) Holds t*″゛0゛.

This self-holding circuit has a CPL of "1° to 0".

It is canceled when the value changes to .

Next, pre-static neutralization AC, plus high voltage transformer for transfer HVT1
The operation will be explained using FIG. 30, FIG. 31, and FIG. 32.

As shown in FIG. 31, when relay 3 is activated, high voltage transformer HVT 1 is activated.

Relay 3 operates under the following conditions.

First, when the copy signal is output (CPL “l”) CPL
"1" 3 "ON" to L- [→HvT1 "ON" Next, when the optical system is in the large size inversion position (however, DRMD "l") L4HVTI "ON" Figure 33 shows the lighting of the full exposure lamp for 1 second after the temperature changes to '°.

This will be explained using FIGS. 34 and 35.

As shown in FIG. 34, when relay 2 is activated, the full exposure lamp (FLI) is turned on.

Relay 2 operates under the following conditions.

When the copy signal is out ( ] tap “O” ) or D
Approximately 1 second after RMD changes from "0" to "°lpa", the reverse FLI lights up and the next lights go out.

(by timer T4) This is because the AC blank area prevents the phenomenon.

Next, the lighting operation of the blank exposure lamp will be explained using FIG. 36.

As described above, PL23 is a lamp for sharp cutting and is always lit while the drum is rotating.

(Irradiation of Fig. 36) During equal part copying, all blank exposure lamps are turned on when the drum is rotating and the optical system is not moving forward.

However, in the case of reduction copying, the light focused by the lens is directed toward the separation side (front side) of the drum surface, so the light does not hit the rear surface of the drum. If you develop the image in this condition, toner will stick to the back of the drum. In order to prevent this phenomenon, in the case of reduction I, even when the optical system is moving forward, the PL2
1 is turned on to irradiate the area C in Fig. 36. Also reduced I
In the case of I, PL21 and PL22 are turned on even when the optical system is moving forward, and the portions shown in FIG. 36 and 0 are irradiated.

For example, if A3-B4 (-manual) is selected, L+Q21-11, Q21-2 "l" When the drum starts rotating when the optical system is not moving forward (PL23 will light up at the same time as the drum rotates due to 4ON in the relay) ) When the optical system starts moving forward (drum is rotating) Q21-4
In the case of LP2, PL21 lights up even when the optical system is moving forward, and illuminates the back surface of the drum (section C in Figure 36). are doing.

Also, the lamps PL23, PL8, PL22 depend on the state of the reduction ratio and the state of the drum and optical system.

The lighting state of PL21 is shown in the table below.

Next, the paper feeding timing operation will be explained using FIG. 37.

Paper feed control solenoid SLO allows Hall E CQH15
From…■ “0” signal is output.

Depending on the signal, paper feed solenoid 5L2A or 5L2B is
The paper feed roller moves down and feeds the paper to the transport roller l, where it forms a loop.

Next, by the same <SLO, from Hall ICQHI4 to old E
7 “θ” signal is output. TT? 7"O turns on the first resistor make SLI, during which time the conveyance rollers 1 and 2 rotate, feed the paper, and stop rotating.

When the optical system starts moving forward, the rir is detected by the Hall ICQHI.
+ “o” signal is generated. That signal causes SLI
is "ON" L again, the conveyance rollers 1 and 2 rotate, and the paper is fed to the timing roller, where it forms a loop and stops.

When the 2RGP signal corresponding to each reduction ratio is generated, SL3 is activated, the timing roller is rotated, and the paper is fed. There, the paper ends up edge-to-edge with the image on the drum.

Next, the operation of the paper feed control solenoid SLO will be explained using FIGS. 37 and 38.

The paper feed control solenoid SLO is a paper feed solenoid (SL2A) that directly controls the paper feed roller.

This is a solenoid that controls the cam for operating the 5L2B).

The signal that activates this solenoid (S L'O) is
It differs between the first sheet in single-sheet copying or continuous copying and the second and subsequent sheets in continuous copying.

For the first sheet during single-sheet copying or continuous copying, πKF is applied when the copy signal is output as described on page 2-34.
When it becomes "O"] 3 changes from °"1" to °0.

Then, as shown in the time chart of FIG. 38, Q7-8 changes, that is, the paper feed control solenoid is energized while Q7-8 is at "0°" for one sheet.

After the second copy of one continuous copy, It is activated by the paper feed control signal m″θ′°) while the optical system is moving backward.

(QH9 is attached to the optical system rail part) While the optical system is moving backwards From the above, when the optical system of the final copy is moving backwards, the CPL is 'o°', so even if the PUCP is 'O'. Q8-4"
It does not reach 0°'. In other words, the paper feed control solenoid is not energized.

Here, -rπ holds °"O゛° until the copy signal CP L changes to 'o'', so Q8-5 (Q7-
8) Once the CPL changes from "o" to "l", it is held at "1°°" until the CPL changes to "O".

Next, the operation of the paper feed solenoids 5L2A and 5L2B will be explained using FIG. 39.

When the paper feed control solenoid is energized, the cam rotates and the magnet approaches the Hall ICQH15, so PUTP becomes 1°O.
”, and Ql5-12 and Ql5-9 become °“l”.

At this time, if the upper cassette is selected, and if the lower cassette is selected, UC3 becomes "O" and the LC
It becomes 3″l″.

Next, we will discuss the operation of the first registration lens SLI in the fourth section.
This will be explained using FIG. 0, FIG. 41, and FIG. 42.

The first resist solenoid SLI operates twice in one copy.

This solenoid is used to align the leading edge of the image with the leading edge of the copy paper to some extent.

The first registration lens is energized by the rotation of the cam in the paper feed control section. After PUTP is "0", the magnet approaches the Hall ICQH14, and TTσF is "θ''
When it becomes.

L-3L Bi ON'' or when the image leading edge signal ■during optical advance reaches “°0°”, the paper feed signal (FU Ding) for the next copy will change to “
Until it becomes 0'', W becomes 1101+, which is momentary, but the output of C is returned to Q4-9 and QI O-2
holds the state of ``0'', and when field 2 changes from ``1'' to 0'', QIO-2 also changes from ``O11'' to ``1''.

When ON°°, the roller rotates and the paper is fed, but until the -th ON'', the paper forms a loop and "ON".
''' and then stops.

Then, when a signal indicating the leading edge of the image is output, the copy paper is fed again.

Next, the operation of the latching relay KC2 for the optical system advance signal will be explained using FIGS. 43 and 44.

KO2 is a latching relay and Q24-10 is “
When it reaches 0pa, it becomes “ON” (set) and mechanically turns “O”.
It cannot be turned "OFF" (reset) unless Q24-14 reaches "0°" while maintaining the "N" state.

In order for KO2 to be 'ON' (set), when the optical system is at the home position σCHP '0'), and when the drum comes to the home position during the initial rotation and leaves again (at the end of the initial rotation) η3 is , during the initial rotation, it is 0° from when DCKP becomes 1° until CPL becomes 0, so Ql is 4-11°.

From the above, by closing the KO2 contact, S CWT゛°1°
This signal is sent to the clutch and the optical system moves forward.

In order for KO2 to turn “OFF” (reset), ff
i'"o" power supply ° "ON" or "SCRV"1"
In other words, when the power is turned on, the KO2 must be reset by setting it to OFF for an instant.

Further, resetting during copying is performed when the optical system reaches the reversal position while moving forward.

Next, the optical system shift clutch CJljl, CM2゜CfL
The operation of No. 3 will be explained using FIG. 45 and FIG. 46.

The speed of the optical system changes depending on the reduction ratio, and the switching is done using the optical system speed signal (SSPDI, 5SPD2).
, 5SPD3).

1 of 3 clutches (C cross 1, C view 2, 0 sentence 3)
The combination of gears is changed by activating one.

In order to reduce the impact when the clutch is activated, the power to the clutch is initially reduced to about half, and when the optical system leaves the home position, the power to the clutch is reduced to 24V.

For example, if A3-6B4 is selected, 5SP
DI “°0°’, 5SPD2 “1”, 5SPD3 “0”
At this time, when the S CFWT becomes "B", the current will drop to RC24-VRC-DC+Q22-13.
At this time, the current flowing from the collector to the emitter of Q44 (the voltage across the clutch) is Q4.
Q43's base potential changes with VRC.

At this time, the VRC is set so that the voltage across the clutch is 16 VDC, thereby mitigating the impact when the clutch is activated.

When the optical system leaves its home position Therefore, 24VDC is applied directly to the clutch.

As can be seen from the timing chart in Figure 46, the clutch turns OFF when the temperature reaches 5CFWT"O"°.
"become.

5CFWT “O” This is because the Ov line is cut off.

Next, the operation of the developer drive solenoid SL4 will be explained in the 47th section.
This will be explained using figures.

The developing device operates only while the optical system is moving forward (including while the optical system is in the reverse position in the case of large size copying).

When the optical system is moving forward, the output mark is "O'", and when the optical system is in the inverted position of the large size, the DRMD mark is "O"), and the DLDV signal is JCB-10. The signal is then sent to the ATR circuit and lamp lighting circuit.

Next, the operation of the second range strike solenoid SL3 will be explained using FIGS. 48, 49, and 50.

The timing of the second resist is at the same magnification (2RGl) because the speed of the optical system differs depending on the reduction ratio.

Three types of signals are output by reduction I (2RG2), reduction II (2RG3), and Hall ICs (QH2, 3, 4), and a second registration signal corresponding to the reduction ratio is selected for each copy speed signal.

For example, if A3mB4 is selected, from the above, when the magnet approaches ANC (QH3), -7π℃7-゛0'' Ql 2-5 is already "l", so Nao, 2RG1
．． 2 RG 2 Ka” O” Ninattemo Q12-13
．． 10 is "O" 4: tt because Ql2-
8 does not change.

The second registration solenoid is a solenoid that ultimately aligns the leading edge of the copy paper with the leading edge of the image, and is normally energized from the image leading edge signal when the optical system moves forward until the second registration signal is output. The excitation is removed and the roller stops.

Note that the output signal of inverter A is also a count signal of a counter.

Next, the operation of the counter for counting the number of sheets will be explained using FIGS. 51 and 52.

There are three types of signals for operating the counter: one for small size, one for large size, and one for reduced copy.

■The small size count signal is used when a small size cassette is selected (SMCI "'
When the output of the inverter A becomes "O" at "1"), the signal is generated (πNT"O").

■The large-size count signal is activated when a cassette other than the small-size cassette is selected (SM
It occurs (LCNT°°0'') when the output of inverter A becomes "°0°" at CI'"θ'°).

However, in the case of reduced copying, the output of inverter A does not affect r moss.

■The count signal for reduced copying is 5 regardless of the cassette.
SPDI is temporarily "O" during reduction copying, and is generated when the output of inverter A becomes "0" at this time.

As can be seen from the circuit diagram of FIG. 52, all three types of count signals are added by the total counter and the key counter.

Note that even if the [coho] signal is output together with other signals, the counter will increment only one signal because the timing is the same.

Regarding the output of the optical system inversion signal 5CRV, Figures 53 and 5
This will be explained using FIG. 4 and FIG. 55.

The inversion position of the optical system can be set to small (small) depending on the size of the original.
There are three locations: A4 and below), middle (B4), and large (83), and the part surrounded by the dotted line in the above figure is the circuit that selects it.

If a half-size cassette is inserted while normal copy is selected for small-size copy, '
fiTIff “1” and F-H “1”, so when A4-B5 is selected in reduced copy, RE
D'"1", A4-=685 "l", so if a B4 size cassette is inserted when middle size copy is selected, m "1"
, Q215-3 "0"-cTo6 f-r Also, when reduced copy is selected and B4 moment A4R or B4-=>B5R is selected, RED "l",
■Large size is when the size is other than small size or middle size because it is ``ma shoulder R'' or n kowan ``o''.

The optical system reversal signal for one-time copying is medium size (B4)
In this case, even when the optical system reaches the small size inversion position, the SML is "0", so Q218-2 is "θ", and Q218-3 is "l" regardless of the signal in the fourth section.

When the optical system reaches the inversion position for the medium size, next, in the case of the large size (A3), Q218-6
0” and SML “0”, it is always “0pa”.

In other words, even if the optical system reaches the small size or middle size inversion position and W■ or m changes from "1" to θ", Q218-6 remains "0" and does not change, so the optical system It continues working until it reaches the size reversal position.

When the large size inversion position is reached, the large size inversion signal remains the same during reduction copying.

The optical system inversion signal at the time of reduction copying is the target τ at the time of reduction copying.
Since it is “o”, even if the signal of Q218-6 changes, the Q
207-3 is sent to Q225-1 with a delay of 0.1 seconds, with the signal "l" unchanged. The reason for this is described below.

For example, when reducing B4mB5R, the entire B4 size document is converted into a B5 size image 1al as shown in Figure 54.
If the size is reduced to 1 (excluding the non-image width of about 8 mm at the separating section), the trailing edge of the 85-size copy paper will be left over.

Even if a document larger than B4 size is to be copied, the optical system's inversion signal is delayed by 0.1 seconds in order to copy the image onto the above-mentioned surplus area.

Note that the delay of the large size inverted signal will be described later.

The small size or medium size optical system reversal signal for temporary reduction copy is sent to Q225-1 at the timing shown in the above figure.
A signal is sent to 5CRV, and 5CRV changes.

In other words, 0.1 seconds after the optical system reaches the inversion position, Q22
5-1 becomes "O" and 5CRV becomes "l".

In addition, in the case of large size, 'I? At the same time as fff becomes "0", it becomes 5CRV"l", but even if the document is larger than A3, the Hall IC should be placed in a position where the entire area within the range of the document table can be exposed.
QH7 is installed.

Next, the operation of the fixing device overshoot control circuit will be explained using FIG. 56, FIG. 57, FIG. 58, and FIG. 59.

The surface temperature of the upper roller of the fuser is normally 170'C! However, a thermoswitch (TS3) is provided to control the temperature at 190'' when the room temperature is 10°C or lower.

However, since the reaction of the thermistor (THI) is slightly delayed, when the thermistor detects 190°C, there is a possibility that the temperature of the fixing roller exceeds 200"O (overshoot), which may deteriorate the rubber of the fixing roller. There is a risk of

To prevent this, even if the room temperature is below 10°C, the temperature is controlled at 170"O for 40 seconds after the wait lamp is turned off.

However, as soon as the copy signal is output during the 40 seconds mentioned above, the control temperature is switched to 190°C.

Note that when the continuous copy button is pressed, the control temperature of the fixing roller is further increased by 5°C.

That is, when the room temperature is 10°C or lower, the heater is controlled at 195°C, and in normal cases it is controlled at 175°C.

In the unlikely event that an abnormal temperature rise (approximately 250°C) occurs, a thermoswitch (TS) is installed to cut off the heater circuit.
2) is provided at a position 1 mm away from the fixing unit troller.

If the copy button is pressed within 40 seconds after the wait lamp is turned off at a room temperature of 10°C or below, the copy signal CPL becomes l"' and the paper feed control solenoid signal PUC3 momentarily becomes "l".
CI" becomes "ON" and self-maintains. (If the copy button is not pressed, after 40 seconds) The temperature control of the fixing roller is based on the voltage of the input ■ of Q601, and changes according to the temperature change of the fixing roller Q60.
If the voltage of the input ■ of 1 (because the resistance value of TH1 changes depending on the temperature) is higher than ■, the output (b) of Q601 will be “
If it is lower than O°゛, ■, it becomes °゛l°', and Q601-
6 If “1”, the fusing heater is “OFF”, “
If it is 0°', it becomes "ON".

Further, during continuous copying, the copy paper absorbs heat when passing through the fixing device, so the contact of K-201 closes and becomes the reference voltage. The voltage of Q601-3 is lowered (because one resistor is shorted) and the heater control temperature is raised by 5°C.

Further, when the room temperature is 10° C. or lower, in order to prevent fixing failure, the two resistors (1) and (2) are short-circuited, the reference voltage is lowered, and the control temperature of the heater is raised by 20° C.

However, as mentioned above, after the wait lamp is turned off, the
Seconds (when not copying), since KC-1 is open, the two resistors are not shorted, that is, 17
The heater is controlled at 0°C.

(In this case, the wait time is extended by about 30 seconds.) Next, the jam detection circuit will be explained using FIGS. 60, 61, 62, and 63. First, the determination of whether paper is present or not will be explained using the circuit shown in FIG. 60.

When there is no paper, when there is paper, when the paper reaches the exit as described above, Q563■ outputs 20 (V) and at the same time, Q562 outputs 20 (V) to maintain the reference voltage of Q563■. Working C567, C566
prevent discharge of

If there is no paper (Q563 output 0 (V)) Q565
Since the base potential of Q565 falls, Q565 turns ON, and Q562 becomes =■, and there is no output from Q562.

Next, explanation will be given using the jam detection circuit shown in FIG. 61. The jam detection circuit detects two types of jams.

■If the copy paper gets stuck at the exit - 111 output jam ■If the copy paper does not reach the exit in a certain time - 111 jam inside the machine First, regarding the exit jam, the time chart in Figure 63 shows 3.0 after the copy paper reaches the exit.
If it does not pass within ±0.3 seconds and remains, SL7
is activated, and by switching the MS23, the paper feed check lamp is turned on and the copying operation is stopped at the same time.

When the paper reaches the exit, when the paper passes through, and the paper stays at the exit, 3,0 ± 0.
After 3 seconds, the operating voltage of Q27 is reached (jam detection).Next, regarding the jam inside the machine, as shown in the time chart in Figure 62, the voltage is 2.5±0 after the image leading edge signal (IRGP) is output while the optical system is moving forward. .If the copy paper does not reach the exit after 2 seconds, SL7 is activated.

When the power is turned on, the voltage is -0° for a moment, so reset one circuit.

PUR3 "Bi' → Q35 "OFF" (but bias on) Waits for jam detection set signal (image leading edge signal) with Q35 bias on.

While the optical system is moving forward, when it reaches the image leading edge position, the paper will jam inside the machine when it reaches the exit.
Seconds later (2.5±0.2 seconds after the signal is output from the leading edge of the image) the operating voltage of Q27 is reached [→SL7 “ON” (jam detection) When the jam solenoid (SL7) is activated, the micro switch MS23 is switched to NC, the ``Adjust paper feed'' lamp (PLD 11) lights up, and at the same time, a jam signal JAM ``l'' is generated.

In addition, because the other microswitch M326 also switches to NC, the fixing heater circuit is disconnected, and the heater (H
l) goes out.

These microswitches can be turned back on by pressing the reset button.

In addition, as soon as JAM “l”′ is reached, CPOK “o°′”
When the optical system reaches the reversal position, the CPL becomes "0" and the copying operation stops.However, the optical system returns to the home position due to the force of the reversal spring.The drum also returns to the home position and stops), and Since the fixing device jam clutch (Ci4) is turned "'OFF" by the JAM "l°" signal, the drive to the fixing device is cut off and the machine stops.

Next, the automatic toner replenishment circuit (hereinafter referred to as ATR circuit) will be explained with reference to FIGS. 64, 65, and 66.

The principle of ATR is that a hopper motor detects the amount of developer present in the gap of a coil attached to the detection part of the developing device as a change in magnetic permeability, and replenishes toner to the developing device. It is to control.

In FIG. 65, the impedance Z of the coil is expressed by equation (1).

Z=ωLF+ωLA(Ω) −−−−−−−−−−−−
−−−−−−−−−−−−−−−−(1) (ω: 2πf
, LF: iron core inductance.

LA: open inductance) Since ω and ωLF are constant in equation (1), the impedance changes depending on the open inductance.

Note that the inductance is expressed by equation (2).

L=True A (H)
−−−−−−−−−−−−−−−−−−−−(2)
River; p-0r (p: magnetic permeability, N: number of coil turns, A: coil cross-sectional area + J
2' coil length) 〃 In equation (2), all values other than 4 are constants. Further, 0 is also a constant.

In other words, the inductance changes depending on the relative magnetic permeability of the air gap.

Since the developer is composed of toner and iron powder, the relative magnetic permeability changes depending on the amount of developer in the gap, which changes the inductance and invitanity.

For example, the relative magnetic permeability of air and toner is approximately 1. Iron is 100~
2.000, so if we simply replace everything other than pr in equation (2) with constants, we can assume that there is only air in the gap when the amount of developer decreases, so the inductance is IK (
H) On the other hand, if there is a lot of developer, it is thought that there is iron in the gap, and the inductance is 100 to 2,000K.
(H).

Next, the actual operation of the ATR circuit will be explained using FIGS. 64 and 66.

When the amount of developer is appropriate and the amount of developer decreases, 80 BON is applied to L+ (However, only when DVDLD is "1") [-M4□ ↓ [=)1 Note that if there is a lot of toner in the hopper, Micro e-switch MS2 installed at the bottom of the motor
5 is actuated (NC) but when the toner is almost empty, it switches to No and m ” o
” and the “Please check replenishment developer ° lamp PLD12) lights up.

Next, the power supply regulator will be explained using FIG. 67, FIG. 68, FIG. 69, FIG. 70, and FIG. 71.

When the power supply voltage fluctuates, the illuminance of the original exposure lamp (halogen lamp) changes, which affects the image quality of copies.

To prevent this, the power supply regulator always maintains the supply voltage to the halogen lamp at an effective value of 80 VAC.

Operation when the power is turned on 1) ACto O (V) is applied to the transformer (T201), and the secondary side outputs too (V).

2) AV I OO (V) is rectified by D201. (Waveform shown in Figure 68 ■) 3) One of the voltages after the rectified wave is applied by ZD201 (
V) sliced to max.

(Waveform shown in Figure 68 (■)) 4) The other voltage is significantly dropped by R212 and charges C207 as a minute current.

5) Since the charging current of C207 is small, charging becomes slow as shown in FIG. 68 0.

6) When the charging voltage at point 0 falls and exceeds the gate potential, Q204 turns ON”L and the pulse transformer (Pr2
O3) is activated.

7) The triac (Q205) is turned on by step 6), but as shown in FIG. 68, the effective value is insufficient to light the halogen lamp.

8) For this reason, turn on the power to the halogen lamp.

It won't turn on just by doing that.

When the illumination system advances 1) Until the DVDLD reaches "l'', the above (a) 1)
~8) is the operating state jE.

2) Also, A C9,6(
V) is added to D202, rectified afterward, and smoothed by C205 to bias Q201.

However, since no voltage is applied to the collector of Q201 until DVLD reaches I'l'', this circuit is irrelevant.

4) The effective value at point D becomes 80 (V) and the lamp lights up. Note that the potential at point OO is as shown in FIG.

The operation when the power supply voltage fluctuates will be explained with reference to FIGS. 70 and 71.

When the power supply voltage fluctuates, the voltage supplied to the halogen lamp also fluctuates, making the illuminance of the lamp unstable. Therefore, the lamp lighting circuit operates so that the voltage supplied to the halogen lamp always has an effective value of 80 (V) by controlling the phase shift of the voltage at the 0 point.

If the voltage increases> 1) Voltage rise on the primary side of T202 2) Voltage rise on the secondary side of T202 3) Increase in base potential of Q201 4) Increase in collector current IC of Q201 5) Increased voltage drop at R207 6) Q203 base potential decreases (bias source) 7) Decrease in emitter current of Q203 8) Q207 charging time is delayed.

9) “’ON” of Q204 is displayed.

Since the increased effective amount is subjected to phase shift control, the subtracted effective value remains unchanged at 80 [V].

When the voltage goes up 1) The voltage on the primary side of T2O2 decreases.

2) The voltage on the secondary side of T2O2 decreases.

3) Bias F of Q201 is increased.

4) Decrease in collector current of Q201 5) Voltage drop area at R207 6) The base potential of Q203 -L increases.

7) Increase in emitter current of Q203 8) Q207 charging time becomes faster.

9) “ON” of Q204 becomes faster.

As mentioned above, the effective amount decrease due to maximum value decrease is Q20
4's "'ON" timing is quickly covered and the effective value is maintained at 80 [■].

Next, Fig. 72 shows the operation of the preset counter circuit.
This will be explained using FIG. 73, FIG. 74, FIG. 75, and FIG. 76.

The preset counter circuit electronically stores the number of copies specified by the copy tile during continuous copying, and stops the continuous copying operation at the specified number of copies. It also displays the number of copies in continuous copying.

As shown in FIG. 73, the designated number of copies is displayed by a print diode that indicates the number of copies set using the two copy dials (for the l digit and the tens digit) on the operation panel. .

The switch attached to the copy dial (Slo
t, 3102) also serves as an encoder.

In other words, when the switch is set to a decimal value of '4', a binary value of '0100' is output from the switch output.

To explain the operation when the continuous copy button is pressed, as shown in Fig. 74, when the continuous copy button is pressed,
The display of the seven segments is "0゛° for both the l digit and the tens digit.

At the same time, a copy command signal is issued, and the state becomes ready for copying.

Continuous copy button "Press → MS8'" ON The above operation generates a load signal and a clear signal, and the load signal changes the signal from the copy dial to Q105.
It is stored in memory and the copies can be counted. Also, the driver (QloB) is cleared by the clear signal.
It returns all the signals to "0" and waits for the count signal.

A count signal is generated when the optical system reaches the reversal position while the optical system is moving forward (SCFWT "l").

5CRV “1”)4. : Generated by operating lJ Ray (KIOI) (CNTP'"l゛°).

This count signal is 2 times by Q105 for each copy.
The base numbers are added and the corresponding decimal numbers are displayed in seven segments.

[→Q105-4”O’” This operation is repeated depending on the number of copies.

If you specify the number of copies of 10 or more.

After counting “9”, a finger-up signal comes out, and the l digit is 0.
°", the tens place displays 1"1 +1, and continues counting until the indicated number of sheets matches the display.

In the case of copy end r, signals 9 to 16 of Q105 and Q105c7) 5-8.1
When all signals from 7 to 20 match, L-Q103 “ON”
'1, and the copy command CCMD becomes OFF, so the copy operation ends.

The case of copy stop will be explained.

If you press the stop button during continuous copying, MS17
"'OFF" L-LOAD "O" and the copy command CCMD becomes "O", so the copy operation is completed and the Hanapun segment displays the number of set copy tiles.

A time chart of this operation is shown in FIG.

Next, the power supply circuit is shown in FIG.

The Kono circuit uses approximately 12vAC and approximately 30VAC (7) power supplies with D501 and D502, respectively, and C501, C5
02, C505, and C506 are inter-slip to 5VDC and 24V.
This is for supplying DC to each circuit.

Also, if the output voltage fluctuates for some reason, Q5
01, Q502. It is also possible to automatically correct the voltage to a constant voltage using Q503 or the like.

Next, sequence control in each reduction copying mode will be explained with reference to the above circuit and time chart 3.4.5.6.

First, the operation of the present copying apparatus in the first mode, in which the copying magnification is 1x, the copy paper is small size, the cassette is an upper cassette, and the single copy mode is set will be described according to the timing chart shown in FIG.

First, press the copy button for one copy, and the MS24 will be ``1''.
level and 5CBP also becomes “1”.

KC3 turns on and holds itself, and CCMD becomes "l°".

Before this copy, I had made a full size copy! -Then,
LPOK"1" t ter18M"1-WrrT" 1
”, PCIL”1”, PCEL”1” Nara CPOK
CPOK becomes “l” (Fig. 19 circuit), CPOK “1”
Then, CPL becomes ``l'' (Fig. 21), and CP
When L is turned on, 4 is turned on (the circuit shown in Figure 22), and when K4 is turned on, as shown in Figure 23, when M1 is turned on, the main motor rotates and the drum starts rotating, and the FMI
turns on and the optical cooling fan rotates, and FM3 turns on and the drum cooling fan rotates. Also, as shown in the circuit diagram of Fig. 26, pilot lamps PL15, 16, 17,
18.23 is turned on, the pre-exposure lamp and the sharp cut lamp are turned on, and SL6 is turned on, and the fixing device slide/id is excited. Also, as shown in Figure 36, 4 on 1. Then, PL7, 8, 21, 2F2 are turned on and the blank exposure lamp is lit. CPL is “
When the temperature reaches 1°, signal 3 is turned on as shown in Fig. 30, HVT1 is turned on as shown in Fig. 31, and AC charge removal, plus transfer corona discharge is performed. Also, CPL is “°1′
', as shown in FIG. 33, 2 is turned on, FLI is turned on, and the entire surface exposure lamp is lit. Further, as shown in FIG. 22, when the CPL is "1", the voltage 5 is turned on, and as shown in FIG. 29, the HVT 2 is turned on and weak AC charging is performed.

The magnet in the second drum car of the rotating drum is close to the *-rule I CQ H3, and the current DcKP becomes 0''.Therefore, according to the circuit shown in FIG. 29, η becomes 0'', and the
As shown in the figure, HVT2 is turned on to perform strong AC charging for image formation, SLO is also turned on, the paper feed control solenoid is excited, the cam rotates, and the magnet approaches the Hall ICQ) 115, so PUTP becomes "0°". (Figure 39).Also, since the upper cassette is selected, the UO
3"1'', 5L2A is turned on, and the -1 first stage paper feed roller is lowered.

Next, the magnet approaches the hole I CQ) (14 in Figure 2-44.
As shown in , W becomes "0'', SLl is turned on, the first conveyance roller and the second conveyance roller rotate, and one sheet of paper is picked up. This is the first operation of the first lugist solenoid. Next, During the second rotation of the drum, the magnet is inserted into the hole I CQ) (l
2, as shown in Figure 2-47, when the second prayer is °°l' and the drunkenness is "1'°, Kc2 is turned on (Fig. 22), ■ the back is "O", D VL
The ATR circuit becomes operational, O, 1, and L are turned on, the original exposure lamp lights up, and SL4 is activated.
is turned on and the development drive solenoid is activated (Fig. 47).

On the other hand, 5CFW has "1" Te, and 5CFWT has S
CFWJ: After a delay of 0.1 seconds, the signal becomes "l", C signal 1 is turned on, the forward clutch is energized (Fig. 45), and PL7, 8, 21, and 22 are turned off (Fig. 36). In other words, the developing device operates, the document exposure lamp lights up, and the optical system moves forward.

Furthermore, the magnet of mirror l is close to Hall ICQH2 (Fig. 49).

In other words, the timing roller starts rotating in response to the second registration signal, and the paper is fed.

At this point, the leading edge of the copy paper and the leading edge of the image match.

Next, when the magnet of mirror 2 approaches Hall E CQH5, W
becomes "0°" (Fig. 53), and 5CRV becomes "B" (Fig. 43).

As a result, Kc2 was turned off and Tori was "1".

(Fig. 17), DVDLD becomes "0", the ATR circuit is activated, O, 1, and L are turned off, the document exposure lamp is turned off, the development drive solenoid is turned off (Fig. 47), and HVT2 is turned off. It turns on and becomes weakly AC charged (Figure 29).
The blank exposure lamps PL7, 8, 21, and 22 are turned on (FIG. 36), and the forward clutch CJJI is turned off, causing the optical system to move backward (FIG. 45). In addition, KO2 is also turned off (Fig. 17), which causes CCMD to become “o” (Fig. 17).
(Figure 6) CPL also becomes 0 (Figure 21), and the copy signal is cut off, so the copy operation ends.

Approximately 1 second after CPL reaches “°0°°, relay 3 turns off and the power to HVT 1 is cut off.

In other words, the front AC, plus, and transfer charging are turned off (Fig. 31).

Also, the drum home position "I]y"o" after approximately 2.8 seconds or more has passed since the CPL became "0゛'.
And the re-drum with DRMD “O” is
It stops at the third rotation. In other words, when the DRMD reaches "O°", as shown in Figures 22.23.26 and 29.36, 4 is turned off, the main motor Ml is turned off and stopped, the fuser drive solenoid SL6 is turned off or released, and the optical fan FMI is turned off.
stops, cooling fan FM3 stops, and PL15, 16
,17゜18.23 is turned off, pre-exposure, sharp cut lamp is turned off, K5 is turned off, HVT2 is turned on, weak AC charging is stopped, PL7, 8, 21.22 is turned off, blank exposure lamp is turned off. do. Furthermore, about 1 second after the drum stops, relay 2 is turned off and the full surface exposure lamp FLl is turned off.

Next, as the second mode, the copy magnification is 1x, and the copy paper is A3
, B4 large size, and a mode in which two copies are made in the upper row of the cassette will be explained according to the timing chart of FIG.

First, press the continuous copy button.

If a same-size copy was made before starting this copy operation, LPOK""1", JAM"1", WAIT"1", PCIL"l"
, if PCE is 'l' then CPOK '1' HVT2 ON; The drum becomes charged with a weak AC and starts rotating, and when the magnet of drum gear 1- approaches Hall ICQHI3, the paper feed control solenoid is energized and the cam rotates. , the magnet is a Hall IC
Since it is close to QHI5, the upper stage cassette is selected, so the upper stage paper feed roller is lowered.

Next, the magnet approaches the Hall ICQHI4, the first conveyance roller and the second conveyance roller rotate, and the paper is caught. This is the first operation of the first robot.

During the second rotation of the drum, the magnet approaches the Hall ICQHI2, and when it separates from it, the developing device is activated, the document exposure lamp is lit, and the optical system moves forward.

When the paper approaches the magnet hole ICQHI of the mirror 1, the first and second conveying rollers rotate again to feed the paper, and the timing roller stops.

The paper makes a loop there.

Furthermore, the magnet approaches the Hall ICQH2, and the timing roller starts rotating in response to the second registration signal, and the paper is fed. Here, the leading edge of the copy paper and the leading edge of the image match.

When the magnet of the mirror 2 comes close to the Hall ICQH 7, the optical system is reversed by the force of the spring.

Also, 1 GB becomes "1", the document exposure lamp goes out, and the developer stops operating.

When the optical system is moving backward, the magnet approaches the wheel ICQH9, the paper feed control solenoid is energized, and the cam rotates.
Since the magnet is close to the Hall ICQHI5, the PUTP "0" or 1; stage cassette is selected, so the L stage paper feed roller is lowered and two sheets IJ are fed.

Next, the magnet approaches the Hall ICQHI4, and the first conveyance roller, second w, and feed roller rotate, and one sheet is picked up.

When the magnet approaches the Hall ICQHI2 and moves away from it during the fourth rotation of the drum, the developing device is activated, the document exposure lamp is turned on, and the optical system moves forward IW again.

When magnet 1 of mirror 1 approaches Hall ICQHI again, the first and second conveying rollers rotate again to feed the paper, and the timing roller stops, so that the paper goes through a loop there.

Furthermore, the magnet approaches the Hall ICQH2, and the timing roller starts rotating in response to the second registration signal, and the paper is fed. Here, the leading edge of the copy paper and the leading edge of the image match.

When the optical system reaches the second reversal position, the change changes from "Gl""1" to "0°", and the optical system moves backward, and the copying operation ends because the copy signal is cut off.

m■゛0pa becomes "1", the original exposure lamp goes out, and the operation of the developing device also stops.

Approximately 1 second after CPL becomes “θ”, 3”O is applied to the relay.
FF" and the power to the HVT 1 is cut off. In other words, the front AC, plus, and transfer charging are turned off.

Also, D RMD at the drum home position "o" after approximately 2.8 seconds or more has elapsed from CPL "0".
“The drum becomes OP and stops at the 6th rotation.

DRMD “0” OFF; Blank exposure lamp turns off. Furthermore, about 1 second after the drum stops, 2 turns on to the relay.
The full exposure lamp FLI, which becomes FF, goes out.

Next, the operation of copying one sheet at a time when the copying magnification is reduced (B4→A4R) and the cassette is in the upper stage will be explained below using the timing chart shown in FIG.

The reduced size selection button is pressed from B4 to A4, and A is displayed on the top row.
It is assumed that an AR size cassette is inserted.

Press the single copy button.

Before entering into this copy operation, if you make a same-size copy, the lens position is LPI, and LP2 from B4 to A4.
It is different from.

As a result, the lens drive motor is activated.

When the lens reaches the LP2 position, the lens drive motor stops and the lens brake is applied.

At this time, 9 points "1", WAIT "1", crawl] T "1", P
If CEL "1"7-', HVT2 is ON, weak AC charging starts, and the drum starts rotating. When the magnet on the drum gear approaches Hall ICQHI3, the paper feed control solenoid is energized, the cam rotates, and the magnet starts rotating. Hall ICQH
Since it is close to I5, PUTP' is "0" Also, since the two-stage cassette is selected, the upper stage paper feed roller is lowered.

Next, the magnet approaches the Hall ICQHI4, the first conveyance roller and the second conveyance roller rotate, and the paper is caught. This is the first operation of the first urgist solenoid.

During the second rotation of the drum, the magnet approaches Hall ICQHI2, and when it moves away, it turns off, becomes part of a blank exposure lamp, activates the developing device, lights up the document exposure lamp, and moves the optical system forward.

When the magnet approaches the Hall ICQHI, the state becomes "0" and the 1st-i2 transport roller rotates again to feed the paper, and the timing roller stops, so that the paper forms a loop there.

Further, as the magnet approaches the Hall ICQH3, the timing roller starts rotating in response to the second registration signal and the paper is fed. Here, the leading edge of the copy paper and the leading edge of the image match.

When the magnet of mirror 2 approaches Hall ICQH6, ■Nail J
"L"→"O", the optical system is reversed by the panel, and the copy signal is cut off, so the copy operation is completed.

3”OF to about 1 sand diameter relay after CPL becomes “0”°
F" and the power to HVTI' is cut off.

In other words, the front AC, plus, and transfer charging are turned off.

Also, after 2.8 seconds or more have elapsed from CPL “Oo”, the DRMD is “0” at the drum home position ■ding “o”.
”The tram will stop at the fourth rotation.

7'/ DRMD "O" OFF, blank exposure lamp goes off, and about 1 second after the drum stops, 2 turns to O on the relay.
It becomes FF and the full exposure lamp FLI goes out.

Next, when the copying magnification is 1/2 and the size is reduced from A3 to A4, the cassette is paired in one stage and the operation of copying two sheets at one time is fjS.
This will be explained using the timing chart shown in FIG.

It is assumed that the reduction size selection button A3->A4R is pressed and an AdR size cassette is inserted in the upper row. Press the continuous copy button.

If you had made a full size copy before starting this copy operation, the lens position would be LPI, A3→A4A.
This is different from LP3.

Then, the lens brake is released, the lens drive motor is operated, and when the position LP3 is reached, the lens drive motor is stopped and the lens brake is applied.

At this time, 9 countries゛1'', WA I T“1'', crawl]
T°“l°′.

π■ If “1”, HVT2 is ON; the drum becomes weak AC charged, the drum starts rotating, and when the magnet on the drum gear approaches the Hall ICQH13, “P'U Ding Ding” 0 Pamata” two-stage cassette is selected. Therefore, UO3 is "l", and the paper feed roller is lowered by one stage.

Next, the magnet approaches the Hall ICQH14, the first conveyance roller and the second conveyance roller rotate, and one sheet of paper is passed between them. This is the first operation of the first urgist solenoid.

During the second rotation of the drum, the magnet approaches the Hall ICQH12, and when it separates from it, the developing device is activated, the document exposure lamp is lit, and the optical system moves forward.

When the magnet comes close to the Hall ICQHl, the first and second transport rollers rotate again to feed the paper, and the timing roller stops, so that the paper forms a loop there.

Furthermore, the magnet comes close to the Hall ICQH4, and the timing roller starts rotating in response to the second registration signal, and the paper is fed. Here, the leading edge of the copy paper and the leading edge of the image match.

When the magnet of mirror 2 comes close to Hall ICQH7L, Therefore, the optical system is reversed by the force of the spring.

Also, the document exposure lamp turns off and the developer stops operating.

When the optical system is moving backward, the magnet approaches Hall ICQH9j, the paper feed control solenoid is energized, the camshaft rotates, and the magnet approaches Hall ICQHI5, resulting in the row π° "0".

Also, since the "-" stage cassette is selected, the upper stage paper feed roller lowers and feeds the second sheet.

Next, the magnet approaches Hall ICQHI44 and Tπ7c "
O'' [→SLI ON], the 14th fG feed roller and the second feed roller rotate, and one sheet is picked up.

During the 4th rotation of the tram [1], the belt surface approaches the pole ICQHI2, and when it moves away, the developer operates, the document exposure lamp lights up, and the optical system moves forward again.

When the magnet of the mirror 1 approaches the Hall ICQHI, the first and second transport rollers rotate again to feed the paper, and the timing roller stops, so that the paper forms a loop there.

Furthermore, the magnet comes close to the Hall ICQH4, and the timing roller starts rotating in response to the second registration signal, and the paper is fed. Here, the leading edge of the copy paper and the leading edge of the image match.

When the optical system reaches the second reversal position, L, CPL, . . . 0, the optical system returns, and the copying operation ends because the copy reliability is cut off.

As a result, the original fog light lamp goes out and the operation of the developing device is also stopped.

After CPL '0', 3'O to about 1 sand diameter relay
FF” and the power to HVT 1 is cut off. In other words, the front AC.

Plus, transfer charging is turned off.

Also, after approximately 2.8 seconds or more have elapsed from CPL'"Ooo, the drum home position "o" is set to D.
RMD゛O°'' and the drum stops at the 6th rotation.

Blank exposure Rankaro'
is turned off, and the entire surface exposure lamp FLI is turned off.

FIG. 79 shows an internal circuit diagram of the DC controller 2, and FIG. 80 shows an internal circuit diagram of the DC controller 2.

Also, Fig. 81 is a load drive circuit diagram, and fjS81 Fig. (a)
81(b) is a drive circuit diagram of the drum heater H3 and fixing heater H1, and FIG. 81(b) is the main motor Ml.

Optical cooling fan FMI, Dora 11 cooling fan FM3.

Full-face exposure lamp FLI, original exposure lamp EPL.

Compatible heat fan FM2, lens drive motor M5. Hopper motor M4. and a drive circuit diagram for driving the high voltage transformer HVTI.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a copying apparatus according to the present invention. FIG. 2 is a perspective view of the operation panel of the copying machine. Figure 3 is a timing chart for full size, small size, and single copy. Figure 4 is a timing chart for full-size, large-size, and two-sheet copying. Figure 5 is a timing chart for B4→A4R reduction Φ middle size and one-sheet copying. Figure 6 is a timing chart for copying 2 sheets from A3 to A4R reduction/large size. Figure 7 is a schematic diagram of the cassette stand. Figure 8 is the cassette type detection circuit diagram. Figure 9 shows latch ICQ209 and Q210. Circuit diagram of Q211. Figure 10 is a reduction ratio selection circuit diagram. Figure 11 is a connection circuit diagram to Figure 10. Figure 12 is a cassette size display circuit diagram. Figure 13 shows Hammer Driver Q227. Q22B,
Q22. Q23. Q24. Schematic diagram. Figure 14 is a cassette check/cassette replacement lamp display circuit diagram. Figure 15 is a circuit diagram for detecting paper in the cassette. FIG. 16 is a circuit diagram for generating copy command signal CCMD. FIG. 17 is a circuit diagram for holding the copy command signal CCMD. Figure 18 is a lens drive circuit diagram. Figure i19 is a copy enable signal CPOK generation circuit diagram. FIG. 20 is a copy signal-JfCPL generation circuit diagram. Figure 21 is a timing chart of CPL occurrence. FIG. 22 is a main motor drive signal DRMD generation circuit diagram. Figure 23 is the main motor/optical fan/cooling fan drive circuit diagram. Figure 24 is a timing chart of each part in Figure 22 when the drum is not at the home position. Figure 25 shows that the copy signal CPL changes from “1” to “°0’.
23 is a timing chart of each part in FIG. 22 when the change is made to '. Figure 26 is a circuit diagram for driving the pre-exposure lamp, sharp cut lamp, and fuser drive solenoid. Figure 27 shows the layout of the corona discharger. Figure 28 is a high voltage transformer HVT drive timing chart. Fig. 29 is a high voltage transformer I (VT2 drive circuit diagram). Fig. 30 is a high voltage transformer HVTl drive signal generation circuit diagram. Fig. 31 is an HVTl drive circuit diagram. Fig. 32 is a timing chart of each part in Fig. 30. Fig. 33 The figure shows the full-surface exposure lamp lighting signal 0EXP generation circuit diagram. Figure 34 shows the full-surface exposure lamp FLI lighting circuit diagram. Figure 35 shows the timing chart of each part of Figures 33 and 34. Figure 36 shows the blank exposure lamp lighting circuit. Fig. 37 is a drive circuit diagram of paper feed control solenoid SLO. Fig. 38 is a timing chart of each part in Fig. 38. Fig. 39 is a drive circuit diagram of paper feed solenoids 5L2A and 2B. Fig. 40 is a drive circuit diagram of the paper feed control solenoid SLO. Drive circuit diagram of solenoid SLI. Figure 41 shows the timing chart of each part in Figure 42
The figure shows the SLI operation timing diagram. Figure 43 is a circuit diagram of the optical system forward signal generation circuit. Fig. 44 is a timing chart of each part in Fig. 44. Figure 45 is a clutch selection circuit diagram for optical system shifting. Fig. 46 is a timing chart of the part numbered in Fig. 46. FIG. 47 is a developing unit drive solenoid drive circuit diagram. FIG. 48 is a second resist signal 2RGP generation circuit diagram. FIG. 49 is a second registration solenoid drive circuit diagram. FIG. 50 is a timing chart of each part in FIG. FIG. 51 is a circuit diagram for generating a counter operation signal. Figure 52 is a counter circuit diagram. Figure 53 is a diagram of the optical system inversion signal generation circuit. Figure 54 shows B4. B5 size manuscript drawing. FIG. 55 is a timing chart of each part of FIG. 54. Figure 56 is a diagram showing the relationship between time and fixing roller temperature. Figure 57 is an overshoot circuit diagram. Figure 58 is the timing chart of Figure 57. Figure 59 is an overshoot circuit diagram. Hina Extreme Heat 4 Schematic diagram. G7+AS power supply regulator circuit diagram. The second diagram is the voltage waveform diagram at each point in Figure 68 when the power is turned off. Figure 69 is a diagram of the voltage waveform at each point X in Figure 68 when the lighting system moves forward. '4-ryor Figure 6D A diagram showing changes in each part of Figure 68 when the power supply voltage fluctuates. FIG. 71 is a voltage waveform diagram at point D in FIG. 68 when the power supply voltage fluctuates. Figure 72 is a preset counter circuit diagram. Figure 73 is a diagram showing the designated number of sheets. Figure 74 shows the display when the continuous copy button is pressed. Figure 75 is a display diagram of the count signal. Figure 76 is a timing chart of the count signal. Figure 77 is a constant voltage power supply circuit diagram. Figure 78 is the overall control system circuit diagram. Figure 79 is a circuit diagram of DC controller l. FIG. 80 is a circuit diagram of the DC controller 2. FIGS. 81(a) and 81(b) are load drive circuit diagrams, and the second
In the figure, reference numeral 51 indicates a reduction mode input key 152 a cassette presence/absence indicator, and 53.54 a power set stage designation key. Applicant: Canon Co., Ltd. No. 73 Focused Human Power No. 2 δ Fig. 27 Fig. 3B Fig. 36, 7j'7-eJ υC5 Section 4I Fe Bi　IF:?cFP　Da'PuTF''/''
5muI ρN ρN DbeP HP +74v ssPl'l s:hPl)Z ;W'Z)3rd, 54
Figure [β4 Size 3 No. 55 (2) Volume 5 Otsu Ward Figure 57 Figure 5q Figure 65 Raku Figure 66 - 5 Clause' [81K ZVA/< Vtr No. 7B Figure 1 Ep Raku 75 Otsu Ward Procedure Amendment Akishiki) 1. Display of the case 1982 Patent Application No. 249061 2, Name of the invention Copying device 3, Person making the amendment Relationship to the case Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (+00
)Representative of Canon Co., Ltd. Ryu Kaku 3, Department 4, Agent address: 14Ei, 3-30-2 Shimomaruko, Ota-ku, Tokyo, Xenon Co., Ltd. (Tel: 758-2111) 5, Date of amendment order (shipment date): 1985 April 30, 2016 6. Description and drawings to be amended 7. Contents of amendment Figures 3 to 81 of the description and drawings originally attached to the application
As shown in the engraving of the figures and the attached sheet (no changes in content), however, Figure 78 (A), Figure 78 (B), Figure 79 (B)
), Fig. 80(A), and Fig. 80(B), see Part 1. I divided it into two parts.

Claims (1)

[Claims] In a copying apparatus having a plurality of copying magnifications, a photoreceptor on which an image is formed, a projection means for projecting image light onto the photoreceptor, and a projection position of the projection means on the photoreceptor during operation of the projection means. 1. A copying apparatus comprising: an irradiation means for irradiating an object; and a control means for changing and controlling an irradiation area of the irradiation means in accordance with the magnification.