JPS58179868A - Image forming device - Google Patents

Abstract

PURPOSE:To count the number of copying sheets with the simple constitution which does not require counting of discharge output, by holding the count number of sheets of a counter when a jam is detected and inhibiting the count operation in the stage of resuming the copying. CONSTITUTION:An input gate is closed by a jam detection signal and the copying number of sheets of a counter is held. When the revolution start signal FRSTRT for an insulaton drum by resuming the copying is applied, inhibit signals 1NH1, 1NH2 which continue for a prescribed time are generated with a delay circuit formed of FFs 181, 182, getes 183, 184, etc. The counting with the counter is prohibited until the copying is resumed by these signals 1NH1, 1NH2 and the jammed paper is discharged. The number of copying sheets is thus counted exactly with the simple constitution that does not require any counter for discharge output, etc.

Description

[Detailed description of the invention] The present invention relates to an image forming apparatus capable of compensating the number of sheets.

Conventionally, in order to accurately count the number of copies after a jam, it is known that a means for counting the actually ejected paper is provided separately from the copy counter, and the counted number is set in the counter to restart the counting operation. However, an ejection counter is required.

The present invention eliminates these disadvantages.

Examples will be described below with reference to the drawings.

FIG. 1 is a sectional view of the copying apparatus of the present invention.

The mechanical configuration will be described below.

The three-layered screen photoreceptor (Fig. 16) has ring-shaped ends, which are connected by a connecting band and stretched with adhesive or the like to an integrated metal screen drum base.
It is installed on a tubular screen drum shaft 2. Further, in consideration of the application of bias voltage, screen drum 7 lunges made of an insulating material are each fixed with screws at both ends of the screen drum 1. It has an opening so that the screen drum 1t) 13 can be installed inside the screen drum 1. The screen drum 7 langes are installed on a fixed tubular screen drum shaft 2 via ball bearings. The screen drum 1 is rotatable around a fixed screen drum shaft 2.

The screen photoreceptor of the screen drum 1 is constructed by laminating a photoconductive member 71 and an insulating member 72 on a member 70 on a conductor 1 having a large number of fine holes so that one part of the conductive member 1i protrudes. . It is made by threading thin metal wires made of stainless steel, nickel, etc. from the above-mentioned conductive materials company into a net shape. The mesh value of the conductive member is 100 to 100 from the viewpoint of dissolving power for copying.
The one that can secure 400 mesh and an aperture ratio of 50% or more is Takashima. Vapor deposition of photoconductive member 1j8e alloy, etc., cas
, Pho, etc., by coating with a dispersion of insulating resin and etching. The insulating member is made of an organic insulating material such as epoxy am, acrylic resin, silicone resin, etc. by glazing or vacuum deposition. In addition, it is possible to create a conductive member so that it is exposed on one side by applying a coating or spraying on one side of the conductive member and grinding the coated member.

The following devices necessary for forming an electrostatic latent image on the screen photoreceptor are arranged on the screen drum 10.

A pre-irradiation rung 3 is provided to erase undesirable ghosts on the screen photoreceptor, and a primary charger 4 applies a uniform electrostatic charge to the screen photoreceptor. Since the diameter of the screen drum is relatively small, the front end of the screen photoreceptor may be charged again even though the electrostatic potential has already been formed. Therefore 1
The secondary charger 4 is divided into two parts, and the same voltage and current are applied to each part with a time gap. The AC static eliminator 6 is provided to remove charges on the photoreceptor according to the optical image 5 of the original irradiated by the original irradiation lamp 52.

Further, instead of the AC static eliminator, a DC static eliminator having a polarity opposite to that of the primary charger may be used. Full-surface exposure run 77 is used to increase the contrast of the primary latent image on the screen photoreceptor. In addition, an insulating drum 8 having a conductive member coated with an insulating layer in the form of a thin film is placed adjacent to the screen drum 1 with a small distance therebetween. The screen drum 1 rotates in the direction of the arrow M, and the insulating drum 8 rotates in the direction of the arrow B.

Inside the screen drum 1, a modulation charger 11 is mounted on a rail 10 coated on an insulating block 9 at a position facing the screen drum 1 and closest to the drum 8, and a modulation charger 11 coated on an ultrafine block 9. Pre-modulation charger I on rail 12
S is attached to each. Also, Mr. I, who does not have dust attached to the screen drum 1 and is having trouble forming the primary latent image and the secondary latent image.
Floating dust is made to adhere to the back plate 16 of the discharger by the air blower 14° and the dischargers 15 and K on the way, and clear air is blown onto the screen drum 1 from the dust removal nozzle 17. In addition, if the screen photoreceptor is susceptible to low or high temperatures, the air being blown may be heated by the heat flJ18. When obtaining a large number of secondary latent images, the modulation charger 11 is used to apply a voltage of opposite polarity to ensure that the potential of the primary latent image remains constant throughout.

The secondary latent image on the insulating drum 8 is developed by a developing device j20. Including 20 developing devices and 22 toner replenishing devices,
It is separated from the developing section 24 by a partition plate 25, and the developing toner 25 is sent into the developing device 20 by the rotation of a toner distribution roller 260.

The developing toner 25 is sufficiently stirred by the rotation of the stirring roller 27, and the developing toner 25 is sufficiently stirred by the rotation of the stirring roller 27.
The electrostatic latent image on the insulating drum 8 is developed.

Paper feed tray 30-sheet copy paper in large quantities (2000-4000 sheets) K
The uppermost position of the photographic paper is detected so that the uppermost position 31 of the photographic paper is always at a constant position, and the uppermost position of the photographic paper is detected and raised along the guide rail 52 by the drive of the lift motor by the amount of the reduction.

A pick-up p-ler 35 picks up the paper from the top of the paper so that it almost matches the markings on the insulating drum 8, and the timing roller 34 picks up the markings on the insulating drum B. It is conveyed so as to match the image, passes through the conveyance roller 55, and is transferred by the transfer charger 36.
The eight images on the insulated drum 8 are transferred to copy paper. Furthermore,
Separation charger 57Fi increases the suction force between the insulated drum 58 and the copy paper, and separates and conveys the copy paper from the insulated drum 8 by the conveyor belt 58 incorporating the suction device 39. The conveyor belt 58 includes belt drive rollers 40 and rollers 41 and 42.
The conveyor belt 45.44 K rotates as the roller rotates, conveys the copy paper while sucking it, and sends the stretched copy paper to the fixing roller 45.

Then, the powder image of the copy paper is melted and fixed, and the copy paper safety guide 46
It can be received on a tray 47 along the

(Explanation of operation specifications of the key operation panel) Operation panel 6 of FIG.
Represented by instructions from 1. Hirusaku f#61 is composed of two indicators 62, 65.2 pilot lamps 65, 66, and a keyboard 64.

The key on the keyboard 64 is “OI (0RIG Engineering MAL)”
) is used when setting the number of electrostatic fIi images to be formed on the screen drum 1. Following this key, press "0".
” to “9” are pressed, the contents of the presses will be entered in the display 62. Further, if the 1 key is pressed after the numeric key is entered, the contents of the display 62 are cleared and the pilot lamp 65 of the Oka is turned on.

Conversely, if you enter the numeric key after the Oka pilot lamp lights up, the pilot rung goes out and the display @62
The 'PI value is entered.

In other words, numerical data and Oka commands are automatically switched.

In addition, the operation of Oka and Sha is described in [8'3'OPJ command (described later)
It is to be allowed to do this indefinitely until it comes.

Next + -1'RJ (RITINTzON) dx
lp li-y Used when setting the number of copies that can be repeatedly obtained by one electrostatic latent formed on the upper side,
Entries for the numeric keys or Oka keys are similar to those for the "O" key, and their contents are displayed on the display 65 or pilot 2.
displayed on the lamp 66. For example, <j2D on the display 62,
Display 65 The key operation when entering K<456> is E'0" → "1" → "-2" → "5" → 閤 → "4
” → “5” → “6”. Therefore "0" to "9"
The previous numeric keys and Oka key are changed to two function keys rOJ, r)tJ, and the two displays 62, 6 are displayed.
5, or you can optionally enter the pilot lamp 65.66. IQ theory, specifying the open key or the dark key, it doesn't matter which comes first.

Next, the "co" (IAI+ from CL AROR ENG) key is used to clear the display 62 and pilot lamp 65, and to correct incorrectly entered numerical data. Therefore, the display 62 (125
) and corrected the elephant as (454) L * AIMira rcOJ-+rOJ-44J-+r5J
→ All you have to do is press the key on the fat of r6J, l'-CRJ (
CLKARR1! TIeNTION) *- also exists for the same purpose and clears the indicator 65 or the lamp 66.

[BTkRT J key is used to start the copying operation, but if the contents displayed on the display 62.65 and) pilot lamp 65.66 are in an unreasonable combination, I don't work. The unreasonable combination is when the content of the display 62 is (000>) and when both the pilot lamps 65 and 66 are lit. ?P!
The reason for the latter is that it is impossible to copy without forming an image, and it is impossible to perform an infinite number of retentions each time an electrostatic latent image is formed. .

Furthermore, once the ITem RTJ key is activated and the copying machine starts to operate, it will not operate due to a prohibition circuit (described later) from Key Co., Ltd. other than [8 TOPJ].

Also, display 962 K<002>, 6spc<pOs>y
In the case of x entry, after the primary latent image is formed on the screen drum, modulation, development, and transfer are repeated three times in succession, and by repeating this cycle again, six copies are obtained. At this time, along with the operation of the ARTJ key,
The two indicators display <00 and the copying operation is in progress.
As a result, (001) (OO2), etc. are displayed.

(Description of operation panel circuit configuration) FIG. 2 is a block diagram of the operation panel circuit according to the present invention. A memory 202 and a counter 201 correspond to the display 62, and are used to store and count the number of electrostatic S images formed on the screen drum. memory 205,
A counter 204 corresponds to the display 63, and is used to store and count the number of copies to be made in one medical printing.

Screen drum counters and insulated drum counters manufactured by these counters 201 and 204, which will be described later, can be used.

To explain the circuit operation, it refers to a group of keys on the operation panel of companies 217 to 221, and the signals of these switches are gated by the output signal 214 of the inhibit circuit 216, and this signal @ 214
is normally at @1" level, but when the inhibit circuit 216 is activated, it becomes @O" level, and no output is generated even if the key group is operated.
. The inhibit circuit 216 is a flap flop 20? , 21
0,211 and two 00R games) 222,225 K consists of the above flip and 7p Tsuguhiro, each of which pressed the "STEMRTE" key.

``It remembers that the 8 TOPJ key was pressed, that a paper jam was fed by 1 sheet of paper, or that a paper jam occurred due to poor paper separation.Both flip-flops 209 and 210 were never set, but only one of them was set. Then, the other one will be reset.The 8TART command and the 5TOP command will never work at the same time.In addition, if the flip 70 knob 211 is set, the 7 lip 70 knob 209, 210 will definitely be reset, and the JA
ML, suspends all operations upon death. OR game)
The outputs of 222 and 223 are normally L″1″ and lO″, respectively.
At the level, flip-flops 209, 210,
When any one of 211 is set, these L′″0
”, inverted to “1” level, i.e. % jeTARTJ
When any one of the key, 8TOPj key, or JAM detection is in operation, the inhibit circuit 216 is activated, and the signal line 214 becomes @0m and the signal line 215 becomes @1. Therefore, the keys 217, 218, 220, 221 on the operation panel are disabled, and at the same time, the keys 225, 226 are closed, and the keys 225, 226 are closed.
24 and 227 open and the display 62 and display @6SK are replaced with the contents of memory 202 and memory 203.
201, the contents of the counter 204 are displayed. Then, during the copying operation, [8 keys except TOPJ key are not working].

Therefore, the message ``The moment the 8TARTJ key is activated, the counter is zero, so the display 62 tl<ooon→<oo
o>, 65 becomes <a a 5>→<000-. However, as the copying operation progresses, this number #j is counted up, and when the corresponding memory value and the counter value become equal, the copying operation ends. When the photographing is completed, each counter is cleared to zero in preparation for the next operation, and the displays 62 and 65 display the numerical values in the memory again.

[8 When the TOPJ key is pressed at any point during the copying operation, the operation ends at a well-defined point in the process from that point.

Next, %7 Rikupu Frog 205.20+6 remembers that the ``key% tsu'' key was pressed.

Neither of these will sect, and if one sets, the other will always reset. If the "9" key is now pressed, the flap frog 205 will be set and the gates 228 and 229 will move. IRV'h, numeric key group 21
When any of the 7 keys is pressed, the value is entered into the memory 202 through the gate 22@. At this time, if the pilot lamp 234 is lit by the flap flop 207 which remembers that the OK key has been pressed, it is reset by the signal 232 and the lamp is turned off.

Also, when the Oka key 221 is pressed at the position of the numerical key group 217, it passes through the gate 229, sets the flip-prop 207, lights up the pilot lamp 2M, and at the same time, some numerical value has already been stored in the memory 202. If it is,
Clear this with signal line 235. Therefore, the entry of a numerical value into memory and the Oka instruction cannot be satisfied at the same time; one is true, and the other is always not true.

Furthermore, when the rRJ key is pressed, Flip Frog 2
05 is reset, flipflop 206 is set, and gates 230 and 251 are opened. Hereinafter, as in the case of the above-mentioned ``4'' key, the number g4 of the key group 217 - Mori Gate 2
51 to the memory 203.

"ω" Flip-flop 2 through Key Company gate 250
08 and lights up the pilot lamp 235. In any case, memory 203 is active; if the end 1 is no, flap frog 20th is set to 1, and vice versa, memory 205 is cleaned, and the entry of the arithmetic data into memory is 1. Command automatically switched.

Also, by using one type of key group 217, 221K, it is possible to enter the long distance into the 2M memories 202 and 205.

(Relationship between sequence and machine operation) Figure 5 is a time chart showing the operation sequence of the Mlv4 copying machine.
L (002) R1eT111teIon <no'
t> Q:) There is a pigeon Of. First, when the power switch is turned on, the cleaning motor 3 is used to collect the residual toner that is dumped on the KIP 3 edge and to drive the conveyor belt.
20, Screen dust collection 615 (Fig. 1), Screen F
H 7 An 14 ($1 meat), two screen heaters 18 (Fig. 1), and a man fl*ll>7 An 525 that sucks toner floating in the current residue start driving,
This continues until the IWI switch is turned off. However, one screen heater is turned off when the formation of the 14th electrostatic latent image is completed.

Next, when the copy start key r8TABTJ is pressed, the screen drum motor 301 rotates.

At the time of jin, the reciprocating clutch of the optical system is activated, which causes
The optical system is driven synchronously with the screen drum. In FIG. 1, if the mechanism of the optical system is explained, the document on the document glass is illuminated by the document illumination lamp 52.
and a first reflecting mirror 5 installed integrally with the lamp reflecting mirror.
3 is a speed V that is mutually synchronized with the peripheral speed of the screen drum 1
Move with. The optical document obtained by irradiation with the original illumination lamp passes through the A1 reflection mirror 53, the #$2 reflection mirror 54, the lens 55 supported by the lens house, and the fifth reflection mirror 56 fixed to the lens house. Fourth reflection mirror 57
, and is projected onto the screen drum 1 via the fifth reflecting mirror 5B. The second reflecting mirror moves at a speed of 54%v in the same direction as A1 reflecting me y-55. In this case, the cam plate attached to the first reflecting mirror mounting base on which the first reflecting mirror 53 has been installed is sequentially connected to the micro switches (MB1 to M
86) while moving. The home position of the optical system is at the msl position, now 1-8 TAI
When the J key is activated, if the optical system is not in that position, the optical forward clutch 302 (Fig. 5) is turned on, and the screen/drum motor 501 is transmitted to the optical system Km.
The vehicle moves to the 81st home position, and the clutch 502 is turned off. At this time, if the screen drum is not at its drum home position, it waits until that time. When the home position of the optical system and the home position of the screen drum match, the optical reciprocating clutch 303 is turned on, the force of the screen drum motor 501 is transmitted to the optical system, and movement begins. Also, at this time, the document illumination lamp 52 (Fig. 3 50
4) lights up. The cam plate that moves together with the first reflecting mirror moves from the 81st cam plate to MB2. MBd is activated but electrically cut off.

At the 83rd stage, the (front) of the primary charger 4 is turned on, and then at the 84th stage
The (rear) primary charger turns on.

At the reversal position M82 of backward movement and forward movement, the optical backward movement clutch 305 is turned off, the optical forward movement clutch 302 is turned on,
When the movement of the optical system is reversed, the KAC static eliminator 6 (308 in FIG. 5) is simultaneously turned on. MEi4 again.

It operates in the 85th order, but is electrically cut off. Further, in step 85, charging of the primary charger (front) is terminated, and in step MBd, charging of the primary charger (rear) is terminated. Proceed further and find the optical system home position MS1
When it returns to , the optical forward clutch is turned off, stopping the optical system and simultaneously turning off the KM document illumination lamp 52. Furthermore, from the time of Jin, the timer will start working and the AC will start after a certain period of time.
The static eliminator 6 is turned off. Then, the screen drum comes to the home position 7. Screen drum motor 30
1 is turned off, and the insulated drum motor 328 is turned on.

Therefore, as is clear from the figure, screen drum 2
Rotation completes the formation of the stealth. In addition, outside of this process, the 8th
7. This is a safety device that will stop the machine if it overruns.

The insulated drum motor 32B rotates at about twice the speed of the screen drum motor 1. The screen drum and the insulated drum are connected to each other by a gear, and the screen drum and the motor for the screen drum, and the motor for the insulated drum and the insulated drum are connected by a one-way clutch, so both drums are connected by a one-way clutch. While the screen drum motor is opening, its peripheral speed rotates at the same time, and this turns off. When the edge drum motors are turned on at the same time, the speed of both drums instantly increases to approximately twice that.

During the simultaneous rotation of the screen drum motor 501 #i,,
The irradiation rung 5 and the entire surface irradiation lamp 7 are turned on, and the optical cooling fan 526 for preventing heat from accumulating in the optical system due to the irradiation from the illumination lamp 52 is opened.

In addition, at the same time as the FBTAB TJ key is activated, the powder image transfer charger 56, paper separation charger 37% insulated drum static eliminator 50, and paper separation suction fan 519 (Figure S) are turned on, and turned off when the copying operation is completed. do. However, the above-mentioned charging @
56,57.50 Lower the potential so as not to charge the insulated drum at the circumferential speed of the screen drum motor (Fig. 5, 317°5HI, !521).

Next, after the primary latent image is formed, the screen drum motor is turned off and the insulated drum motor is turned on, thereby starting a copying operation of modulation, development, one paper transfer, one minute M process. After conversion, the first sheet of copying is completed when the screen drum rotates five times, and after that, one sheet of copying is completed every time Fi1 rotates.

To explain this with reference to FIG. 3, first, the rotation of the drum is switched to the insulated drum motor 328, and at the same time the pre-modulation charger 31
0 and the transport roller clutch 516 is turned on to transmit cleaning motor 3200 power to the transport belt 38 (FIG. 1).

As the rotation progresses and the screen drum reaches its home position by 980"J, a modulation band I is formed to transfer the electrostatic latent image formed on the screen drum to the insulating drum.
The K device 311 is turned on, and the paper feed roller clutch 314 for feeding one sheet of paper on the paper feed table at 310 degrees is turned on.
Further, at 550', the current state motor 312 and the reversible toner bridge prevention motor 313 for stirring the toner staying in the developing device are turned on. After the screen drum starts changing v4, it enters the second rotation cycle and reaches 50t'
At this position, the paper feed roller clutch 314 is turned off, and the timing roller clutch 314 is turned off in order to align the leading edge of the paper fed from K with the leading edge of the paper currently being fed on the insulating drum. 115 is turned on. If the number of copies is 1
The pre-modulation charger N510 and the modulation charger 311 are turned off at the 80° position of the sheet, but in this case, it is the second fall, so do not turn them off.

Proceeding further, at 510°, supply l11a-ler clutch 5
14 is turned on and the second sheet of paper is fed. At 560°, turn off the first timing roller clutch 315.

Entering the third rotation cycle, the paper feed roller
The clutch 514 is turned off, and the second timing roller clutch 315 is turned on. At step 801', the pre-I&key charger 510 and the modulation charger 511 are turned off. However, if one copy is to be made, the current output motor 312 and toner bridge prevention motor 313 are turned off. Turn off the timing roller clutch again at 560@. Entering the fourth rotation cycle, at 80 degrees, the current rotation motor 312 and the toner bridge prevention motor! S1! Turn off S.

At 3606, the insulated drum motor 328 and the conveyance-one-two clutch 316 are turned off, and the retention four-day cycle is ended. The separating pawl solenoid 329 (Fig. 1) that separates the paper from the insulating drum is operated as shown in Fig. 3 by counting pulses from the time when the leading edge of the paper passes between the rung 69 and the light receiving element 70 (Fig. 1). Work in a position where you can.

When all the copying operations are completed, an electromagnetic brake 327 that stops the drum from overturning operates for a certain period of time.

(Description of Sequence Control Circuit Configuration) FIG. 4 is a block diagram of the control section. Signals from the keyboard that issue operating commands from the outside, detection signals for the home position of the screen drum that serve as the reference for Kukens, signals from the pulse generator synchronized with the rotation of the insulated drum, and -
Six micro-switch signals are input to the central control unit to determine the timing of medical document image formation. Based on these input signals, the central control section makes full use of 2 memos and 13 counters to perform storage and judgment, and outputs appropriate signals to the interface section.

The screen drum home position is determined by the detection pulse 350 (Fig. 5) and the magnet 6B on the screen drum and the magnetoelectric transducer 67 (Fig. 1).
Obtained every time you rotate.

Determination pulse 351 is obtained after the electrostatic latent formation on the screen drum is completed and the optical system returns again to its home position M81, followed by the home position of the screen drum. At the time when this judgment pulse (1) 5510 occurs, 1111 memo! J-(1) 202 and screen/drum counter 40? are equal or not, 8th OP
By determining whether a command is given or not, start the motor for the insulated drum to start the process of forming the second doctor, restart the formation of the primary latent image, or stop the motor for the screen drum. Then, it is determined whether the sequence ends.

The above decisions can be expressed in a flow chart as shown in FIG. ttbThe above decisions are made sequentially■.

Indicated by ■, ■. Furthermore, turn Jin's flow chart into an electrical circuit! ! If the vertical busbars shown in FIG. 6 are defined as columns and the horizontal busbars are defined as lines, they are connected to control command columns 601 to 604, respectively, indicated by ◇ in FIG. Further, the signals are inverted by signal line inverters 605-60B and connected to columns 609-612. line 615
~ Connected to the power supply with a 617 resistor. This power supply must be at a logic level of 1".

For example, the condition ■ in Figure 5 is ``There is no 8TOF instruction,
Pilot rung 1 is not lit and memory 2 contains a value. ”, so if we express this in a logical formula, 1■== F8TOP・FBco・工'l=Q
''. Therefore, column 609゜610.611
By connecting a diode to each of the lines 615 in the direction shown, an AlID circuit is formed, and the lines 409 and 410
, 411 is @1″ level, line 615 is @1
"level. In other words, when the condition ■ is satisfied, 2-in 615 becomes @1".

-”, condition line twin 615-617 that becomes ■ ~ [phase]
is output to. Furthermore, lines 613-617 are inverted by inverters 618-622 and connected to twins 625-627. Connect the columns 628 to 430 that intersect with the O line 625 #627 to the electric terminal Ij11 with a resistor, and again,
If we form a diode matrix here, line 6
SoK's "■Also Welfare" condition was established and Mi @ 0 at 9
In addition, the output 644 of the inverter 655 becomes 1 +@' according to the logical formula, and only when the above conditions are satisfied, the output 644 of the inverter 655 becomes 1.
” level. Therefore, this is the discrimination pulse (1) F
By passing the screen/drum home position pulse DEF, which is at the 9th point in time between Jl and the operation, through the gate 63B, an operation command (■) indicating the end of the sequence can be issued and the memory circuit can be latched. Similarly, it becomes possible to issue command signals of ■■. ■For the signal, use the aforementioned charger! The output of 4,57.50 is lowered as shown in FIG.

Now, when the condition ■ is established and the signal ■ is obtained, the screen drum motor is turned off, the insulated drum motor rotates, the drum speed is switched to bulk speed, and the gear is synchronized with the sheet drum. , the disk s9 rotates. When the hole drilled on the circumference of the disk 590 passes through the gap between the light emitting element and the light receiving element 66, a click pulse is generated! ! s2 (Fig. 5), this clock number (one clock per revolution of the Rus screen drum) per revolution! Generates 560 pulses. Since it is difficult to drill one hole per degree in a disk with the same diameter as the screen drum, a separate disk is provided and the rotation of this disk is made n times that of the screen drum using a gear, so that the number of holes in the disk is t/ I'm asking you to make it n.

In this device, in the process after modulation, this clock pulse is processed to become a driving signal for the equipment.

That is, in the Pro-7 after modulation, as shown in Figure 5, the first insulated drum completes one and a half rotations, and the second
Since the copy is made every half rotation after the first sheet, by setting the sequence control standard to the middle rotation of the insulated drum, that is, one rotation of the screen drum), the clock pulse is 552.
5th edition, 2 evolution 4560 over counter, 5th
This is to output control pulses 555 to 5450 in the figure.

An example of a circuit that generates this control pulse is shown in Figure 7. Ten flags and flags are connected to generate clock pulses from O to O.
55! Form a counter that counts up to 's60. The first four 7 lip-flops a10 digits are shown, 6
~! A decimal counter that repeats the count up to the next 04 7-lip digits, 1 indicates the 100 digit, a decimal counter that repeats the count up to O, the last 2 digits indicate the 100 digit, and the 3 It is a counter. However, a reset signal is output from the decoder to 0, and all 7-lips and 70-tubs are set to 0. In this way, it becomes a 36o decimal counter that repeats the count from KG to 559 every revolution of the screen drum. The control pulses 535-5asof14 in FIG. 5 are generated by decoding the output of the counter described above with the matrix 1 path (decoder) in FIG. Also, number 3! 5! ! l's! If you change the timing of the 510-514 sequence, you can change the position of the decoder diode arbitrarily. Paper timing, developed 1If on the leading edge of paper and drum
You can easily make subtle adjustments such as cash register storage with 4 pictures.

In FIG. 5, for example, if the number of copies is 1, the pre-modulation charger 310 is turned on at 80 counts of the second cycle, and if the number of copies is 2, it is turned off at 80 counts of the second cycle. , requires selection of control pulses to turn off at 80 counts of MS cycles.

The present invention consists of 12 insulated drum counters x as shown in FIG.
By counting the discrimination pulse (2) using c and xc' and comparing the count value with the memory (2), the selection is made easier.

That is, count @1” from 2 cycles to %1!I47
The insulated drum counter IC is activated, and when the value of the counter and the memory (2) storing the desired number of copies are equal, the on signal during that cycle is killed. Thereafter, the ζO counter is stopped. However, one example is Timing Award - Ra Clutch Co. @ 2 cycles, which operates on the first sheet of paper for the first time. However, when comparing the insulated drum counter IC and memory (2), 1II
I book counter company number! 1-? In one cycle, the operation of this clutch for the ninth sheet of paper, which is already equal to memory (2), is not carried out, and therefore the insulating drum counts up one count later than the above-mentioned counter. - Controls on/off of the clutch by comparing counter XC' and memory (2).

Insulated drum counter IC is % figure 5 case! It
The percent insulated drum counter E C' matches memory (2) on the fourth cycle while it matches memory (2) on the h cycle and stops counting. Therefore, the insulating drum counters (1) and (2) coincide at the 49th cycle.

The coincidence of these two counters means that it is the final cycle of copying, and at the last time of the cycle, that is, at the time of judgment pulse (2), the two counters are cleared and the screen/drum counter and the latent It is checked whether the memories (1) storing the desired number of image formations match, and if they match, a copy end command is issued and the rotation of the drum is stopped. If they match, as mentioned above,
Turn off the insulated drum motor, turn the screen drum motor, start exposure, and repeat the same sequence after forming the medical document image. Figure 16 is a diagram showing an example of drive control for each device, and 310, 312, 514, and 315 are the paper feed roller clutch, pre-modulation charger, developing motor, and timing roller clutch in Figure 3. fi, 160 company The amplifier that operates this, 169,170 are Tsuritsubu frog gates, 161.164, 166.168 are inverters, 162 company Nant gate% 165 is Noah gate.

165.167 Fi and gate. - with the sheet value setting memory (2) of the counters xc and xc'
When the pulse is determined by each matching circuit, the on/off pulse is stopped and the equipment is stopped by the off pulse, and the equipment can be controlled at a predetermined timing.

Next, the case where the transfer paper jams is explained as shown in Fig. 6. When the paper jammed in the conveyance path, the paper did not separate properly after transfer and was moved with gk stuck to the insulated drum. case,
To detect a jam when two sheets of paper are fed, tf
Light source 6 in figure J1! A light receiving element 70, a light source 71, and a light receiving element 72 are provided. When the leading edge of the paper blocks the light 1li69, the receiving element 70 picks up the pulse of the clock l (lux generator) and sets a jam counter. When the leading edge of the paper blocks the light source 71 (8GO), the light receiving element 72 decodes the output of this counter and outputs a separation confirmation detection pulse 8DP.The count number of this detection pulse is determined by the light source 69. It corresponds to the transport distance from light # to light #71.

Therefore, if the paper is jammed in the conveyance path or cannot be separated, even though the separation detection pulse is output,
The paper does not block the light source 71.

Therefore, the jam signal JP is output in a circuit as shown in figure b.
In figure b, 81 is a gate, and 82 is a 7-rig gate.

Also, using this counter, separate the separation claw 75 (Fig. 1)
It is possible to output a pulse signal from the same decoder to create the timing to activate the decoder.

See Figure 9 for sequence control unique to the present invention after jam detection! ,! I) iQ clear. In the event of a jam, the insulated drum motor is immediately stopped using an electromagnetic brake and all sequences are turned off, but repairs can be made without turning off the power switch. and,? 1i training,
The counter display stands still until t when the count number at the time of jam is displayed. When the repair is complete, again (
Pressing the -8TARTJ key will rotate the screen drum motor and rotate the screen drum to its home position. Then, at the home position, turn off the screen drum motor and turn on the insulated drum motor.

Since the electrostatic potential of the screen is maintained even during the jam repair, the sequence operation after the above-mentioned modulation is restarted.

The details of the timing are shown in Figure 9. In the sequence after the change, the first one, after the jam, the first one to restart.
For example, the insulated drum must make one and a half rotations (31 rotations of the screen drum), so when restarting after a jam, keep the line, insulated drum counter I have to create the timing for the first sequence. For this purpose, as shown in Figure 99, in the 1st cycle and the 2nd cycle of the sequence, create a prohibition time 1 and a prohibition time 2, and use this to control the first sequence. , and the insulated drum counters 1 and 20 count up at the beginning of the fifth cycle.Sequence control after row -1 is the same as normal control.

The following cases can be considered as cases where a jam occurs. ■
When the 11th sheet jams, jam when the jamb, insulated drum counter 1 (IC) and 2 (IC') ~ memory (2), ■ Jam when XC = memory (2) J ■ XC'
= Jam when memory (2).

The movement of the counter when restarting after a jam is shown below, provided that memory (2) = 4.

/ , 7/ / /' / , / /''' In the case of ■, count up both M!!t cycle and IC9 engineering C'.In the case of ■, count up engineering C in 5 cycles.
′ is counted up, and C=IC′ becomes,
It ends at the end of the fifth cycle. In the case of (2), even if the fifth cycle is entered, the count is not incremented, and at the end of the fifth cycle, IC=C' is confirmed and the process ends. ■ and ■ ultimately end in the same cycle, but this is because the jam occurred near the paper leading edge detector due to reasons such as "@2-sheet feed," or when the paper was not separated properly, etc. This is because even if the paper is the same, there will be a difference between ■ and ■ depending on the time difference in jamming.

A method of controlling the sequence using prohibited times 1 (1!1111) and 2 (ntn2) will be described. In the sequence of restarting after a jam, the first sheet must not be copied and displayed under any circumstances, so in prohibition time 1, 31 in Figure 5 is used.
0 to 3140 functions Turn on at appropriate timing. 515 is also turned on at the appropriate timing of the time of NH1/III2.

Next g IMHl, 1882 e) flFMIte, 1
sle, 311 Ktsu I/ compares the contents of the counter IC and memory (2), and if they are already equal, turns off, and 314 i also turns on if they are equal.
. Regarding the cycles after xNH2, since the IC1 and C' counters are controlled as described above, they are controlled by comparing the memory (2) with these two counters, similar to the control in the normal case.

The circuit acid that generates the prohibition time signal XMH1,l;
It is as shown in Figure 18 1, with 181,182 companies in the figure, 7 listings, 0 tubes, 18! S, 184 is goo), FR8TR
T is the start signal related to MK during rotation of the insulating drum, FJ
2 is the judgment pulse (2)], the gate 1113.184
K outputs l1lB1.2 at the timing shown in FIG. The device O drive and counter stop during this prohibited time are controlled by a circuit as shown in FIG. 21.On and off pulses a#! 5 This is the same as the sequence pulse in the figure.

The control of the sequence of latent image change R bales described above is based on the decision 7a in FIG.
! A method similar to that of the judgment circuit shown in FIG. 6 is used. As is clear from the foregoing description, each cycle after lpl corresponds to one cycle of the 560-decimal counter that counts the p-k pulses. Pulses 34 to 45 in the tsS diagram are generated at a certain number of counts in each cycle, but since all of them are used, they are used only in cycles where the conditions are met to turn on the latching flip-flops of the related M&amp; Also, since it is expanded off, the 360-decimal counter 00 to 55
You can create a flow with 9 as a loop. An outline of this blowing is shown in FIG. 10, and if the flow is further represented by an electric circuit, it becomes as shown in FIG. 11. As described above, it is possible to incorporate a program of a series of sequences based on pulse counting into a circuit that has a diode matrix and an inverter consisting of two blocks, and therefore, it is possible to use this program without any switches. It is possible to control the sequence tube without using it. In Figure 10.11, 5etFHV? 5 is pre-modulation charger on, R@Il
l@it FCL5 is the paper feed roller drive off, Set
FCIJ4 is a command to turn on the drive of the timing roller, and the copy star after FRBTRT's modulation) M
The process F is used to judge whether or not it is multi-retention. 1s10 The blank section in the figure can also output an operation command for the required equipment at the corresponding count in the same manner as the flow at count 50. Furthermore, operating circuits for other equipment can also be formed as shown in Figure 11.

Next, in terms of means for stably performing retention, the electrostatic latent image formed on the screen is a result of spontaneous discharge of charges as the retention rate progresses, and the potential decreases.

The developed entertainment image is affected by dullness, contrast, etc. Therefore, in the present invention, in order to correct the change in the image due to the decrease in the potential, the potential of the modulated charging amount is increased as the retention rate increases. This device's location 4t
a, As shown in Figure 12, after the 2nd stitch of the potential line in the 1st sheet) After the bulky test, 1a, &, stepwise increase the potential at the 50th sheet, 50th sheet, 70th sheet, and 90th sheet. to rise to.

It is possible to raise and lower the potential by varying the input voltage on the primary side of the high-voltage transformer. To explain this using Figure 15 as an example, it is possible to raise and lower the potential by connecting six resistors in series and using a relay that operates as the number of retention points increases. By successively shorting these resistors, the potential is increased. These resistors may be connected in series, or different resistance values may be connected in parallel and each of them may be switched. The timing for operating the switches such as the relays is shown in FIG. 14. This timing can be created by combining the insulated drum counter (1) and the modulation charger on-pulse.6 For example, in the case of this device, the 2nd, 10th, 50th, 50th, 70th Since the potential is changed at the 90th and 90th sheets, as shown in FIG. 15, the timing to activate the relay is when the modulation charger on pulse is gated by the decoded output of the insulated drum counter (1). Therefore, 2nd branch IC = 1.10th branch IC
=9.30th sheet Bxc=29.50th sheet IC=49.
For the 70th sheet, IC = 69. For the 90th sheet, when IC = 89, the clock pulse = 8 [At one count, operating pulses 1 to 6 are output to the relay, setting latches 1 to 6,
Activate coils 1 to 6 on the relay.

Next, a reasonable accounting method for copying fees in the copying apparatus of the present invention will be explained. The light source that exposes Mth is used only during the process of forming the primary latent image, and deterioration of the i9 photoconductor is generally caused by the passage of current through the photoconductor, so the light source and screen photoconductor deteriorate. It mainly occurs during the step of forming the first electrostatic latent image, and has little to do with subsequent steps. Therefore, in such a copying device, when accounting for copying fees, in addition to charging fees differently depending on the size and paper quality of the copy paper as in conventional copying devices, An accounting method is required that takes into consideration the differences between the process of forming the primary latent image on the body and the subsequent process of transferring it to copy paper. An example of this will be explained based on FIG. 19. In the figure, 191 is a total counter that counts the same number of electrostatic IW caps formed on the screen photoreceptor; 1tl of the process of developing an electrostatic latent image and transferring the developed image to copy paper
The other numbers for counting the number 1 (which corresponds to the number of copies made) correspond to the numbers in FIG. 2 (operation panel block diagram). Let me explain its operation. Each time the original image is exposed and an electrostatic latent image is formed on the screen drum, the count-up switch 241 is turned on and off again, and the values on the counter 201 and the total counter 191 increase by one. A counter 201 stores a memory 2 of a preset number of copies as the device repeats a series of copying operations.
It is cleared when it matches the contents of 02.

However, the total counter 191 continues to count even for the next copying operation without being cleared. In other words, if the original picture is changed and a new number of copies is set, the counter 201 will change from 1 to 2, 3, etc.
・I start counting, but the total counter is 191.
Counting starts from the previous count value +1. In addition, each time the count-up switch 242 in the process of forming a secondary image, developing it, and transferring it to copy paper is turned on and off, the counter 204, )-total counter 192tL, respectively, It performs the operation corresponding to the counter 191, and continues to count the total number of nine photographic sheets without clearing the contents of the total counter 201i. The number of times an electrostatic latent image is formed on one screen drum in this way,
The subsequent work up to the transfer of the visible image to the copy paper is counted separately, and each total counter is calculated as a separate fee when collecting the copy fee.Account for the copy fee as 0 or more. For example, when a large number of copies of the same original picture are made, the unit price of each copy becomes cheaper as the number of copies increases, thereby achieving an accounting system that takes advantage of the percent mold of the present invention.

The above description has been made by taking as an example a copying yellow image in which a visible image is transferred to plain paper. However, the present invention is capable of transferring a nine latent image formed on a photoconductor at the very front, etc. Even in those using the so-called Txax method for making copies, the secondary latent image on the insulated drum can also be converted to Y! Pass the L-cut paper, develop it, and grab it.

[Brief explanation of the drawing]

Figure 1 is a schematic sectional view of a copying machine according to the present invention; Figure 2 is a drive circuit diagram of a display in a copying machine RK according to the present invention;
#43 (a), Italy) is a time chart of equipment operation in the copying machine according to #IK of the present invention, Fig. 4 is a block diagram of the control section of the copying machine according to the present invention, and Fig. 5 is a sequence judgment diagram. Figure 6 is an example of a circuit diagram embodying it, Figure 7 is a drive circuit diagram of each device, Figure m8 (a) #
(11) is a time chart and circuit diagram of jam detection operation, Fig. 9 is a time chart of equipment operation after jam detection),
The ta1O diagram is a flowchart for more detailed sequence judgment, Figure 11 is an example circuit diagram embodying it, Figure 12,
Fig. 13 is a graph and circuit diagram for correcting the gradient change in beam tension copying, Fig. 14 is a time chart of the operation shown in Fig. 15, Fig. 15 is a drive circuit diagram of Fig. 13, Figure 16 is an example of the drive circuit of the device in Figure 3, Figure 17 is a cross-sectional view of the screen photoreceptor, Figure 18 is an example of a prohibition time signal generation circuit in the event of a jam, and Figure 19 is a schematic diagram of the system. Figure 20 is an example of a charger output control circuit; Figure 21 is an example of a signal generation circuit for Figure 16 using Figure 1B; A drum counter, 203 is a second mesori-1413 is an @1 insulated drum counter, and 414 is a second insulated drum counter. Applicant Canon Co., Ltd. Procedural Amendment (Method) Kazuo Wakasugi, Commissioner of the Patent Office1, Indication of % Patent Application No. 208910 of 19882, Name of Invention Image Forming Device 3, Person Making Amendment Case Relationship with Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (100
) Canon Co., Ltd. Representative: Ryu Kaku 3-4, Agent Address: 3-3.0-25 Shimomaruko, Ota-ku, Tokyo 148
Date of amendment order: April 26, 1988 (shipment date) 6. Specification and drawings subject to amendment 7. Engraving of the specification and drawings to be amended (no change in content). Procedural amendment (Mr. Kazuo Wakasugi, Director General of the Jittan Patent Office1, Indication of the case, Patent Application No. 208910 filed in 19822, Name of the invention image forming device 3, Person making the amendment Relationship with the case Patent applicant) , Location 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (10
0) Canon Co., Ltd. - C5, Specification subject to amendment 6, Contents of amendment (1) The following is added after "ru" on page 1, line 20 of the specification. ``In other words, the present invention provides input means (2) for setting the number of images to be formed.
1? ), jam detection means (Fig. 8(b)), counting means for counting the number of formed images (413, 414 in Fig. 2),
), the image forming apparatus is characterized in that the count number of the counting means is held when a jam is detected by the jam detecting means, and the counting operation of the counting means is prohibited when restarting. J//'8. / / (2) Correct r409J on the 5th line of page 32 to ``r201'', and after ``do'' on the 11th line, ``Therefore, 5TO
It is possible to stop the device without manually feeding the first sheet. ” and “of read-only memory” is added before “electricity” on the 15th line. (3) Add "(Figure 11)" after "59" on page 35, line 8. (4) Add ``This is inconvenient.'' before ``Therefore,'' on page 39, line 13. . (5) Change “34-45” to “334” on page 49, line 10.
~345''. (6) Added "read-only memory" after "waited" on page 50, line 5, and added "In this way, it is possible to avoid complicated configurations" after "is" on page 51, line 2. "Stable timing control is possible." is added.

Claims (1)

[Claims] It has an input means for setting the number of images to be formed, seven stages of jam detection, and a counting means for counting the number of images to be formed, and when a jam is detected by the jam detection hand stripes, the count number of the counting means is held, and when restarting, the above An image forming apparatus characterized in that a counting operation of a counting means is prohibited.