JPS58179872A - Image forming device - Google Patents

Abstract

PURPOSE:To improve the accuracy in sequence control by executing counting of a series of pulses synchronized with a rotating body for latent image formation for the purpose of sequence control of image formation according to the detection signal of a transfer material. CONSTITUTION:The plural apertures of a disc 59 which turns in synchronization with a screen drum 1 for primary latent image formation and a screen drum 8 for secondary latent image formation are detected optically and a series of pulses are formed. The pulses are counted with a counter and the sequence control for image formation and detection of jam are accomplished by the timing signal corresponding to the count value. The counting is executed according to the pulses detected by the optical detecting means 69, 70 of transfer paper provided in the passage for transfer paper 31 before said paper is separated, whereby the inconvenience that the sequence timing signal is generated while no transfer paper is fed is prevented. As a result, the accuracy in the sequence control for image formation is improved by the correct timing.

Description

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

Examples will be described below with reference to the drawings.

Figure 141 is a cross-sectional view of the copying apparatus of the present invention, and the mechanical configuration thereof will be described below.The screen photoreceptor (Figure 16) with an OSWI configuration has a ring-shaped end and is connected by a connecting band to be integrated. A metal screen drum is stretched with I-KI adhesive or the like, and is constructed as a screen drum 1 on a tubular screen drum shaft 2. Also, in consideration of the application of bias voltage, screen drum flanges made of insulating material are fixed to each end of the screen drum l using screws, etc.
The front of the screen drum 7 lunge has an opening so that a modulation charger ti and a modulation type charger 13 can be installed in the screen drum 1. The screen drum 7' langes are mounted on a fixed tubular screen drum shaft 2 via ball bearings. The screen drum 7 is rotatable around the flange of the screen drum shaft 2.

The screen photoreceptor of the screen drum 1 has a photoconductive member 71 and an insulating member 7 on a conductive member 70 having a large number of fine holes.
2 are laminated so that one side of the conductive member is exposed. The conductive member is made by threading thin metal wires of stainless steel, nickel, etc. into a net shape. The mesh value of the conductive member is 100 to 40 from the point of reference for copying.
0 mesh and an aperture ratio of more than sob are suitable. The photoconductive member is made by vapor deposition of S, alloy, etc., CdS,
It is created by spray coating, etching, etc. using a dispersion of an insulating resin containing particles such as PbO. The insulating member is made of a solvent-based organic insulating material such as epoxy resin, acrylic resin, and silicone resin by spraying or vacuum deposition. However, it is possible to make the conductive member exposed on one side by coating or spraying the conductive member from one side, and then grinding the contact member that wraps around the conductive member.

The following devices necessary for forming an electrostatic latent image on the screen photoreceptor are arranged in the screen drum 10 times. A pre-irradiation lamp 3 is provided at the ninth position to erase undesirable ghosts on the screen photoreceptor, and a primary charging gs4 applies a uniform electrostatic charge to the screen photoreceptor. Since the diameter of the screen drum is relatively small, during the formation of an electrostatic latent image on the screen photoreceptor, the 'IIm end may be charged again even though the electrostatic latent image has already been formed. Therefore, the primary charge 1i+4 is divided into two parts, and the conductive voltage and the same current are applied to each part with a time gap. The AC static eliminator 6 is
In place of the 0% AC static eliminator provided in the ninth position, which eliminates the charge on the photoreceptor according to the light image 5 of the original irradiated with the WA draft S, the polarity is opposite to that of the primary charger. You may also use a DC static eliminator. The full exposure rambla is one of the screen photoreceptors.
It is used to increase the contrast of the next scene. In addition, in close proximity to the screen drum 1, and ensuring a small distance, a thin tightening layer is placed on the conductive member. ! 4P3 peak drums 8 coated face down are arranged in parallel. The screen drum 1 rotates in the direction of the arrow A, and the insulating drum B rotates in the direction of the arrow B.

Inside the screen drum 1, a rail IOK modulation charger 11, which is coated on an insulating block 9 facing the screen drum 1 and closest to the insulating drum 8, is installed on a rail 12 coated on the insulating block 9. A heavy-duty charger 13 is attached to each.

In addition, dust may adhere to the screen drum l, causing the 1st #* and 2
In order not to interfere with the formation of the next latent image, the air blower 14 and the discharging device 15 in the middle remove the floating dust (background of the discharge device).
16, the screen drum IK can be blown with clear air from the dust removal nozzle 17. Also, if the screen photoreceptor has a low temperature or has a negative effect on humidity tK, the air being blown is heated by the heat source 18. It's okay. When obtaining a large number of secondary mm by the primary latent on the pre-modulation charger 13ri screen drum l, apply a voltage of opposite polarity to that of the modulation charger 11, which can ensure that the potential of the primary latent remains constant from beginning to end. The secondary layer *Fi** on the insulated drum 8 is developed by the device 20. The developing device 20 includes a toner replenishing device 22, is separated from a current supply portion 24 by a partition plate 23, and stores toner for development.
25 company toner distribution Low two 26 rotation, current gII
It is sent into device 2G.

The current conventional toner 25 is sufficiently agitated by 270 rotations of the agitation roller, and the sleeve 2 with the magnet 28 inside.
9, the electrostatic S on the insulating drum 8 is developed.

The paper feed tray 30 can load a large t (2,000 to 4,000 sheets) of copy paper, and so that the topmost copy paper 31 is always in a constant position, the upper east position is detected and the paper is lifted by the amount reduced. It rises along the guide rail 32 by driving the motor.

From the top of the paper, the big up roller 33 creates an image on the insulated drum 8. The copy paper is sent out to the matching ridge, and is further moved by timing roller 34 to vliWa#I! on insulated drum B. The transfer charger 36
The st+iii image on the insulating drum 8 is transferred onto the copy paper. Secretly, the separation charger 37 reduces the adhesion force between the P-edge drum 8 and the copy paper, and the copy paper is separated and conveyed from the insulating trim 8 by a conveyor bell (8) having a built-in spool 1 and yellow 39. The conveyor belt 38 is driven by a belt drive roller 40. a-
The rollers 41 and 42 rotate and transport the copy paper while sucking it, and then the rollers 43.
A conveyor belt stretched over 44 transfers the copy paper to a fixing roller 45.
send to Then, the powder scratches on the copy paper are fixed by the S fist, and the copy paper is received by a tray 47 along a guide 46.

(Explanation of operation specifications of key operation panel t!i4) Operation of the copying apparatus of the present invention is performed by commands from operation *61 in FIG. The display board 61 includes two displays W62, 63.2 pilot lamps 65.66, and a keyboard 64. The key rOJ (0RIG) on the keyboard 64
INAL) is used when setting the number of electrostatic waves formed on the screen drum 1.

If you press this key Kfi and the numerical keys from "0" to "9"! The content of the second press is entered in the display 1162. Also, after arriving and the numeric key is entered, "■"
When the key is pressed, the contents of the display 620 are cleared L, r
-Turn on the pilot lamp 65 of J ◇ Conversely, “ω
” After the pilot lamp lights up, if you enter the numeric key, the pilot lamp goes out and the numeric value is entered on the display 62 ◇In other words, the numeric data and ra5
The J command is automatically switched. Note that the operation of "φ" is to be performed indefinitely until the r8TOPJ command (described later) is received.

Next, Φ-rRJ (RETENTION) is used to set the number of copies that can be repeatedly obtained by one electrostatic atom formed on the screen, and in the number fL -
Alternatively, the entry of the "ω" key is the same as that of the "0" key, and its contents are displayed on the display 63 or pilot lamp 66. For example, <12'3> on the display 62,
The key operation when entering the display device 63K<456> is "0" → rlJ → "2" → "3" → "R" → "4"
→ “5” → “6” 0 Therefore, “O” ~ rQJ
Change the numeric keys and the "ω" key to two functions.
Switch between keys rOJ and rRJ and display 62 on 27.
．． 63° or pilot lamps 65 and -66. Of course, either the "0" key or the rRJ key may be designated first.

Next, the rcOJ (CLEAR0RIGINAL) key is used to clear the display 62 or pilot lamp 65.
If you want to correct the entry entered as <3> to <456>, press the keys in the order of Fi "CO" → "0" → "4" → "5" → "6". rCRJ(CLEARRETEN
TION ) key 4 has the same purpose, display 463
Or clear pilot light 66.

r 5TART J key i [Used to start the copying operation, but if the contents displayed on the display 62, 63 and) pilot lamp 65, 66 are in an unreasonable combination, r 5TART J key ti is activated. It's not easy. The unreasonable combination is when the content of display 62 is <000> and when both pilot rungs 65 and 66 are lit. The reason for the former is that it is impossible to copy without forming an electrostatic latent image on the screen/drum at least once, and the reason for the latter is that an electrostatic latent image is formed once on the screen/drum. This is because it is impossible to perform an infinite number of retentions at once.

Also, once the r 5TART J key is activated, the copying machine starts operating 1411. Once started, keys other than r 5 TOP J will not operate from MK during inhibition described later.

Father, if (003> is entered on the display 62K<002>, 63, after the primary latent image is formed on the screen drum,
Six copies are obtained by repeating the modulation, development, and transfer cycles three times in succession, and then repeating this cycle again. At this time, when the r5TART J key is operated, the two displays display <000>, and as the copying operation progresses, <001><002>, etc. are displayed.

(Description of operation panel circuit configuration) Figure 2 is a schematic diagram of the operation panel circuit according to the present invention. Memory 202. A counter 201 corresponds to the display 62 and stores and counts the number of electrostatic latent images formed on the screen drum. Memory 203. The counter 204 is displayed! Corresponding to 63, one primary latent Il
\ is used to store and count the number of copies to be made. These counters 201 and 204 can be a screen drum counter or an insulated drum counter, which will be described later.

To explain the circuit operation, 217 to 221 refer to a group of keys on the sweeping board, and the signals of these switches are gated by the output signal 214 of the inhibit circuit 216, and this signal @214F
Normally, it is at the 11" level, but when the inhibit circuit 216 is activated, it goes to the @0" level and does not output even if the key group is swept.

The inhibit circuit 216 is composed of flip-flops 209, 210° 211 and two OR gates 222, 223.
It memorizes important information regarding jams, such as when the J key is pressed, when the r8'l'OP J key is pressed, when 1 paper is misaligned, when 2 sheets are fed, when 9 sheets are not separated properly. Clip 70 tube 2
Both 09 and 210 are never set, and when one is set, the other is reset.D 5TART
Also, when the clip flop 211 is set, the flip flops 209 and 210 are always reset, and the oOR gate 222 and 223 interrupt all OH operations when the paper jams.
The outputs of are normally at d@l' and @O'' levels, respectively, but when any one of the 7 lip and 7 o tubes 209 and 210° 211 is set, these are inverted to 10'' and '1'' levels. r8TARTJ o-e r 8TOP
When either J'P-e or expanded JAM detection is in operation, the prohibition circuit 216 is activated and the signal 11214 is set to ``O''.
''', the signal line 215 becomes @1'l'c. Therefore, the key group 217, 218° 220, 221 on the operation panel is inhibited, and at the same time the gates 225, 226 are closed, and the 224
．． 227 opens and shows @62. Memory 20 on display 63
2. Sho counter 20 replaced with the contents of memory 203
1. The contents of the counter 204 are displayed.

During the copying operation, keys other than the r5TOP and J keys do not work. Therefore, the r 5TART J key works and 9 o'clock is the end.The counter is zero, so the display 62 shows (00
2>→<0θO>, 63ti<003>→<000> becomes a trap. However, as the jar copying operation progresses, this value is counted up, and when the corresponding memory value and the counter value become equal, the copying operation ends. In preparation for this operation, the 1 indicators 62 and 63 are cleared to zero and display the numerical values in the memory again.

If the r 5TOP J key is pressed at any point during v1 operation, the operation will end at a good point in the process from that point on.Next, the 7 rip-flops 205 and 206 will each
It remembers that the OJ key and rRJ key have been pressed, and neither of them is set; when one is set, the other is always reset.

Now, when the "0" key is pressed, 7 rip frog 205
is set, gates 228 and 229 open, and then when any key in the numerical value group 217 is pressed, gate 2 opens.
28 is entered and the value is stored in the memory 202. At this time, if the pad lamp 234 is lit by the 7lip/70 knob 207 that remembers that the ra81J key was pressed, the signal @232 to reset this and turn off the lamp. In addition, when the numerical key details 2170 are pressed, the "mouth" key 221 is pressed, through the gate 229, sets the Tsuritsubu prop 207, lights up the pilot lamp 234, and at the same time some numerical values are already stored in the memory 202. If it is, clear it using the signal line 233. Therefore, the entry of a number into memory and ``φ
” commands cannot be fulfilled at the same time, and if one is true, the other is always not true0.Furthermore, when the “R” key is pressed, the flip 70 knob 2
0B is reset, flip 70 knob 206 is set, and game) 230 and 231 are opened. Below, the above rOJ
As with the key, the key number 217 is the gate 23.
1 to enter memory -203, and the "■" key passes through gate 230, sets flip-flop 208, and lights pilot lamp 235. This too.

When the memory 203 is entered, the 7-rip-flop 208 is activated, and when set conversely, the memory 203 is cleared, so that the entry of numeric data into the memory and the "no" instruction are automatically switched. -0 Also, by using one type of key fF217, 221, two tanks of memory 202. Input can be entered into the memory 203.

(Relationship between sequence and machine operation) Figure 3 is a time chart showing the operation sequence of the copying machine shown in Figure 5tsH.
L<002>RETENTION<002
> is the case. First, at the same time as the power switch is turned on, a cleaning machine 20. Screen dust collector Ill 5 (Figure 1).

The screen dustproof 77n 14 (Fig. 1), the two screen heaters 18 (Fig. 1), and the current dust collector 7an 325 that sucks the toner floating in the shoulder incubator start driving.
It continues until the power switch is turned off. However, one screen heater is turned off when the first electrostatic latent formation is completed.

Next, when the r5TART J key for starting copying is pressed, the screen drum motor 301 rotates. At this time, the reciprocating clutch of the optical system is activated, and as a result,
The optical system is driven synchronously with the screen drum. 1st
Referring to the figure, to explain the contact of the optical system, the document on the document glass is illuminated by the document illumination lamp 52, and the document Ne! The first reflecting mirror 53, which is installed integrally with the four lamps 52 and the lamp reflector, moves at a speed Ifv that is synchronized with the circumferential speed of the screen drum 1. The light obtained by irradiation with the original illumination lamp passes through the first reflecting mirror 53° and the second reflecting mirror 54, and then passes through the lens 55. which is supported by the lens house. Furthermore, a second reflection mirror 56 installed in the lens house Kfi. The fourth reflection mirror s7I*s is projected onto the screen drum IK through the reflection mirror 58. tIC2 reflection mirror 54
The first reflection moves in the same direction as the mirror 53 at a speed of 1/2V. In this case, a cam plate attached to the M1 reflecting mirror mount on which the first reflecting mirror 53 is installed is moved while sequentially operating the micro switches (MSI to M86). The home position of the optical system is at the MSl position, and if the optical system is not in that position when the 5TART J key is pressed, the optical forward clutch 3
02 (broom 3) is turned on, the drive of the screen drum motor 301 is transmitted to the optical system, and its home position M81 is turned on.
and then turn off the clutch 302.

At this time, if the screen drum is not at its drum home position, it remains on standby. When the home position of the optical system and the home position of the screen drum match, the optical double-acting clutch 303 is turned on, and the force of the screen drum roller 3010 is transmitted to the optical system to start moving. , the original illumination lamp 52 (304 in FIG. 3) lights up ◇The cam plate that moves together with the first reflecting mirror 53 is M
Moving from SI, the front part of the primary charger 4 is turned on at 0M53, which activates Mg5°Mg6 but electrically cuts it, and further turns on the rear part of the primary charger at Mg4.

At the tilting and forward movement reversal position M82, the optical double clutch 303 is turned off, the optical forward clutch 302 is turned on,
At the same time as the movement of the optical system is reversed, the AC static eliminator 6 (FIG. 3, 08) is turned on. Again, Mg4. It operates in the order of Mg2, but is cut off in one phase. Ugly in the sails, Mg
5 to finish charging the primary band (inner part), then M
At g6, the primary charger (rear) finishes charging. Proceeding further, when the home position MSI trap of the optical system is reached again, the optical forward clutch is turned off, stopping the optical system and at the same time turning off the document illumination switch 52. J! From this point on, the timer starts working and after a certain period of time, the AC static electricity is removed Wh6.
turns off. When the screen drum reaches the home position, the screen drum motor 301 turns off and the insulated drum motor 328 turns on.
As is clear from the figure, the increase in salary formation is completed when the screen drum 211 rotates. In addition, external KJffi7 for this process
This is a safety feature installed in MB2 that will stop the machine if it overruns. The insulated drum motor 328 is a screen drum motor.
The screen drum and insulated drum, which rotate at about twice the speed of Because they are connected, both drums rotate at the same circumferential speed while the screen drum motor is driving, and when this is turned off,
When the motors for the insulated drums are turned on at the same time, the speed of both drums instantly increases to approximately twice that.

While the screen/drum motor 3010 is rotating, the front irradiation lamp 3. The entire II irradiation pump 7 is turned on and the optical cooling fan 326 is driven to prevent heat build-up in the optical system due to the irradiation of the document illumination lamp 52.

Also, at the same time as the r 5TART J key is activated, powder transfer charger 369 paper separation charger 37. Insulated drum static eliminator 5
0 and paper separation machine 319 (FIG. 3) are turned on and turned off at the end of the copying operation. However, the above-mentioned charging v! In b36s37e50, the peripheral speed of the screen drum motor and the rotational speed of the insulated drum are slow, so the extra charge is #! The potential is lowered so that no electric current is generated on the drum (Fig. 3, 317 = 318.321).

Next, after the primary latent flaw is formed, the screen drum motor is turned off and the insulating drum motor is turned on, resulting in a modulation.
After 0 modulation, when copying operations such as development, paper transfer, and separation start, one sheet of III zero is completed with three revolutions of the screen drum, but after that, one sheet is made every time it rotates. Copying is completed 0 Broom 3 To explain using Figure 3, first, the rotation of the drum is switched to the insulated drum motor 328, and at the same time, the force of the cleaning motor 320 is applied to the variable xmt charger 310 and the conveyor belt 38 (Figure 1). The conveyance row 2 clutch 316 for transmitting the information is turned on. As the rotation progresses and the screen drum advances from its home position 806, the modulation charger 311 for transferring the electrostatic latent image formed on the screen drum to the insulating drum is turned on, and the screen drum is turned on at 310°. The round paper feed roller clutch 314 that feeds one sheet of paper on the paper feed tray is turned on, and furthermore, at 350', the developing motor 312 is turned on.
Then, the reversible toner bridge prevention motor 313 for agitating the toner accumulated in the shoulder inertia is turned on.

After the screen drum starts modulating, it enters the 24th simultaneous rotation cycle and the paper feed roller clutch 3 starts at the %30@ position.
14 is turned off, which causes the tip of the paper to be sent and the IP
3. The timing roller clutch 315 is turned on in order to align the leading edge of the imaged image on the drum.
If the number of copies is 1, the 111th change m Teidenki 310° modulation charging 1) 311 will turn off at position 806, but in this case, since there are 2 copies, it will not turn off o Proceed further and 310
At °, the paper feed roller clutch 314 is turned on to feed the second sheet of paper. At 3606, the first timing roller clutch 315 is turned off. Entering the 34th rotation cycle, the paper feed roller clutch 314 is turned off at 30°, and the second timing roller clutch 315 is turned on.

Moe modulation charging at 80' 6310. The variable charger 311 is turned off. If you are copying one sheet, turn on the developing motor 31 here.
2 and the toner bridge prevention motor 313 is turned off.

At 360°, turn off the timing roller clutch again at 04104 to enter the 4th rotation cycle 6, at so' the developing motor 312 and toner bridge prevention motor 313
At 0360', the insulated drum motor 328 and the conveyance c1-2-clutch 316 are turned off, and the retention cycle is completed.

Separation claw that separates paper from the insulating drum)"329
(Fig. 1 73) shows that the tip of the paper is connected to the Lang device and the light receiving element 70 (
When all copying operations are completed, the electromagnetic brake 327 is activated for a certain period of time to stop the drum from overrunning. (Description of Sequence Control Circuit Configuration) FIG. 4 is a block diagram of the control IJ section. External signals come from the keyboard that issues operation commands.

A detection signal for the home position of the screen drum, which serves as a reference for getance, a signal from a pulse generator synchronized with the rotation of the insulating drum, and six micro switch signals that determine the timing of the next IW failure are centrally controlled. input to the department. The central control unit stores these input signals in two memories.

Making full use of the three counters, it makes memory 1 judgments and outputs the appropriate signals to the Inter/7-chair section.

The screen drum home position is detected by the detection pulse 330 (@3
331 is a 0 judgment pulse (1) obtained each time the screen drum rotates once by the magnet 68 and magnetoelectric transducer 67 (Fig. 1) on the screen drum. After the latent image formation is completed and the optical system returns to its home position M81, the screen drum's home position is subsequently obtained. At the generation time of this judgment pulse (1) 3310, the memory (
1) By determining whether 202 and screen drum counter 409 are equal and whether or not a 5TOP command is issued, the insulating drum motor is started to start the process of forming a secondary latent image, or to start the process of forming a second latent image. A decision is made whether to resume imaging or to stop the screen drum motor and end the sequence.

The above decision can be expressed in a flow chart as shown in diagram tR5. In other words, the above-determined female battle is next ■.

Indicated by ■, ■. Unfortunately, if we express this fup-chart as an electric circuit, it will look like @6 flash.0 If we define the vertical bus line as a column and the horizontal bus line as a line, then the control command indicated by the fifth evil ◇ is a column. 601 to 604, respectively.

Moreover, this signal is inverted by inverters 605 to 608,
Connected to columns 609-612. Line 613-6
17 is connected to a power supply through a resistor. This power supply must be at a level equal to the logic level @l".

For example, in the condition ◎ in FIG. 5, there is no r s'rop command, pilot lamp 1 is not lit, and memory 2 contains a numerical value. ”, so if we express this in a logical formula, @@ −FSTOP・FSω・IL−0”
become. Then, if we connect diodes to each of columns 609, 610, and 611 and 2-in 615 in the direction shown in the figure, we get
Only when an AND circuit is formed and columns 609, 610, and 611 are at 11" level, line 615 becomes @l# level. In other words, line 615 becomes @l# level when the condition ■ is satisfied.
For oIW1 where 5 becomes @11, the conditions ■ to ■ are output to lines 613 to 617. , furthermore, line 61
3-617 are inverted by inverters 618-622 and connected to lines 623-627. This line 623~
Columns 628 to 630 that intersect with 627 are connected to power supply E with a resistor.
When the diode matrix is again formed on ζζ, the condition of "0 or ■" is established on the line 630, and the output 644 of the inverter 633 becomes 10+@1 only at the 9th time. Therefore, this is the determination pulse (11F J 1) and the screen drum home position pulse DHP, which is the point in time, is passed through the gate 638 to separate the operation. If you do this, you can issue the operation command ■ to end the sequence and latch the memory circuit.In the same way, you can issue the command signals Φ and ■.In the case of the signal ■, the above-mentioned band rutter 36 The output of ゜37.50 is the second
It is lowered as shown in Figure 0. Now, the condition that becomes ■ is established.
When the signal is obtained, the screen drum motor is turned off, the insulated drum motor is rotated, the speed of the drum is changed in succession, and the disk 59 is rotated in synchronization with the drum by a gear. Then, a circular hole made on the circumference of the disk 59C passes through a gap between a pair of light emitting elements and a light receiving element 60, and a signal generated by this is extracted as a clock pulse 332 (FIG. 3). This clock pulse produces one pulse per 16 revolutions of the screen drum, or 360 pulses per revolution. It is difficult to drill one hole per 1' in a disk with the same diameter as the screen drum, so we installed a separate disk, used a gear to make the rotation of this disk n times that of the screen drum, and made a large number of disks. K is set to 1/n.

In the process after modulation in this device, this clock pulse is processed and used as a driving signal for the equipment.

That is, in the process after fX, as shown in Figure 3,
The first sheet @ is p, the edge drum completes one and a half revolutions, and 2
After the first copy, copies are made every half rotation, so sequence control! ! By setting the standard to half a rotation of the insulating drum and one rotation of the 10 screen drum, the cyclotsku pulse 332 is used, the binary coded 360-decimal counter is operated, and the control pulses 333 to 3450 shown in Fig. 3 are output. It is something.

FIG. 7 shows an example of a circuit for generating a control pulse. 7
Inherit 10 lip-flops to generate clock pulses from 0 to
Create a 360-decimal counter that counts up to 359.

The first four 7-lip props represent the ones digit, 0 to
A decimal counter that repeats counting up to 9, the next four 7-lips and 70-bits indicate the 10's digit, a decimal counter that repeats counting from 0 to 9, and the last two digits indicate the 100's digit. It is a ternary counter. However, when the count progresses from 0 and changes from 359 to 360, a reset signal is output from the decoder and all 7 lip-flops become 0.
be made into Thus, for each revolution of the screen drum, θ~
It becomes a 360-decimal counter that repeats counting up to 359. Control pulses 333 to 3450 in FIG. t143 are generated by decoding the output of the counter described above with the matrix circuit (decoder) in FIG. If it is desired to change the timing of the sequences 310 to 316 in FIG. 3, this can be done by arbitrarily changing the positions of the diodes of the decoder. For example, by combining a micro switch and a cam, it is possible to make delicate adjustments such as the timing of paper feed, which cannot be adjusted, and the registration between the leading edge of the paper and the image on the drum. .

Here, in the 11Jia diagram, for example, Moehen exchange charger 3
It turns on at 1 count of the 1st cycle of 10 digits, and if the number of copies is 1, it turns off at the 80 count of the 2nd cycle, and 2
In the case of 80 counts of the third cycle, it is necessary to select a control pulse in order to turn it off at the 80th count of the third cycle.

The present invention consists of two insulated drum counter ICs as shown in Figure 4.
, using the IC to count the wounds and compare the count value with the memory (fi) facilitates the selection. That is, from the second cycle the count @
A 1 m long 347 insulated drum counter is activated, and if the memory (2) for storing the desired number of copies and the counter value are equal, the on signal during that cycle is killed. After this, this counter will be stopped. However, for example, the tying roller clutch operates for the first time in the second cycle for the first sheet of paper. However, when comparing the insulating drum color/tar IC and the memory (2), in the third cycle of the counter Fi, it is already equal to the memory lz), so this clutch operation is not performed for the second sheet of paper. Therefore, the present invention controls the on/off of the clutch by comparing the memory (K) with an insulated drum counter IC that counts up one count later than the counter marked with #.

In the case of the insulated drum counter ICti in Fig. 3, it matches the memory (2,) in cycle #43 and stops counting, whereas the insulated drum counter IC' (i is IP
, matches memory (2) in 4 cycles.

Therefore, in the fourth cycle, the clear drum counter (1) and the clear drum counter (1) match. The coincidence of these two counters means that it is the final cycle of copying, and the two counters are cleared at the e-class time of that cycle, that is, the time of judgment pulse (2), and the screen drum counter and latent flaw formation are again cleared. It is checked whether the memory (1) storing the desired number of times matches, and if they match, a copy end command is issued and the rotation of the drum is stopped. If they do not match, as described above, turn off the insulating drum motor, surround the screen 7 and the drum motor, start exposure, and recall the same diatance after the next latent flaw formation. 310, 312, 314, and 315 are the paper feed roller clutch and pre-modulation charger in FIG. 3.

Current motor, timing roller clutch, 160
169 and 170 are flip-flop gates, 161, 164, 166 and 168 are inverters, 162 is a Nant gate, 163 is a NOR gate, and 165 and 167 are AND gates. When each matching circuit determines whether the counter IC matches the number setting memory (2) of the IC, the on-pulse is stopped, and the off-pulse stops the equipment. It's a turtle that can do it.

Next, the case where the transfer paper jams will be explained (see figure w48). In order to detect jams when paper is jammed in the conveyance path, when the transfer paper is not separated well and sticks to the insulated drum and moves, or when two sheets of paper are fed, the following is shown in Figure 1. In this step, a Yt source 69, a light receiving element 700, a source 71, and a light receiving element 72 are provided. When the leading edge of the paper leaves the light source 69 (S
GI), the light receiving element 70 picks up the pulse of the clock pulse generation delay, starts a jam counter, and when the leading edge of the paper connects the light source 71 (SGO), the output of this counter is decoded by the light receiving element 72. Make sure to output the confirmation detection pulse SDP. The count number of this detection pulse corresponds to the transport distance from the light source 69 to the light source 71. Therefore, if the paper gets jammed in the transport path and cannot be separated, a separation detection pulse is output. Despite this, one sheet of paper does not cover the light source 71.

Therefore, the jam signal JP is outputted by the color adding circuit shown in FIG. b.

In figure b, 81 is a gate and 82 is a flip-flop.

Also, using this counter, separate the separation claw 73 (@Figure 1)
The same decoder can output a pulse signal to create the timing to activate the decoder.

The sequence control unique to the present invention after detecting a jam will be briefly explained with reference to FIG. If a jam occurs, immediately stop the insulated drum motor using electromagnetic play mode and turn off all sequences, but do not turn off the power switch.
0 to enable repair and a counter display during repair Displays the count at the time of the hit Then, rotate the screen drum to its home position.Then, at the home position, turn off the screen drum motor and turn on the insulating drum motor. Since the electrostatic charge of the screen is maintained even during the jam repair, the sequence operation after the above-mentioned change is restarted.

The details of the timing are shown in Figure 9. In the sequence after modulation, the insulated drum requires one and a half rotations (three rotations of the screen drum) for the first sheet, so when the jam starts, Insulated drum counter ICI and I
The timing of the first sequence after modulation must not be created with C2 stopped. Therefore, as shown in FIG. 9, the prohibition time 1. A prohibition time 2 is created, and the sequence of the first sheet is controlled by this. Then, the insulated drum counters 1 and 2f) count up is performed from the beginning of the FiM3 cycle, and the subsequent sequence control is the same as normal control.0 The following cases can be considered as jams. ■１
When the first sheet jams, that is, insulated drum counter 1 (
IC) and 2 (IC') Φ message (2) jam, ■
IC-memory gull) time jam, ■IC'-memory (f
Jam when i).

Below is the counter movement of Jam Yuo's start. However, the memory shall be 4.

In the case of (2), both IC and IC' count up from the third cycle. In the case of (2), only IC is counted up in the third cycle, becomes IC-IC', and ends at the end of @3 cycle. In the case of (2), the count is not incremented even if v, the third cycle is entered, and IC-IC is checked at the end of the third cycle and the process ends. ■ and ■ end up in the same cycle, but this is because the paper jam occurred near the paper tip sprayer due to reasons such as ``2-sheet feeding'', and when the paper was jammed due to poor separation of the paper, etc. This is because the difference in time between paper jams can make a difference between ■ and ■ even when the paper is jammed.

A sequence control method using inhibit times 1 (INHI) and 2 (INH2) will be described. In the sequence of restarting the jam trowel, the first sheet must be copied in any case, so during the prohibition time l, 310 to 310 in Fig. 3 are copied.
The function of 314 is turned on with appropriate timing. 3
15 is also turned on at an appropriate timing between INHI and INH2. Next, at the time of KINHI/INH2, for 310 and 311, the counter IC and memory (1
If the contents of 1) are compared and they are already equal, it is turned off, and if 314 is equal to 5, it is not turned on.

As for the cycles after INH2, since the IC and IC' counters are controlled as described above, they are controlled by comparing the memory (2) with these two counters, as in the normal case.

The circuit that generates the stoppage time signals INHI and 2 is as shown in Figure 8a, where 181 and 182 are flip-flops, 183 and 184 are gates, and FR8TRT is a start signal for starting the 10j rotation of the insulating drum. The signal FJ is a judgment pulse (2), and the gates 183 and 184 output INHI and 2 at the timing shown in FIG. The driving of the equipment and the stopping of the counter during this prohibited time are controlled by a circuit as shown in FIG. On in figure.

The off pulse is the same as the sequence pulse in Figure @3.

The control of the sequence after latent flaw modulation described above will be explained in terms of the control of the -order me formation sequence, and will be based on the explanation in the previous section, in which a method similar to the judgment flow shown in Fig. 5 and the judgment circuit shown in Fig. 6 is used. As can be seen, each cycle after modulation corresponds to one cycle of the 360-decimal counter that counts clock pulses. Pulses 34 to 45 in Figure 3 occur at the appropriate number of counts in each cycle, but do not use all of them, but only in cycles where the conditions are right, and use the latching flip 70 of the related equipment. By turning on or off, it is possible to create a flow that loops the 360-decimal counter from θ to 359. An outline of this flow p- is shown in Fig. 1θ, and if this flow is represented by an electric path, it becomes as shown in Fig. 11. As described above, a flow in which a series of sequences based on this pulse count is programmed can be incorporated into a circuit having a diode matrix and an inverter consisting of two blocks. It becomes possible to control the sequence.

@10 and 11 In the figures, Set FHVT5 commands the pre-modulation band 1 to be turned on, Re5et FCl3 commands the drive of the paper feed roller to turn off, and Set FCl2 commands to turn on the drive of the tying roller. )'ioo is used to judge whether the copy start is started or not. The hollow space in FIG. 10 is also pressed in the same way as Fu p- at count 30, and the impact J! at the corresponding count is applied. ! It is possible to output an operation command for Iso n. Also, no. til'l! This is a book that allows you to create operating circuits for other devices just like Q.

Next, we will talk about the means for stably performing retention. As the number of retentions progresses, the electrostatic latent image formed on the screen will naturally discharge its charge and the potential will decrease, resulting in a developed title image. niI! It is affected by lightness, contrast, etc. Therefore, the present invention provides a method for correcting image changes caused by this potential drop. ! The potential of the lj charger is increased as the number of recharges increases. As shown in Figure 12, for the first go of this device, the potential of the first sheet is higher than that of the second and subsequent sheets, and after the seventh, the tenth sheet, and the third sheet.
0th picture, 50th picture.

Increasing the potential step by step on the 70th and 90th pictures 0 It is possible to raise and lower the potential by varying the primary input voltage of the high voltage transformer. are connected in series, and as the number of retention increases, the first rank is increased by sequentially short-circuiting this resistor using a moving relay or the like. These resistors may be placed in a straight line, or different resistance values may be connected in parallel and each of them may be switched.

The timing to activate the switches such as the above relays is the first
The formation of this tie 2 shown in FIG. 4 can be made by combining an insulated drum counter (1) and a modulated charger on-pulse. For example, the second piece of Kamoai percentage of this device is 10
The 30th one.

Since the potential changes at the 50th, 70th, and 90th sheets, as shown in Figure 15, the output of the #A class drum counter (1) is used to gate the modulation charger onno (Russ), which is the relay. It is a tie-up that activates the .Therefore, 2
The 1st sheet is IC-1, the 10th sheet is IC=9.30th sheet is FiI
c=29.50th sheet is IC-6.70th sheet is IC-6
The 9th and 90th sheets are clock pulse-S for IC-89.
6 on relay Kl- at O count! An activation pulse is output, setting latches 1 to 6 and activating coils 1 to 6 of the relay.

Next, a method of summarizing copying charges in a circular manner in the copying apparatus of the present invention will be explained. Light that exposes the original picture tpA F
The is-light source is used only during the process of latent flaw formation, and since the deterioration of the photoreceptor is generally caused by the passage of tube current through the photoreceptor.

Deterioration of the screen photoreceptor 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 apparatus, when accounting for copying fees, charges are charged differently depending on the size and quality of one copy sheet, as in conventional copying apparatuses. In addition, a totalization method is required that also takes into consideration the differences between the process of forming the primary latent on the autopsy screen photoreceptor and the subsequent process up to transfer to copy paper.An example of this is explained with reference to Figure 19. In Figure 0, 191 is a total counter that counts the number of electrostatic latent images formed on the screen photoreceptor; 192;
Counts the number of times a secondary latent image is formed on an insulating drum, possibly due to latent scratches on the screen drum, and the electrostatic charge is saved, and the friendship is transferred to copy paper. do(
(This corresponds to the number of copies made) Total counter, other numbers correspond to the numbers in Figure 2 (operation panel block diagram) 0 Explain its operation O Expose the original image, screen drum When the count-up switch 241 is turned on and off each time an electrostatic latent scratch is formed on the surface, the values of the counter 201 and the total color/reference 191 increase by one. The counter 201 is cleared when the apparatus repeats a series of copies and the content of the memory 202 matches the preset number of copies. However, the total counter 191 was not cleared and the next KN
<Counting continues even for copying operations. In other words, when the original picture is replaced and a new number of copies is set, the counter 201Fi will start from 1 again, 2, 3, etc.
However, the total counter 191 starts counting from the previous count value +1.

In addition, the count-up switch 242 for the process of secondary bone formation, primary bone formation, and transfer to KIN paper is turned on.
Each time the off is repeated, the counter 204 * ) - tall counter 192 is changed to the counter 201 marked with #
．． Perform the operation corresponding to the total counter 191,
The total counter 201 continues to count the total number of copy sheets that have been copied without having their contents cleared. In this way, the number of times electrostatic latent scratches are formed on the screen drum and the subsequent steps up to visible transfer to copy paper are counted separately, and each total counter is calculated separately when collecting copying fees. The fee will be charged.

As described above, by accounting for copying fees, when a large number of copies of the same original picture are produced, the unit price of each copy becomes cheaper as the number of copies increases. The above description has been made using a copying apparatus that transfers a visible image onto plain paper as an example. In addition, the so-called TESI method is used, in which the secondary image on the insulated drum is transferred directly onto plain paper, and this is then printed to form a copy. It is also effective in

[Brief explanation of drawings]

f! Figure g1 is a schematic sectional view of the copying apparatus according to the present invention;
The figure shows a drive circuit for a display in a copying machine according to the present invention;
'83 (a) and (b) are time charts of equipment operations in the copying apparatus according to the present invention, FIG. 4 is a block diagram of the control section of the copying apparatus according to the present invention, and FIG. Fig. 6 is an example of a circuit diagram that embodies this flowchart, Fig. 7 is a drive circuit diagram of each device, and Fig. 8 (a)
), (b) is a time chart and circuit diagram of jam detection operation, FIG. 9 is a time chart of 4-drive operation after jam detection, and FIG. 10 is a more detailed sequence judgment 7.
0-Chart, Figure 11 is an example of a circuit diagram that embodies it, Soul Figure 12, Figure 13! gl is a graph and circuit diagram for correcting image quality changes during retention copying, and Figure 14 is the first
Figure 15 is an example of the drive circuit in Figure 13, Figure 16 is an example of the device drive circuit in Figure vJ3, and Figure 17 is a cross-sectional view of the screen photoreceptor. 18
The figure shows an example of a prohibition time signal generation circuit in the event of a jam, and Figure 19 shows the following:
Figure 20 is an example of a charger output control circuit, Figure 21 is an example of a signal generation circuit for tR16 diagram using Figure 18, and 202 in Figure 4 is the memory of 1. ,
201 is a screen drum counter, 203 is a second memory, 413 is a first P31R drum counter, 414
is the second insulated drum counter. Hair continuation correction divination (method) 1. Display of the case 1982 Patent Application No. 211904 2, Name of the invention Image forming device 3, Person making the amendment Relationship to the case Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (too
) Canon Co., Ltd. Representative Ryu Kaku 3-4, Agent Address: 3-30-25 Shimomaruko, Ota-ku, Tokyo 146
Date of supplementary IF order: April 26, 1982 B (shipping date) 6 Specification and drawings subject to amendment 7 Supplementary + E details of contents S and drawings S (no change in contents). Procedural amendment (voluntary) December 9, 1980 Director General of the Patent Office Kazuo Wakasugi 1 Indication of the case 1981 Patent Application No. 211904 2,
Name of the invention Image forming device 3, relationship with the case of the person making the amendment Patent applicant Location Canon Co., Ltd., 3-30-2 Shimomaruko, Ota-ku, Tokyo (telephone 7)
58-2111) 5. Description subject to amendment 6. Yen depreciation of amendment (1) Claims of the specification are corrected as shown in the attached sheet =;
1 is known for sequence control. The applicant has proposed a system in which this pulse count is executed by a copy start command. In this case, for control in the second half of the cycle, the number of counts is extremely large (9), and there is a risk that an error may occur, or there is a risk that timing output may be performed even though the transfer material is not being fed for some reason. The present invention eliminates such inconveniences and improves the precision of sequence control.
Form a transfer image on the transfer material, separate the transfer material from the rotating body,
A process means (Fig. 1) for discharging the transfer material, a means (59° 60) for generating a series of pulses synchronous with the rotation of the rotary body, and a transfer material path before separating the transfer material. By counting the pulses, the operation of one of the process means is controlled (FIG. 6(b)) or the separation jam is detected (FIG. 8(b)). Patent (3) r409J on page 33, line 11 of the same patent is changed to "201
J is corrected, and after "Do it." on the first line of page 34, it says "Therefore, when inputting 5TOP, it is necessary to feed the first sheet. (4) "59" on page 36, line 13. Later, “(11th
Figure)” is added. (5) Add "This is inconvenient." before "Therefore," on the second line of page 41. (6) Take out "34-45" on the 11th line of page 50, add the dedicated memory j, and add "With this, you can avoid complicated configurations" after "aru" on the 3rd line of page 52. "Stable timing control is possible." is added. 2. Scope of claims

Claims (1)

[Claims] A key for setting the number of sheets, a display for displaying a numerical value, a memory for storing the number set by the key, a control means for displaying the number set by the key and performing an image forming operation,
The image forming apparatus M has a clear key for clearing the set number stored in the memory, and has a # feature of prohibiting the λ operation of the clear key when image formation is stopped.