JPS58179858A - Image forming device - Google Patents

Abstract

PURPOSE:To control image formation sequentially in accordance with a stable timing with simple constitution by deciding a condition signal at every timing signal in accordance with the prescribed count of pulse and reading out the program flow of an ROM. CONSTITUTION:A pulse generator 404 generates clock pulses in accordance with the optical detection of plural small through-holes formed on a disc turning in synchronization with an insulation drum to be formed thereon with a secondary latent image. The pulses are counted with the counter circuit of a CPU 401 and a timing signal is outputted. The judgement circuit of the CPU 401 judges the condition signal inputted thereto at every timing signal and reads out the program flow of the ROM and controls and mechanism part of an image forming device with an interface part 406 when the required conditions are established. Therefore, the image formation is controlled sequentially in accordance with the stable timing control with the simple constitution without the use of any switch or the like.

Description

[Detailed description of the invention] Examples will be described below with reference to the drawings.

FIG. 1 is a sectional view of the copying apparatus of the present invention, and the mechanical configuration thereof will be described below. The three-layered screen photoreceptor (FIG. 16) has a ring-shaped end, which is connected by a connecting band, and is attached to an integrated metal screen drum body using an adhesive or the like.

A screen drum 1 is installed on a tubular screen drum shaft 2. Also, in consideration of the application of bias voltage, screen drum 7 flanges made of an insulating material are fixedly attached to both ends of the screen drum 10 with screws, etc., and a modulation charger 11 is installed in front of the screen drum flange. Pre-modulation charger 13
It has an opening so that it can be installed inside the screen drum 1. The screen drum flange is 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 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 surface 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 10° to 40° from the viewpoint of dissolving power for copying.
0 mesh and an aperture ratio of 501 or more are suitable. The photoconductive member is made by vapor deposition of Se 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, silicone resin, etc. by spraying or vacuum deposition. Further, in order to make the conductive member exposed on one side, it is possible to coat the conductive member from one side and apply or spray the conductive member, and then grind the part that has gone around the conductive member.

The following devices necessary for forming an electrostatic latent image on the screen photoreceptor are arranged on the screen drum 10 times. A pre-irradiation lamp 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, during the formation of an electrostatic latent image on the screen photoreceptor, the front end may be charged again even though the electrostatic latent image has already been formed. Therefore 1
Next, the charger is divided into four chargers and the same voltage and current are applied to each with a time gap. The AC static eliminator 6 is provided to eliminate charges on the photoreceptor according to the optical image 5 of the original irradiated by the original irradiation lamp Sm. You may use a static eliminator0
The full surface exposure lamp 7 is used to enhance the contrast of the primary latent image on the screen photoreceptor. Further, in the vicinity of the screen drum 1, an insulating drum 8 having a conductive member coated with an insulating layer in the form of a thin film is arranged in parallel with a slight spacing therebetween. The screen drum 1 rotates in the direction of the arrow A, 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, which is located opposite to the screen drum 1 and close to the insulating drum 8 and 11, and a rail 12 coated on the insulating block 9. A pre-modulation charger 13 is attached to each.

In addition, dust adheres to the screen drum 1, causing the 1st latent and 2nd
In order not to interfere with the formation of the next latent image, floating dust is removed by the blower 14 and the advancing discharger 15 (back play of the discharger)
16, and the screen drum IK blows clear air through the dust removal nozzle 17.Also, if the screen photoreceptor is adversely affected by low temperature and high humidity, even if the air being blown is heated by the heat source 18. good. When a large number of secondary latent images are obtained from the primary latent image on the screen drum 1, the pre-modulation charger 13 applies a voltage of opposite polarity to that of the modulation charger 11 so that the potential of the primary latent image can be kept constant from beginning to end. It is there to apply.

The secondary latent image on the insulating drum 8 is developed by a developing device 20. The developing device 20 includes a toner replenishing device 22 and is separated from a developing device 24 by a partition plate 23, and the developing device 20 includes a toner replenishing device 22 and is separated from a developing device 24 by a partition plate 23.
5 is a developing device 2 due to the rotation of the toner distribution row 1-26.
Sent within 0.

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

The paper feed table 30 can load a large amount of copy paper (2,000 to 4,000 sheets), and the topmost position 31 of the copy paper is always at a constant position.1 The top position is detected, and the lift motor is activated to compensate for the amount of paper that has been reduced. is moved up along the guide rail 32 by the drive of the guide rail 32.

The copy paper is sent out from the top of the paper by a big up roller 33 so that it almost matches the image on the insulated drum B, and then by a timing roller 34, it is sent out to match the image on the insulated drum 8. transported to
The developed image on the insulating drum 8 is transferred to copy paper via the conveyance roller 35 and by the transfer charger 36. Furthermore, the separation charger 37 equalizes the attraction force between the insulating drum 8 and the copy paper,
A conveyor belt 8 having a built-in suction device 39 separates and conveys the copy paper from the insulating trim 8. transport bell) 38
F! Belt driven roller 40. The conveyor belt is stretched around rollers 41 and 42 and rotates as the rollers rotate, conveying the copy paper while sucking it.Furthermore, a conveyor belt stretched around rollers 43 and 44 sends the copy paper to a fixing roller 45. The powder image on the copy paper is then fused and fixed, and the copy paper is received by a tray 47 along a guide 46.

(Description of operation specifications of key operation panel) The operation of the copying apparatus of the present invention is performed by commands from the operation panel 61 shown in FIG. The operation panel 61 has two indicators 62
, 63.2 pilot lamps 65, 66 and a keyboard 64. key r on keyboard 64
OJ (0RIGINAL) is used to set the number of electrostatic waves formed on the screen drum 1, and if you press the numerical keys from "0" to "9" after this key, the contents pressed in sequence will be displayed. is entered on the display 62. or,
If the ``φ'' key is pressed after the numeric key is entered, the contents of the display 62 are cleared and the ``ω'' pilot lamp 65 is lit. On the other hand, when the numeric key is entered after the "■" pilot lamp is lit, the pilot lamp is turned off and a numeric value is entered on the display 62. 0, that is, numeric data, and the ``ω'' command are automatically switched. In addition, "ω" means the operation, rsTOP
The idea is to have them train endlessly until the J order (described later) comes.

Next, the key rRJ (RETENTION') is used to set the number of copies that can be repeatedly obtained by one electrostatic latent scratch formed on the surface IJ-7. The same is true for the key, and its contents are displayed on the display 63 or the pilot lamp 66. For example, the display 62 displays <123),
Key operation when entering <456> on the display 63: "0" → "1" → "2" → "3" → rRJ → r4J
→ “5” → “6”. Therefore, "0" to "9"
The numeric keys up to
Switch between keys rOJ and rRJ and display 62 on 27.
, 63° or pilot rung 65.66. 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, and is used to correct numerical data etc. entered incorrectly. Therefore, <123> appears on the display 62.
If you want to correct the entry entered as <456>, press the keys in the order of rcOJ → "0" → "4" → "5" → "6". rCRJ(CLEAR RETENTIO
The N ) key serves a similar purpose and clears the display 63 or pilot light 66.

The r 5TART J key is used to start the copying operation, but if the display 62, 63 and pilot lamp 65, 66 display an unreasonable combination, the r 5TART J key will not work. This is an unreasonable combination when the content of the Fi display 62 is <000> and when both the pilot lamps 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 1 at least once, and the reason for the latter is that it is impossible to copy without forming an electrostatic latent image on the screen drum 1 once. This is because it is impossible to perform an infinite number of retentions each time the image is formed.

Furthermore, once the r 5TART J key is activated and the copying machine starts operating, keys other than r 5TOP J will not operate due to a later-described inhibition circuit.

Also, if <002> is entered on the display 62 and <003> is entered on the display 63, after the primary hidden monk is formed on the screen drum,
By repeating modulation, development, and transfer, and repeating this cycle again, six copies are obtained. At this time, when the r5TART J key is activated, the two displays display <000>, and as the copying operation progresses, <ooi>(002>...) is displayed.

(Description of operation panel circuit configuration) FIG. 2 is a schematic diagram of the operation panel circuit according to the present invention. Memory 202. The counter 201 corresponds to the display 62 and stores and counts the number of electrostatic latent scratches formed on the screen drum. Memory 203. A counter 204 corresponds to the display 63 and is used to store and count the number of copies to be made for one primary latent scratch.

These counters 201, 204V! The screen drum counter and insulated drum counter described later can be used.

To explain the circuit operation, 217 to 221 refer to a group of keys on the operation panel, and the signals of these switches are gated by the output signal 214 of the inhibit circuit 216, and this signal 11214
Normally, it is at @1 level, but when the prohibition circuit 216 is activated, it becomes @0 level and will not be output even if the key group is operated. The inhibit circuit 216 is a flip-flop 209, 210°21
1 and two OR gates 222 and 223. The above flips and 70 knobs are each r 5TART j
The key was pressed, r S'1℃P" The key was pressed, 9 paper jams, 2 sheets feed, 9 paper whirl flop 209
and 210 are never set; if one is set, the other is reset. In other words, the 95TART instruction and the 5TOP instruction do not work at the same time. Also, flip
When the flop 211 is set, the flip is 70 and 20.
9°210 is always reset and all operations are interrupted when paper jams. OR game) The outputs of 222 and 223 are normally at the 11" and 'O' levels, respectively, but when any one of the 7 lip and 70 knobs 209, 210 and 211 is set, these become @0" and @l" levels. to be reversed. That is, when any one of the rsTARTJ key, r5TOP J key, or JAM detection is in operation, the inhibition circuit 216 is activated, and the signal line 214 is 10", the signal line 2 is
15 becomes @1”. Therefore, the key group 217 on the operation panel
, 218° 220.221 are inhibited, and at the same time 1 gate 225.226 is closed, 224, 227 is opened and the indicator 62. Memo 9-202. on the display 63. The contents of the memory 203 are replaced with the fukalanter 201 and the counter 204.
The contents are displayed.

During the copying operation, keys other than the r5TOP and J keys do not work. Therefore, the moment when the r5TART J key is activated, the counter is zero, so the display 62 is <002
>→<000>, 63 becomes <003>→<000>. However, as the copying operation progresses, this value is counted up, and when the corresponding memory value and the counter value become equal, the copying operation ends at 0.
When copying is completed, each counter is cleared to zero in preparation for the next operation, and the displays 62, 63 again display the numerical values in the memory.

When the 5TOP J key is pressed at any point during the copying operation, the operation ends at a well-defined point in the process from that point on.Next, the flip-flops 205 and 206 each
It remembers that the ``0'' key and the ``R'' key were pressed, and neither of these keys are set; if one is set,
Be sure to reset the other one. ○Now, when the "O" key is pressed, 7 lip/70 knob 205 is set, game) 228,
229 is opened, and then when any key in the numeric key group 217 is pressed, that numeric value is entered into the memory 202 through the gate 228. At this time, a slip is inserted that remembers that the "oo" key was pressed. - If the cipit lamp 234 is lit by the flop 207, it is reset by the signal line 232 and the lamp is turned off. Also, when the "■" key 221 is pressed instead of the numerical key group 217, the gate 229 is passed, the flip-flop 207 is set, and the pilot lamp 234 is lit.
If some numerical value is already stored in the memory 202K, clear it using the signal line 233. Therefore, the entry of a numerical value into memory and the "■" command cannot be satisfied at the same time; if one is true, the other is always not true.0 Furthermore, when the "R" key is pressed, the clip・70 Tsubu 2
05 is reset, flip-flop 206 is set, and gates 230 and 231 are opened. Below, the above rOJ
As in the case of the key, the value of the key group 217 is the gate 23
1 to the memory 203, the "cD" key passes through the gate 230, sets the flip 70 knob 208, and lights the pilot lamp 235. Also, if memory 203 is entered, flip frog 2
If you reset 08 and set it in reverse, memory 203
is cleared, so the entry of numerical data into memory and the "ω" command are automatically switched.

Also, one type of key group 21-7.221 allows two types of memory 202. Input can be entered into the memory 203.

(Relationship between sequence and machine operation) Fig. 3 is a time chart showing the operation sequence of the copying machine shown in Fig. 1.
< 0 0 2 >amixtON< o O
2> is the case. First, when the power switch is turned on, a glue IJ motor 320 is used to collect residual toner dropped from the insulated drum and to drive the conveyor belt. Screen dust collector 15 (Figure 1).

The screen dust prevention fan 14 (Fig. 1), the two screen heater birds 8 (Fig. 1), and the dust collecting fan 325 that sucks the toner floating in the dust container start driving.
It continues until the power switch is turned off. However, one screen heater is turned off when the first electrostatic submergence 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. To explain the mechanism of the optical system in FIG. 1, an original on an original glass is illuminated by an original illumination lamp 52,
The first reflecting mirror 53, which is installed integrally with the lamp reflecting mirror 2 and the lamp reflecting mirror, moves at a speed V that is synchronized with the circumferential speed of the screen drum 1. The light obtained by the illumination of the document illumination lamp passes through the first reflecting mirror 53°, the second reflecting mirror 54, and is supported by the lens nous and then passes through the nine lenses 55. Furthermore, a ninth third reflection mirror 56 is fixedly installed in the Luns House. Fourth reflection mirror 57
, and is projected onto the screen drum 1 via the fifth reflecting mirror 58. The second reflecting mirror 54
It moves in the same direction as the reflecting mirror 53. In this case, the cam plate attached to the first reflecting mirror mounting base on which the first reflecting mirror 53 is installed is sequentially connected to the micro switch (MSI~
The home position of the 0 optical system that moves while operating the M86) is at the MSI position, and now r 5T.
If the optical system is not in that position when the ART J key is activated, the optical forward clutch 302 (Fig. 3) is turned on, and the drive of the screen/drum motor 301 is transmitted to the optical system, and the screen/drum motor 301 is moved to its home position. Move to MSI and clutch 30
Turn off 2.

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, the force of the screen drum motor 301 is transmitted to the optical system, and movement begins. Also, at this time, the original illumination lamp 52 (304 in FIG. 3) is turned on. The cam plate that moves together with the first reflecting mirror 53 is MS
Moving from I, MSs.

The front part of the primary charger 4 is turned on by 0M53, which activates Mg2 but cuts it electrically, and the rear part of the primary charger 4 is further turned on by Mi4.

At the reversal position M82 of backward movement and forward movement, the optical backward movement clutch 303 is turned off, the optical forward movement clutch 302 is turned on,
At the same time as the movement of the optical system is reversed, the AC static eliminator 6 (308 in FIG. 3) is turned on. Again, Mg4. It operates in the same order as M83, but there is no electrical cut. Go further, Mg
5 to finish charging the primary charger (curved part), then Mg
Step 2 finishes charging the primary charger (rear). When the paper advances further and returns to the home position MSI of the optical system, the optical forward clutch is turned off, stopping the optical system and simultaneously turning off the document illumination lamp 52.Furthermore, at this point, the papermaking timer does not start working. After a certain period of time, the AC static eliminator 6 is turned off. Thereafter, when the screen drum comes to the home position, the screen drum motor 3'01 is turned off and the insulated drum motor 328 is turned on. Therefore, as is clear from the figure, latent flaw formation is completed after two revolutions of the screen drum. It should be noted that this process is provided with an external K[7°MS8, which is a safety feature that will stop the machine if it overruns. Insulated drum motor 32
8 rotates at about twice the speed of the screen drum motor 1.

The screen drum and the insulated drum are engaged with each other through gears, 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.
While the screen drum motor is in operation, it rotates at its circumferential speed, and when it is turned off and the insulated drum motor is turned on at the same time, the speed of both drums instantly increases to approximately twice that.

While the screen/drum motor 301 is rotating, the pre-irradiation 2 pumps 3. The entire surface irradiation lamp 7 is turned on, the original is illuminated, and the lamp 52 is irradiated.An optical cooling fan 326 for preventing heat from accumulating in the optical system is driven.

Also, at the same time as the r 5TART J key is activated, the powder image transfer charger 369 paper separation charger 37. Insulated drum static eliminator 5
0 and paper separation suction fan 319 (FIG. 3) are turned on and turned off at the end of the copying operation. However, since the above-mentioned charger 36 t 37 =50 has a peripheral speed of the screen drum motor and the rotation speed of the insulating drum is slow, the potential is lowered to prevent excess charge from being charged on the insulating drum (
317, 318, 321).

Next, after the primary latent image is formed, when the screen drum motor is turned off and the insulated drum motor is turned on, the modulation
Copying operations such as transfer and separation of the current paper start. After modulation, the first sheet of copying is completed after three revolutions of the screen drum, and thereafter one sheet of copying is completed every time the screen drum rotates once.

To explain using Figure 1g3, first, the rotation of the drum is switched to the insulated drum motor 328, and at the same time, the conveyance motor 328 is used to transmit the force of the cleaning motor 320 to the pre-modulation charger 310 and the conveyor belt 38 (Figure 1). Roller clutch 316 is turned on. As the rotation progresses and the screen drum advances 80 degrees from its home position, the modulation charger 311 for transferring the electrostatic latent image formed on one screen drum to the insulating drum is turned on, and the charger 310' At 350 degrees, the paper feed roller clutch 314 is turned on to feed one sheet of paper on the paper feed table, and at 350 degrees, the developing motor 312 is turned on.
Then, the reversible toner bridge prevention motor 313 for stirring the toner staying in the developing device is turned on.

After the screen drum starts modulation, it enters the second rotation cycle, and the paper feed roller clutch 31 starts at the 30° position.
4 is turned off, and thereby the timing roller clutch 315 is turned on in order to align the leading edge of the good paper fed out and the leading edge of the developed visible image on the insulating drum. Arrived,
If the number of copies is one, the charge modulation charger 31 is placed at the 80° position.
The 0° modulation charger 311 is turned off, but since there are two sheets in this case, it is not turned off.Proceeding further, the paper feed roller clutch 314 is turned on at 310° to feed the second sheet.

1st timing roller clutch 3 at 360°
Turn off 15. 31□ Enters the second rotation cycle, and at 300, the paper feed is low, low, and low.
The clutch 314 is turned off and the second timing roller clutch 315 is turned on at 080°, the modulation charger aio, and the modulation charger 311 is turned off at 0 or
If copying one sheet, the developing motor 312 and toner
Turn off the bridge prevention motor 313. At 3600, the timing roller clutch is turned off again at 044th rotation cycle, and at 80' the developing motor 312 and the toner bridge prevention motor 313 are turned off. 36
00, insulated drum motor 328 and conveyance roller
Clutch 316 is turned off, ending the retention cycle.

Separation pawl solenoid 329 (
73) in Fig. 1, the tip of the paper is the two lamps 69 and the light receiving element 70 (
1) by counting the pulses from the moment they pass between the positions shown in FIG. 3.

When all copying operations are completed, the electromagnetic brake 327 operates for a certain period of time to stop the drum from overrunning.

(Description of Geitance Control Circuit Configuration) FIG. 4 is a block diagram of the control section. External signals come from the keyboard that issues operation commands.

A detection signal for the home position of the screen drum that serves as the basis for the sequence, a signal from a pulse generator synchronized with the rotation of the insulating drum, and a signal that determines the timing of forming the next latent image 6
microbar switch signals are input to the central control unit. The central control unit stores these input signals in two memories.

By making full use of three counters, it performs memory 9 judgments and outputs appropriate signals to the interface section.

The screen drum home position is determined by detection pulse 330 (third
As shown in FIG. 1, the magnetic field is generated by the magnet 68 on the screen drum and the magnetoelectric transducer 67 (FIG. 1) each time the screen drum rotates once. Judgment pulse (1) 331 is obtained after the electrostatic latent scratch formation on the screen drum is completed and the optical system returns again to its home position MSl, followed by the home position of the screen drum. . The insulated drum motor is started by determining whether the spinning speed memory (1) 202 and the screen drum counter 409 are equal or not and whether the 5TOP command is issued at the time when this determination pulse (1) 331 occurs. A decision is made whether to begin the process of forming the second latent image, restart forming the second latent image, or stop the screen drum motor and end the sequence.

The above decisions can be expressed in a flow chart as shown in FIG. In other words, the above decisions are sequential ■.

■, Indicated by [stock]. Furthermore, when the flow chart of is expressed as an electric circuit, it becomes as shown in FIG.

If we define the vertical busbar columns and the horizontal busbars as lines, the control commands indicated by ◇ in FIG. 5 are connected to columns 601 to 604, respectively. Also, this signal tl converter 6o5~6
It is inverted at 08 and connected to collars A6Q9 to 612.

Lines 613-617 are connected to the power supply through resistors. This power supply must be at a level equal to logic level 11''.

For example, in the condition ◎ in FIG. 5, there is no r s'rop command, the pilot lamp l is not lit, and a numerical value is stored in memory 2. '', so if we express this in a logical formula, it becomes ``■-〒i陡F・FSω・IL-0''.So, ζ, each of the columns 609, 610, and 611 and the line 615 are arranged in the direction shown in the figure. When a diode is connected, s A
ND circuit is formed and columns 609, 610, 611
Line 615 becomes 11 rubles only when is @1 rubel. In other words, when the condition ■ is satisfied, line 615
becomes @1''.Similarly, the conditions from ■ to [phase] are output to lines 613 to 617. Furthermore, lines 613 to 617
617 is inverted by inverters 618-622 and connected to lines 623-627. This line 623-62
If the columns 628 to 630 that intersect with 7 are connected to the power supply EK with a resistor and a diode matrix is formed here again, the 2-in 630 becomes @0 level only when the condition "■ or ■" is satisfied.

The output 644 of the inverter 633 becomes 10+@1 according to the logical formula, and becomes 11 lbel only when the above-mentioned condition is satisfied. Therefore, by passing this discrimination pulse (1) F J 1 and the screen/drum home position pulse DHP, which is the separation point of the operation, through the gate 638, the operation command ``■'' to end the sequence is issued and the memory circuit is latched. I can do it. In the same way, when the command signals of ■ and ■ are issued, it becomes possible to do ^ In the case of the signal of
．． The output of 50 is lowered as shown in FIG. Now ■
When the following conditions are satisfied and the signal (2) is obtained, the screen drum motor is turned off, the insulated drum motor is rotated, the speed of the drum is switched to high speed, and the disk 59 is rotated in synchronization with the drum by the gear. A hole made on the circumference of the disk 59 passes through the gap between the pair of light emitting elements and the light receiving element 60, and the signal generated by the hole is passed through the gap between the pair of light emitting elements and the light receiving element 60.
It is taken out as a pulse 332 (FIG. 3). The clock pulses generate one pulse per ten revolutions of the screen drum, or 360 pulses per revolution. 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 a gear is used to make the rotation of this disk n times that of the screen drum. /n.

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

In other words, in the process after modulation, as shown in Figure 3,
The first copy is completed after one and a half revolutions of the insulated drum, and since the second copy is copied every half revolution, the sequence control standard is set to half a revolution of the insulated drum, or one revolution of the screen drum. In particular, by operating the binary coded 360-decimal counter based on the clock pulse 332, 3 in Fig.
33 to 345 control pulses are outputted.

An example of a circuit for generating this control pulse is shown in FIG. 7
Inherit 10 lip 70 tubes and set the clock pulse to 0~
Create a 360-decimal counter that counts up to 359.

The first four 7-lip-flops represent the ones digit and θ~
A decimal counter that repeats counting up to 9, the next four flip-flops indicate the tens digit, a decimal counter that repeats counting from 0 to 9, the last two digits indicate the 100 digit, and a ternary It is a counter. However, when the count progresses from 0 and changes from 359 to 360, a reset signal is output from the decoder and all flip-flops are set to 0.
be made into Thus, for each rotation of the screen drum, O~
It becomes a 360-decimal counter that repeats counting up to 359. Control pulses 333 to 345 in FIG. 3 are generated by decoding the output of the counter with the matrix circuit (decoder) in FIG. 7. In addition, 3 in Figure 3
If you want to change the timing of the sequences 10 to 316, you can do so by arbitrarily changing the position of the diode in the decoder. For example, it is possible to easily make delicate adjustments such as the timing of paper feeding, which cannot be adjusted using a combination of a micro switch and a cam, and the registration between the leading edge of the paper and the exposed image on the drum.

Here, in FIG. 3, for example, the pre-modulation charger 310 is turned on at 1 count in the first cycle, and if the number of copies is 1, it is turned off at 80 counts in the second cycle, and if the number of copies is 2, then Control pulse selection is required to turn off at count 80 of the third cycle.

The present invention has two insulated drum counters I as shown in FIG.
This book makes the selection easy by counting the discrimination pulse (2) using C, IC and comparing the count value with the memory (2). That is, it disturbs the 347 insulated drum counter IC which counts @11 from the second cycle, and kills the ON signal during that cycle if the memory (2) that stores the desired number of copies and the counter value are equal. After 0, this counter is stopped. However, for example, the timing roller clutch operates for the first time in the second cycle for the first sheet of paper. However, if we compare the insulated drum counter IC and the memory (2), the said counter will already be equal to the memory (2) in the third cycle, so the operation of this clutch for the second sheet of paper will not take place. The present invention controls the on/off of the clutch by comparing the memory (2) with an insulated drum counter IC' that counts up one count later than the counter.

In the case of Figure 3, the insulated drum counter IC matches the memory (2) in the 3rd cycle and stops counting, whereas the insulated drum counter IC' (2) matches the memory (2) in the 4th cycle. matches.

Therefore, in the fourth cycle, the insulating drum counters (1) and (2) match. The coincidence of these two counters means that it is the last cycle of copying, and at the last time of the cycle, that is, the time of judgment no. It is checked whether the memory (1) storing the desired number of times of formation 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, the insulating drum motor is turned off, the screen drum motor is rotated, exposure is started, and the same sequence after forming the second latent flaw is repeated. FIG. 16 shows an example of drive control of each device, and 310, 312, 314, and 315 are the paper feed roller clutch and pre-modulation charger in FIG. 3.

Developing motor, timing roller clutch, 160
169, 170 are flip-flop gates, 161, 164, 166, 168 are inverters, 162 is a Nant gate, 163 is a NOR gate, and 165, 167 are AND gates. When judged by the front r counter IC, the on-pulse is stopped, the off-pulse is used, and the equipment is stopped, and the equipment can be controlled at a predetermined timing.

Next, the case where the transfer paper jams will be explained with reference to FIG.

In order to detect jams when paper is jammed in the conveyance path, when the paper does not separate properly after transfer and sticks to the insulated drum and moves, or when two sheets of paper are fed, the following is shown in Figure 1. At the light source 69 and the light receiving element 70. When the leading edge of the paper provided with the light source 71 and the light receiving element 72 emits the light source 69 (SGI
), the light-receiving element 70 picks up the pulses of the clock pulse generator, starts a jam counter, and when the leading edge of the paper traces back the light source 71 (8GO), the light-receiving element 72 decodes the output of this counter for separation confirmation detection. A pulse SDP is emitted.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 becomes jammed in the conveyance path and cannot be separated, the paper will not pass the light source 71 even though the separation detection pulse is output.

Therefore, a jam signal JP is generated in a circuit as shown in FIG. b.

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

Also, using this counter, separate the separation claw 73 (Figure A1)
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 explained with reference to FIG. If a jam occurs, immediately stop the insulated drum motor suddenly using the electromagnetic brake and turn off all sequences, but do not turn off the power switch.
Allows for repairs. The repair counter display remains at 11, which is the number counted at the time of the jam. When the repair is complete, press the r 5TART J key again and the screen drum motor will rotate, rotating the screen drum to its home position. Then, at the home position, the screen drum motor is turned off and the insulating drum motor is turned on. Since the electrostatic latent scratches on the screen are retained even during 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 modulation, the insulated drum requires one and a half revolutions (three revolutions of the screen drum) for the first sheet, so in the case of restarting after a jam, , insulated drum counter ICI and I
It is necessary to create the timing for the first sequence after modulation while keeping C2 stopped. For this purpose, as shown in FIG. 9, a prohibition time 1 and a prohibition time 2 are created in the first cycle and the second cycle of the sequence, and the sequence of one sheet [ ] is controlled based on this. The insulated drum counters 1 and 2 are counted up from the beginning of the third cycle, and the subsequent sequence control is the same as normal control.

The following cases can be considered as jams. ■１
Insulated drum collar: yp-1 when the first sheet jams
(IC) and 2 (IC') + Jam when memory (2), ■ Jam when IC = memory (2), ■ Jam when IC' = memory (2).

The counter movement for restarting after a jam is shown below. However, it is assumed that memory (2)=4.

In case (2), both IC and IC' count up from the third cycle. In case (2), only IC' is counted up in the third cycle, IC=IC', and the process ends at the end of the third cycle. In the case of ■, even if it enters the third cycle, it does not count up, and at the end of the third cycle, I
Confirm C-IC' and end. ■ and ■ end in the same cycle in terms of results, but this is because the jam occurs near the paper leading edge detector due to "@2-sheet feeding", or due to poor paper separation, 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.

We will explain how to control the sequence using inhibit times 1 (INHI) and 2 (INT (2). In the sequence to restart after a jam, the first sheet must be copied in any case, so it is prohibited. At time 1, 310 in Figure 3
The functions of ~314 are turned on at appropriate timings.

315 is also turned on at the appropriate timing of INHI and INH2. Next, at the time of j'N1[]-INH2, counter IC and memo' are used for 310 and 311.
)-(2) and if they are already equal, they are turned off, and if they are equal, they are 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 above-mentioned inhibition time signals INH1 and INH2 is as shown in FIG. FJ is the judgment pulse (2) and the gate is +83. At t84, INHI, 2 is output at the timing shown in Figure 9.During this prohibition time, the device is driven and the counter is stopped by the fourth
It is controlled by the circuit shown in the figure. On in figure.

The off pulse is the same as the sequence pulse in FIG.

The control of the sequence after the above-mentioned latency modulation uses the same method as the judgment flow shown in FIG. 5 and the judgment circuit shown in FIG. As is clear from the foregoing description, each cycle after modulation corresponds to one cycle of the 360-decimal counter that counts clock pulses. Pulses 34 to 45 in Figure 3 are generated at the appropriate number of counts in each cycle, but rather than using all of them, they are used only in cycles where the conditions are met, and the latching flip-flops of the related equipment are used. By turning it on or off, you can create a flow that loops the 360-decimal counter from 0 to 359. An outline of this flow is shown in Fig. 10, and if this flow is further represented by an electric circuit,
It will look like Figure 11. As described above, the flow in which a series of sequences based on this pulse count is programmed can be incorporated into a circuit with a diode matrix and an inverter consisting of two blocks, and therefore, without using any switches. It becomes possible to control the sequence.

In Figure 10.11, Set FHVT5 turns on the pre-modulation charger, Re5et FCL3 turns off the drive of the paper feed roller, Set FCL4 turns on the drive of the timing roller, and FR8TRT turns on the copy start after modulation. FI■ is for determining whether there is multi-retention or not. The blank space in FIG. 10 can also be used to output operating commands for the necessary equipment during the body hit count in the same manner as the flow at count 30. Further, as shown in FIG. 11, operating circuits for other equipment can also be formed.

Next, we will discuss 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 microscopic image. It affects the shading, contrast, etc. Therefore, in the present invention, as a ninth step to correct the change in the image due to the decrease in the potential, the potential of the modulation charger is increased as the number of retentions progresses. In the case of this device, as shown in Figure 12, the potential of the first sheet is set higher than that of the second and subsequent sheets, and then the 10th sheet, the 30th sheet, and so on.
50th photo.

Raising the potential step by step at the 70th and 90th panels 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 potential is increased by sequentially shorting these resistors using a moving relay or the like. 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 to activate the switches such as the above relays is the first
This is shown in Figure 4. This timing can be created by combining an insulated drum counter (1) and a modulated charger on-pulse. For example, in the case of this device, the 2nd, 10th, and 30th images.

Since the potential changes at the 50th, 70th, and 90th sheets, as shown in Figure 15, the timing at which the modulated charger on pulse is gated by the decoded output of the insulated drum counter (1) activates the relay. becomes. Therefore, the 2nd sheet is I C = 1, the 10th sheet is IC = 9.30th sheet is I
C = 29. The 50th sheet is IC = 49. The 70th sheet is IC = 6
9. The 90th sheet is the clock pulse when IC = 89 = (
(Main) When counting, an operating pulse of 1 to 6t is output to the relay, setting latches 1 to 6 and activating the coils of 1 to 6 in the relay.

Next, a reasonable method of totaling copying fees in the copying apparatus of the present invention will be explained. The light source that exposes the original image is used only during the latent image formation process, and photoreceptor deterioration is generally caused by the passage of current through the photoreceptor.

The deterioration of the screen photoreceptor mainly occurs during the step of forming the electrostatic latent layer, 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 copying paper, as in conventional copying apparatuses. In addition, a total method is required that takes into consideration the differences between the process of forming the primary latent layer on the screen photoreceptor and the subsequent process of transferring it to copy paper. An example of this will be explained based on FIG. 19, in which 191 is a total counter that counts the number of electrostatic charges formed on the screen photoreceptor;
Counts the number of times a second latent image is formed on an insulating drum from a second latent image on a screen drum, the electrostatic latent image is developed, and the developed image is transferred to copy paper. do(
This corresponds to the number of sheets of copy paper that has been copied), and the other numbers correspond to the numbers in FIG. 2 (operation panel block diagram). Let's explain its operation.

When the count-up switch 241 is repeatedly turned on and off each time the original image is exposed and an electrostatic latent image is formed on the screen drum, the values of the counter 201 and the total counter 191 increase by one. The counter 201 is cleared when the apparatus repeats a series of copying operations and the content of the memory 202 matches the preset number of copies. However, the total counter 191 continues to count even for the next copying operation without being cleared. In other words, when the original picture is replaced and a new number of copies is set, the counter 201 starts counting again from 1, 2, 3, etc., but the total counter 191 starts counting from the previous count value + 1. start.

In addition, secondary latent scratches are formed, then developed, and then transferred to copy paper.
Each time the count-up switch 242 of the cooling process is turned on and off, the counter 204. Total counter 192Fi, respectively the above counter 201
．． ) - performs the operation corresponding to the tall 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 an electrostatic latent image is formed on the screen drum and the subsequent steps up to the transfer of the visible image to the copy paper are counted separately, and each total counter is calculated when collecting the copying fee. Separate charges will be charged. As described above, by accounting for copying fees, when multiple copies of the same original painting are made, the unit price of copies becomes cheaper as the number of copies increases, and the L9 accounting system takes advantage of the features of the present invention. is achieved.

The above description has been made using a copying apparatus that transfers a visible image onto plain paper as an example. However, the present invention directly transfers nine latent images formed on a photoconductor by exposure to light onto plain paper, and develops the nine latent images to produce a copy. It is also effective for books that use the so-called TESI method, and for those that directly transfer a secondary latent image on an insulated drum onto plain paper and develop it to make a copy. .

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a copying apparatus according to the present invention, FIG. 2 is a drive circuit for a display in the copying apparatus according to the present invention, and FIG.
Figures (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. The chart, Figure 6 is an example of a circuit diagram that embodies it, Figure 7 is a drive circuit diagram of each device, and Figures 8 (a) and (b).
) is a time chart and circuit diagram of jam detection operation, Fig. 9 is a time chart of equipment operation after jam detection, Fig. 10 is a flowchart of more detailed sequence judgment, and Fig. 11 is a concrete example of it. An example of a circuit diagram, Fig. 12,
Figure 13 is a graph and circuit diagram for correcting image quality changes during retention copying, Figure 14 is a time chart of the operation in Figure 13, Figure 15 is an example of the drive circuit in Figure 13, and Figure 16 is
The figure shows an example of the drive circuit for the device in Fig. 3, and Fig. 17 shows an example of the drive circuit for the device in Fig. 3.
18 is an example of a prohibition time signal generation circuit in the event of a jam; FIG. 19 is a schematic diagram of the accounting system;
0 is an example of a charger output control circuit, and FIG. 21 is an example of a signal generation circuit for FIG. 16 using FIG. 18. In FIG. 4, 202 is a first memory, and 2n1 is a screen drum counter. , 203 is a second memory, 413 is a first insulated drum counter, and 414 is a second insulated drum counter. T. Continued Amendment (Method) Kazuo Wakasugi, Commissioner of the Japan Patent Office 1. Indication of the case Patent Application No. 211902 of 1982 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 (+00
) Canon Co., Ltd. Representative Ryu Kaku 3 Department 4, Agent Notification Office 3-30-2 Shimomaru Ryo, Ota-ku, Tokyo 146 April 1982 2 Eil-J (Date of shipment) 6 Statement subject to amendment and drawing 7, detailed description of the amendment and engraving of the drawings (no change in content). Procedural Amendment (Voluntary) December 1982 298 1 Indication of Case 1982 Special Request No. 211902 2,
Name of the invention Image forming device 3, relationship with the case of the person making the amendment Patent applicant's office 3-30-2 Shimomaruko, Ota-ku, Tokyo Name (100) Canon Co., Ltd. Representative Ryu Kaku Part 3 Part 5 Specification subject to amendment' 6. Details of the amendment (1) The scope of claims in the specification has been corrected as shown in the appendix [Conventionally, copying machines and the like have been known to control the sequence of image formation by counting a predetermined number of pulses. However, even if a predetermined number of outputs are counted, not all outputs may be necessary for control. The present invention executes appropriate control according to the count result with a simple configuration, and includes a process means for forming an image (Fig. 1) and a means for generating a series of pulses (59, 6).
0), means for counting said pulses for sequentially controlling said process means (fiR4, Figure 7);
A read-only memory (FIG. 11) stores a program (FIG. 10) for controlling the process means according to the condition signal, and the condition signal is determined by the counting means memory and a predetermined process is executed based on the result. It is characterized in that it is configured to select and control the means. (3) Replace r409J on page 33, line 11 with “201”
and added “Do.” in the first line of page 34. (4) After “59” on page 36, line 13, “(11th
Figure)” is added. (5) Add "This is inconvenient." before "Therefore," on the second line of page 41. (6) M$50i, line 11, r34-45 ``Memory only for outputting 1'' was added, and after ``Yes'' in the 3rd line of page 52, ``This allows for a stable configuration without requiring a complicated configuration. Timing control is possible.'' is added. 2. Claim forming device.

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, and a setting stored in the memory. An image forming apparatus comprising a clear key for clearing a number, and inhibiting an input operation of the clear key in response to an image forming start key.