JPS5911904B2 - image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus capable of forming a set number of images.

An example of using a ticker and memory instead of a mechanical selector to set the number of copies can be considered.

In this case, a clear key is provided for correcting the set number.
However, since the clear key for correction is activated by a light touch, when image formation is interrupted due to a device problem, it is possible to touch the clear key by mistake while performing trouble recovery work during a mid-stop stop before image formation is complete. A clear input operation may be performed.

As a result, the number of settings stored in the memory by the operation of the ticker may be cleared by the operation of the clear key when a device trouble occurs. The present invention has been made in view of the above points, and includes a setting key for setting the number of sheets,
A display that displays numerical values, a memory that stores the number of settings made by the setting keys, a clear key that clears the number of settings stored in the memory, and images for the number of settings stored in the memory. It has an image forming means for performing a forming operation, a control means for displaying the set number on the display and executing the image forming operation, and a means for prohibiting clear input of the set number in the memory using the clear key in the event of an apparatus trouble. death,
This prevents the operator from inadvertently operating the clear key and clearing the set number during a mid-stop in the event of equipment trouble, and from causing the initial set number to become unknown or resetting the number using the setting key. It is possible to effectively eliminate the inconveniences such as having to do so.

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 ring-shaped ends, which are connected by a connecting band and stretched with adhesive or the like to an integrated metal screen drum base. It is installed on the screen drum shaft 2.
In addition, screen drum flanges made of insulating material are fixed with screws or the like at both ends of the screen drum 1 in consideration of the application of bias voltage, etc., and a pre-modulation charger 13 is installed in front of the screen drum flange. It has an opening so that it can be installed inside the screen drum 1. The screen drum flange is connected via ball bearings.
It is installed on a fixed tubular screen drum shaft 2. The screen drum 1 is rotatable around a fixed screen drum shaft 2. The screen photoreceptor of the screen drum 1 is constructed by laminating a photoconductive member 71 and an insulating member 72 on a conductive member 70 having a large number of fine holes so that one surface of the conductive member is exposed.

The conductive member is made by threading thin metal wires such as stainless steel or nickel into a net shape. The mesh value of the conductive member is suitably 100 to 400 mesh from the viewpoint of resolving power for copying, and one that can ensure an aperture ratio of 50% or more. The photoconductive member is prepared by vapor deposition of Se alloy, spray coating with an insulating resin dispersion containing particles of CdS, PbO, etc., etching, and the like. 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 by coating or spraying, or by grinding the member that has gone around the conductive member. The following two devices necessary for forming an electrostatic latent image on the screen photoreceptor are arranged around the screen drum 1.

A pre-irradiation lamp 3 is provided to eliminate undesirable ghosts on the screen photoreceptor, and a primary charger 4 applies a uniform static 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 of the image may be charged again even though the electrostatic latent image has already been formed. Therefore, the primary charger 4 is divided into two parts, and the same voltage and current are applied to each part with a time gap between them. The AC static eliminator 6 is provided to remove the electric charge on the photoreceptor according to the light image 5 of the original irradiated by the original irradiation lamp S2. Further, instead of the AC static eliminator, a DC static eliminator having a polarity opposite to that of the primary charger may be used. The full surface exposure lamp 7 is used to enhance the contrast of the primary latent image on the screen photoreceptor. In addition, an insulating drum 8, which has a conductive member coated with an insulating layer in the form of a thin film, is arranged adjacent to the screen drum 1 with a small distance 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. screen drum 1
Inside the screen drum 1, a modulation charger 11 is mounted on a rail 10 supported on an insulating block 9 at a position closest to the insulating drum 8, and a modulating charger 11 is mounted on a rail 12 supported on the insulating block 9. A pre-modulation charger 13 is attached to each. In addition, in order to prevent dust from adhering to the screen drum 1 and hindering the formation of the primary latent image and the secondary latent image, the air blower 14 and the discharging device 15 in the middle remove the floating dust from the back plate 16 of the discharging device. clear air is blown onto the screen drum 1 from the dust removal nozzle 17.

Further, if the screen photoreceptor is adversely affected by low temperature and high humidity, the air being blown may be heated by the heat source 18. The pre-modulation charger 13 is connected to the 1 on the screen drum 1.
When obtaining a large number of secondary latent images, the modulation charger 11 applies a voltage with a polarity opposite to that of the modulation charger 11 so that the potential of the primary latent image can be kept constant from beginning to end. 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 section 24 by a partition plate 23 , and developing toner 25 is sent into the developing device 20 by rotation of a toner distribution roller 26 . The developing toner 25 is sufficiently stirred by the rotation of the stirring roller 27, and the electrostatic latent image on the insulating drum 8 is developed by a sleeve 29 containing a magnet 28. The paper feed tray 30 can load a large amount of copy paper (2,000 to 4,000 sheets), and so that the topmost copy paper 31 is always at a constant position, the top position is detected and the lift motor is activated to compensate for the amount of paper that has been reduced. The earth is raised along the guide rail 32 by the drive of the .

The copy paper is fed out from the topmost layer of the paper by a pick-up roller 33 so as to almost match the visible image on the insulated drum 8, and then by a timing roller 34, the printed image on the insulated drum 8 is fed out. transported to match the
The developed image on the insulating drum 8 is transferred onto copy paper via a conveyance roller 35 and a transfer charger 36 .

Further, the separation charger 37 weakens the attraction force between the insulating drum 8 and the copy paper, and the copy paper is separated from the insulated drum 8 and transported by the conveyor belt 8 having a suction device 39 built therein. The conveyor belt 38 includes a belt drive roller 40, rollers 41, 4
The belt 2 is stretched around rollers 43 and 44, rotates as the rollers rotate, and conveys the copy paper while sucking it.Furthermore, a conveyor belt stretched between 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 includes two displays 62 and 63, two pilot lamps 65 and 66, and a keyboard 64. The key “O” (0RIGINAL) on the keyboard 64
) is used when setting the number of electrostatic latent images to be formed on the screen drum 1. Following this key, keys [0] to "
If you press the numerical keys up to ``9'', the contents pressed in sequence will be displayed on the display 6.
The entry is made in 2. If the ``ω'' key is pressed after the numeric key is entered, the contents of the display 62 are cleared and the ``x'' pilot lamp 65 is lit. Conversely, after the "1" pilot lamp lights up, if you press the numeric key to the first entry, the pilot lamp will go out.
A numerical value is entered on the display 62. That is, the numerical data and the "1" command are automatically switched. In addition, “00
] is to cause the operation to continue indefinitely until a "STOP" command (described later) is received. Next, key “R” (RET
ENTION) is used to set the number of copies that can be repeatedly obtained by one electrostatic latent image formed on the screen, and entry 1 of the numeric key or "1" key is "
0" key, and its contents are displayed on the display 63 or pilot lamp 66. For example, when entering the display 62 123〉 and the display 63 456〉, the key operation is ``0'' → ``1'' → ``2'' → ``3''.
” → [R] → “4” → “5” → “6”. Therefore, the numeric keys from [0] to "9" and the "1" key are switched between the two function keys [0] and [R].
indicators 62, 63 or pilot lamps 65, 6
6 can be entered arbitrarily. Of course "O" key and "R"
It doesn't matter which key is specified first. Next, “C
"O" (CLEARORIGINAL) key is displayed on the display 62.
Or there is to clear pilot lamp 65,
It is used to correct numerical data etc. entered incorrectly.

Therefore, if you want to correct the entry 123〉 on the display 62 to 456〉, change "CO" → "O" → "
Just press the keys in the order of ``4'' → ``5'' → ``6''. “CR
A CLEAR RETENTION key serves a similar purpose and clears the display 63 or pilot lamp 66. The "START" key is used to start the copying operation, but if the contents displayed on the displays 62, 63 and the pilot lamps 65, 66 are in an unreasonable combination, the "START" key will not work.

The unreasonable combination is when the content of the display 62 is 000> and when both the pilot lamps 65 and 66 are lit.

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 make a 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. Furthermore, once the "START" key is activated and the copying machine starts operating, keys other than "STOP" will not operate due to a prohibition circuit which will be described later.

In addition, when the entry is made to <002> and <003> on the display 62 and 63, after the primary latent image is formed on the screen drum,
By repeating modulation, development, and transfer three times, and repeating this cycle again, six copies are obtained.

At this time, when the "START" key is operated, the above two indicators display "000", and as the copying operation progresses, "001>", "002", etc. are displayed. (
Description of Operation Panel Circuit Configuration) FIG. 2 is a block diagram of the operation panel circuit according to the present invention.

A memory 202 and a counter 201 correspond to the display 62 and are used to store and count the number of electrostatic latent images formed on the screen drum. A memory 203 and a counter 204 correspond to the display 63, and are used to store and count the number of copies to be made by one primary latent image. 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 operation panel, and the signals of these switches are the output signal 2 of the prohibition circuit 216.
14, and this signal line 214 is normally gated at 61
It is at level 1, but when the prohibition circuit 216 is activated, it becomes level 00 and there is no output even if the key group is operated.Prohibition circuit 2
16 is flip-flop 209, 210, 211 and 2
It is composed of two OR gates 222 and 223. Each of the flip-flops remembers that the "START" key has been pressed, that the "STOP" key has been pressed, and that there has been a jam such as a paper jam, feeding two sheets of paper, or poor paper separation. Both flip-flops 209 and 210 are never set, and when one is set, the other is set. In other words, the START command and STOP command never work at the same time. Also, when flip-flop 211 is set, flip-flops 209 and 210 always reset, interrupting all operations when the paper jams. OR
The outputs of gates 222 and 223 are normally 61-6, respectively.
Although it is at the 01 level, Fritub Frotub 209, 21
If either one of 0,211 is set, these become 60
-6" level. In other words, when any one of the "START" key, "STOP" key, or JAM detection is in operation, the prohibition circuit 216 is activated, and the signal line 214 is switched to the 10-signal line 215. becomes "1". Therefore, at the same time the keys 217, 218, 220, 221 on the operation panel are disabled, the gates 225, 226 are closed, and the keys 224, 22 are disabled.
7 opens and the contents of the counter 201 and counter 204 are displayed on the display 62 and 63, replacing the contents of the memory 202 and memory 203. During the copying operation, keys other than the "STOP" key do not work. Therefore, “S
At the moment when the "TART" key is activated, the count is still zero, so the display 62 shows 002〉゛→ku000>, and 63 shows 003〉→ku000>. However, as the copying operation progresses, this number is counted up, and when the number in each corresponding memory becomes equal to the number on the counter, the copying operation ends. When copying is completed, each count is cleared to zero in preparation for the next operation, and the displays 62 and 63 display the numerical values in the memory again. [ST
When the "OP" key is pressed at any point during the copying operation, the operation is terminated at a well-defined point in the process from that point.

Next, the flip-flops 205 and 206 are
It remembers that the ``0'' key and the ``R'' key were pressed, and neither of them is set; if one is set,
Be sure to reset the other one.

Now, when the "O" key is pressed, the flip flop 205
is set, gates 228 and 229 open, and then when any key in the numeric key group 217 is pressed, gate 2 opens.
28 and the numerical value is stored in memory 202. At this time, if the repilot lamp 234 is lit by the flip-flop 207 which remembers that the "1" key has been pressed, it is reset by the signal line 232 and the lamp is turned off. Also, when the "1" key 221 is pressed instead of the numeric key group 217, it passes through the gate 229 and flips.
Set the flop 207 and turn on the pilot lamp 23.
At the same time as 4 is turned on, if some numerical value is already stored in the memory 202, it is cleared through the signal line 233. Therefore, the entry of a numerical value into the memory and the "1" command are never satisfied at the same time; if one is true, the other is always not true. Furthermore, when the "R" key is pressed, flip-flop 205 is reset, flip-flop 206 is set, and gate 230 is set.
, 231 opens.

Hereinafter, as in the case of the above-mentioned [0] key, the key group 217
The numerical value passes through the gate 231 and enters the memory 203.
1" key passes through gate 230 and flips flop 20.
8 and turn on the pilot lamp 235. Again, when memory 203 is entered, flip-flop 208 is reset, and vice versa when set, memory 203 is cleared, so the entry of numeric data into memory and the [oo] instruction are automatically performed. Can be switched. Also, by one type of key group 217, 221, 2
Inputs can be entered into the seed memory 202 and 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.
This is the case of RETENTION 002>.

First, when the power switch is turned on, a cleaning motor 320 for collecting residual toner dropped from an insulated drum and for driving a conveyor belt, a screen dust collector 15 (Fig. 1), and a screen dust-proof fan 14 (first (Fig. 1), the two screen heaters 18 (Fig. 1) and the developing dust collecting fan 325 which sucks the toner floating in the developing device start driving and continue until the power switch is turned off. However, one screen heater is turned off when the first electrostatic latent image formation is completed. Next, when the "START" key to start copying is pressed, the screen drum motor 301
rotates.

At this time, the reciprocating clutch of the optical system is actuated, thereby driving the optical system synchronously with the screen drum. 1st
In the figure, to explain the mechanism of the optical system, the original on the original glass is illuminated by the original illumination lamp 52, and the first reflection mirror 53, which is installed integrally with the original illumination lamp 52 and the lamp reflection mirror, It moves at a speed V that is mutually synchronized with the circumferential speed of the drum 1. The optical image obtained by irradiation with the document illumination lamp passes through a first reflection mirror 53 and a second reflection mirror 54, and then a lens 55 supported by a lens house, and further a third reflection mirror 56 and a third reflection mirror 56 fixed to the lens house. 4 reflective mirror 5
7. After passing through the fifth reflecting mirror 58, the screen drum 1
to project. The second reflecting mirror 54 moves in the same direction as the first reflecting mirror 53 at a speed of 1/2V. In this case, the first
The cam plate attached to the first reflecting mirror mounting base on which the reflecting mirror 53 is installed sequentially moves the micro switch MSl~
It is designed to move while operating MS6. The home position of the optical system is at the MSl position, and now the STAR
If the optical system is not in that position when the "T" key is activated, the optical reciprocating clutch 302 (FIG. 3) is turned on, and the screen/drum motor 301 is driven to the optical system, and the optical system is moved to its home position. Move to MSl and turn off 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 reciprocating clutch 303 is turned on, the force of the screen drum motor 301 is transmitted to the optical system, and the screen drum begins to move. Also, at this time, the document illumination lamp 52 (304 in FIG.
) lights up. The cam plate that moves together with the first reflecting mirror 53 moves from MS1 and operates MS5 and MS6, but is electrically cut off. MS3 turns on the front part of the primary charger 4, and MS4 turns on the rear part of the primary charger.
At the reversal position MS2 between the backward movement and the forward movement, the optical backward movement clutch 303 is turned off, and 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.

Once again, MS4 and MS3 operate in this order, but are electrically cut off. Proceeding further, use MS5 to install the primary charger (front)
, and then use MS6 to charge the primary charger (rear).
The charging of the battery is terminated. Further, when the optical system returns to the home position MS1, the optical reciprocating clutch is turned off, stopping the optical system and simultaneously turning off the document illumination lamp 52. Furthermore, from this point on, a timer starts working and the AC static eliminator 6 is turned off after a certain period of time. After that, when the screen drum comes to the home position, the screen/drum motor 301 is turned off, and the insulated drum motor 328 is turned off.
turns on. Therefore, as is clear from the figure, latent image formation is completed after two rotations of the screen drum. Note that MS7 and MS8 are provided outside this process, and this is a safety device that will stop the machine if it overruns. The insulated drum motor 328 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 screen drum motor and the insulated drum and the insulated drum motor are connected by a one-way clutch, so that the screen drum and the insulated drum are connected to each other by a one-way clutch. While the drum motor is in operation, it rotates at its circumferential speed, and when it is turned off and the insulated drum motor is simultaneously turned on, the speed of both drums instantly increases to approximately twice that. While the screen/drum motor 301 is rotating, the front illumination lamp 3 and the full illumination lamp 7 are turned on, and the original illumination lamp 52 is turned on.
An optical cooling fan 326 is driven to prevent heat from accumulating in the optical system due to irradiation. Moreover, at the same time when the [START] key is activated, the powder image transfer charger 36, paper separation charger 37, insulating drum static eliminator 50, and paper separation suction fan 31 are activated.
9 (FIG. 3) is turned on and turned off at the end of the copying operation. However, since the banders 36, 37, and 50 mentioned above have a circumferential speed of the screen drum and the rotational speed of the insulating drum is slow, no extra charge is charged on the insulating drum. Lower the potential as shown in Figure 3 317, 318, 32
1). Next, after the primary latent image is formed, the screen drum motor is turned off and the insulated drum motor is turned on.
Copying operations such as modulation, development, paper transfer, and separation are started.

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 this with reference to FIG. 3, first, the rotation of the drum is switched to the insulated drum motor 328, and at the same time, the cleaning motor 320 is used to transmit the force of the cleaning motor 320 to the pre-modulation charger 310 and the conveyor belt 38 (FIG. 1). Transport roller clutch 316 is turned on. As the rotation progresses,
When the screen drum advances 8σ from its home position, the modulation charger 311 for transferring the static latent image formed on the screen drum to the insulating drum is turned on.
At 310, the paper feed roller clutch 314 is turned on to feed one sheet of paper on the paper feed tray, and at 350, the developing motor 312 and the reversible toner clutch 314 are turned on to agitate the toner staying in the developing device. - The anti-bristle motor 313 turns on. After the screen-drum starts modulation, it enters the second rotation cycle, and the paper feed roller Kukutchi 314 turns off at the 30-degree position, thereby separating the leading edge of the fed paper and the developed visible image on the insulating drum. Timing roller clutch 315 is turned on to align the tips. If the number of copies is l, the pre-modulation charger 310 and the modulation charger 311 are turned off at the position 801, but in this case, since there are two copies, they are not turned off. Proceeding further, the paper feed roller clutch 314 is turned on at 310 sheets, and the second sheet is fed. 1st timing roller in 360 pieces
Clutch 315 is turned off.

Entering the third rotation cycle, the paper feed roller
Clutch 314 is turned off and second timing roller clutch 315 is turned on.

At 80g, the pre-modulation charger 310 and the modulation charger 311 are turned off.

If one copy is to be made, the developing motor 312 and the toner bridge prevention motor 313 are turned off at this point. 360
At 0, turn off the timing roller clutch again.

Entering the fourth rotation cycle, developing motor 3 at 80
12 and the toner bridge prevention motor 313 are turned off.

At 3600, the insulated drum motor 328 and transport roller clutch 316 are turned off, ending the retention cycle.

Separation pawl solenoid 329 (
73) in Fig. 1, the tip of the paper is the lamp 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.

(Explanation of sequence control circuit configuration) FIG. 4 is a block diagram of the control section.

External signals include signals from the keyboard that issue operation commands, detection signals for the home position of the screen drum that serve as the reference for the sequence, signals from the pulse generator synchronized with the rotation of the insulating drum, and the timing of primary latent image formation. The six micro-switch signals to be determined are input to the central control section.
Based on these input signals, the central control section makes full use of two memories and three counters to perform storage and judgment, and outputs appropriate signals to the interface section. The screen drum home position is detected by the detection pulse 330 (Figure 3)
is obtained by the magnet 68 and magnetoelectric transducer 61 (FIG. 1) on the screen drum each time the screen drum rotates.

The determination pulse (1) 331 is obtained after the electrostatic latent image formation on the screen drum is completed and the optical system returns again to its home position MSl, and subsequently during the home position of the screen drum. The insulated drum motor is started by determining whether or not the memory (1) 202 and the screen drum counter 409 are equal to each other at the generation time of this determination pulse (1) 331 and whether or not a STOP command has been issued. A decision is made as to whether to start the process of forming the secondary latent image, restart forming the primary 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 Figure 5.

That is, the above decisions are indicated by 4, 0, and 7 in sequence. Furthermore, when this flow chart is expressed as an electric circuit, it becomes as shown in FIG. If we define the vertical busbar as a column and the horizontal busbar as a line, the control commands indicated by ◇ in Figure 5 are from columns 601 to 601.
604, respectively. Also, this signal is sent to the inverter 6
05-608 and connected to columns 609-612. Lines 613-617 are connected to the power supply through resistors. This power supply must be at a level equal to logic level "F". For example, the condition O in Figure 5 is “STO
There is no P command, pilot lamp 1 is not lit, and a value is stored in memory 2. ”, so if we express this in a logical formula, “O=FSTOP-FSOO-
1L=0゛.

Therefore, by connecting diodes to each of the columns 609, 610, 611 and the line 615 in the direction shown in the figure, an AND circuit is formed and the line 615 goes to the "1" level only when the columns 609, 610, 611 are at the "1" level. In other words, when the condition O is satisfied, the line 615 becomes 1r.
Become ゛. Similarly, the condition 6 to [F] is the line 61
3 to 617. Furthermore, lines 613 to 617
is inverted by inverters 618-622, and line 623
~627. Columns 628 to 630 that intersect with these lines 623 to 627 are connected to power supply E through resistors,
Again, if a diode matrix is formed here, the line 630 will go to the ``O'' level only when the condition ``4 or [F]'' is satisfied, and the output 6 of the inverter 633 will be at the ``O'' level.
44 becomes "6+[F]" in the logical expression, and becomes the "1" level only when the above-mentioned condition is satisfied. Therefore, the screen drum home position pulse DHP, which is the separation point of the operation, is determined by the gate 63.
8, it is possible to issue an operation command 7 to end the sequence and latch the memory circuit. Similarly, 4? This makes it possible to issue command signals. ◎ In the case of the second signal, the output of the chargers 36, 37, and 50 mentioned above is the second signal.
It is lowered as shown in Figure 0. Now, the condition 4 is satisfied and 4
When the signal 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 5694 is rotated in synchronization with the drum by the gear. Then, a hole made on five circumferences of the disk 59 passes through a pair of light emitting elements and a light receiving head 600, and a number signal generated is extracted as a clock pulse 332 (third?). This clock pulse (generates one pulse per revolution of the screen drum, 360 pulses per revolution. One hole is drilled per disk of the same diameter as the screen drum. Since it is difficult, we set up a separate disk and use a gear to make the rotation of this disk n times that of the screen drum.
The number of holes on the disk is set to 1/n. In the image processing process after modulation in this device, this Q 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. As a result, the clock pulse 332 activates the binary coded 360-decimal counter, and the clock pulse 332 in FIG.
It outputs 3 to 345 control pulses.

An example of a circuit for generating this control pulse is shown in FIG. Inherit 10 flip-flops and make clock pulse O~
Create a 360-decimal counter that counts up to 359.
The first four flip-flops represent the ones digit, O~
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 O to 9, the last two digits indicate the 100 digit, and a ternary counter that repeats counting up to 9. It is a counter. However, when the count progresses from 0 and changes from 359 to 360, a set signal is output from the decoder and all flip-flops are turned off.
be made into Thus, for each rotation of the screen drum, O~
It becomes a 360-decimal counter that repeats the count up to 359. The control pulses 333 to 345 in FIG.
It is generated by decoding it with . Incidentally, if it is desired to change the timing of the sequence 31j0 to 316 in FIG. 3, this can be done by arbitrarily changing the position of the diode of the decoder. For example, paper feed noise that cannot be adjusted with a combination of micro switch and cam,
Fine adjustments such as registration between the leading edge of the paper and the developed image on the drum can be easily made. In Fig. 3, for example, the pre-modulation charger 3t0 turns on at 1 count in the first cycle, and if the number of copied songs is 1, it turns off at 80 counts in the second cycle, and if 2 songs are copied, it turns off at 80 counts in the second cycle. For example, a control pulse must be selected to turn off at count 80 of the third cycle.

The present invention consists of two insulated drum counter ICs as shown in FIG.
．． The selection is made easy by counting the discrimination pulses 2 using the IC'' and comparing the count value with the memory 2.

That is, the 347 insulated drum counter IC is activated to count 61'' from the second cycle, and if the memory 2 that stores the desired number of copies and the counter value are equal, the on signal during that cycle is killed. .From then on,
Stop this counter. However, for example, the timing roller clutch does not reach 1 for the first time in the second cycle.
Operates on the second sheet of paper. However, the insulated drum counter 1C and memory 1'T. Comparing 1 and 2, the counter is already equal to memory 2 in the third cycle, so no action of this clutch is performed for the second sheet of paper.

Therefore, the present invention provides an insulated drum counter 1 that counts up one count later than the counter described above.
The insulated drum counter IC compares memory 2 with memory 2 to control the on/off of the clutch. In the case of Figure 3, the insulated drum counter IC matches memory 2 in the third cycle and stops counting. On the other hand, insulated drum counter 1C
'2 matches Mekiri-2 in the fourth cycle. Therefore,
In the fourth cycle, insulating drum counters 1 and 2 coincide. 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 pulse 2, the two counters are cleared, and the screen drum counter and the desired number of latent image formations are again cleared. It is checked whether the memory 1 in which the . 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 primary latent image is repeated. FIG. 16 is a diagram showing an example of drive control of each device.
Reference numerals 312, 314, and 315 are the paper feed roller clutch, pre-modulation charger, developing motor, and timing roller clutch shown in FIG. 3, and 160 is an amplifier for operating these;
9,170 is the flip-flop gate, 161,16
4, 166, 168 are inverters, 162 is a NAND gate, 163 is a NOR gate, and 165, 167 are AND gates. When each matching circuit determines whether the counter 1C1IC' matches the sheet value setting memory 2, the on-pulse is stopped and the off-pulse is used to stop the equipment, 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 a jam when the paper gets 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,
In FIG. 1, a light source 69 and a light receiving element 70, and a light source 71 and a light receiving element 72 are provided. When the leading edge of the paper blocks the light source 69 (
SGl), the pulse of the clock pulse generator is picked up by the light receiving element 70, the jam counter is started, and when the leading edge of the paper blocks the light source 71 (SGO), the output of this counter is decoded by the light receiving element 72 for separation confirmation. Make it output a detection pulse SDP. The count number of the detection pulses 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 or cannot be separated, the paper will not block the light source 71 even though the separation detection pulse is output. Therefore, the jam signal JP is outputted by a circuit as shown in FIG. b. In figure b, 81 is a gate and 82 is a flip-flop. Further, by using this counter, a pulse signal for creating the timing for operating the separating claw 73 (FIG. 1) can be outputted from the same decoder.

The sequence control unique to the present invention after jam detection will be explained with reference to FIG.

In the event of a jam, the insulated drum motor is immediately stopped using an electromagnetic brake and all sequences are turned off, but repairs can be made without turning off the power switch. The repair counter display remains stationary, displaying the number of counts at the time of the jam. When the repair is completed, pressing the START key again will rotate the screen drum motor and rotate the screen drum to its home position. Then, at the home position, the screen drum motor is turned off and the insulated drum motor is turned on. Since the electrostatic latent image on the screen is retained during the jam repair, the sequence operation after the above-mentioned modulation is restarted. The details of the timing are shown in Figure 9. In the sequence after modulation, the insulated drum is
Since it requires half a rotation (3 rotations of the screen drum),
When restarting after jamming, insulated drum counter 1C1
And, while C2 is stopped, the timing of the first sequence after modulation must be created. For this purpose, as shown in FIG. 9, prohibition time 1 and prohibition time 2 are created in the 1st cycle and the 2nd cycle of the sequence, thereby controlling the sequence of the first sheet. 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 jamming cases.

When the 11th sheet is jammed, that is, insulated drum counters 1 (IC) and 2 (IC')\memory 2 are jammed, 2
Jam when IC=memory 2, jam when 3IC'=memory 2.

The counter movement for restarting after jam is shown below.

However, it is assumed that memory 2=4. 1, from the third cycle, IC. Both IC' count up.

In the case of 2, only IC5 is counted up in the third cycle, IC=IC', and the process ends at the end of the third cycle.

In the case of 3, the count does not increase even when entering the third cycle, and IC=C' is confirmed at the end of the third cycle and the process ends.

2 and 3 end up in the same cycle, but the jam occurs near the paper leading edge detector for a reason such as "feeding two sheets," or if the paper is not separated properly. This is because there is a difference between 2 and 3 depending on the time difference in jamming even with paper.

A sequence control method using inhibit times 1 (NHl) and 2 (INH2) will be described. In the sequence of restarting after jamming, the first sheet must be copied in any case, so in prohibition time 1, 310 to 3 in Figure 3 are used.
14 functions are turned on at the appropriate timing. 31
5 is also turned on at the appropriate timing of INH1 and INH2.

Next, at times INH1 and INH2, counter ICs 310 and 311 are compared with the contents of memory 2, and if they are already equal, they are turned off, and 314 is also not turned on, if they are equal. For cycles after INH2, IC. Since the IC' counter is controlled as described above, it is controlled by comparing memory 2 with these two counters, similar to the control in the normal case. The circuit for generating the above-mentioned prohibition time signals 1NH1 and 1NH2 is as shown in FIG.
3 and 184 are gates, FRSTRT is a start signal related to the start of rotation of the insulating drum, and FJ2 is a determination pulse 2. Gates 183 and 184 output INH1 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. The on/off pulses in the figure are the same as the sequence pulses in FIG. The control of the sequence after the latent image modulation described above uses the same method as the judgment flow shown in FIG. 5 and the judgment circuit shown in FIG. 6, which were explained in connection with the control of the sequence of primary latent image formation.

As is clear from the foregoing discussion, each cycle after modulation corresponds to one cycle of the 360-decimal counter that counts clock pulses. Pulses 334-345 in Figure 3 are generated at the appropriate number of counts in each cycle, but they are not used in their entirety, but only in cycles where the conditions are met to turn on the flip-flops for latching the associated equipment. Or to turn it off, set the 360-decimal counter to 0.
You can create a flow with ~359 as a loop. An outline of this flow is shown in FIG. 10, and if this flow is further represented by an electric circuit, it becomes as shown in FIG. 11. As described above, a flow in which a series of sequences based on pulse counting is programmed can be incorporated into a circuit consisting of two programs, a diode matrix and an in-part circuit, and therefore, no switches are required. It becomes possible to control the sequence without In Figures 10 and 11, SetFHVT5 turns on the pre-modulation charger, Reset
tFCL3 is a command to turn off the drive of the paper feed roller, SetFCL4 is a command to turn on the drive of the timing roller, and F
RSTRT indicates whether to start copying after modulation, FI
OO determines whether or not there is multi-retention. The blank space in FIG. 10 can also output commands to operate the required equipment at the corresponding 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 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 visible image. It affects the shading, contrast, etc.
Therefore, in the present invention, the potential of the modulation charger is increased as the number of retentions progresses in order to correct the change in the image due to the decrease in the potential. In the case of this device, as shown in Figure 12, the potential of the first sheet is higher than that of the second and subsequent sheets, and then the potential of the 10th, 30th, 50th, 70th, and 90th sheets. Increase gradually. The potential can be raised or lowered by varying the input voltage on the primary side of the high-voltage transformer.For example, using Figure 13 as an example, this resistance can be increased or decreased by connecting six resistors in series and using a relay that moves as the number of retention increases. The potential is raised by sequentially short-circuiting.

These resistors may be connected in series, or different resistance values may be connected in parallel and each of them may be switched. The timing for operating the switches such as the relays is shown in FIG. This timing can be created by combining the insulated drum counter 1 and the modulated charger on-pulse. For example, in the case of this device, the 2nd, 10th, 30th, 50th
The potential is changed at the 15th, 70th, and 90th sheets, so the 15th
As shown in the figure, the timing at which the modulated charger on-pulse is gated by the decoded output of the insulated drum counter 1 is the timing for activating the relay. Therefore, the second sheet is IC=
1st and 10th sheets are C=9, 30th sheet is IC-29, 50th sheet is IC-49, 70th sheet is IC=69, 90th sheet is I
At clock pulse = 80 counts when C = 89, actuation pulses for relays K1 to K6 are output, and latches 1 to 1 are output.
6 and activate the coils of relays K1 to K6. 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 process of forming the primary latent image, and the deterioration of the photoreceptor is generally caused by the passage of current through the photoreceptor, so the deterioration of the light source and the screen photoreceptor is the main cause. This occurs during the process of forming the first electrostatic latent image, and has little to do with subsequent processes. Therefore, in such a copying device, when accounting for copying fees,
Like conventional copying machines, charges are charged differently depending on the size and quality of the copy paper. In addition, a total method is required that takes into consideration the difference between the process of forming the primary latent image on the screen photoreceptor and the subsequent process of transferring it to copy paper. An example will be explained based on FIG. 19. In the figure, 191 is a total counter that counts the number of electrostatic latent images formed on the screen photoreceptor, 192 is for forming a secondary latent image from the primary latent image on the screen drum on an insulating drum, A total counter that counts the number of times the electrostatic latent image is developed and the developed image is transferred to copy paper (this corresponds to the number of copies made). Corresponds to the numbers in Figure 2 (operation panel block diagram). Let's explain its operation. Count up switch 2 every time the original image is exposed and an electrostatic latent image is formed on the screen drum.
41 is repeatedly turned on and off, 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. But total counter 19
1 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 counts up to the previous count value + 1.
Start counting from. Further, each time the count-up switch 242 in the process of forming a secondary latent image, developing it, and transferring it to copy paper is turned on and off, the counter 204 and the total counter 192 are set to the counter 201 and the total counter, respectively. The operation corresponding to the counter 191 is performed, and the total counter 201 continues to count the total number of copy sheets that have been copied without its contents being 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. Payment will be made in separate fees. As described above, by accounting for copying fees, when multiple copies of the same original painting are made, the unit price of each copy becomes cheaper as the number of copies increases, and an accounting system that takes advantage of the features of the present invention becomes an accounting method. achieved. The above description has been made using a copying apparatus that transfers a visible image onto plain paper as an example, but the present invention directly transfers a latent image formed on a photoreceptor by exposure to light onto plain paper, develops it, and copies it. This method is effective both in applications that use the so-called TESI method for producing objects, and in applications in which a secondary latent image on an insulated drum is directly transferred onto plain paper and developed to produce 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.
4 is a block diagram of the control section of the copying apparatus according to the present invention, FIG. 5 is a flowchart of sequence determination, and FIG. 6 is a flowchart of the sequence determination. Figure 7 is a driving circuit diagram of each device, Figures 8A and b are time charts and circuit diagrams of jam detection operation, and Figure 9 is a diagram of equipment operation after jam detection. Time chart, Figure 10 is a more detailed flowchart of sequence judgment, Figure 11 is an example circuit diagram embodying it, Figures 12 and 13 are for correcting image quality changes due to retention copying. 14 is a time chart of the operation of FIG. 13, FIG. 15 is an example of the drive circuit of FIG. 13, FIG. 16 is an example of the drive circuit of the device in FIG. 3, and FIG. The figure is a sectional view of a screen photoreceptor, Figure 18 is an example of a prohibition time signal generation circuit during jamming, Figure 19 is a schematic diagram of the accounting system, Figure 20 is an example of a charger output control circuit, and Figure 21 is an example of a charger output control circuit. 18 is an example of a signal generation circuit for FIG. 16 using FIG. 4, 202 is a first memory, 201 is a screen drum counter, 203 is a second memory, 413 is a first insulated drum counter, 41
4 is a second insulated drum counter.

Claims (1)

[Claims] 1. A setting key for setting the number of sheets, a display for displaying numerical values, a memory for storing the number set by the above setting key, a clear key for clearing the set number stored in the above memory, and a display for displaying the numerical value. an image forming means for performing image forming operations for the number of stored settings; a control means for displaying the number of settings on the display and executing the image forming operations; and clearing of the number of settings in the memory using the clear key in the event of device trouble. An image forming apparatus comprising: means for inhibiting input.