JPS6322581B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an image forming apparatus that sequentially controls image formation based on control signals output from a memory. Conventionally, in order to prevent wasteful consumption of recording material, image forming apparatuses do not feed the recording material when a stop input is received to stop the image forming operation before feeding the recording material. It is known to shut down the device. (Special Publication No. 42-23918) However, the device described in Japanese Patent Publication No. 42-23918 has the disadvantage that the configuration is complicated because when there is a stop input, the latch circuit for paper feeding is released and the device is stopped. There is. Furthermore, in this case, the only option is to either stop the device without feeding the recording material by releasing the paper feeding latch, or to feed the paper and form an image. Nakatsuta. The present invention has been developed in view of this point, and it is possible to stop the device in response to a stop input with a simple configuration, and in a device capable of forming images in multiple modes, it is possible to perform image formation according to the mode. The present invention provides an image forming apparatus that provides a unique image forming apparatus. That is, the present invention selects a paper feeding means for feeding a recording medium, an image forming means for forming an image on the recording medium, and a sequence to proceed to next at a predetermined time after the operation of the image forming means starts. The conditional signal generation source that generates the signal for (FIG. 6 IL=0,
SL=SC), and a stop input means (STOP in FIG. 1) for stopping the sequence after the image forming means starts operating but before the image forming means completes image formation.
and a sequence control means (FIG. 6) for sequentially controlling the image forming means, and the sequence control means has a memory means (FIG. 6A) for outputting a control signal for forming the image. ) and determining means (FIG. 6B) for determining the signal from the memory means and outputting a sequence control signal, and at a predetermined time after the start of operation of the image forming means and before feeding of the recording medium. The presence or absence of a stop signal based on the stop input means and the sequence selection signal from the condition signal generation source are determined via the memory means, and when it is determined that the stop signal is present, the selection signal from the condition signal generation source is determined. Regardless,
and stops the apparatus at a predetermined point without feeding paper by the paper feeding means, and when there is no stop signal, selects the next sequence to proceed to in accordance with the selection signal from the condition signal generation source and starts image formation. (Fig. 5, Fig. 6). 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. 17) has ring-shaped ends, which are connected by a connecting band and stretched with adhesive onto an integrated metal screen drum base. It is installed on the shaft. 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 modulation charger 11 and a pre-modulation charger 13 are 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 mounted on a fixed tubular screen drum shaft via ball bearings. The screen drum 1 is rotatable around a fixed screen drum shaft. The screen photoreceptor of the screen drum 1 has a photoconductive member 7 on a conductive member 70 having a large number of fine holes.
1 and an insulating member 72 are laminated 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 100 to 400 mesh from the viewpoint of resolution for copying.
A suitable one is one that can secure an aperture ratio of 50% or more. The photoconductive member is produced by vapor deposition of Se alloy, etc., spray coating with an insulating resin dispersion containing particles of CdS, PbO, etc., etching, etc. 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 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 erase undesirable ghosts on the screen photoreceptor, and a primary charger 4 applies a uniform electrostatic charge to the screen photoreceptor. Since the diameter of the screen drum is relatively small, the front end of the image may be charged again during the formation of an electrostatic latent image on the screen photoreceptor even though the electrostatic latent image has already been formed. Therefore, the primary charger 4 is divided into two parts, each with the same voltage,
The same current is applied with a time gap. The AC static eliminator 6 is provided to remove the electric charge on the photoreceptor according to the optical image 5 of the original irradiated by the original irradiation lamp 52. Further, instead of the AC static eliminator, a DC static eliminator having a polarity opposite to that of the primary charger may be used. 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 supported on an insulating block 9 facing the screen drum 1 and closest to the drum 8; A pre-modulation charger 13 is attached to 12, respectively. Also, dust may adhere to the screen drum 1.
In order not to interfere with the formation of the next latent image and the secondary latent image, floating dust is attached to the back plate 16 of the discharger by the blower 14 and the discharger 15 in the middle, and the dust is sent to the screen drum 1 from the dust removal nozzle 17. Blow clear air into the area. In addition, if the screen photoreceptor is adversely affected by low temperature and high humidity, heat source 1
8 may heat the air being blown. 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 has 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. It is used to apply voltage. 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 the 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 table 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. is raised along the guide rail 32 by the drive of. Pick up roller 33 from the top of the paper
The copy paper is fed out so that it almost matches the visible image on the insulated drum 8, and the timing and
It is conveyed by a roller 34 so as to match the visible image on the insulating drum 8, and the visible image on the insulating drum 8 is transferred onto copy paper by a transfer charger 36 via a conveying roller 35. Further, the separation charger 37 weakens the adhesion force between the insulating drum 8 and the copy paper, and the copy paper is separated from the insulated drum 8 and transported by a conveyor belt 38 having a suction device 39 built therein. The conveyor belt 38 is stretched around belt drive rollers 40 and rollers 41 and 42, and is rotated by the rotation of the rollers to convey the copy paper while sucking it. is sent to the 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 is 2
It consists of two displays 62, 63, two pilot lamps 65, 66, and a keyboard 64.
Key “O” on keyboard 64 (ORIGINAL)
is used to set the number of times the electrostatic latent image is formed on the screen drum 1.Following this key, if you press a numerical key from ``0'' to ``9'', the contents of the presses will be displayed on the display. 62 will be entered. or,
If the "∞" key is pressed after the numerical key has been entered, the contents of the display 62 will be cleared,
Turn on the "∞" pilot lamp 65.
Conversely, if 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. That is, numerical data and "∞" command are automatically switched. Note that "∞" means that the operation is performed indefinitely until a "STOP" command (described later) is received. Next, the key "R" (RETENTION) is used to set the number of copies that can be repeatedly obtained by one electrostatic latent image formed on the screen.
Entry for the numeric key or "∞" key is similar to that for the "O" key, and its contents are displayed on the display 63 or pilot lamp 66. For example, to enter <<123>> on the display 62 and <<456>> on the display 63, the key operations are "O" → "1" →
"2" → "3" → "R" → "4" → "5" → "6"
The order is as follows. Therefore, the numeric keys from "0" to "9" and the "∞" key are switched between the two function keys "O" and "R" to display the two displays 62, 63,
Alternatively, entry can be made to the pilot lamps 65 and 66 as desired. Of course, either the "O" key or the "R" key may be specified first. Next, the "CO" (CLEAR ORIGINAL) key is used to clear the display 62 or pilot lamp 65, and is used to correct numerical data entered incorrectly. Therefore, the display 6
If you want to correct the entry ≪123≫ in 2 to ≪456≫, enter “CO” → “O” → “4” → “5”
→Press the keys in the order of “6”. "CR"
The (CLEAR RETENTION) key also serves a similar purpose, and it
Clear 6. 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 indicates that the contents of the display 62 are <<
000≫ and pilot lamps 65, 66
This is when both 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 later-described inhibition circuit. In addition, when <<002>> is entered on the display 62 and <<003>> is entered on the display 63, after the primary latent image is formed on the screen drum, modulation, development, and transfer are repeated three times, and this cycle is repeated again. , six copies are obtained. At this time, with the operation of the "START" key, the above two displays will display ≪000≫, and as the copying operation progresses, ≪001≫≪002
≫Display... (Description of operation panel circuit configuration) FIG. 2 is a block diagram of the operation panel circuit according to the present invention. The memory 202 and the counter 201 are
It corresponds to the display 62 and stores and counts the number of electrostatic latent images that can be 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 gated by the output signal 214 of the inhibit circuit 216, and this signal line 214 is normally at the "1" level, When the prohibition circuit 216 is activated, it becomes the "0" level, and no output is generated even if the key group is operated. Prohibited circuit 2
16 is a flip-flop 209, 210, 2
11 and two OR gates 222 and 223. Each of the flip-flops memorizes that the ``START'' key is pressed, that the ``STOP'' key is pressed, and that there is a jam such as a paper jam, feeding two sheets of paper, or poor paper separation. Flip-flops 209 and 210 are never set; when one is set, the other is reset.
In other words, the START command and STP command cannot work at the same time. Also, when flip-flop 211 is set, flip-flops 209 and 210 are always reset, and all operations are interrupted when a jam occurs. The outputs of OR gates 222 and 223 are normally at "1" and "0" levels, respectively, but when any one of flip-flops 209, 210, and 211 is set, they become "0" and "1" levels. Invert. That is, the "START" key,
When either the "STOP" key or JAM detection is in operation, the prohibition circuit 216 is activated, and the signal line 2
14 becomes "0" and the signal line 215 becomes "1". Therefore, the keys 217, 218, 220 on the operation panel,
221 is prohibited, and at the same time gates 225, 2
26 is closed, 224, 227 are open and the indicator 62,
The contents of the counters 201 and 204 are displayed on the display 63, replacing the contents of the memories 202 and 203. During the copying operation, only the "STOP" key works. Therefore, the moment the "START" key is activated, the counter is zero, so the display 62 shows <<002>>
→<<000>>, 63 becomes <<003>>→<<000>>. 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 counter is cleared to zero in preparation for the next operation, and the displays 62 and 63 display the numerical values in the memory again. When the "STOP" key is pressed at any point during the copying operation, the operation ends at a well-defined point in the process from that point. Next, flip-flops 205 and 206 remember that the "O" and "R" keys were pressed, respectively, and neither of these are set.
When one sets, the other always resets.
If the "O" key is now pressed, flip-flop 205 is set and gates 228 and 229 are opened. Subsequently, when any key of the numerical key group 217 is pressed, the numerical value is entered into the memory 202 through the gate 228 . At this time, the flip-flop 20 remembers that the "∞" key was pressed.
7, if the pilot lamp 234 is lit, it is reset via the signal line 232 and the lamp is turned off. Also, when the "∞" key 221 is pressed instead of the numeric key group 217, it passes through the gate 229 and sets the flip-flop 207.
At the same time when the pilot lamp 234 (65 in FIG. 1) is turned on, if some numerical value has already been stored in the memory 202, it is cleared through the signal line 233. Therefore, the entry of a numerical value into memory and the ``∞'' command are never true at the same time; if one is true, the other is always not true. Further, when the "R" key is pressed, flip-flop 205 is reset, flip-flop 206 is set, and gates 230 and 231 are opened. Thereafter, as in the case of the "O" key described above, the numerical value of the key group 217 passes through the gate 231 and enters the memory 203, and the "∞" key passes through the gate 230, sets the flip-flop 208, and turns on the pilot lamp 235. (66 in Figure 1) lights up. Also, if the memory 203 is entered, the flip-flop 208 is reset, and vice versa, if the memory 203 is set, the memory 203 is cleared.
Therefore, the entry of numerical data into memory and the "∞" command are automatically 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) Figure 3 is a time chart showing the operation sequence of the copying machine shown in Figure 1, in which commands from the operation panel are
This is the case of ORIGINAL≪002≫ RETENTION≪002≫. First, when the power switch is turned on, a cleaning motor 320 for collecting residual toner dropped from an insulated drum and driving a conveyor belt, a screen dust collector 15 (Fig. 1), and a screen dust-proof fan 14 (Fig. 1) , the two screen heaters 18 (FIG. 1) and the developing dust collecting fan 325 that sucks the toner floating in the developing device start operating, and continue to operate 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 for starting 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. To explain the mechanism of the optical system in Fig. 1, the original on the original glass is
2, and the first reflecting mirror 53, which is installed integrally with the document illumination lamp 52 and the lamp reflecting mirror, moves at a speed V that is synchronized with the circumferential speed of the screen drum 1. The optical image obtained by irradiation with the original 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 5 fixed to the lens house.
6. The image is projected onto the screen drum 1 via the fourth reflecting mirror 57 and the fifth reflecting mirror 58. The second reflecting mirror 54 is connected to the first reflecting mirror 5 at a speed of 1/2V.
Move in the same direction as 3. 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 MS.
It is designed to move while activating MS 1 to MS6. The home position of the optical system is at the MS1 position, and if the optical system is not at that position when the "START" key is activated, the optical forward clutch 30
2 (FIG. 3) is turned on, the drive of the screen/drum motor 301 is transmitted to the optical system, moves to its home position MS1, and the clutch 302 is turned off. 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 original illumination lamp 52 (304 in FIG. 3) is turned on. The cam plate that moves together with the first reflecting mirror is
Move from MS1 and operate MS5 and MS6, but electrically cut off. Primary charger 4 with MS3
(front) turns on, and MS4 also turns on the (rear) 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 3 is turned off.
02 is turned on and the movement of the optical system is reversed.
The AC static eliminator 6 (308 in FIG. 3) is turned on. again,
MS4 and MS3 operate in that order, but are electrically cut off. Proceeding further, MS5 terminates charging of the primary charger (front), and then MS6 terminates charging of the primary charger (rear). 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. Further, from this point on, a timer starts working and the AC static eliminator 6 is turned off after a certain period of time. Thereafter, when the screen drum reaches the home position, the screen drum motor 301 is turned off and the insulated drum motor 328 is turned on. Therefore, as is clear from the figure, latent image formation is completed after two rotations of the screen drum. In addition, outside of this process, MS
7. This is a safety device installed in the MS8 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 meshed with each other through gears, and the screen drum and screen drum are
The drum motor, insulated drum, and insulated drum motor are connected by a one-way clutch, so while the screen drum motor is driving both drums, it rotates at its circumferential speed, and when it is turned off, When the motors for the insulated drums are turned on at the same time, the speed of both drums instantly increases to approximately twice that. While the screen/drum motor 301 is rotating, the front irradiation lamp 3 and the entire surface irradiation lamp 7 are turned on, and the optical cooling fan 326 is driven to prevent heat from accumulating in the optical system due to the irradiation of the document illumination lamp 52. Also, at the same time as 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 319 are activated.
(FIG. 3) is turned on and turned off at the end of the copying operation. However, since the rotational speed of the insulating drum is slow due to the peripheral speed of the screen drum motor, the potential of the chargers 36, 37, and 50 is lowered to prevent excess charge from being charged on the insulating drum (Fig. 31).
7,318,321). Next, after the primary latent image is formed, the screen drum motor is turned off and the insulating drum motor is turned on, thereby starting copying operations such as modulation, development, paper transfer, and separation. After modulation, the first page of copying is completed after the screen drum rotates three times.
After that, one copy is completed every time it rotates. To explain with reference to FIG. 3, first, the rotation of the drum is switched to the insulated drum motor 328, and at the same time, a conveyor is used to transmit the force of the cleaning motor 320 to the pre-modulation charger 310 and the conveyor belt 38 (FIG. 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 the screen drum to the insulating drum is turned on, and at 310 degrees, the screen drum is turned on. The paper feed roller clutch 314 is turned on to feed one sheet of paper on the paper feed table, and the developing motor 312 and the reversible toner bristle prevention motor are turned on at 350 degrees to agitate the toner staying in the developing device. 31
3 turns on. After the screen drum starts modulation, it enters its second rotation cycle, and at the 30° position, the paper feed roller clutch 314 is turned off, which causes the leading edge of the paper to be separated from the developed image on the insulating drum. Timing roller clutch 315 is turned on to align the tips. If the number of copies is one, the pre-modulation charger 310 and the modulation charger 311 are turned off at the 80° position, but in this case, since there are two copies, they are not turned off. Going further,
At 310°, the paper feed roller clutch 314 is turned on.
Feed the second sheet of paper. Turn off the first timing roller clutch 315 at 360°. Entering the third rotation cycle, at 30 degrees, the feed roller clutch 314 is turned off and the second timing roller clutch 315 is turned on. At 80 degrees, the pre-modulation charger 310 and the modulation charger 311 are turned off.
If you are copying one sheet, turn on the developing motor 31 here.
2 and turn off the toner bridge prevention motor 313. Turn off the timing roller clutch again at 360°. Entering the fourth rotation cycle, at 80 degrees, the developing motor 312 and the toner bridge prevention motor 313 are turned off. Insulated drum motor 328 and conveyor roller clutch 316 at 360°
off and end the retention cycle. The separating pawl solenoid 329 (Fig. 1) that separates the paper from the insulating drum is operated as shown in Fig. 3 by counting pulses from the time when the leading edge of the paper passes between the lamp 69 and the light receiving element 70 (Fig. 1). Work in the indicated position. 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 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 unit. Based on these input signals, the central control section makes full use of two memories and three counters to make storage decisions and outputs appropriate signals to the interface section. Screen/drum home position is detection pulse 3
30 (FIG. 3) by the magnet 68 on the screen drum and the magnetoelectric transducer 67 (FIG. 1) each time the screen drum makes one revolution. The judgment pulse 331 indicates that the electrostatic latent image formation on the screen drum is completed and the optical system is at its home position MS.
1 and then the home position of the screen drum is obtained. At the generation time of this judgment pulse (1) 331, the memory (1) 202
By determining whether or not the and screen/drum counter 201 are equal and whether or not a STOP command has been issued, the insulated drum motor is started.
A decision is made whether to start the process of forming the next latent image, restart forming the first 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. In other words, the above decisions are sequentially ○I, ○C,
Indicated by ○A. Furthermore, when this flow chart is expressed as an electric circuit of a memory, it becomes as shown in FIG.
If we define the vertical busbar as a column and the horizontal busbar as a line, the control command indicated by ◇ in Figure 5 is column 60.
1 to 604, respectively. Also, this signal is inverted by inverters 605 to 608 and sent to column 60.
9 to 612. Lines 613-617
is connected to the power supply with a resistor. This power supply must be at a level equal to logic level "1". For example, the condition shown in Fig. 5 is ``There is no STOP command and the pilot lamp 65 (Fig. 2 234)
is not lit and a value is stored in memory-2. ”, so if we express this in a logical formula, we get
“=・∞・=0”. Therefore,
Each of columns 609, 610, 611 and line 6
If you connect 15 with a diode in the direction shown in the figure,
An AND circuit is formed, columns 609, 610,
Only when line 611 is at "1" level, line 615 is at "1" level. That is, line 615 becomes "1" when the following condition is satisfied. Similarly, the condition ~ is output on lines 613-617. Further, lines 613-617 are inverted by inverters 618-622, and lines 623-617 are inverted by inverters 618-622.
627. This line 623-627
Connect columns 628 to 630 that intersect with the power supply E with a resistor.
If the diode matrix is formed here again, the line 630 will be at the "0" level only when the "or" condition is satisfied.
The output 44 of the inverter 633 is expressed as “+
“1” only when the above conditions are met.
become the level. Therefore, this discrimination pulse (1)FJ
By passing the screen/drum home position pulse DHP, which is the time point between 1 and the operation, through the gate 638, it is possible to issue the operation command ○a to end the sequence and latch the memory circuit. In the same way, it is possible to issue command signals for ○I○U. ○ In the case of the signal C, the chargers 36, 37,
The output of 50 is lowered as shown in FIG. In other words, when it is determined that there is a stop signal (FSTOP), the operation command ○ in Fig. 6 is activated at a predetermined point (DHP, FJI ), and the device will stop accordingly. The point at which this device stops is before the recording material is fed, as is clear from FIGS. 3a and b, and when the device stops,
No recording material is fed. If there is no stop signal (FSOP), image formation is performed by selecting the sequence ○A or ○C according to the condition signal (FS∞, IL=0, SL=SC). When the following conditions are met and the ○ signal is obtained, the screen/drum motor is turned off, the insulated drum motor rotates, the drum speed is switched to high speed, and the gear synchronizes with the drum, causing the disk 59 (Fig. 1) rotates. and disk 5
A hole made on the circumference of 9 passes through the gap between the pair of light emitting element and light receiving element 60, and a signal generated by the hole is extracted as a clock pulse 332 (FIG. 3). This clock pulse produces one pulse per degree of rotation of the screen drum, or 360 pulses per revolution. screen·
It is difficult to drill one hole per 1 degree in a disk with the same diameter as the drum, so we created a separate disk and used a gear to make the rotation of this disk n times that of the screen drum, reducing the number of holes in the disk to 1/n. I try to do that. In this device, in the process after modulation, this clock pulse is processed to become a driving signal for the equipment. That is, in the process after modulation, as shown in Figure 3, the first copy is completed after the insulated drum makes one and a half revolutions, and from the second copy onwards, copies are made every half revolution, so sequence control is required. By setting the reference value to half a revolution of the insulating drum, that is, one revolution of the screen drum, the binary coded 360-decimal counter is activated by the clock pulse 332, and 333 in FIG.
~345 control pulses are output. An example of a circuit for generating this control pulse is shown in FIG. 10 flip-flops are connected to form a 360-decimal counter that counts clock pulses from 0 to 359. The first four flip-flops represent the 1's digit, and the decimal counter repeats the count from 0 to 9. The next four flip-flops represent the 10's digit, and the decimal counter repeats the count from 0 to 9. The decimal counter, the last two digits indicate the 100 digit, is a ternary counter. However, the count advances from 0 and is 359.
→When changing to 360, a reset signal is output from the decoder and all flip-flops are set to 0. In this way, it becomes a 360-decimal counter that repeats the count from 0 to 359 for each revolution of the screen drum. 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. If it is desired to change the timing of the sequences 310 to 316 in FIG. 3, this can be done by arbitrarily changing the positions of the diodes of the decoder. For example, 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 developed 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 80 counts of the third cycle. The present invention facilitates the selection by counting the discrimination pulse (2) using two insulated drum counters IC and IC' and comparing the count value with the memory (2), as shown in Fig. 4. be. In other words, the count is "1" from the second cycle.
47 insulated drum counter IC is activated, 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. After this, this counter will be stopped. However, for example, the timing roller clutch only operates on the first sheet of paper during the second cycle. However, if we compare the insulated drum counter IC with the memory (2), said counter will already be equal to the memory (2) in the third cycle, so no action of this clutch will take place for the second sheet of paper. This is inconvenient. Therefore, the present invention controls the on/off of the clutch by comparing the insulated drum counter IC', which counts up one count later than the counter, with the memory (2). The insulated drum counter IC matches the memory (2) in the third cycle in the case of FIG. 3 and stops counting, whereas the insulated drum counter IC' matches the memory (2) in the fourth cycle. Therefore,
In the fourth cycle, insulated 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, at the time of judgment pulse (2), the two counters are cleared, and the screen/drum counter and the latent It is checked whether the memories (1) storing the desired number of image formations match, and if they match, a copy end command is issued and the rotation of the drum is stopped. If they do not match, as described above, the insulating drum motor is turned off, the screen drum motor is turned on, exposure is started, and the same sequence after the formation of the primary latent image is repeated. FIG. 16 is a diagram showing an example of drive control of each device, 310, 312, 3
Reference numerals 14 and 315 are the paper feed roller clutch, pre-modulation charger, developing motor, and timing roller clutch in FIG. is an inverter, 162 is a NAND gate, 163 is a NOR gate, and 165 and 167 are AND gates. When each matching circuit determines whether the counter IC or IC' 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 is controlled at a predetermined timing. It is possible. Next, a case where the transfer paper is jammed will be explained with reference to FIG. In order to detect jams 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, the following is shown in Figure 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 (SGI), the light receiving element 70 picks up the pulse of the clock pulse generator, starts the jam counter, and when the leading edge of the paper blocks the light source 71 (SGO), the light receiving element 72 picks up the pulse of the clock pulse generator.
As a result, a separation confirmation detection pulse SDP is generated by decoding the output of this counter. 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 figure b. 8 in figure b
1 is a gate, and 82 is a flip-flop. Also, using this counter, the separation claw 73
It is possible to output a pulse signal from the same decoder to create the timing for activating (FIG. 1). The sequence control unique to the present invention after jam detection will be explained with reference to FIG. If you 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. During the repair, the counter display remains stationary, showing the number of counts at the time of the jam. When the repair is complete, press the START key again and the screen drum motor will rotate, rotating the screen drum to its home position. Then, at the home position, turn off the screen drum motor and turn on the insulated drum motor. Since the electrostatic latent image on the screen is retained during the jam repair, the sequence operation after the above-mentioned modulation is restarted. Timing details in 9th
As shown in the figure, in the sequence after modulation, the insulated drum requires one and a half revolutions (three revolutions of the screen drum), whether it is the first disc or the first disc after jamming and restarting. When restarting after a jam, the timing for the first sequence after modulation must be created while the insulated drum counters IC and IC' are 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, thereby controlling the sequence of the first sheet. And insulated drum counters 1 and 2
The count up is performed 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 first sheet is jammed, that is, when insulated drum counters 1 (IC) and 2 (IC') ≠ memory (2), it is jammed, when IC = memory (2), it is jammed, and IC' = memory (2). When Jiyam. The counter movement for restarting after jam is shown below. However, memory (2) = 4.

【table】

In the case of [Table], both IC and IC' count up from the third cycle. In this case, only IC' is counted up in the third cycle, IC=IC', and the process ends at the end of the third cycle. In this case, the count does not increase even after entering the third cycle, and at the end of the third cycle, IC=IC' is confirmed and the process ends. As a result, the cycle ends in the same way, but this is because the jam occurs near the paper leading edge detector due to "two-sheet feeding" or other reasons, and when the same paper is jammed due to poor paper separation, etc. However, the time difference between jams makes a difference. We will explain how to control the sequence using inhibit time 1, INH1 and 2, and INH2. In the sequence of restarting after jamming, the first copy must be copied in any case, so the prohibition time 1
Then, the functions 310 to 314 in FIG. 3 are turned on at appropriate timings. 315 is also 1・
Turn it on at the appropriate timing of INH2 time. Next, in the time of 1・INH2, 310,
311 is compared with the contents of the counter IC and memory (2), and if they are already equal, it is 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,
As with normal control, memory (2) and this
Controlled by comparison with two counters. The circuit that generates the above-mentioned inhibition time signals INH1 and INH2 is as shown in FIG.
182 is a flip-flop, 183 and 184 are gates, FRSTRT is a start signal related to the start of rotation of the insulating drum, FJ2 is a judgment pulse (2),
Gates 183 and 184 output INH1 and INH2 at the timing shown in FIG. The driving of the equipment and the stoppage of the counter during this prohibited time are controlled by a circuit as shown in FIG. The on and 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 FIG. 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 or off the flip-flops for latching the associated equipment. Since it is turned off, the 360-decimal counter is set 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 memory circuit consisting of two blocks, a diode matrix and an inverter. It becomes possible to control the sequence without using any. In Figures 10 and 11, Set FHVT5 commands the pre-modulation charger to turn on, Reset, FCL3 commands to turn off the drive of the paper feed roller, Set FCL4 commands to turn on the drive of the timing roller, and FRSTRT commands to start copying after modulation. FI∞ is used to determine whether it is a start or not, and whether or not it is multi-retention. 10th
The blank space in the figure can also be used to output operating commands for 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. This allows stable timing control without requiring a complicated configuration. 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 10th and 30th sheet.
Increase the potential step by step on the 1st, 50th, 70th, and 90th sheets. The potential can be raised or lowered by varying the primary input voltage of the high-voltage transformer. For example, using Figure 13 as an example, it is possible to increase or decrease the potential by connecting six resistors in series and using a relay, etc. that operates as the number of retention cycles increases. The potential is increased by sequentially shorting the . This resistor can be placed in series,
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 an insulated drum counter (1) and a modulated charger on-pulse. For example, in the case of this device, the 2nd, 10th, 30th, 50th
The potential changes at the 1st, 70th, and 90th sheets, so the first
As shown in Figure 5, the decoded output of the insulated drum counter (1) that gates the modulated charger on pulse is the timing to activate the relay.
Therefore, the second card is IC = 1, the 10th card is IC = 9, 30
The 1st card is IC=29, the 50th card is IC=49, the 70th card is IC=
The 69th and 90th sheets are the clock pulse when IC = 89.
At 80 counts, activation pulses for relays K1 to K6 are output, setting latches 1 to 6, and relay K
Activate coils 1 to K6. Next, a reasonable accounting method for 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.
In addition, deterioration of the photoreceptor is generally caused by the passage of current through the photoreceptor, so deterioration of the light source and screen photoreceptor mainly occurs during the process of forming the first electrostatic latent image, and does not affect subsequent processes. is almost unrelated. Therefore, in such a copying device, when accounting for copying fees, in addition to charging fees differently depending on the size and paper quality of the copy paper as in conventional copying devices, An accounting method is required that takes into account the difference between the process of forming a latent image 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, and 192 is a total counter that counts the number of times an electrostatic latent image is formed on the screen drum. Count 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). Other numbers are shown in Figure 2 (Operations). Corresponds to the numbers on the board block diagram). Let's explain its operation. When the count-up switch 241 is turned on and off each time the original image is exposed and an electrostatic latent image is formed on the screen drum, the counter 20
1 and the value of the total counter 191 increase by 1. 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. That is, when the original picture is replaced and the number of copies is newly set, the counter 201 starts counting again from 1 to 2, 3, etc., but the total counter 191 starts counting from the previous count value + 1. Furthermore, each time the count-up switch 242 in the process of forming a secondary latent image, developing it, and then 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 carried out, and the total counter 201 continues to count the total number of copied sheets 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 onto the copy paper are counted separately, and each total counter is calculated separately at the time of collecting copying charges. Make a profit. By accounting for copying fees as described above, 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 can be achieved. Ru. 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 a latent image formed on a photoconductor by exposure to light onto plain paper and develops it to produce a copy. It is effective in applications that utilize the so-called TESI method, as well as applications in which a secondary latent image on an insulating drum is directly transferred onto plain paper and developed to produce a copy. As described above, according to the present invention, the control signal from the memory is determined, image formation is sequentially controlled, and the stop signal and condition signal from the source are output at a predetermined time after the start of image formation and before feeding of the recording medium. By determining the signal for selecting the next sequence, if there is a stop input, the device stops at a predetermined point without feeding paper, or if there is no stop input and performs image formation, the next step is to Since the image forming operation is performed according to the sequence selection signal to proceed, it is possible to stop the apparatus with a simple configuration when there is a stop input. It becomes possible to perform the formation.

[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 diagram of the display in the copying machine according to the present invention, FIGS. 3a and 3b are time charts of equipment operation in the copying machine according to the present invention, and FIG.
The figure is a block diagram of the control unit of the copying apparatus according to the present invention, and FIG. 5 is a flowchart of sequence determination.
Figure 6 is an example of a circuit diagram embodying this, Figure 7 is a drive circuit diagram of each device, Figures 8a and b are time charts and circuit diagrams of jam detection operation, and Figure 9 is equipment after jam detection. A time chart of the operation, Fig. 10 is a more detailed flowchart of sequence judgment, Fig. 11 is an example of a circuit diagram embodying it, Fig. 12,
Fig. 13 is a graph and circuit diagram for correcting image quality changes due to retention copying, Fig. 14 is a time chart of the operation of Fig. 13, Fig. 15 is an example of the drive circuit of Fig. 13, and Fig. 16 is a diagram of the operation shown in Fig. 13. An example of the device drive circuit in Figure 3, Figure 17 is a cross-sectional view of the screen photoreceptor,
Figure 18 shows 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 the charger output control circuit, and Figure 21 is the 16th diagram using Figure 18.
This is an example of the signal generation circuit for the figure, in which 202 is the first memory, 201 is the screen drum counter, 203 is the second memory,
413 is a first insulated drum counter, and 414 is a second insulated drum counter.

Claims (1)

[Scope of Claims] 1. A paper feeding means for feeding a recording medium, an image forming means for forming an image on the recording medium, and a sequence to be performed next at a predetermined time after the start of operation of the image forming means. a condition signal generation source for generating a signal for selection; a stop input means for stopping the sequence after the image forming means starts operating but before the image forming means completes image formation; and controlling the image forming means in sequence. and a sequence control means for outputting a control signal for image formation, and a determination means for determining a signal from the memory means and outputting a sequence control signal. and detecting the presence or absence of a stop signal based on the stop input means and the sequence selection signal from the condition signal generation source at a predetermined time after the start of operation of the image forming means and before feeding of the recording medium, through the memory means. If it is determined that the stop signal is present, the apparatus is stopped at a predetermined point regardless of the selection signal from the condition signal generation source and without feeding paper by the paper feeding means, and the stop signal is not present. In this case, an image forming apparatus is characterized in that image formation is performed by selecting the next sequence to proceed to in accordance with a selection signal from the condition signal generation source.