JPS6150163A - Electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To shorten the first copying time to obtain normal images by detecting and confirming the initial position of an original scanning means or the like at a power-on time and performing required initialization to make the use of a copying machine possible. CONSTITUTION:After being set to the initial state at the power on time, a microprocessor 30 discriminates whether the initial position of a photosensitive body and that of the original running means are correct or not on a basis of a synchronizing signal, which a synchronizing signal generating part 37 outputs in every prescribed position of a recording medium during one rotation of the photosensitive body, and turn-on/off state of a relay contact, whichis sent through a microswitch for detecting the initial position of the original scanning means from a driving circuit 32, in accordance with instructions of an incorporated ROM. If initial positions of them are not correct, a required control signal is supplied to the driver 32 from the processor 30, and the photosensitive body and the original running means are set to prescribed initial positions; and when this setting is detected and confirmed by the processor 30, an initializing process is executed to make the copying machine usable. Thus, the first copying time is shortened, and normal image formation is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an electrophotographic copying machine that forms an original image on a recording medium to form a copy image.

<Prior Art> To briefly explain the operation of an electrostatic copying machine, a photoconductor, which is a recording medium with a photoconductive layer formed on the top surface of a conductive layer, is used. Performs charging. By exposing the photoconductive layer of the photoreceptor to a light image, an electrostatic latent image corresponding to the light image is formed on its surface. after that,
Toner is applied to the electrostatic latent image in a developing section to make it into a visible image. Then, the plain paper being fed is brought into close contact with the photoreceptor, the toner image is transferred to the plain paper, the plain paper is sent to the fixing section, the transferred toner image is fixed, and the paper is sent out to the exit. ing.

The above is a general dry type copying machine.

Here, the copying process, that is, the control of each process such as charging, exposure, development, transfer, fixing, etc., is performed by detecting the feeding state of paper at various locations, the rotational position of the photoreceptor drum, etc. as mentioned earlier. Microswitches and the like are appropriately arranged, and various controls are performed depending on the operating state of the microswitches.

In this case, the conventional control circuit is mainly complicated;
In addition, the number of wirings connecting the microswitch groups and the control circuits is equal to the number of switch groups, and the arrangement of these switches is not constant, which inevitably leads to complexity.

As the control circuit, if a large number of TTL-ICs are connected and charging is to be stopped depending on the operating state of the switch group, the control circuit outputs a charging section control signal, and the charging section is controlled via the driver circuit. I'm trying to get it to work.

As for the arrangement of the above-mentioned switch groups, it is very difficult to arrange them in a certain place because the switches are used as a detection means in terms of control or mechanism.

On the other hand, in a copying machine, a solenoid is used as a means for converting each detection signal, that is, an electrical signal for controlling, into a mechanical output, including an output signal when a paper jam is detected. The copying machine as a whole, including these solenoids, becomes a noise source for the electronic control circuit. Furthermore, it is clear that the complicated wiring and the fact that it requires a considerable line length make it susceptible to electronic noise sources. Moreover, the copying machine itself performs various operations such as charging, exposure, and movement of the document table in synchronization with the rotating drum of the photoreceptor, but the control circuit is controlled by operating status signals from a group of switches that enter asynchronously. However, the noise resistance was inherently weak.

In terms of time, the control of a copying machine is sufficiently long, from when the print switch is pressed to when the copy is made and when the original table is returned to its original position. The operating status of these switch groups can be confirmed in series.

By performing this parallel control in series, unnecessary wiring can be omitted, and the above-mentioned effect of increasing the margin in noise resistance becomes greater.

In order to achieve this, for example, one chip, one package (7) MOS-FET is used (7) A ROM-RAM type microprocessor is used to perform copy control.

The above microprocessor stores subdivided digital control and arithmetic circuits in read-only memory (Read-only memory).
0nly memory, ROM) The read/write memory (R
This is a processing device that operates including mutual transmission with ead'Write memory (RAM).

As mentioned earlier, the effective use of microprocessors in copying machines was briefly mentioned, but since the control time of a series of copying machines is long enough, it is possible to fully compensate for the disadvantages of processors in terms of processing time. Appropriate utilization will be made.

In particular, by using MOS-FET, power consumption is much lower than that of TTL, and the degree of integration is also improved, so it can be used efficiently.

In addition, by using a microprocessor to control the copying machine, the electronic control circuit can be significantly downsized. In other words, the conventional control circuit can be replaced with just one microprocessor. In order to improve serviceability, prevent the effects of external noise, and check various conditions of the copying machine, such as the detection status of a group of microswitches, serial control is performed, so interconnect wiring can be reduced. Furthermore, changes in peripheral devices and specifications expected in the future can be handled by modifying the ROM of the microprocessor itself, making it easy to make significant improvements compared to copiers using conventional control methods. The results are also great.

Regardless of the control of the microprocessor mentioned above,
As mentioned earlier, microswitches and the like for paper detection are placed as appropriate in the paper transport path that transports the paper to the transfer process and transports the paper to the fixing unit after transferring the developed image to the paper. ing.

This paper detection microswitch not only informs the microprocessor of the state of paper transport, but also is used to detect a defect in the paper transport state, that is, a jam. Paper is always transported at a constant speed along the transport path, so the time from when a microswitch installed in the transport path detects the paper until the paper passes the position of that microswitch indicates whether paper transport is normal or not. If so, it is considered to be constant.

Therefore, when the microswitch detects paper, a timer is activated, and if the microswitch continues to detect paper pressure even after the set time of the timer has elapsed, a signal is sent to the microprocessor sensor indicating a jam. In response to this jam detection signal, the copying operation is stopped at that point, and a message indicating a jam condition is displayed to notify the user.

Following this display, the user opens the copying machine main body, removes the jammed paper, and then performs an operation to clear the jam. As a result, when the main body of the copying machine is opened, power is turned on to the main parts and the copying machine returns to a usable state. At this time, the document table, photoreceptor, etc., which are means for optically scanning the document, remain stopped at the position where the jam occurred.

Therefore, if the print switch is operated while the copying machine is ready for use, the copying operation will be started after returning the document scanning means and the photoreceptor to the initial state, and the first copy will take one hour longer. Furthermore, if the photoreceptor, etc., which has a leading end and a trailing end, continues to rotate in a jam state and a copying operation is started, a normal image cannot be formed.

Purpose of the present invention The present invention is characterized in that the initial settings of the copying machine are performed based on turning on the power. In particular, the present invention is characterized in that the initial setting of the copying machine is performed when the power is turned on. The purpose of this method is to perform initial settings beforehand, to shorten the time required for first copying, etc., and to obtain a normal copy image.

<Example> Hereinafter, jam detection during a copying operation according to the present invention will be described in detail.

First, the configuration of the copying machine according to the present invention will be explained (In FIG. 1, 1 is a rotating drum that is rotated in the direction of the arrow ζ around a shaft 2 at a constant speed;
A master paper, that is, a photoreceptor 3 whose front surface is made of a photoconductor and whose back surface is made of a conductive layer is removably mounted on its outer peripheral surface. Although not shown in the drawings, the photoreceptor 3 is fixed to the outer circumferential surface of the drum 1 by being held down at its leading end by a presser claw attached to the surface of the rotating drum 1. When replacing the photoreceptor 3, the presser claw opens, the old photoreceptor is conveyed to the outside, that is, to the paper outlet 5, and a new photoreceptor 3 is inserted through the photoreceptor insertion port 4, and its tip is inserted into the presser claw. It is held down and fixed. This operation is automatically performed in conjunction with the rotation of the drum 1.

A microswitch MS7 installed near the photoconductor insertion slot 4 detects the insertion of the photoconductor 3. When this switch MS7 is turned on, the photoconductor 3 replacement cycle begins. The exchange is performed. The automatic replacement of the photoreceptor 3 is carried out by a conventionally developed and known mechanism in this dish device, and therefore a description thereof will be omitted. Various devices are provided near the rotating drum 1 to form an image corresponding to a document on the surface of the photoreceptor 3. In the figure, reference numeral 6 denotes a charger for uniformly charging the surface of the photoreceptor 3. The charger 6 generates a high voltage by energizing a charging high voltage generating unit CHVU as shown in the circuit diagram of FIG. 2, and the surface of the photoreceptor 3 is uniformly charged by this high voltage. The energization at this time is carried out by energizing the charging relay and closing its contact CHV R-a.

Reference numeral 7 denotes an exposure section, which illuminates the charged photoreceptor 3 with a light image 11.
A JJ'L electrostatic charge latent image is formed. In this exposure, the transparent glass surface of the original platen 8, which is a scanning means for the original on which the copy original is placed, is irradiated by the illumination device 9, and the reflected light is reflected by the optical system l.
This is done via O.

Here, the document table 8 is configured to move in synchronization with the rotating drum 1 in order to optically scan the placed document. That is,
The movement of the document table 8 is started at the same time as the photoreceptor of the rotating drum 1 comes to the exposure section 7, and the moving speed at this time is naturally equal to the rotational speed (peripheral speed of the drum 1).

Reference numeral 11 denotes a developing device for visualizing the electrostatic latent image, which attaches toner to the area where the electrostatic latent image is formed to form a toner image.

Reference numeral 12 denotes a transfer charger for transferring the toner image to the transfer plate i13. The transfer paper 13 is automatically fed by a paper feed roller 20, conveyed into the copying machine by a 10th roller 21, and fed through each roller in synchronization with the rotation of the rotary drum l. The paper feed is temporarily stopped by a paper stopper 14 provided in the paper input section.The microswitch MS provided in the paper input section is used to detect the paper input state. , this micro switch M
When the rotary drum 1 rotates to a certain position while the SI is detecting a person's identification, the stop 7 pawl 14 opens and the transfer paper 1 is removed.
3 is fed, synchronized with the rotating drum I at good timing, and brought into close contact with the photoreceptor 3 on which the toner image has been formed. Then, the toner image is transferred to the transfer paper 13 by being charged by a transfer charger 12 (a iron).

Reference numeral 15 denotes a device for peeling off the transfer paper 13 from which the toner image has been transferred, which has been brought into close contact with the photoreceptor 3 of the drum I, and transporting it.

When the transfer paper 13 is peeled off from the photoreceptor 3, a peeling device 15
At this point, the material is attracted to a conveyor bell (15a) by air suction force (direction indicated by an arrow) and sent to the next process. A microswitch MS2 provided near the peeling device 15 detects that the transfer paper 13 is peeled off.

Here, the toner image transferred to the transfer paper 13 is still in an unstable state and is not completely fixed on the transfer paper 13.
It is necessary to fix the toner.

This means that the transfer paper 13 is transferred to the conveyor belt of the peeling device 15)1.
5a, and sent to a fixing section 16, where the toner image is fixed.

The toner fixing section 16 is provided with a heater lamp HL serving as a heat source, and this heat source F performs heat fixing. or,
There is an optimum temperature range for fixing the toner in the fixing section 16, and unless the temperature rises above this temperature, the copying operation will not be executed. The above temperature is about 300°C. Further, the transfer paper holder I7 of the fixing unit 16 is at the position shown by the solid line Cζ when the power is turned on, and at the position shown by the dotted line when the power is turned on.

Microswitch MS8 detects this state. The reason why this pedestal 17 is moved as shown by the dotted line when power is no longer supplied is because, for example, when a transfer paper jam occurs in the fixing unit 16, the power supply unit is opened and the fixing unit 1
This is to prevent the transfer paper 13 from igniting at step 6, and is kept away from the heater lamp HL to facilitate removal of the transfer paper 13.

The transfer paper 13 conveyed within the fixing section 16 is conveyed out from the paper outlet 5 by the rotation of the conveyance roller 22. A microswitch MS3 provided near the paper outlet 5 detects this paper output. Note that 23 is for detecting slip roller jam, and roller 23a is used as a driving roller 2(
b is a driven roller, and the roller 13b is a driven roller.
3 is conveyed normally, the rotation of the drive roller 23a is transmitted, but if it is not conveyed normally, for example, a jam occurs, the rotation is not transmitted, and the jam is detected. There is.

On the other hand, the reference numeral 18 in the figure is a static eliminator for removing static electricity from the transfer paper 13, and unlike the other chargers 6 and 12, the static electricity removal is performed by AC corona discharge. Although the photoreceptor 3 is not shown in the figure, its static electricity is removed by the light beam from the heater lamp HL.
The surface is cleaned by a cleaner brush 19 and prepared for the next electrostatic latent image formation.

Here, both the static eliminator 18 and the transfer charger 12 perform static elimination and charging for transfer by corona discharge when the high voltage generation unit TI (VU is energized), and the high voltage To energize the generator THVU, the relay is turned on by the control signal from the control circuit, and its contact THVR-a is turned ON.
Executed when the file is opened.

Further, the document table 8 starts moving (feeding) in synchronization with the movement of the rotary drum 1 to reach a predetermined rotational position, and returns to the original position when the movement exceeds a predetermined length (hereinafter referred to as overrun). controlled. Therefore, the initial stop position of the original platen 8 is detected by a microswitch MS4 provided opposite to the actuating piece 8a that is interlocked with the movement of the original platen 8.
The overrun of the original A platform 8 is detected by the microswitch MS5 provided opposite the microswitch MS4.

In the general copying machine constructed as described above, various mechanisms are controlled, for example, by driving the rotary drum 1, feeding and returning the document table 8, transporting the transfer paper, and controlling the chargers 6, 12, the static eliminator 18, etc. Microprocessor consisting of a chip
controlled by. A series of operations of the copying machine configured as shown in FIG. 1 will be briefly explained.

First, if you turn on the power switch MSW, the main motor M
M rotates. Also, contacts P R-a and b (see Figure 2) of the power relay are closed, and the heater lamp HL2 is closed.
, HL3 is turned on to raise the temperature of the fixing section 16,
When the temperature reaches a predetermined temperature or higher, a copying permission display is displayed to enable use of the copying machine. Therefore, print switch P
When SW is pressed, the rotating drum 1 rotates, and in synchronization with this, various mechanisms operate depending on the operating state of each microswitch. Therefore, when the rotating drum 1 reaches a certain position, the light source lamp CL of the illumination device 9 is turned on, the surface of the photoreceptor 3 is charged by each charger, and the document table 8 starts moving. On the other hand, if the microswitch MS detects paper entry, the paper stopper 4 opens in synchronization with the rotation of the drum 1, and the transfer paper 3 is transported by the transport roller 21-.

On the other hand, an electrostatic latent image is formed on the photoreceptor 3 at the exposure section 7, and this latent image becomes a toner image at the developing device 1'1 and is sent to the transfer section for the next step. The transfer paper 13 conveyed to the photoreceptor 3 is brought into close contact with the photoreceptor 3, and the transfer charger 12
At , the toner image is transferred onto the transfer paper 13. Thereafter, the transfer paper on which the toner image has been transferred is peeled off from the photoreceptor 3 of the drum L, and in the peeling device 15, it is attracted to the conveyor belt 15a by air suction force, and the static electricity is removed by the static eliminator 18, and the heater lamp HL The image is transported to the fixing section I6, which has a built-in image forming apparatus. Then, the transfer paper 13 is conveyed within the fixing section 16 and is conveyed to the outside from the paper output port 5 by a feed roller 22.

As the drum 1 rotates, the surface of the photoreceptor 3 is neutralized by light beams from the heater lamp HL of the fixing section 16, and passes through a cleaner brush 19 to be neutralized and cleaned, and is ready for forming the next electrostatic latent image. Further, the document table 8 is in an overrun state, and when this state is detected by the microswitch MS5 and returned to the original stop position, the switch MS4 that detects this operates and stops. Also, rotating drum 1
will also stop at the first stop position. In this case, the number of copies is one, and in the case of multiple copies, the above-mentioned operation is repeated several times and the copying operation stops after a predetermined number of copies have been made. For example, when making multiple copies, a multi-copy dial is set and the copying operation is stopped when this dial reaches 0. This is detected by the microswitch MS6 installed in the multi-copy dial section. It is.

In order to operate and copy as described above, the control of the present invention is performed by a microprocessor. FIG. 3 is a control block diagram of the copying machine according to the present invention.

In FIG. 3, 30 is a microprocessor (hereinafter referred to as a control element) consisting of one chip and one package;
The control signal 31 from the control element 30 energizes the solenoids, relays, etc. involved in the copying operation via the driver circuit 32 (hereinafter, when energized is written as I Q N I +, and when not energized it is written as "OF"). .)I do. For example, when the drum feed clutch DFC is turned on, the rotating drum 1 starts rotating. In order to control these various solenoids, relays, etc., a synchronization signal 33 for controlling the copying operation accompanying the rotation of the drum l is inputted to the control element 30, and the synchronization signal 33 is used to control the copying operation as explained in FIG. A signal 35 (hereinafter referred to as a strobe signal) is derived from the control element 30 to confirm the detection state of the microswitch group 34 that detects various copying operations.

By applying this strobe signal 35 to a group of switches, etc., and inputting its output to the control element 30, the current state of each microswitch 1 can be recognized. Combining the confirmation state at this time and the synchronization signal 33, the control element 30
The control signal 31 as described above is outputted to control the copying of the copying machine.

The synchronization signal 33 input to the control element 30 is
The signal is generated by the signal generator 37 by the rotation of the rotating drum l corresponding to the running of the signal. In other words, the synchronization signal generator 37
A disc 24 shown in FIG. 4 is provided on the same axis as the shaft 2 of the rotating drum l as shown in FIG. A photoelectric conversion device consisting of a light-emitting element and a light-receiving element is arranged in each of the elements. Therefore, a signal 33 synchronized with the rotation of the drum 1 is output from the synchronization signal generator 37. In addition, the position indicated by the arrow in FIG. 4 is the initial stop position of the rotating drum I. Also, in this state, a synchronization signal is obtained via the slits Pa-0 and Pb-1.

38 in the figure is a signal generation source for setting the control element 30 to an initial state, and the control element 30 is activated when the power of the copying machine is turned on.
is set to the initial state.

Reference numeral 39 denotes a WTL level control circuit which controls the temperature in the fixing section 16 and keeps the temperature constant by controlling two heater lamps HL2 and HL3. The output from this circuit is input to the control element 3Q, and if the output from the circuit 39 is a logical value "'1"', the temperature of the fixing section I6 has reached the specified value, and the logical value II
If OI+, it is assumed to be less than the specified value and is input as the control element name O.

Furthermore, 40 is a circuit for detecting a slip roller jam. That is, if an abnormality occurs in the operation of the roller 23 described in FIG. 1, it is detected and a signal indicating the state is input to the control element 30. .

In short, if the logic value is II I I+, it is a signal indicating that a jam condition has been detected, and if the logic value It OI+ is a signal indicating normal operation.

The control element 30 includes a ROM that stores various instructions for controlling the copying operation described in FIG.
Including means for reading instructions from ROM,
It has a processing circuit that processes and executes the read instructions to generate and output a control signal 33 to the driver circuit 32, and a RAM that can store and input information required by the processing circuit. and outputs a control signal 33 to the driver circuit 32.

That is, the processing circuit receives a signal from a detection means 34 for detecting a copying operation such as an original platen, a transfer sheet, etc., corresponding to a synchronization signal 33 that is sequentially input in accordance with a copying operation, and determines the control state of the controlled section. Create control signals to drive each solenoid, relay, etc. The processing circuit checks the input of the synchronization signal and the detection state of the detection means 34 based on the read instructions, and generates a control signal based on these checks. Further, the processing circuit also controls an address register and the like for reading instructions stored in the ROM based on the read instructions. In order to drive controlled parts such as the drum feed clutch DFC, control signals generated by the processing circuit are temporarily stored in the RAM. Further, the control signal stored in the RAM is transferred to an output means for outputting to the outside, and sent to the driver circuit 32 in parallel via this output means. That is, according to the present invention, the detection means is sequentially checked in accordance with the input synchronization signal, and the control signal is output in parallel to control the controlled section.

To briefly explain the operation of the block diagram shown in FIG. 3, the main motor M rotates by closing the power supply/switch MSW shown in FIG.
By inputting the signal from 8, the control element 30 is set to an initial state. Thereafter, the drum 1 and the document table 8 rotate and move, respectively, and stop at the stop positions. Now, if the signal from the WTL circuit 39 is '1'', when the print switch PSW is pressed, the control signal @31 is output from the control element 30 and sent to the drum feed clutch DFC via the driver circuit 32.
is turned on, and the rotating drum l rotates. A synchronization signal 33 is input to the control element 30 by this rotation of the drum l. Therefore, the control element 30 derives a strobe signal 35, checks the operating state of each microswitch, etc., and outputs the control signal 31 at that time to the driver circuit 32. In this case, the control signal is stored in the RAM, and the copying state up to that point is stored. Based on the control signal 31, a solenoid, a relay, etc. is controlled to turn on, charge, or move the document table via the driver circuit 32, and copying operations are sequentially performed.

Next, the initial settings of the copying machine according to the present invention will be explained. That is, in the present invention, when power is turned on to the main parts of the copying machine, the copying machine is set to be usable after returning the document table 8 and the photoreceptor 3 to their initial positions.

When turning on the power, turn on the main switch MSW,
If you open the copier door when there is a jam, the switch D
When the SW is opened, the power supply to the main parts is cut off, and when the door is closed after clearing the jam, the power is turned on again. FIGS. 5 and 6 are flowcharts showing the usable state of the copying machine after the initial setting of the copying machine from when the power is turned on.

The r'a' control operation of the present invention will be explained in detail below with reference to FIGS. 5 and 6. First, when the power of the copying machine is turned on, in the circuit diagram shown in Figure 2, the main motor M M
Power is supplied to M and M rotate. Further, the control element 30 is set to an initial state by a signal associated with power-on. In other words, the contents of RAM are all set to 0'' (this is set).
Perform 5t jersey. This Te5t judgment is used to check whether each operation can be reliably executed after manufacturing the copying machine according to the present invention1, and in the present invention, all determinations are made as -No.

As explained above, when the <Te5t judgment is completed, the contact JR-a of the jam relay JR is judged next. If a jam of transfer paper or the like occurs, the contact JR-a closes to notify the user of the jam. For convenience of explanation, the jam relay JR is not operating and its contact JR
-a is assumed to be open.

In this case, the above-mentioned judge determines NO, and judges the next microswitch MS. This microswitch MS must not be detecting paper.
Therefore, the next microswitch MS2 is judged. Here, the above microswitches MS and MS2
If it is judged as Yes, it is a jam (J AM)
will be processed as

Here, jam processing will be explained. When a jam is detected, the jam processing is executed according to the flow shown in FIG. First, all loads on the copying machine are turned off. Next, at the judge of contact JR-a of the jam relay, check until this contact JR-a operates and falls to the NO side.
After checking, turn off the jam relay JR. Then, the jam lamp timer JLT is reset to tt O++, and the judgment of the contact JR-a is executed again. In this case, it is determined as Yes and the process moves to the next operation. Therefore, the jam lamp timer JLT is started and the judgment of the jam lamp timer JLT is executed. Therefore, in the judgment of the jam lamp timer JLT, after a predetermined period of time has elapsed, it is determined as Yes, and the jam lamp JL is ONL, indicating that there is a jam, and further setting the flip-flop.

Thereafter, the above-described operation of resetting the jam lamp timer JLT and starting the hind leg timer is repeated. Then, if the judgment of jam and lamp timer JLT is YES, the judgment moves to flip 70. Here, since the flip-flop is sected above, the jam lamp JL is turned off,
The lamp goes out.

Furthermore, the flip-flop is reset.The subsequent operation is the same as described above, and by repeating this operation, the jam lamp JL will blink at each set time of the jam lamp timer JLT, indicating that there is a jam. The above setting time is, for example, 500 m5ec.

In response to the above jammed paper display, the user opens the front door of the copying machine main body to remove the jammed paper. At this time, when the door is opened, the door switch DSW opens and the power supply is cut off.

When the user removes the jammed paper, the user releases the manual jam relay JR, and when the user closes the door, the door switch DS
W is closed and power supply is resumed. This returns the process to the step of initializing the control element 30 described above.

Returning to the original explanation, the microswitch MS2 is used to detect the separation of the transfer paper 13 from the photoreceptor 3, and is not operating in this state, and is determined to be "NO". Next, Micro Sinch Ms8 will be judged.

This micro switch MSg detects the pedestal 17 of the fixing unit 16, and as mentioned earlier, when the power switch is turned on, the pedestal 17 rises and this is detected. Therefore, when the microswitch MS8 is determined to be NO, that is, it is determined that the rise of the pedestal 17 cannot be detected, the microswitch MS8 is judged again. Therefore, Microsinch MS8 is
If it is judged as s, then C5S'R is judged. In this C5SR, when the photoreceptor 3 is replaced, the set of the relay C35R is turned ON.

In this case, the relay C55R is not tilted to the No side and is determined to be "NO". If C55R is No, then a control signal for turning on the power relay PR is output from the output section of the control element 30. After turning on the power relay PR, perform the Te5t judge, and after judging the WTL, turn on the heater lamp relay HLR and turn off the ready lamp RL.

The drum feed clutch DFC will be turned on.

As a result, the drum l rotates, and the heater lamp HL2
, HL3 and HL are also turned on and act to increase the temperature in the fixing section.

The reason why the rotary drum 1 rotates is to set the initial state of the drum 1, that is, the initial state of the copying machine.

Therefore, if the copying machine is in the initial state and WTL is Yes, the print ready state will be displayed and the print switch PS will be displayed.
Pressing W moves on to the copy cycle, but for convenience of explanation, this will be explained according to the flowchart in FIG. In the flowchart of FIG. 5, the D flip-flop is reset. This D flip-flop is a flip-flop in the RAM, and the flip-flop is specified in the RAM. These flip-flops provide information necessary for processing by the processing circuit, and are used for setting the timer circuit, changing the photoreceptor, and the like. In the current state, all flip-flops are in a reset state. D above
After resetting the flip-flop, the wait time level WTL is judged. This is determined as Yes if the temperature is higher than a certain set temperature, and the heater lamp relay HLR is turned off and the micro switch MS is turned off.
Judge 4. In other words, if the temperature is not higher than the temperature specified by WTL, the heater lamp relay HLR remains ON.
The temperature is further increased using three heater lamps HL-HL3.

On the other hand, the microswitch MS4 detects the initial stop position of the document table 8 as described in FIG. 1, and if the document table 8 is in the initial state, the determination is YES. Therefore, the document table return solenoid TR
Turn S off and judge microswitch MS7. The document table return solenoid TR5 is for returning the document table 8 to its original position, and conversely, the TFC is for moving the document table 8.

Furthermore, the microswitch MS7 is used to detect the paper input of the photoconductor 3 when replacing the photoconductor 3, and as shown in FIG.
o, and the photoconductor stopper solenoid MSS is turned OFF. After that, Slip Roller Jam SRJ will be judged. This SRJ is detected by the roller 23 described in FIG. 1, and its signal is inputted to the input section KF of the control element 30 from the slimp roller jam detection circuit 40 shown in the block diagram shown in FIG. Therefore, in this case, it is determined as No, and the synchronization signal PB is judged.

In the flowchart of Figure 7, if the PB judge is
If it is judged as s, then the FA will judge. Here, if there is no FB input, the microswitch MS4 is judged after the WTL is judged. Microswitch MS4 detects whether or not the document table 8 is at the initial position. If the initial position of the document table 8 is not detected, the table return read/drive TR5 is turned on after this MS judgment. Ru. When the solenoid TR5 is turned on, the document table 8 is driven to the initial position and returned to the initial position. That is, when the microswitch MS4 detects that the document table 8 has returned to its initial position, the solenoid TR5 is turned off, and the document table 8 is initialized.

When the above PH judgment is Yes, that is, when the synchronization signal PB-1 is input to the control element 301, PA is set at 2 times (Pa-11 and Pa-0 shown in Fig. 4).
When detected, the drum 1 is determined to be in its initial state, and an operation is performed to stop the rotation of the drum. That is, PB is Ye
If the synchronizing signal PA-11 is input to the control element 30 in the state s, the judgment of PA is Yes, and the process moves to the judgment of flip-flop D. However, PA is N
If the decision is made as o, the wait time level WT is set again.
Judge L. Therefore, if PA is judged as Yes, the judgment moves to the D flip-flop, but this D flip-flop is not set (1''') and judged as NO. Next, the D flip-flop is set (l''). ”) will be done. After checking the WTL again, the input state of PA-0 is checked. Therefore, if the synchronization signal PA-0 is input to the α terminal of the control element 30, the PA judge determines Yes. At this time, if the next D flip-flop is judged, it will be determined as Yes since the D flip-flop has been soldered earlier. After completing the above operation, A
Although the flip-flop is judged, the A flip-flop is in the reset state and is judged as NO, and the next B flip-flop is similarly judged as NO.

Based on the above, the high pressure generation relay THVR and the drum feed clutch DFC are then turned off. The above-mentioned relay THVR is as explained in Fig. 1, and the relay THVR
When turned on, charging is performed by the charger 12°18. Relay THVR has been in the OFF state since the power switch MSW was turned on, while feed clutch DFC has been in the ON state.
Then, the drum l stops rotating. As will be explained later, the rotation of the drum 1 starts no matter what state the drum 1 is in when the power is turned on, and stops when the drum 1 rotates to the initial position (that is, it stops). , the synchronization signal PA input to the α and β terminals of the control element 30.
, FB is used to stop the drum l.

To briefly explain what has happened so far, when the power is turned on, the inside of the control element 30 is set to the initial state, and the power relay P
Turn on R and turn on the heater lamps HL and HL of the fixing section 16.
Turn on 3. Also, the drum 1, document table 8, etc. are set to the initial state. Note that the heater lamp HL2 of the fixing section 16
, if HL, other than HL3, is the heart, heater lamp H
Heater lamp relay HLR is turned on to light up L.
do.

This state is stored in RAM.

When the copying machine is set to the initial state as described above, instructions are sequentially read out from the ROM and various copying controls are executed in order to perform the next operation.

When the power is turned on and the initial state is set, the microswitch MS4 is first judged in the flowchart of FIG. As explained above, the MS4 judge judges Yes. Therefore, set the document table return solenoid TR5 to 0FF (previously 0FF).
FF) and judges the slip roller jam SRJ and the microswitch MS2.The judgment is NO in both cases. On the other hand, if the microswitch MS2 operates in this state, it is treated as a jam.

Next, PB is judged, but since the rotary drum 1 is in its initial state, this synchronization signal PB is naturally inputted to the input section β of the control element 30, and it is determined as Yes.

Incidentally, if the above-mentioned FB judge determines NO, the drum feed clutch DFC is turned on and the above-described operation is performed in order to search again for the initial position of the rotating drum I.

After the above, the WTL is judged. Here, the fixing unit 1
If the temperature at 6 is above the specified value, WTL is Yes.
However, if it is below the specified value,
If NO is determined, the heater lamp relay HLR is turned on, the ready lamp RL is turned off, and the same operation described above is repeated.

Then, when the temperature of the fixing section 16 rises and becomes equal to or higher than the specified value, the wait time level detection circuit 39 inputs a signal that is "Pabi" to the input section KN, so that W T L becomes Ye.
s, and the heater lamp relay HLR is set to O.
Becomes FF. After that, microswitch MS4 turns Ye
TR5゜CHVR, THVR, C
LR is turned OFF. Here, CLR is a relay for the light source lamp of the illumination device, and when the relay is turned on, the lamp CL (see FIG. 2) lights up, illuminating the document table 8.

As the next operation, the preheat PH is judged, and after setting a 2-minute timer, the F flip-flop and microswitch MS are judged, and then the ready lamp RL is turned on. In other words, the copying machine has a drum 1 (photoreceptor 3), an original platen 8
After the initial setting, the reso I-lamp RL is turned on to indicate that it is ready for use. If the print switch PSW is operated while the lamp RL is turned on, the copying operation is started. In this case, since the drum and document table 8 are set at the initial position, the copying operation can be performed immediately and a normal image can be formed on the photoreceptor 3.

Effects> Since the present invention enables the copying machine to be used after initializing the recording medium and the means for scanning the original when the power is turned on, the copying operation starts immediately upon receiving the copying operation start signal. This allows you to shorten the first copy time by one hour. Furthermore, since the recording medium and document scanning means are initialized even after the jam is cleared, a normal image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the structure of the copying machine of the present invention, FIG. 2 is a circuit diagram of the power supply section, FIG. 3 is a control block diagram of the copying machine of the present invention, and FIG. FIGS. 5 and 6 are a front view showing a disc for outputting a synchronization signal in accordance with the flowchart of the control operation of the present invention,
FIG. 7 is a flowchart of jam processing based on jam detection. 1 drum, 3: photoreceptor, 8: document table, 24: synchronization disk, 30: control element, 33 (FA, PB) two synchronization signals, D
FC Nidrum feed clutch, TR5: Table return solenoid, MS4: Micro switch for detecting the initial position of the original platen.

Claims (1)

[Claims] 1. A document scanning device for optically scanning a document to be copied; a recording medium onto which the document image scanned by the document scanning device is projected; a first device for detecting the initial position of the document scanning device; a detection means, a second detection means for detecting the initial position at which the operation of the recording medium starts, and a detection state of the first and second detection means is confirmed by turning on the power of the apparatus, and the initial position of the document scanning means and the recording medium is confirmed. An electrophotographic copying machine characterized by comprising a control means that enables the device to be used after setting.