JPH0137736B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording apparatus that records necessary information on conveyed recording paper using an electrophotographic recording method.

Generally, in this type of recording device, recording paper is conveyed on a conveyance path at a constant speed, and information is recorded by matching the timing of the conveyance speed of the recording paper and the time for writing information to the recording section. This enables high-speed information recording. By the way, in such a recording apparatus, there is a normal mode recording paper conveyance control that continuously conveys the recording paper fed onto the conveyance path, and a recording paper conveyance control in the normal mode that continuously conveys the recording paper fed onto the conveyance path. The recording paper conveyance control is performed in a standby mode in which the recording paper is stopped and conveyed. In other words, the recording paper conveyance control in standby mode deals with cases where the time required to write information to the recording section is not constant due to an increase in the amount of information or due to the method of use. It is now possible to synchronize the timing of information recording with respect to the recording paper. However, during the recording operation based on the recording paper conveyance control in standby mode,
If the recording start signal for writing information to the recording section is not input for some reason, the recording paper remains stopped at a fixed position on the conveyance path.
Recording becomes impossible. Moreover, in this case, the photosensitive drum, fuser, etc. are operating continuously, and to cancel this state, it is necessary to forcibly input a recording start signal or turn off the power, which requires the operator to It is very troublesome.

This invention has been made in view of the above circumstances, and its purpose is to eliminate the inconvenience that occurs when a recording start signal is not input during a recording operation based on recording paper conveyance control in standby mode. The present invention provides a recording device that can improve reliability.

An embodiment of the present invention will be described below with reference to the drawings. In Figure 1, 1 is the main body of the electrophotographic recording device, which transmits the necessary video signals (recorded information).
An optical fiber cathode ray tube (hereinafter abbreviated as OFT) 2 is provided.
The OFT 2 scans and exposes the photosensitive drum 3, which rotates in the direction of the arrow in the figure, based on the supplied video signal, and forms an electrostatic latent image on the photosensitive surface 3a of the photosensitive drum 3. The photosensitive drum 3 is
Prior to scanning exposure by the OFT 2, the photosensitive surface 3a is charged in advance by a charger 4. The electrostatic latent image formed on the photosensitive surface 3a is visualized by applying a developer with a developing device 5, thereby causing an image to appear on the photosensitive surface 3a. The developing device 5 includes a tank 5 ₁ in which toner is stored and a developing chamber 5 ₂ in which the toner in the tank 5 ₁ is replenished. The bottom surface of the tank 5 ₁ and the ceiling surface of the developing chamber 5 ₂ communicate with each other, and the communication portion is connected to a toner replenishing roller 6 provided at the bottom of the tank 5 ₁ and a scraper that slides on the circumference of this roller 6. It is closed by a rod 7. The roller 6 is made of, for example, a porous elastic material. Therefore, roller 6
When the roller 6 rotates, the toner existing in the holes of the roller 6 is scraped off by the scraping rod 7 and replenished to the developer in the developing chamber ₅₂ .
A developing roller 8 that slides into contact with the photosensitive surface 3a of the photosensitive drum 3 is provided in the developing chamber ₅₂ , and the developing roller 8 causes the developer to adhere to the photosensitive surface 3a. ing.

On the other hand, the recording paper P in the paper feed cassette 9 is supplied to a conveyance path 11 by a paper feed mechanism, that is, a paper feed roller 10. In this case, transport path 1
1 includes recording paper P supplied from the paper feed cassette 9.
A paper feed detector 12 is provided to detect the paper feed. The recording paper P supplied to the conveyance path 11 is conveyed between the photosensitive drum 3 and the transfer charger 14 by conveyance rollers 13, 13. At this time, the toner attached to the electrostatic latent image on the photosensitive surface 3a is attracted to the recording paper P charged by the transfer charger 14. Thus, an image corresponding to the video signal supplied to the OFT 2 is transferred onto the recording paper P. Then, the recording paper P after the transfer is peeled off from the photosensitive surface 3a by the peeling charger 15, and is passed through the conveyance path 16 by the conveyance rollers 17, 17, 18,
18 to be conveyed to a fixing device 19. In this way, the transferred image is heated and fixed on the recording paper P by the fixing device 19, and then the recording paper P is heated and fixed by the paper ejection roller 2.
0 and 20, the paper is discharged onto a tray 21 on the front side of the main body 1. In this case, a discharged paper detector 22 is provided at the discharge end of the conveyance path 16 to detect recording paper P about to be discharged onto the tray 21 . However, the conveyance rollers 13, 1
3, 17, 17, 18, 18 and paper ejection roller 2
The recording paper P on the conveyance path 11, 16 by 0, 20
A conveyance mechanism is constructed for this purpose.

Furthermore, the developer remaining on the photosensitive surface 3a after the transfer is completed is removed by a cleaning section 23. The cleaning section 23 removes the developer on the photosensitive surface 3a by means of a cleaning roller 24 that is in sliding contact with the photosensitive surface 3a, and collects it on a filter 26 by the dust suction effect caused by the rotation of a fan 25. be.

Note that a control section 30 is provided within the main body 1 to control the operations of the various devices described above.

FIG. 2 shows the control circuit. That is, a recording start signal START for starting a recording operation, a standby signal SBY for performing recording paper conveyance control in standby mode to be described later, an output signal from the paper feed detector 12, and an output from the discharge paper detector 22. The signals are each supplied to a select circuit 31. The signal selected by this select circuit 31 is transmitted to the central processing unit, so-called
It is designed to be supplied to the CPU 32. this
The CPU 32 includes a storage section, for example, a random access memory (hereinafter referred to as RAM) 32 ₁ having a plurality of storage areas, and an arithmetic processing section 32 ₂ .
Various command signals are output based on the results of arithmetic processing of various signals supplied from the select circuit 31 and the contents of the RAM 32 ₁ , and the contents of each storage area of the RAM 32 ₁ are sequentially shifted based on the results of the calculations. It is something. In this way, various command signals output from the CPU 32 are transmitted to the select circuit 31, the latch circuit 33, the drive circuit 34 for the paper feed roller 10, and the drive circuit 3 for the transport rollers 13, 13.
5. Drive circuit 36 for developing roller 8, transport roller 1
7, 17, 18, 18 and paper ejection rollers 20, 2
A motor drive circuit 37 for driving a motor for operating 0, a JAM control circuit 3
8 and an alarm (ARAM) control circuit 39, etc., respectively. in this case,
The latch circuit 33 generates a standby signal for waiting operation in response to a command from the CPU 32 and an information write signal for causing READY and OFT 2 to supply a video signal according to required information.
It latches and outputs each PST.

Next, the operation in the above configuration will be explained. First, the flowchart in Figure 3, and the flowchart in Figure 4.
Recording paper conveyance control in the normal mode will be explained with reference to a transition diagram of each storage area of the RAM 32 ₁ and a time chart in FIG. In the standby state, the routine WA shifts the contents of each storage area of the RAM ₃₂₁ . In other words, the contents of area F ₀ are converted to area F ₁ ,
Shift the contents of area F ₁ to area F ₂ and the contents of area F ₂ to area F ₃ . Furthermore, the contents of area C ₀ are converted to area C ₁ ,
The contents of area C ₁ are transferred to area C ₂ , and the contents of area C ₂ are transferred to area C _3.
Shift to. In this case, the area F ₀ of RAM32 ₁ ,
The contents of F ₁ , F ₂ , and F ₃ are conveyance information of the recording paper P in the conveyance paths 11 and 16, for example,
This serves as a flag to indicate whether or not recording paper P is present. Also, RAM
The contents of areas C ₀ , C ₁ , C ₂ , and C ₃ of 32 ₁ are as follows:
The conveyance information of the recording paper P in the conveyance paths 11 and 16, for example, serves as a counter that counts the conveyance time of the recording paper P in the conveyance paths 11 and 16.
In this way, area F ₀ and area C ₀ , area F ₁ and area C ₁ ,
Region F ₂ and region C ₂ and region F ₃ and region C ₃ form pairs, respectively, and the 4 is sequentially transported on the transport paths 11 and 16.
It is compatible with up to 1 sheet of recording paper.

Thus, routine WR is executed. In this routine WR, the latch circuit 33 outputs the standby signal.
Latch READY to wait for recording operation. Furthermore, it is checked whether the standby signal SBY and the recording start signal START are being inputted, and if not, the checking operation is executed at fixed time intervals (DELAY) by loops 50, 51, and 52. This waiting state corresponds to a time of 1 WA. When the recording start signal START is input, the contents of the area F ₀ of the RAM 32 ₁ are set to "1" and the contents of the area C ₀ are set to "0". At the same time, the latch output of the latch circuit 33, that is, the standby signal READY is released. Then, the routine moves to ST.

In this routine ST, the drive circuits 34, 35,
An operation command is given to 37. Then, the paper feed roller 10, the conveyance rollers 13, 13, 17, 17,
18, 18, paper ejection rollers 20, 20, etc., respectively operate. That is, the first recording paper P ₁ is fed to the conveyance path 11 by the paper feed roller 10 .
Then, it is checked whether the detector 12 is on or not using the supplied recording paper _P1 .
If it is not on, the check operation is executed at regular intervals. At this time, the area of RAM32 ₁
I am trying to increment the contents of C ₀ ,
If the contents of the area C ₀ have reached the set value "a", that is, if a certain period of time (DELAY x a) has passed since the first sheet of recording paper P ₁ was supplied to the conveyance path 11, It is determined that there is a paper jam, and the jam control circuit 38 stops the operation. In addition, in this case, routine WA1 is executed every fixed period of time (DELAY).
Execute. This routine WA1
1 and 16, but in this case, since there is no other recording paper P other than the first supplied recording paper P ₁ (the area of RAM 32 ₁ Since the content of _F1 is "0"), the program returns to the original routine via loop 51. Therefore, the operation of routine ST corresponds to time 1ST. In this way, when the detector 12 is turned on, the contents of the area C ₀ of the RAM 32 ₁ at this time, for example, "x ₁ ", are set to "0", and the routine shifts to routine PT.

In this routine PT, the latch circuit 33 latches the information write signal PST, which causes the OFT2
Video signal according to the required information for VIDEO
be supplied. Furthermore, it is checked whether the detector 12 is turned off or not, and if it is not turned off,
Increment the contents of area _C0 of _RAM321 ,
The routine moves to the above routine WA1. In this case, since there is no recording paper P other than the first recording paper P ₁ on the conveyance paths 11 and 16, the routine PT is continued via loop 51. In other words, it is checked whether the detector 12 is turned off at regular intervals (DELAY). Thus, RAM32 ₁
When the content of the area _C0 reaches the set value "b", that is, the detector 12 remains on for a certain period of time (DELAY
xb) If the above continues, it is determined that there is a paper jam, and the jam control circuit 38 stops the operation. Furthermore, when the contents of the area _C0 of the RAM 32 ₁ reach the set value "f"("f"<"b"), the drive circuit 34
The operation command for the paper feed roller 10 is stopped, and the operation of the paper feed roller 10 is stopped. Furthermore, although not shown in the routine PT, the detector 12
The developing roller 8 starts operating a certain time _d1 after the detector 12 is turned on, and stops operating a certain time _d2 after the detector 12 turns off. When the detector 12 is turned off, the information write signal PST latched in the latch circuit 33 is released, the supply of the video signal VIDEO to the OFT 2 is stopped, and the process returns to the original routine WA.

Therefore, in routine WA, RAM32 ₁
Shift the contents of each area sequentially. That is, the area
The content "1" of F ₀ is shifted to area F ₁ and the content of area C ₀ , for example "y ₁ ", is shifted to area C ₁ . Then, the routine WR checks for input of the recording start signal START. This waiting state corresponds to a time of 2WA. Then, when the recording start signal START is input, the contents of area _F0 of _RAM321 are set to "1",
Set the contents of area _C0 to “0”. At the same time, the standby signal READY is released. Then, the routine moves to ST.

In this way, in the routine ST, the paper feed roller 10
make it work. Then, the second recording paper P ₂ is fed to the conveyance path 11 by the paper feed roller 10 .
Then, using this second recording paper _P2 , it is checked whether the detector 12 is turned on or not. At this time, the contents of the area “C ₀ ” of the RAM 32 ₁ are incremented, and the contents of the area C ₀ become the set value “a”.
, that is, _a certain period of time (DELAY×
If a) has elapsed, it is determined that there is a paper jam, and the jam control circuit 38 stops the operation. Further, in this case, routine WA1 is executed at fixed time intervals (DELAY). Therefore, the operation of routine ST corresponds to time 2ST. thus,
When the detector 12 is turned on, the RAM 32 ₁ at this time
For example, set “x ₂ ” to “ ₀ ”,
Transition to routine PT.

In this routine PT, the latch circuit 33 latches the information write signal PST, which causes the OFT2
Video signal according to the required information for VIDEO
be supplied. Furthermore, it is checked whether the detector 12 is turned off or not, and if it is not turned off,
Increment the contents of area _C0 of _RAM321 ,
Execute routine WA1. In this way, it is checked whether the detector 12 is turned off or not at regular intervals (DELAY). Then, when the contents of the area C ₀ of the RAM 32 ₁ reach the set value "b", that is, the detector 12 remains on for a certain period of time (DELAY x
b) If the above continues, it is determined that there is a paper jam, and the jam control circuit 38 stops the operation. Furthermore, when the contents of the area C ₀ of the RAM 32 ₁ reach the set value “f” (“f” < “b”), the drive circuit 34
The operation of the paper feed roller 10 is stopped. Furthermore, the developing roller 8 starts operating a certain time _d1 after the detector 12 is turned on, and the developing roller 9 stops operating a certain time _d2 after the detector 12 turns off. When the detector 12 is turned off, the information write signal PST latched in the latch circuit 33 is released, and the video signal to OFT 2 is released.
Stop supplying VIDEO and return to routine WA.

By the way, the above routine ST and routine PT
In routine WA1 executed within RAM32 ₁
The contents of areas F ₁ , F ₂ , and F ₃ are sequentially checked.
In this case, the contents of area _F1 have become "1" due to the shift operation of routine WA, and the contents of area _F2 have become "0". Therefore, conveyance path 1
It is determined that there is another recording paper P (recording paper P ₁ ) in addition to the recording paper P ₂ on the recording paper P 1 and 16 .
At this time, the content "y ₁ " in the area C ₁ of the RAM 32 ₁ is incremented, and a check is made to see if the detector 22 is off. If the detector 22 is off, the content of the area C ₁ of the RAM 32 ₁ is “y ₁ ”.
Check and return to normal. Thus, the routine WA
1 is executed repeatedly, and the content of the above area C ₁ “y ₁ ”
When the value of reaches the set value "e", that is, when the detector 22 is not turned on even after a certain period of time has passed since the first recording paper _P1 turned on the detector 12,
It is determined that there is a paper jam, and the jam control circuit 38 stops the operation. The operations of routine ST and routine PT, including this routine WA1, are based on time.
Equivalent to 2ST and 2PT. However, at this point,
Since the first sheet of recording paper _P1 has not yet reached the detector 22, a paper jam is not actually determined.

On the other hand, when the detector 12 is turned off for the second recording paper P, the information write signal PST latched in the latch circuit 33 is released and the process returns to the routine WA. Then, the contents of each area of the RAM 32 ₁ are sequentially shifted. This corresponds to 3 WA hours. Then, by routine WR, the recording start signal START
Check the input. This wait state is time
Equivalent to 3WA. Then, the recording start signal
When START is input, the above-mentioned recording paper P ₁ , P ₂
As in the case of , the third recording paper P ₃ is placed on the transport path 11.
supplied to However, in routine WM1
Since the content of area F ₁ of RAM 32 ₁ is “1”, the content of area F ₂ is “1”, and the content of area F ₃ is “0”, the third sheet is Recording paper
It is determined that two recording sheets P (recording sheets P ₁ and P ₂ ) are present in addition to P ₃ . And the area of RAM32 ₁
The contents “y ₂ ” and “y ₁ ” of C ₁ and C ₂ are incremented, respectively. In this way, when the content "y ₁ " of the area C ₂ of the RAM 32 ₁ corresponding to the first recording paper P ₁ reaches the set value "e", it is determined that there is a paper jam.
This corresponds to the time 3ST and 3PT.

Then, the detector 2 is detected by the first recording paper _P1 .
2 turns on, the contents of area F ₂ of RAM 32 ₁ are set to “2” and the contents of area C ₂ are set to “0” (time
_3PT1 ). This is the time when the first recording paper P ₁ is about to be discharged from the conveyor 16 to the tray 21 .
Since the content of area _F2 has become "2", a check is repeated to see if the detector 22 is on. At this time, the contents of area _C2 are incremented, and when the contents of area _C2 reach "h", that is, the detector 22 is turned on for a certain period of time or more by the first recording paper _P1 . If so, it is determined that there is a paper jam (time 3PT ₂ ).

In this way, when the third recording paper _P3 turns off the detector 12 and the supply of the video signal VIDEO to the OFT 2 ends, the process returns to routine WA.

Then, the routine WA sequentially shifts the contents of each area of the RAM ₃₂₁ . In other words, the area F ₃ ,
The contents of C ₃ correspond to the first recording paper P ₁ , and the area F ₂ ,
The contents of C ₃ correspond to the second recording paper P ₂ , and the area F ₁ ,
The contents of C ₁ correspond to the third recording paper P ₁ . This corresponds to 4WA hours. In this way, the recording paper P ₁ ,
P ₂ and P ₃ are sequentially transported onto transport paths 11 and 16.
Therefore, in routine WA1, RAM32 ₁
The contents of the areas C ₁ , C ₂ , and C ₃ are each incremented, and it is further checked whether the detector 22 is on. Then, when the detector 22 is turned off for the first recording paper P ₁ , the contents of the areas F ₃ and C ₃ of the RAM 32 ₁ are set to "0" (time 4WA1). This means that the first sheet of recording paper P ₁ is in tray 2.
This indicates that it was discharged at 1. thus,
The same conveyance control is performed for the second recording paper P ₂ and the third recording paper P ₃ , and when all of these recording papers P are discharged to the tray 21 (time 4WA ₇ ),
A command to the drive circuits 35 and 37 causes the transport rollers 13 and 13 and the motor (not shown) to stop operating. In other words, it becomes a standby state.

Therefore, the conveyance of the recording paper P can be controlled based on the contents of each area of the RAM 32 ₁ based on the operations of the detectors 12 and 22 and the shift operation.

Next, recording paper conveyance control in standby mode will be explained. In this case, refer to the flow chart in FIG. 3 and the time chart in FIG. 6. When the standby signal SBY is input from the standby state (time 1WA), the CPU 32 enters the standby mode in the routine WR and executes the routine ST. Therefore, in routine ST, the first recording paper _P1 is fed to the conveyance path 11, and the conveyance state of the recording paper _P1 until it reaches the detector 12 is checked (time 1ST). When the detector 12 is turned on, the process shifts to routine PT.
In this case, since standby mode is set, routine SRB is executed.

In this routine SRB, like the routine PT, after the detector 12 is turned on, the area C ₀ of the RAM 32 ₁ is
If the content has reached the contact value "t", that is, if a certain period of time has elapsed since the detector 12 was turned on, the paper feed roller 10 is stopped. Then, it is checked whether the paper feed roller 10 has stopped or not, and if it has not stopped yet, it is checked whether or not it is in the print routine (RP).
In this case, it is not yet a print routine, so
Information write signal PST is not output. Thereafter, the information write signal PST is output after a certain period of time (DELAY). Then, it checks the recording start signal START input, increments the predetermined storage areas Cr, _CSB and the area _C0 of the RAM ₃₂₁ , and starts the routine WA.
1 (time 1SRB ₁ ). Additionally, routine SRB
Return to , and check the recording start signal START in sequence (time 1SRB ₂ ). However, the recording start signal
When START is detected, the area C _SB of _RAM321 ,
Stop incrementing Cr (time 1SRB ₃ ).
Although not shown in Fig. 3, in the standby mode, after outputting the information write signal PST,
A recording start signal START and a video signal VIDEO are respectively input in synchronization with this.

Then, the content of area _C0 of _RAM321 is “f”
If the paper feed roller 10 is reached, the paper feed roller 10 is stopped, and the conveyance rollers 13, 13 are also stopped accordingly. In this way, the recording paper P is stopped at a fixed position on the conveyance path 11, and the contents of the area _C0 of the RAM ₃₂₁ are set to "0". Furthermore, it is checked whether the contents of the area _CSB and the area _C0 match or not, and the contents of the area _C0 are incremented until the contents match (time 1SRB4). Then, if there is a match, the routine
Moving to SRB1, the conveyance rollers 13 and 13 are operated to convey the stopped recording paper P again (time
1st ₂ ). At this time, a value "f" for stopping the paper feed roller 10 is transferred to the area _C0 . In this case, the value “f” transferred to area C ₀ is
Since it represents the time during which the recording paper P was conveyed after the recording paper P was turned on, the recording paper P is transferred to area C ₀ for the purpose of preventing misjudgment in routine WA1 that occurs when the recording paper P is temporarily stopped on the conveyance path 11. Then, the contents of area _C0 are modified.

Also, when the standby signal SBY is input,
The same process as above is performed, but the paper feed roller 10
If the recording start signal START is not input until the recording stops, the contents of the area _CSB become "f" and the increment ends (time 2SRB ₁ ). In this way, continue checking the recording start signal START,
Continue incrementing area Cr (time
_2SRB2 ). And if a certain period of time (DELAY×k
If the recording start signal START is not input within =T), the alarm control circuit 39 issues a warning, returns to routine SRB ₁ , and forcibly discharges the stopped recording paper P.

Therefore, if the recording start signal START is not input within a certain period of time during recording operation based on the chart paper conveyance control in standby mode, a warning will be issued, allowing the operator to detect any abnormality in the recording operation. can be easily determined. Furthermore, since the system forcibly ejects the stopped recording paper at the same time as issuing a warning, there is no need for the operator to forcibly input the recording start signal START or turn off the power. This is extremely convenient, and can also prevent unnecessary operations of the photosensitive drum, fixing device, etc.

In the above embodiment, a case was explained in which an optical fiber cathode ray tube was used to photoelectrically convert a video signal and scan and expose a photosensitive drum.
The present invention is not limited to this, and the same method can be applied even when a laser scanning method is used. In addition, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without changing the gist.

As described above, according to the present invention, during the recording operation based on the recording paper conveyance control means in standby mode, the recording start signal is input within a certain period of time after the recording paper on the conveyance path is detected by the paper feed detector. If the recording start signal is not input, a warning is issued and the recording paper on the conveyance path is forcibly ejected. This eliminates the inconvenience that occurs when the recording start signal is not input, thereby improving reliability. It is possible to provide a recording device that

[Brief explanation of drawings]

The drawings show one embodiment of the invention.
The figure is a configuration diagram, FIG. 2 is a diagram schematically showing the configuration of the control section, and FIG. 3 is a flowchart showing the control operation.
Fig. 4 is a transition diagram of each storage area of the RAM, Fig. 5 is a time chart for explaining the operation of recording paper transport control in normal mode, and Fig. 6 is a diagram for explaining the operation of recording paper transport control in standby mode. This is a time chart for. 10... Paper feed roller, 11... Conveyance path, 12...
... Paper feed detector, 16 ... Conveyance path, 17, 17, 1
8, 18... Conveyance roller, 20, 20... Paper ejection roller, 22... Ejection paper detector, 30... Control unit.

Claims (1)

[Scope of Claims] 1. Necessary information is recorded on a recording paper that is supplied onto a conveyance path by a paper feed conveyance mechanism and conveyed by the conveyance mechanism, and the recording paper that is supplied to the conveyance path is In a recording apparatus having a paper feed detector that detects a paper feed, the paper feed mechanism and the transport mechanism are driven by an input recording start signal, whereby the recording paper fed onto the transport path and transported is ejected from the transport path. a normal mode recording paper conveyance control means that continuously drives the conveyance mechanism until the recording paper is fed to the conveyance path; a standby mode recording paper transport means for temporarily stopping the recording paper at a fixed position on the transport path for a predetermined period of time after the recording paper is detected by the paper feed detector; and recording based on the standby mode recording paper transport means. A recording apparatus comprising: a control means for driving the conveyance mechanism and ejecting the recording paper stopped on the conveyance path from the conveyance path if a recording start signal is not input within the predetermined time during operation. .