JP4938964B2 - Image forming apparatus - Google Patents

Description

The present invention relates to an image forming equipment, and more particularly to a cancellation of the conveyance failure of the recording sheet (also referred to as sheet material).

  In an image forming apparatus that forms an image on a sheet material, when the sheet material fed from a paper feeding cassette or the like is transported in the image forming apparatus, a paper jam, a conveyance failure due to slippage of the sheet material (hereinafter referred to as jamming). Calling). When a jam occurs, the image forming apparatus is stopped because the image formation on the sheet material is not normally performed.

In order to resume the operation of the image forming apparatus in which the jam has occurred, it is necessary to remove the sheet material remaining in the image forming apparatus that causes the jam. To clear this jam condition, The user needs to open the cover provided in the image forming apparatus, remove the jammed sheet material, and close the cover in a state where the sheet material does not remain in the image forming apparatus (for example, the following patent document) 1). That is, the operation of the image forming apparatus is restarted assuming that the sheet material that has jammed in the image forming apparatus is removed by closing the cover provided in the image forming apparatus.
Japanese Patent Laid-Open No. 2-182645

  However, depending on the type of jam, the user may not necessarily have to open the cover and remove the paper.

  For example, a sheet feeding roller for feeding sheet materials one by one from a sheet feeding cassette slips and cannot normally feed the sheet material, and after a predetermined time from the start of feeding by the sheet feeding roller, the sheet material In the case of an abnormality in which the sheet material does not reach the sensor for detecting the presence or absence (hereinafter referred to as paper feeding delay jam), the image forming apparatus is configured to convey the sheet material without the user having to open and close the cover of the image forming apparatus. Despite being able to be discharged to the outside, it is necessary for the user to open and close the cover in order to clear the jammed state.

The present invention has such a was made under the circumstances, it is an object of the invention to provide an image forming equipment which can reduce the chance troubling the user's hand jam.

In order to solve the above problems, in the present invention, an image forming apparatus is configured as follows.
Conveying means for conveying recording paper;
Transfer means for transferring toner to the recording paper conveyed by the conveyance means;
Detecting means for detecting a conveyance failure of the recording paper based on a conveyance state of the recording paper conveyed by the conveyance device,
In the image forming apparatus for stopping the conveyance of the recording paper by the conveyance unit when the detection unit detects the conveyance failure of the recording sheet,
The transport unit has a roller disposed at a position closest to the transfer unit on the upstream side of the transfer unit in the transport direction of the recording paper;
The detection means includes a sensor arranged upstream of the transfer means in the recording paper conveyance direction and downstream of the rollers in the recording paper conveyance direction ,
If a paper feed delay jam occurs in which the recording paper is not detected by the sensor even after a lapse of a certain time from the start of feeding of the recording paper, an automatic paper discharge is performed on the display means by the transport means. Information for operating the jam clear button is displayed, and then the paper is automatically discharged by the transport means without transferring the toner onto the recording paper that has become the paper feed delay jam when the jam clear button is pressed. To the outside of the device,
When a staying jam occurs in which the recording paper stays in the apparatus after the leading edge of the recording paper is detected by the sensor, without displaying information for operating the jam clear button on the display means, and an image forming apparatus comprising without automatic discharge paper, to display the information for removing the recording sheet became the residence jam on the display unit manually by the conveying means.

According to the present invention, it is possible to provide a user-friendly image forming equipment which can reduce the chance troubling the user's hand jam.

That is, in the case of specific jam, it is possible to provide an image forming equipment which the user becomes possible jam cleared by the push of a jam clear button.

In the case of a specific jam, the driver on the display panel and / or the host computer automatically sends a jam clear command instead of the user pressing the jam clear button. it is possible to provide an image forming equipment which can perform jam cleared.

Also, for a particular jam, by performing the automatic jam clearing by the CPU or the engine controller you determine it is possible to provide an image forming equipment without troubling the user.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to examples.

  The “printer” according to the first embodiment will be described with reference to FIGS.

  FIG. 1 is a cross-sectional view illustrating a schematic configuration of a printer 20 serving as an image forming apparatus.

  1 is a sheet feeding cassette, 2 is a sheet material, 3 is a cassette feeding roller, 4 is a conveyance roller, 5 is a sheet material conveyance path, 6 is a registration roller, and 7 is a detection sensor that detects the presence or absence of the sheet material 2. TOP sensor, 8 transfer roller, 9 photosensitive drum, 10 pressure roller, 11 fixing film, 11a ceramic heater, 11b thermistor, 12 paper discharge roller, 13 CPU as a judging means, 14 is a heater drive circuit, 15 is a scanner motor, 16 is a main motor, 17 is a paper discharge sensor as one of detection means, and 20 is a printer as an image forming apparatus.

  The printer 20 shown in FIG. 1 uses an electrophotographic method, and a toner image is formed on the sheet material 2 by an operation as described later.

  FIG. 2 is a block diagram illustrating a schematic configuration of the printer of this embodiment.

  FIG. 2 also shows a host computer 30 that is an external device that transmits an image signal and the like to be printed by the printer 20 in addition to the components constituting the printer 20.

  In FIG. 2, reference numeral 21 denotes an engine controller that controls each part of the printer 20.

  The printer 20 of this embodiment includes a CPU 13 in the engine controller 21.

  Reference numeral 22 denotes a high voltage output circuit, which is a developing roller for developing the electrostatic latent image formed on the charging roller (not shown) or the photosensitive drum 9 for charging the surface of the photosensitive drum 9 with toner. This is a circuit for applying a high voltage to a roller (not shown), a transfer roller 8 for transferring a toner image formed on the photosensitive drum 9 to the sheet material 2, and the like.

  An image controller 23 receives image information and a print command transmitted from the host computer 30 and develops the image information into bit data suitable for image formation by the printer 20 and develops the image information. A print start command, which is a control signal indicating that printing should be performed according to the image signal, is transmitted to the engine controller 21 together with the processed bit data.

  Reference numeral 24 denotes a display panel for displaying a message to the operator (user) by the printer 20.

  As a means for displaying a message to an operator (user), in addition to the display panel 24 described above, the message is displayed on a display screen such as a display of a host computer 30 connected to the image controller 23. Anyway. In this case, the printer 20 and the host computer 30 constitute an image forming system (see FIGS. 4 and 5).

  4 and 5, 25 is a jam clear button connected to the image controller 23, and 30 is a host computer that includes a display screen 31 and controls the display of the display screen 31. Reference numeral 32 denotes a communication line for communication between the host computer 30 and the image controller 23 of the printer 20, and 33 denotes a jam clear button provided on the screen of the host computer 30. It should be noted that the jam clear button on the host computer 30 may be configured such that the display screen is a touch panel type and the button part on the display screen is directly pressed by the operator (user). You may comprise so that the button part on a display screen may be indirectly pressed by the operator (user) with pointing devices, such as a mouse | mouth provided.

  As described above, the printer 20 includes the display panel 24 and the jam clear button 25, and the host computer 30 includes the jam clear button 33.

  When the operator (user) presses the jam clear button 25 of the printer 20, the fact that the jam clear button 25 has been pressed is input to the image controller 23. Then, in response to pressing of the jam clear button 25, the image controller 23 transmits a jam clear command, which is a command for instructing the CPU 13 or the engine controller 21 to clear the conveyance failure (jam).

  When the jam clear button 33 on the display screen 31 of the host computer 30 is pressed, the host computer 30 transmits a jam clear command to the image controller 23 via the communication line 32. Then, in response to pressing of the jam clear button 33, the image controller 23 further transmits a jam clear command, which is a command for instructing the CPU 13 or the engine controller 21 to cancel the conveyance failure (jam).

  Reference numeral 35 (refer to FIG. 2) denotes a door switch, which is a switch for detecting an open / closed state of a door that can be opened and closed to access the inside of the printer 20.

  Next, a series of printing operations in which the printer 20 forms a toner image on the sheet material 2, heat-fixes it, and discharges it outside the printer 20 will be described. The printing operation of the printer 20 is mainly executed by an engine controller 21 described later.

  First, the image controller 23 receives from the host computer 30 a print command, which is a command to print, together with image information to be printed. Then, the image forming controller 23 develops image information into bit data suitable for image formation, and prints a control signal indicating that printing according to the image signal should be performed together with the developed bit data. A start command is transmitted to the engine controller 21.

  Upon receiving the print start command from the image controller 23, the engine controller 21 feeds the sheet material 2 stacked in the sheet feeding cassette 1 by the cassette sheet feeding roller 3, and further conveys the sheet material in the printer 20 by the conveying roller 4. Paper is fed onto the path 5.

  Next, the CPU 13 of the engine controller 21 determines whether or not the top end of the sheet material 2 is detected by the TOP sensor 7.

  Then, in response to the TOP sensor 7 detecting the leading edge of the sheet material 2, the engine controller 21 determines the leading edge of the sheet material 2 conveyed by the registration roller 6 and the leading edge position of the toner image transferred to the sheet material 2. Formation of an electrostatic latent image on the photosensitive drum 9 is started so as to obtain a desired positional relationship.

  The engine controller 21 starts the formation of an electrostatic latent image on the photosensitive drum 9 by exposing the surface of the photosensitive drum 9 with laser light by the scanner unit 15, and also develops the electrostatic latent image on a developing roller (not shown). ) With toner. Then, the engine controller 21 applies a transfer voltage from the high voltage output circuit 22 to the transfer roller 8 to transfer the toner image on the photosensitive drum 9 to the sheet material 2.

  Then, the engine controller 21 conveys the toner to the pressure roller 10 for fixing the sheet material 2, the fixing film 11, and the ceramic heater 11 a to heat and press the toner on the sheet material 2, and then discharges the toner. The paper is discharged to the outside of the printer 20 by the paper roller 12.

  The paper discharge sensor 17 detects whether or not the sheet material 2 has been discharged.

  Here, the thermistor 11b detects the temperature of the ceramic heater 11a and transmits it to the CPU 13. The CPU 13 controls the heater drive circuit 14 to control the temperature of the ceramic heater 11a.

  The CPU 13 performs control so that the applied power is increased by the amount of heat applied to the paper during the period in which the sheet material 2 passes through the ceramic heater 11a so as to keep the temperature of the ceramic heater 11a constant.

  The main motor 16 drives the transfer roller 8, the photosensitive drum 9, and the pressure roller 10.

  Next, a control operation in the case where a paper jam occurs in the present embodiment will be described with reference to the flowchart of FIG.

  3 is an operation mainly executed by the image controller 23 (corresponding to the image processing control means in claims) and the engine controller 21 (corresponding to the image formation control means in claims) included in the printer 20. is there.

  In FIG. 3, the engine controller 21 starts printing upon receiving a print start command from the image controller 23 (S201).

  Next, the CPU 13 of the engine controller 21 monitors whether or not a conveyance failure (jam) occurs in the sheet material 2 fed from the sheet material 2 stacked in the sheet feeding cassette 1 by the cassette sheet feeding roller 3. (S202).

  The CPU 13 of the engine controller 21 determines a plurality of types of conveyance failures (jams) in S202. First, when the top sensor 7 does not detect the leading edge of the sheet material 2 within a predetermined time after the sheet material 2 is fed by the cassette sheet feeding roller 3, the sheet material 2 fed to the TOP sensor 7 is not detected. It is determined that the arrival is delayed and “paper feeding delay jam” is determined, and the process proceeds to S204.

  In S202, the CPU 13 of the engine controller 21 detects the sheet material 2 when the TOP sensor 7 detects the leading edge of the sheet material 2 and does not detect the trailing edge of the sheet material 2 by a predetermined time. Is staying at the position detected by the TOP sensor 7, it is determined as “TOP sensor staying jam” and the process proceeds to S 204.

  In S202, the CPU 13 of the engine controller 21 detects the paper discharge sensor 17 by a certain time after the TOP sensor 7 detects the leading edge of the sheet material 2 (a time longer than a certain time for determining the TOP sensor retention jam). However, if the leading edge of the sheet material 2 is not detected, it is determined that the arrival of the sheet material 2 to the paper discharge sensor 17 is delayed and “paper discharge sensor front edge delay jam” is determined, and the process proceeds to S204.

  Further, in S202, the CPU 13 of the engine controller 21 determines that the sheet material is not detected by the paper discharge sensor 17 by a predetermined time after the paper discharge sensor 17 detects the leading edge of the sheet material 2. No. 2 is staying at the position detected by the paper discharge sensor 17, and “paper discharge sensor stay jam” is determined, and the process proceeds to S204.

  In S202, the CPU 13 of the engine controller 21 does not generate any of the “feed delay jam”, “TOP sensor stay jam”, “discharge sensor tip delay jam”, and “discharge sensor stay jam”. If it is determined that the printing is finished, the printing is terminated (S203).

  In S <b> 204, the engine controller 21 receives the determination of the CPU 13, and rotates the motor, that is, transports the sheet material 2 and outputs a high voltage via the scanner motor 15, the main motor 16, and the high voltage output circuit 22. The rotation of the fan for cooling the lens, the rotation of the scanner motor that rotationally drives the polygon motor in the scanner unit 15, the laser emission in the scanner unit 15 and the like are immediately stopped.

  Then, the CPU 13 determines the type of jam detected at this time (any one of “feed delay jam”, “TOP sensor stay jam”, “discharge sensor tip delay jam”, and “discharge sensor stay jam”) from the image controller. 23 and the host computer 30 connected via the image controller 23 to communicate as status information. The image controller 23 displays a message on the display panel 24, and the host computer 30 displays a message on a display screen 31 such as a CRT included in the host computer 30 according to the notified jam type (S205).

  Specifically, in S205, the image controller 23 determines that a jam occurring in the printer 20 is a specific jam (here, a paper feed delay jam) based on status information indicating the type of jam notified from the CPU 13. It is determined whether or not.

  When the jam type indicated by the status information notified from the CPU 13 to the image controller 23 is “feed delay jam”, the process proceeds to S206, and the image controller 23 automatically discharges the image on the display screen 31 of the host computer 30. A selection screen for performing jam clearing is displayed (see FIG. 4). Further, the image controller 23 causes the display panel 24 to display a screen asking whether or not to clear the jam by automatic paper discharge. The display on the display panel 24 and the display on the host computer 30 may be performed together, or either one may be performed.

  On the other hand, when the type of jam notified from the CPU 13 to the image controller 23 is “TOP sensor retention jam”, “paper ejection sensor delay jam”, or “paper ejection sensor retention jam” other than “paper feed delay jam” In step S209, the image controller 23 displays on the display screen 31 of the host computer 30 a message prompting the operator (user) to perform jam processing by manual paper discharge (see FIG. 5).

  Further, the image controller 23 displays a message on the display panel 24 prompting the operator (user) to perform jam processing by manual paper discharge. The display on the display panel 24 and the display on the host computer 30 may be performed together, or either one may be performed.

  In step S <b> 206, the image controller 23 presses the jam clear button 25 or 33, and the operator (user) selects to automatically discharge the sheet material 2 related to a conveyance failure (jam). The image controller 23 receives an input signal indicating that the jam clear button 25 or 33 has been pressed.

  When the input signal is input, the image controller 23 causes the CPU 13 or the engine controller 21 to cancel the rotation stop of the main motor 16 due to a conveyance failure (jam), the high voltage output circuit 22 from stopping the high voltage output, or the like. The jam clear command is generated and the jam clear command is transmitted, and the process proceeds to S207.

  Note that an input signal is input to the image controller 23 at an arbitrary timing from the jam clear button 25 by an operation by the operator, but a jam clear command is transmitted from the image controller 23 to the CPU 13 or the engine controller 21. This is performed only when the image controller 23 has a specific conveyance failure (here, paper feed delay jam) in the printer 20.

  If it is determined in S206 that automatic paper discharge is not performed, the process proceeds to S209.

  If none of them are selected in S206, the process waits (if a certain time has passed in the waiting state, it can be configured that one of the selections has been made and the process proceeds.)

  In step S207, the CPU 13 determines whether there is no sheet material 2 remaining in the printer 20 or whether automatic sheet discharge is possible.

  Describing in detail about S207, the CPU 13 starts the initialization operation for starting the rotation of the main motor 16 and the output of the high voltage by the high voltage output circuit 22 upon receiving the jam clear command from the image controller 23. In the initialization operation, the conveyance roller 4 and the registration roller 6 are rotated by a driving force given by the main motor 16. When there is the sheet material 2 stopped between the cassette paper feed roller 3 and the registration roller 6 in S204 (FIG. 6), the TOP sensor 7 is before a predetermined time has elapsed since the start of the initialization operation. Then, the tip of the sheet material 2 is detected (FIG. 7).

  As described above, when the TOP sensor 7 detects the leading edge of the sheet material 2 before a predetermined time has elapsed since the start of the initialization operation, the sheet material 2 causing the paper feed delay jam is automatically detected. It is determined that the paper can be discharged.

  If the TOP sensor 7 and the paper discharge sensor 17 have not detected the sheet material 2 when a predetermined time has elapsed after the start of the initialization operation, it is determined that there is no sheet material remaining in the printer 20.

  If the CPU 13 determines that there is no sheet material 2 remaining in the printer 20, or determines that the sheet material 2 causing the paper feed delay jam can be automatically discharged, the process proceeds to S208.

  On the other hand, if the CPU 13 determines that there is a sheet material 2 remaining in the printer 20, or if the CPU 13 determines that the sheet material 2 causing the paper feed delay jam cannot be automatically discharged, the process proceeds to S209.

  In S208, if the jam occurring in the printer 20 is a jam that can be automatically discharged, the automatic discharge is terminated, and the process proceeds to S211.

  On the other hand, in S209, a message prompting the user to manually open the cover of the image forming apparatus and perform jam processing is displayed, and the process proceeds to S210.

  First, a case where the jam type is “paper discharge delay jam” will be described.

  At this time, if status information indicating “paper discharge delay jam” is transmitted to the image controller 23, the image controller 23 determines that the type of jam is other than paper feed delay jam in S206 in the flowchart of FIG. In step S209, the display panel 24 provided in the printer 20 does not display a screen asking whether or not to clear the jam by automatic paper discharge. Accordingly, the jam clear command is not transmitted from the image controller 23 to the engine controller 21, and automatic paper discharge is not performed.

  If the status information indicating “paper discharge delay jam” is transmitted to the host computer 30 via the image controller 23, the image controller 23 determines the type of jam at S206 in the flowchart of FIG. Since the process proceeds to step S209 assuming that the jam is other than the paper feed delay jam, the selection screen for clearing the jam by automatic paper discharge is not displayed on the display screen 31 of the host computer 30. Accordingly, the jam clear command is not transmitted from the host computer 30 to the engine controller 21 via the image controller 23, and automatic paper discharge is not performed.

  The reason is that if the user does not perform jam processing and the CPU 13 or the engine controller 21 receives a jam clear command from the image controller 23 and / or the host computer 30 and attempts to automatically discharge the paper, the following problem occurs. Because there is a possibility.

  The “paper discharge delay jam” is a conveyance failure when the paper discharge sensor 17 does not detect the front end of the sheet material 2 within a predetermined time after the TOP sensor 7 detects the front end of the sheet material 2. A case where the front end of the sheet material 2 is wound around the fixing device (the fixing film 11 or the pressure roller 10) can be considered. When the automatic paper discharge is started in such a state, the sheet material 2 is further wound around the fixing device, and the cover of the printer 20 is opened to remove the jammed sheet material 2 from the operator (user). There is a possibility of becoming a jam that cannot be performed (hereinafter, unclearable jam).

  Therefore, in the case of “paper discharge delay jam”, it is determined that automatic paper discharge is impossible, and automatic paper discharge is not performed, and an operator (user) manually opens the cover of the printer 20 to cause a paper jam. In response to removing the sheet material 2 and closing the cover, the engine controller 21 clears the jam.

  In the above description, “paper discharge delay jam” has been described. However, in the case of “paper discharge sensor retention jam” and “TOP sensor retention jam”, an unclearable jam is caused in the same manner as “paper discharge delay jam”. There is a possibility that. Therefore, even if the image controller 23 transmits a jam clear command to the CPU 13 due to a communication error or the like, the CPU 13 does not automatically discharge paper.

  In S210, the CPU 13 checks whether the manual paper discharge is completed by detecting the open / closed state of the door switch 35, and the open / close state of the door switch is switched from the open state to the closed state to confirm the completion of the manual paper discharge. If YES, go to S211.

  In S211, the jam clear is performed assuming that the jam generated in S202 has been canceled.

  When the jam clear is performed, the control state of the engine controller 21 of the printer 20 becomes the ready state (S212), and the print can be started again.

  By performing the above-described control, in the case of a specific jam that can be conveyed and discharged out of the image forming apparatus without opening and closing the cover of the image forming apparatus, which is called “paper feeding delay jam”, the operator The jam clearing can be performed only by (user) pushing the jam clear buttons 25 and 33 on the display panel 24 and / or the host computer 30 screen.

  Therefore, a user-friendly image forming apparatus, image forming system, image forming apparatus control method, and image forming system control method can be provided to the user.

  Even in the case of “feed delay jam”, if the user opens / closes the door during the sequence (for example, when the sheet material 2 is manually removed), the process proceeds to S207 or S210. Can be configured.

  Next, the “printer” in the second embodiment will be described.

  In the first embodiment, when “feed delay jam” is notified from the CPU 13 to the display panel 24 and / or the host computer 30, the user clears the jam clear buttons 25 and 33 on the display panel 24 and / or the host computer 30. Instead of pressing (YES in S206), it is determined that the driver (printer driver or the like) on the display panel 24 and / or the host computer 30 is automatically in the “feed delay jam” state, and a jam clear command is transmitted. .

  Further, in the first embodiment, when the CPU 13 determines that the “paper feeding delay jam” state is set (YES in S205), the user pushes the jam clear buttons 25 and 33 on the display panel 24 and / or the host computer 30 screen ( S206) may be omitted, and the CPU 13 or the engine controller 21 may automatically determine whether there is no remaining paper in the apparatus or whether automatic paper discharge is possible (S207).

  By performing such control, a user-friendly image forming apparatus and image forming system that can automatically perform jam clearing without a user's hand in the case of a specific jam called “paper feeding delay jam” An image forming apparatus control method and an image forming system control method can be provided.

  In the first and second embodiments, an example in which the user's effort is omitted in the case of “paper feeding delay jam” has been described. However, the present invention is not limited to this, and the jam processing by the user's hand is required. It goes without saying that other types of jams that can not be handled can be handled automatically as well.

  As described above, it is possible to provide a user-friendly image forming apparatus, an image forming system, a control method for the image forming apparatus, and a control method for the image forming system that can reduce the chance of the user handling the jam processing.

  That is, in the case of a specific jam, it is possible to provide an image forming apparatus, an image forming system, an image forming apparatus control method, and an image forming system control method that enable the user to clear the jam simply by pressing the jam clear button. .

  In the case of a specific jam, the driver on the display panel and / or the host computer automatically sends a jam clear command instead of the user pressing the jam clear button. In addition, it is possible to provide an image forming apparatus, an image forming system, an image forming apparatus control method, and an image forming system control method capable of performing jam clearing.

  In the case of a specific jam, an image forming apparatus, an image forming system, an image forming apparatus control method, and an image which do not bother the user by automatically clearing the jam according to the judgment of the CPU or the engine controller. A method of controlling the forming system can be provided.

  Needless to say, the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the appended claims.

Sectional drawing which shows schematic structure of the printer which is Example 1. FIG. Block diagram showing printer control configuration Flow chart showing control operation when jam of recording paper occurs Figure showing a message displayed on the host computer screen when a paper feed delay jam occurs Figure showing a message displayed on the host computer screen when a jam other than a paper feed delay jam occurs The figure which shows the case where the sheet | seat material 2 stopped between the cassette paper supply roller 3 and the registration roller 6 exists. The figure which shows the case where the TOP sensor 7 detects the front-end | tip of the sheet | seat material 2 before fixed time passes after starting initialization operation | movement.

Explanation of symbols

7 TOP sensor 17 Paper discharge sensor 21 Engine controller 23 Image controller 24 Display panel 25 Jam clear button 30 Host computer

Claims (3)

Conveying means for conveying recording paper;
Transfer means for transferring toner to the recording paper conveyed by the conveyance means;
Detecting means for detecting a conveyance failure of the recording paper based on a conveyance state of the recording paper conveyed by the conveyance device,
In the image forming apparatus for stopping the conveyance of the recording paper by the conveyance unit when the detection unit detects the conveyance failure of the recording sheet,
The transport unit has a roller disposed at a position closest to the transfer unit on the upstream side of the transfer unit in the transport direction of the recording paper;
The detection means includes a sensor arranged upstream of the transfer means in the recording paper conveyance direction and downstream of the rollers in the recording paper conveyance direction ,
If a paper feed delay jam occurs in which the recording paper is not detected by the sensor even after a lapse of a certain time from the start of feeding of the recording paper, an automatic paper discharge is performed on the display means by the transport means. Information for operating the jam clear button is displayed, and then the paper is automatically discharged by the transport means without transferring the toner onto the recording paper that has become the paper feed delay jam when the jam clear button is pressed. To the outside of the device,
When a staying jam occurs in which the recording paper stays in the apparatus after the leading edge of the recording paper is detected by the sensor, without displaying information for operating the jam clear button on the display means, and an image forming apparatus comprising without automatic discharge paper, to display the information for removing the recording sheet became the residence jam on the display unit manually by the conveying means.   The image forming apparatus according to claim 1, wherein the display unit is disposed in the image forming apparatus. 2. The registration roller according to claim 1, wherein the roller is a registration roller for synchronizing the timing at which the recording paper is conveyed to the transfer means and the timing at which the toner is transferred to the recording paper by the transfer means. Image forming apparatus.

Images