JP2927441B2 - Image forming system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to various types of printer systems such as laser printers, LED printers, liquid crystal shutter printers, and ink jet printers, or images such as high-function copiers and high-function faxes. Related to the forming system.

2. Description of the Related Art An image forming system such as a laser printer system includes an image forming apparatus, a recording medium feeding device (such as a large amount paper feeding device), a recording medium conveying device (such as a duplex conveying device), and a recording medium discharging device. An additional device such as a large-volume paper ejection device, a reverse paper ejection device, or a multi-stage paper ejection device, and a peripheral device control device. The peripheral device control device receives character information or image information from a host system and receives the above information. The image data is sent to the image forming apparatus, and the image forming apparatus and the additional device are controlled to form an image on a recording medium.
Further, a display unit is provided outside the system, and a schematic figure (painting) of the entire system is drawn on the display unit, and a position corresponding to each unit in the image forming apparatus or each additional device on the figure is displayed. Some have LEDs for displaying errors.

By the way, in such an image forming system, when a paper jam occurs due to an error such as a broken edge, a skew, a curl, or a double feed on the transport path of the image forming apparatus, the system is stopped, and the system is stopped. For example, if sheets are left in the conveyance paths of the two-sided conveying device and the reversing sheet discharging device, it is determined that a paper jam has occurred in the two devices, and the display corresponding to each device together with the image forming device is performed. LED of the unit flashes.

Therefore, the operator or the service person can know the above three apparatuses in which the paper jam has occurred from the blinking and lit LED, and investigates the inside of the apparatus and removes any error-causing factors. The error was resolved.

[Problems to be solved by the invention]

However, in the conventional image forming system,
As described above, not only the image forming apparatus that directly caused the error but also the double-sided conveyance device and the reversing sheet discharge device that are actually unrelated to the error are investigated. It took a lot of trouble and time, and also hindered the printing work.

The present invention has been made in view of the above points, and has as its object to enable an error to be eliminated at an early stage.

[Means for solving the problem]

In order to achieve the above object, the present invention provides an image forming system capable of transporting a plurality of sheets at a time on a transport path. Means are provided for displaying in a different manner the jam occurrence positions of all the sheets remaining on the path and the first sheet jam occurrence position that caused the sheet jam.

[Action]

According to the image forming system of the present invention, if a paper jam occurs while a plurality of sheets are being conveyed on the conveyance path, the paper jam occurrence position of all the sheets remaining on the conveyance path and the paper jam are caused. Since the jam occurrence position of the first sheet is displayed in a different manner, the device that directly caused the error can be recognized at a glance, and the error can be easily eliminated without wasting time.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention.

This image forming system includes a peripheral device controller (device controller) 1 connected to a host system 2 such as a word processor or a computer, and peripheral devices connected to the peripheral device controller 1 via an interface (not shown). Equipment, namely, an image forming apparatus 3 and a large-volume sheet feeding device 4 as a recording medium feeding device as five types of additional devices;
Reversing paper ejection device 5 as recording medium ejection device, multi-stage paper ejection device 6
And a large-volume sheet discharging device 7 and a double-sided conveying device 8 as a recording medium conveying device.

Further, a panel display section 5a for displaying various information is provided outside the image forming apparatus 3.

FIG. 1 shows that the additional devices connected to the peripheral device control device 1 are limited to five types of additional devices, but it is also possible to add more additional devices in addition to the five types.

FIG. 2 is a schematic diagram schematically showing an internal configuration of a printer system according to a more specific embodiment of the present invention, and portions corresponding to FIG. 1 are denoted by the same reference numerals.
Further, the paper transport path is indicated by a solid line with an arrow.

The printer system includes a system table 20, a print engine as an image forming apparatus (including an engine driver (not shown) and a panel display unit 3a shown in FIG. 1).
3, five optional units, each of which is a unitized additional device, that is, a large-volume paper feeding unit (LCIT) 4, which is a large-volume paper feeding device, a reverse unit (FDS) 5, which is a reverse paper discharging device, and multi-stage paper discharging. It comprises a multi-stage discharge unit 6 which is an apparatus (mail box or sorter), a large-scale discharge unit (LCOT) 7 which is a mass discharge device, and a duplex unit (DPX) 8 which is a double-sided conveyance device. I have.

Further, the peripheral device control device 1 shown in FIG. 1 is stored in the system table 20.

The print engine 3 is a laser printer, which detachably mounts an upper paper feed cassette 15 and a lower paper feed cassette 16 capable of storing sheets (sheet paper) of different sizes, and has a laser forming an image forming unit inside. Writing unit 3
0, photoreceptor drum 31, charging charger 32, developing unit 33,
Transfer charger 34, cleaning unit 35, and fuser
36, a plurality of paper transport rollers including paper feed rollers 37, 37 and a registration roller 38 for supplying paper from the upper paper cassette 15 and the lower paper cassette 16, and their drive motors and drives. A mechanism and the like are provided.

As a paper supply source, in addition to the upper paper feed cassette 15 and the lower paper feed cassette 16 of the print engine 3, a large-volume paper feed unit 4 and an duplex unit 8 (refeeding units) which are optional units connected to the print engine 3. (Only on paper)
When any one of them is selected and the paper is supplied by the paper feed roller 37, the printer stands by at a position sandwiched by the registration rollers 38.

On the other hand, the photosensitive drum 31 rotates in the direction of the arrow, and the laser beam modulated by the laser writing unit 30 in accordance with the video signal is scanned in the drum axis direction on the surface charged by the charging charger 32. While irradiating and exposing,
Form a latent image.

The latent image is developed by the toner from the developing unit 33, and is transferred by a registration roller 38 to the sheet fed to the image transfer section at a predetermined timing by the operation of the transfer charger 34. The sheet is conveyed to a fixing unit 36, where the sheet is heated and fixed, and then sent to a reversing unit 5.

Paper feed paths from the three paper supply sources are separately provided up to the registration roller 38 immediately before transfer. In particular, the paper feed path from the large-volume paper feed unit 4 and the double-sided unit 8 is provided with an inlet at the bottom of the print engine 3 so as to coincide with the discharge (re-feed) port of the double-sided unit 8. I have.

The large-volume sheet feeding unit 4 can store up to 2000 sheets of a maximum of B4 size, and has a tray 40 on which the sheets are placed and moved up and down.

The paper discharged from the print engine 3 and sent to the reversing unit 5 is selectively switched in the transport direction by transport switching means 51 constituted by three step rollers and the like. , And three lower outlets A,
Sent from either B or C.

The reversing unit 5 has a reversing stack function for storing single-sided printed sheets up to a maximum of A3 size, and a function of switching the paper discharge to the discharge tray 52, the sorter 6, the double-sided unit 8, and the large-volume discharge unit 7. . The printed paper conveyed to the upper outlet A is printed by the print engine 3.
The paper is discharged onto a paper discharge tray 52 provided at the top of the printer.

The sorter 6 is provided with a number of bins 61, and conveys printed sheets sent from the outlet B on the side of the reversing unit 5 to a designated bin and stacks them.

In this example, the large-volume sheet discharging unit 7 receives printed sheets sent from the feeding port C below the reversing unit 5 via the transport path in the double-sided unit 8 and sorts and stacks the jobs for each job. With function, up to A3
Holds up to 2000 sheets of paper up to the size.

The double-sided unit 8 receives the sheet printed on one side from the feeding port C below the reversing unit 5 and feeds the sheet again.
It has a function to supply to the print engine 3 again through 81 and enables double-sided printing.

A number of photosensors and microswitches (hereinafter simply referred to as "sensors") for detecting the paper jam are provided in the print engine 3 of the system and the paper transport path of each of the option units 4 to 8.

That is, the registration roller 38 in the print engine 3
Sensor S ₁ immediately before the sensor S ₂ to the outlet of the fixing unit 36, a sensor S ₃ on the outlet of the reversing Yunitsuto 5, in common to the inlet of the sorter 6 the sensor S _4, the discharge portion of the bottle the S _5, both surfaces Yunitsuto sensor S ₆ on the inner side of the feed port from the bulk feed Yunitsuto 4 in 8, the reverse sensor S ₇ inside the feeding port from Yunitsuto 5, inner outlet to the print engine 3 Sensor S ₈
The sensor S ₉ near the discharge paper inlet in the mass discharge unit 7.
Are arranged respectively.

Each of the option units 4 to 8 has a built-in CPU of one chip, and together with the CPU of the print engine 3 (located in the engine driver), when a paper jam occurs, it is detected by a signal from each of the sensors. .

That is, the CPU in the print engine 3 controls the peripheral device control device 1 so that the upper paper feed cassette 15 of the print engine 3 is controlled.
Or from emitting a signal to start sheet feeding from the lower sheet feeding cassette 16, or (received via the peripheral device control apparatus 1 from the CPU in the two-sided Yunitsuto 8) a paper detection signal received from the sensor S ₈ to From the sensor S ₁ even after a predetermined time elapses
If no paper detection signal is received from the print engine 3, it is determined that a paper jam has occurred on the paper feed path of the print engine 3.

Further, after the conveyance of the sheet by the registration roller 38 is started, the transfer unit when the sheet detection signal continues to be received from the sensor S ₁ even after the lapse of a predetermined time period, reception sheet detection signal from the sensor S ₁ fuser If the paper detection signal from the sensor S ₂ be the predetermined time has elapsed after ceases is not received
Within 36, it is determined that a paper jam has occurred.

The CPU in the reversing unit 5 determines whether the sheet detection signal is not received from any of the sensors S ₃ , S ₄ , and S ₇ even if a predetermined time elapses after the sheet detection signal from the sensor S ₂ is not received. It is determined that a paper jam has occurred in the reversing unit 5.

CPU in the sorter 6, when the sheet detection signal from the sensor S ₅ be the predetermined time has elapsed after the sheet detection signal from the sensor S ₄ has been received is not received, the paper jam has occurred in the sorter within 6 And judge.

CPU of the bulk feed Yunitsuto 4 is a mode using the mass paper feeding Yunitsuto 4, if the sheet detection signal from the sensor S ₆ also passed since issuing a paper feed start signal a predetermined time is not received, It is determined that a paper jam has occurred in the large-volume paper feeding unit 4.

Mass CPU of the discharge Yunitsuto within 7 is a mode using the bulk discharge Yunitsuto 7, the reception state of the predetermined time to be the signal after the sheet detection signal from the sensor S ₉ is received is followed In this case, it is determined that a paper jam has occurred in the large-volume sheet discharging unit 7.

In the mode in which the duplex unit 8 is used, in the mode in which the duplex unit 8 is used, if the paper detection signal from the sensor S ₈ is not received within a predetermined time after receiving the paper detection signal from the sensor S ₇ , It is determined that a paper jam has occurred in the duplex unit 8.

By the way, the predetermined time used for each of these determinations differs depending on the paper size and each discrimination position, and the predetermined time is previously set and stored in the ROM in each CPU of each of the units 3 to 8. .

Each of the ROMs has a different jam code (for the print engine 3) corresponding to each paper jam occurrence position.
The ROM in the CPU stores three types of jam codes (corresponding to three paper jam occurrence positions), and when a paper jam is detected, reads the jam code corresponding to the paper jam occurrence position from the ROM and reads it out. The processing operation of the peripheral device control device 1 when it is transmitted to the device control device 1 and the jam code is received will be described later in detail.

By the way, this embodiment has a full system configuration.
Type paper feeding unit (upper paper cassette 15, lower paper cassette 16,
And a large-volume paper-feeding unit 4) and three types of paper-discharging units (paper-discharge tray 52, sorter 6, and large-volume paper-discharging unit 7) can be arbitrarily combined and selected.

Next, the peripheral device control device 1 shown in FIG. 1 and FIG.
Will be specifically described.

The peripheral device control device 1 has a built-in 16- or 32-bit microcomputer (hereinafter abbreviated as "CPU") composed of a CPU, ROM, RAM, I / O and the like. 3. When a paper jam occurs on the transport path of the large-volume paper feeding unit 4, the reversing unit 5, the sorter 6, the large-volume paper discharging unit 7, and the duplex unit 8, an error code from the peripheral device that caused the paper jam (this In the example, it has a function of receiving a “jam code”, a function of displaying the jam code on the panel display unit 3a, and a function of transmitting data of a device name corresponding to the jam code of the host system 2.

The peripheral device controller 1 includes a host system 2
It also has a function of receiving character information or image information and sending it to the print engine 3.

Further, the peripheral device control device 1 is a host system 2
Has a function of controlling the peripheral devices in accordance with the control command and transmitting status information from the peripheral devices to the host system 2.

FIG. 3 is an external view showing a specific example of the panel display section 3a in FIG.

Reference numeral 3b denotes a jam indicator, which comprises a schematic diagram of the system (a part corresponding to the sorter 6 is omitted) and six LEDs 1 to 6 emitting red light for indicating the paper jam occurrence position.

The numbers 1 to 6 indicate jam codes owned by the peripheral devices 5 to 8 (excluding the sorter 6) indicating the paper jam occurrence position.

The names of the paper jams in which the LEDs 1 to 6 blink and light (or light only) may be as follows.

1: Paper feed jam 2: Transport jam 3: Fixing jam 4: LCIT jam 5: FDS jam and LCOT jam 6: DPX jam 3c is an LCD (liquid crystal) display, for example, a 2 line x 32 character character display. Various information in characters (Hiragana, Katakana, Kanji, English characters, numbers, symbols, etc.)
Can be displayed.

The display 3c receives the jam code from the peripheral device control device 1 by the print engine 3,
Paper jam occurrence pictogram 3c ₁ and its jam code 3c ₂
Is displayed.

Next, the operation of the embodiment configured as described above will be described.

In the printer system shown in FIG. 2, when the double-sided print mode is designated, and the large-volume paper feeding unit 4 and the large-volume paper ejection unit 7 are selected and the printing is executed, the paper is routed through the following route. Is miscellaneous.

That is, first, the paper from the large-volume paper feed unit 4 is fed to the print engine 3 via the duplex unit 8.

Then, after the front side of the sheet is printed in the image forming section, the sheet is sent to the reversing unit 5, where the sheet is reversed and fed again to the print engine 3 through the double-sided unit 8, and printed on the back side of the sheet in the image forming section. You.

Thereafter, the sheet is discharged to the mass discharge unit 7 via the reversing unit 5 and the double-sided unit 8.

Thereafter, by repeating the above operation, continuous printing is performed.

Here, the processing operation of the peripheral device control device 1 when a paper jam occurs on the paper feed path of the print engine 3 will be specifically described.

That is, the CPU in the print engine 3 uses the sensor S ₈
If the paper detection signal from the sensor S ₁ be a predetermined time has elapsed after receiving the paper detection signal is not received from, it is determined that the paper jam occurs on the feeding path of the print engine 3 Jiyamukodo "1 Is transmitted, and the peripheral device control device 1 receives it.

Accordingly, the peripheral device control device 1 sequentially executes the following processing.

1) Paper feed jam position (paper feed path of print engine 3)
The operation of the double-sided unit 8 on the upstream side of is stopped.

2) The operation of the reversing unit 5, which is on the upstream side of the double-sided unit 8, is stopped.

3) The print engine 3 which is upstream of the reversing unit 5
The operation of each part (fixing device 36 and the like) around the fixing paper discharge path in the inside is stopped.

Consequently, as a result, the operation of each part around the paper feed path (the paper feed roller 37 and the like), the duplex unit 8, the reversing unit 5, and the parts around the fixing paper discharge path are stopped.

It should be noted that such a stop of the operation is performed by the peripheral device control device 1 from each peripheral device (for example, the double-sided unit 8, the reverse / inverted unit 5,
This is realized by transmitting a command command for emergency stop to the print engine 3).

At this time, if the paper is stopped on the paper transporting path of the duplex unit 8 and the reversing unit 5 and on the fixing and discharging path, the stopped state is subjected to a paper jam, and the duplex unit 8 and the reversing unit 5 are stopped. Further, the jam codes "6", "5", and "3" corresponding to the paper jam occurrence position are sequentially transmitted from the print engine 3, and the peripheral device control device 1 sequentially receives the jam codes.

Then, following the first received jam code "1", the jam codes "6", "5", and "3" are sequentially stored in the internal RA.
It is stored in a predetermined buffer of M.

Thereafter, the peripheral device control device 1 blinks the LEDs 1, 3, 5, and 6 of the jam indicators 3b on the panel display unit 3a provided outside the printer engine 3 via the print engine 3 so that the operator can fix the jam, the FDS. (LOCT) Inform Jam and DPX Jam.

Further, the peripheral device control device 1 controls the jam codes “1”, “6”, “5”, and “5” stored in a predetermined buffer of the internal RAM.
Among the “3”, the first received jam code (first jam code) “1” is transmitted to the print engine 3, whereby the display 3c on the panel display section 3a is displayed together with the pictogram 3c ₁ of the paper jam and the jam code 3c. As “ ₂ ”, “1” is displayed to notify the first paper jam occurrence position.

Thus, the operator can recognize at a glance that the device that directly caused the error is the print engine 3 and the paper feed unit. After that, it is only necessary to investigate the paper feed unit and remove the cause of the paper jam, so that the error can be easily eliminated without wasting time.

In addition, when the paper jam that has occurred first is canceled and another paper jam still exists, the peripheral device control device 1 determines the next jam code (after jam code).
"6" is transmitted to the print engine 3, whereby "6" is displayed on the display 3c on the panel display section 3a.
Thereafter, the same processing as described above is repeated.

Further, the peripheral device controller 1 controls the jam codes “1”, “6”, “5”, and “5” stored in a predetermined buffer of the internal RAM.
The data of the device name corresponding to "3" (name of the jam occurrence position) is sequentially transmitted to the host system 2, whereby the host system 2 displays the data of the device name first received on the screen of the display device, that is, prints. Engine (paper feed path)
The names of the double-sided unit, the reversing unit, and the print engine (fixed paper discharge path) can be displayed sequentially.

Therefore, it is convenient that the operator can be sequentially notified of the device (position) where the paper jam has occurred first and the device where the paper jam has occurred subsequently by using a character string.

FIG. 4 is a system block diagram of a printer system showing another embodiment of the present invention, wherein the same units as those shown in FIG. 1 are denoted by the same reference numerals.

In the system table 20, instead of the peripheral device control device 1 shown in FIG. 1, a user controller 101 and a system controller 102, each of which is connected to the host system 2 and performs almost the same function, are provided. It is stored.

The user controller 101 generates character information or image information based on character information or image information input from the host system 2 in accordance with an application to be used (in the case of data such as a character code or image data, the character information or image information or the like is created). In response to this, it sends it to the video controller 103 of the print engine 3 via the system controller 102, and sets the mode of each of the units 3 to 8.

The system controller 102 has a built-in micro computer, and includes a user controller 101 and units 3 to 8.
It exchanges information with each other through the interface, sends out commands for controlling the respective units 3 to 8, and controls the entire system.

The system controller 102 receives a jam code from the unit where the paper jam has occurred on the transport path of each of the units 3 to 8 when the paper jam has occurred, and displays the jam code on the panel display unit 3a. And transmits data such as a device name corresponding to the jam code to the host system 2.

Although not shown in FIG. 1, the print engine 3 includes a video controller 103, a sequence controller 104, and an image forming unit (the laser writing unit 30, the photosensitive drum 31, and the like) 105 constituting an engine driver. A panel display unit 3a (see FIG. 3) is provided on the front panel.

Then, when the video controller 103 receives character information and the like from the user controller 101 via the system controller 102, the video controller 103 sends it to the image forming unit 105 in synchronization with the write timing.

The sequence controller 104 includes the print engine 3
And the sequence control of the large-volume sheet feeding unit 4 is performed.

Each of the option units 4 to 8 is independently controlled by the built-in CPU (control unit) as described above, but the timing and state of the entire system are controlled by the system controller 102.

Therefore, the same operation and effect as those of the printer system configured as shown in FIG. 1 can be obtained with the printer system configured as described above.

By the way, in each embodiment, the example in which the panel display section 3a shown in FIG. 3 is provided in the print engine 3 and the jam display according to the present invention is performed using the panel display section 3a has been described. The display is not limited to 3a and may be displayed on a display panel as shown in FIG. 5 (first display) and FIG. 6 (second display).

Therefore, the paper jam display on each display unit when the display panel shown in FIGS. 5 and 6 is used will be described.

The first display unit 110 shown in FIG.
11 and a jam occurrence position (unit) display section 112,
The jam occurrence display unit 111 makes the illustrated jam pattern visible by turning on an LED when a paper jam occurs.

The jam occurrence position display unit 112 is a one-digit number display using 7-segment cement LEDs, and displays the first paper jam occurrence position by number.

The second display unit 120 shown in FIG. 6 has eight LEDs showing the position or unit (each paper transport path) where the jam paper exists in the schematic diagram showing the configuration of this system.
Is provided (substantially the same as the jam indicator 3b in FIG. 3).

It should be noted that the numbers assigned to the LEDs of the jam indicator 121 indicate the unit 3 to 3 indicating the paper jam occurrence position.
8 shows the jam code owned by the device.

The names of the paper jams in which the LEDs 1 to 8 blink or light up are as follows.

1: Paper feed jam 2: Conveying jam 3: Fixing jam 4: LCIT jam 5: FDS jam 6: DPX jam 7: Sorter jam 8: LCOT jam Although a large number of display means are provided in addition to the display means described above, the description is omitted because it is not directly related to the present invention.

Here, this display panel, that is, the first and second display units 11
The operation according to 0,120 will be described.

When a paper jam occurs in the paper transport path shown in FIG. 2, a jam code is transmitted from a unit corresponding to the position where the paper jam occurs, and the jam code is received by the peripheral device control device 1 (or the system controller 102). Are performed (the description is omitted here), and the following display is performed on the first and second display units 110 and 120.

That is, the jam occurrence display unit 1 in the first display unit 110
11 is turned on, and a jam code corresponding to the first paper jam occurrence position is displayed on the jam occurrence position display unit 112.

Regarding paper jam occurrences,
Each LED 1 to 8 of the jam indicator 121 on the display unit 120
Among them, all the LEDs corresponding to the paper jam occurrence position are turned on.

Thereby, the operator can confirm the unit (position) directly causing the error, so that the error can be eliminated quickly and accurately.

As a display means for knowing the first paper jam occurrence position, the LCD display 3c shown in FIG. 3 or the jam occurrence position display unit 1 of the first display unit 110 shown in FIG.
In FIG. 12, the jam code corresponding to the first paper jam occurrence position is displayed. Alternatively, for example, the following code may be displayed.

That is, among the LEDs in the jam indicator 3b or 121 shown in FIGS. 3 and 6, the LED corresponding to the first sheet jam occurrence position is turned on and off, and the subsequent sheet jam occurrence position is indicated by the corresponding LED. (One or more) are continuously turned on (hereinafter simply referred to as “lighting”).

Further, in the indicator as described above, two LEDs (for example, red and green) having different colors are provided at the positions indicating the respective sheet transport paths, and the first sheet jam occurrence position corresponds to one of the positions corresponding to the position. The LED (red) is turned on, and for the subsequent paper jam occurrence position, the other corresponding LED (green) is turned on.

Further, in the indicator as described above, two-color light-emitting LEDs (for example, red and green) are provided at positions indicating the respective sheet transport paths, and the LED corresponding to that position emits red light for the first paper jam occurrence position. Then, for the paper jam occurrence position thereafter, the LED corresponding to that position emits green light.

Even with such display, the same effect as described above can be obtained.

Although the embodiment in which the present invention is applied to the laser printer system has been described above, the present invention is not limited to the laser printer, but various printer systems such as an LED printer, a liquid crystal shutter printer, an ink jet printer, or a high-function copier. The present invention can be applied to an image forming system such as a high-performance fax.

〔The invention's effect〕

As described above, according to the present invention, when an error (paper jam) occurs in the image forming system, the device that caused the error can be easily determined, and the error state can be promptly determined. Can be eliminated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention, FIG. 2 is a schematic diagram showing a schematic configuration of a mechanism section of a printer system which is a more specific embodiment of the present invention, and FIG. 1 is an external view showing a specific example of a panel display unit, FIG. 4 is a system block diagram of a printer system showing another embodiment of the present invention, and FIGS. 5 and 6 are configurations of other panel display units. It is an external view of the 1st display part and the 2nd display part which show an example. DESCRIPTION OF SYMBOLS 1 ... Peripheral device control device 2 ... Host system 3 ... Image forming apparatus (print engine) 3a ... Panel display part 3b ... Jam indicator 3c ... LCD (liquid crystal) display 4 ... Large amount paper feeder (High-volume paper feed unit) 5 Reversing paper discharge device (reversal unit) 6 Multi-stage paper discharge device (multi-stage paper discharge unit) 7 Large-volume paper discharge device (large-volume paper discharge unit) 8 Double-sided conveyance device (Double-sided unit) 20 System table 101 User controller 102 System controller 110 First display unit 111 Jam occurrence display unit 112 Jam occurrence position display unit 120 Second display unit 121 …… Jam indicator

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41J 29/42 B41J 29/46 B41J 29/38

Claims (1)

(57) [Claims] An image forming system capable of transporting a plurality of sheets on a transport path at a time, wherein if a paper jam occurs during transport of a plurality of sheets on the transport path, the sheet remains on the transport path. An image forming system provided with means for displaying in a different manner the jam occurrence positions of all of the sheets and the first sheet jam occurrence position that caused the sheet jam.