JP2011242501A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus having a constitution for displaying a processing conveyance direction of a jammed paper by display means.SOLUTION: The image forming apparatus comprises: an image carrier capable of carrying a toner image; transfer means for transferring the toner image carried by the image carrier to a transfer material; a pair of registration rollers disposed upstream of the position of the transfer means in the conveying direction of the transfer material; fixing means disposed downstream of the position of the transfer means in the conveying direction of the transfer material; a plurality of conveyance roller pairs disposed in a conveyance path of the transfer material, the path in which paper fed by paper feeding means is subjected to a fixing step and the paper is discharged to the outside of the apparatus; control means; and display means. The control means causes the display means to display the processing and conveying direction corresponding to a state of jamming when the transfer material is jammed.

Description

  The present invention relates to an image forming apparatus such as a copying machine and a printer, and more particularly to an image forming apparatus improved so that a jamming process of a transfer material can be easily performed.

  In an image forming apparatus such as a copying machine or a printer that forms an image using electrophotography, for example, a toner image is formed by performing charging, exposure, and development processes on an image carrier formed of a photosensitive drum. Next, the toner image is transferred to a transfer material such as a sheet by the action of the transfer unit, or, for example, after the toner image is transferred to an intermediate transfer belt as a second image carrier, the transfer material is transferred via the transfer unit. (Secondary transfer).

  In such an image forming apparatus, there is a problem that a transfer material (hereinafter, referred to as a sheet for convenience of explanation) jams on the conveyance path (meaning paper jam) due to various factors such as an environmental change in the apparatus. It was. For example, a sheet conveyed with a bend may hit the machine part and be torn, may be wound around a fixing roller, or may become accordion-like and cannot be conveyed. The paper conveyed according to the image forming process is monitored by, for example, a control unit that receives a detection signal of a paper detection sensor arranged on the conveyance path, a count value by a timer, and the like. When the control means determines that an abnormal situation has occurred, the power of the apparatus is cut off via the control means, the occurrence of a jam is notified to the user, and when the jam processing is completed, the apparatus can again form an image. Will be automatically restored.

  As the frequency of jam occurrence, there is a tendency that it frequently occurs in the vicinity including a fixing unit or a transfer unit (including a secondary transfer region) having two fixing rollers. There are many proposals related to the processing of such jammed paper. For example, Patent Document 1 discloses an image forming apparatus including a jam processing control related to a fixing device adopting an induction heating method. Here, when an abnormality is detected during execution of the printing process, it is determined whether or not the position of the sheet is a predetermined distance or more from the fixing unit. When the sheet is longer than a predetermined distance, the control unit functions to cut off the driving of the driving roller and stop the fixing roller after the temperature rise of the fixing roller stops. If the sheet is within a predetermined distance, in other words, when the sheet has reached the fixing roller, the control means functions to stop the rotation of the fixing roller immediately after the abnormality is detected. Further, the above-described image forming apparatus includes a notification unit that notifies the user to remove the sheet after stopping the rotation of the conveyance roller, the fixing roller, and the like.

  Patent Document 2 discloses a sheet conveying apparatus that can automatically return from a jammed state. Specifically, when the detection unit detects a jam of the sheet conveyed by the conveyance unit, the control unit controls the conveyance unit so as to convey the sheet in a direction opposite to the conventional conveyance direction.

JP 2009-198933 A Japanese Unexamined Patent Publication No. Hei 6-29897

  The jam handling technology disclosed in Patent Documents 1 and 2 seems to be useful. However, the technique disclosed in Patent Document 1 relates to a jam handling technique unique to an image forming apparatus employing an induction heating type fixing device. In addition, the notification means for notifying the user of the jam is not in the range of the prior art just by displaying that an abnormality has occurred.

  Further, the technique disclosed in Patent Document 2 is made from the viewpoint of avoiding the risk of returning a device failure to the user, and regardless of the form of the jam, the direction opposite to the transport direction. The sheet is processed and conveyed. And there is no particular suggestion about the display related to jams.

  By the way, the jam processing is generally performed by the user, and the user who intends to execute the jam processing generally determines a method that is easy to handle by checking the place where the jam occurs and the state of the jam. is there. In addition, there are a plurality of types (forms) of jam as described above, and there is a fear that the processing method may be wrong depending on the user. For example, as shown in FIG. 6, when a paper jam occurs around the fixing roller, if the fixing roller is rotated in the paper transport direction, the paper is removed only by increasing the paper winding amount. I can't. Even if you notice a mistake in the processing method, it will take time and effort.

  Further, as shown in FIG. 7, an accordion-like jam may be caused immediately after the leading edge of the paper passes between the fixing rollers. In this case, it is possible to remove the sheet by rotating the fixing roller in the conveyance direction of the sheet or in the direction opposite to the conveyance direction. However, in the latter process, the roller surface is damaged. Even this level of jam handling can sometimes make mistakes. Other types of jams include jams in other forms (when there is no deformation of the paper and a conveyance error occurs due to slippage of the conveyance roller), the user can determine the processing conveyance direction of the jammed paper. Sometimes it is impossible. On the other hand, the actual situation is that it is not possible to make the jam processing easy according to the state of the jam.

  The present invention has been made in view of the above situation, and a main object thereof is to provide an image forming apparatus having a configuration in which the processing conveyance direction of jammed paper is displayed by a display unit.

  The present invention can be achieved by the following constitutional requirements.

1. An image carrier capable of carrying a toner image;
Transfer means for transferring the toner image carried on the image carrier to a transfer material;
A pair of registration rollers provided on the upstream side of the position of the transfer means in the transfer direction of the transfer material;
Fixing means provided on the downstream side of the position of the transfer means in the transfer direction of the transfer material;
A plurality of conveyance roller pairs provided in a conveyance path of the transfer material that is fed by a sheet feeding unit, fixed by the fixing unit, and discharged out of the apparatus;
Control means;
An image forming apparatus having display means,
When the transfer material is jammed, the control unit causes the display unit to display a processing conveyance direction of the transfer material according to a jam state.
An image forming apparatus.

  2. When the jam of the transfer material is a jam around the fixing unit, the control unit causes the display unit to display an indication that the transfer material is transported upstream and processed as the processing transport direction. 2. The image forming apparatus as described in 1 above, wherein

  3. The control means indicates that when the jam of the transfer material is an accordion jam after the front end side of the transfer material passes through the fixing means, the transfer material is conveyed and processed downstream as the processing conveyance direction. 2. The image forming apparatus as described in 1 above, wherein the image is displayed on the display means.

4). An image carrier capable of carrying a toner image;
Transfer means for transferring the toner image carried on the image carrier to a transfer material;
A pair of registration rollers provided on the upstream side of the position of the transfer means in the transfer direction of the transfer material;
A pair of fixing rollers provided on the downstream side of the transfer means in the transport direction of the transfer material;
A plurality of conveyance roller pairs provided in a conveyance path of the transfer material that is fed by a sheet feeding unit, fixed by the fixing roller, and discharged out of the apparatus;
A processing transport mechanism for processing jammed transfer material;
Have
The processing transport mechanism is
An operation knob,
A specific roller related to the jammed transfer material is driven by one of the two power transmission systems selectively formed according to the rotation direction of the operation knob.
An image forming apparatus having the configuration.

5). The fixing unit includes a first fixing roller and a second fixing roller that rotate while being pressed against each other, and
It has a processing transport mechanism for jam processing that transmits driving force to any one of the specific rollers,
The processing transport mechanism is
An operation knob,
A first power transmission system having a gear train in which a one-way clutch is arranged to rotate the specific roller in a first direction when the operation knob is rotated in the forward direction;
A second power transmission system having a gear train in which a one-way clutch is arranged to rotate the specific roller in a second direction when the operation knob is rotated in the reverse direction;
Including
The image forming apparatus according to any one of claims 1 to 3, wherein the control unit causes the display unit to display a rotation direction of the operation knob corresponding to a processing conveyance direction of the transfer material.

  6). The control unit conveys the transfer material upstream as the processing conveyance direction when the jam of the transfer material is a jam in a state where the leading end position of the transfer material is between the registration roller and the transfer unit. 2. The image forming apparatus as described in 1 above, wherein a display for processing is displayed on the display means.

  7). When the jam of the transfer material is a jam in a state where the leading end position of the transfer material exceeds the transfer means, the control means displays that the transfer material is conveyed and processed downstream as the processing conveyance direction. 2. The image forming apparatus as described in 1 above, wherein the image is displayed on the display means.

8). A specific conveyance roller for jam processing is provided in association with any one of the pair of registration rollers,
The processing transport mechanism is
An operation knob,
A first power transmission system having a gear train in which a one-way clutch is arranged to rotate the specific roller in a first direction when the operation knob is rotated in the forward direction;
A second power transmission system having a gear train in which a one-way clutch is arranged to rotate the specific roller in a second direction when the operation knob is rotated in the reverse direction;
Including
8. The image forming apparatus according to claim 1, wherein the control unit causes the display unit to display a rotation direction of the operation knob corresponding to a processing conveyance direction of the transfer material. .

  In the image forming apparatus according to the present invention, when the transfer material (paper) is jammed, the transfer material processing / conveying direction according to the jam condition is displayed on the display means, so that the user executes processing according to the display. Therefore, it is possible to easily and quickly remove the paper.

1 is a schematic diagram illustrating a configuration of a digital image forming apparatus. It is a figure which shows the outline of a process conveyance mechanism. It is a figure which shows the outline of a process conveyance mechanism. FIG. 6 is a conceptual diagram for explaining a process for a jam that occurs in the vicinity of a transfer region. It is a conceptual diagram for demonstrating the process when a jam generate | occur | produces in the vicinity of the place where the jam process area is limited. FIG. 10 is a diagram illustrating a state in which a paper jam occurs around a fixing roller. FIG. 6 is a diagram illustrating a state where an accordion-like jam has occurred in a fixing unit. It is a figure for demonstrating the display means in an operation display part.

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

  FIG. 1 is a schematic diagram showing a configuration of a digital image forming apparatus according to an embodiment of the present invention. The image forming apparatus H has an automatic document feeder ADF at the top of the apparatus main body. Further, the main body includes an image reading unit 1, an image writing unit 2, an image forming unit 3, an operation display unit 4, a paper feeding unit 5, and a conveyance path switching unit 6 for switching a sheet conveyance path. Further, a reversing / reconveying unit 7 having a paper reversing unit 70 for reversing the paper and a reconveying path unit 75 for the reversed paper, a fixing unit T, a control unit C1, and the like are provided.

  The automatic document feeder ADF includes a document placing table 90, a document separating / conveying means 91, a drum-shaped document conveying means 92, a document discharging means 93, a document discharging tray 94, a document reversing means 95, and the like.

  The image reading means 1 includes a first mirror unit 11 composed of a lamp 100 and a mirror 111, a second mirror unit 13 composed of a V-shaped mirror, and an image pickup device composed of a line-shaped CCD for reflecting the original reflected light from the second mirror unit 13. 17 includes an imaging lens 15 that forms an image. The image writing unit 2 includes a laser writing unit including a laser light source and a polygon mirror.

  The image forming unit 3 includes an image carrier 31, a charging unit 32 provided around the image carrier 31, a developing unit 34 containing a two-component developer composed of a nonmagnetic toner and a magnetic carrier, a transfer unit (Transfer electrode) 35, separation means (separation electrode) 36, cleaning means 37, and the like.

  The operation display unit 4 includes display means 40 (synonymous with the display unit: see FIG. 8) made of liquid crystal in addition to a numeric keypad for setting the number of image formations and an image formation start button (hereinafter referred to as a print button). . The display means displays the processing conveyance direction (upstream side, downstream side) of the jammed paper. In other words, the display by the display means is an instruction to the user who is going to handle the jam, and the user is concerned with the fixing roller, registration roller, or other related roller in order to transport the paper in the processing transport direction according to the display. The transport roller is driven. “Upstream side” refers to the direction in which the paper is sent with reference to the jam occurrence location (synonymous with the paper stop location), and “downstream” refers to the opposite direction with respect to the jammed paper handling direction. Point to. A mechanism for processing and conveying the paper will be described in detail later.

  As an example of the display, for example, when the jam state is an accordion-shaped jam (hereinafter referred to as accordion jam) that occurs immediately after the leading edge of the sheet passes between the fixing rollers, as shown in FIG. As shown in FIG. 8, the display means 40 displays “1. Please transport and process the paper downstream”. Here, “1” is an identification number assigned to the fixing unit or a processing conveyance mechanism of the fixing unit described later. In addition, the indication “Please convey the paper downstream and process it” has the same meaning, but it may be associated with the processing conveyance mechanism and indicate the rotation direction of the operation knob. Symbols, words, etc. can be determined as appropriate. For example, in accordance with the above display, “1. right rotation” or “1. left rotation” can be displayed.

  Returning to the configuration shown in the figure, the paper feed unit 5 is provided with three paper storage means 51, 52, 53 of the cassette type or tray type. The sheet feeding means 511, 512, and 513 are provided. P indicates paper stored in the paper storage means 51, 52, 53. Reference numeral 55 denotes a manual sheet feeding unit, which indicates a sheet feeding unit 514.

  The transport path switching unit 6 transports the sheet that has passed through the fixing unit T in the horizontal direction, and discharges the sheet to the tray 64 via the discharge roller 63 or guides the sheet that has passed through the fixing unit T in the lower direction. 600 and a conveyance roller pair 610 that can rotate forward and backward. Hereinafter, unless otherwise specified, a plurality of transport roller pairs including the transport roller pair 610 and provided in the paper transport path may be simply referred to as transport rollers.

  The fixing unit T includes a first fixing roller T1 having a built-in heat source, and a second fixing roller T2 that rotates while being in pressure contact with the first fixing roller T1. A registration roller 39 is driven and controlled at a timing synchronized with the image forming process of the image forming unit 3 and feeds the paper P toward the transfer unit 35 or the transfer region.

  As understood from the above configuration, the sheet in the double-sided image forming mode connects the registration roller 39, the transfer unit 35, the fixing unit T, the switching guide 600, the sheet reversing unit 70, the re-conveying path unit 75, and the registration roller 39. It is transported on a circulating transport path.

  Next, the operation of the image forming apparatus will be briefly described.

  The originals placed on the original placing table 90 are sent one by one to the original conveying means 92 by the original separating means 91, read by the image reading means 1 at the original image reading position, and then original by the original discharge means 93. The paper is discharged onto a paper discharge tray 94. When there are images on both sides of the document, the document from which the single-sided image has been read is guided to the document reversing means 95 by a conveyance path switching member (no reference numeral), and the trailing end forms the document reversing means. The conveyance is stopped while being sandwiched between the pair of rollers. Next, the original reversing unit 95 is rotated in the reverse direction so as to be subjected to the action of the document conveying unit 92, read by the image reading unit 1, and then discharged to the document discharge tray 94.

  The image reading means 1 is a means for reading a document image to obtain image data. The document image irradiated with the lamp 100 is converted into a first mirror unit 11, a second mirror unit 13, and an imaging lens 15. Through the image sensor 17. The signal output from the image sensor 17 is A / D converted by the image processing unit of the control unit C1, and after processing such as shading correction and image compression, it is stored as image data in the memory M1. The image writing means 2 scans (dot exposure) the surface of the image carrier 31 based on the image data called from the memory M1. At this time, the surface of the image carrier 31 is uniformly charged in advance by the charging means 32, and an electrostatic latent image corresponding to the original image (hereinafter simply referred to as the image image) according to the movement (rotation) of the image carrier in the sub-scanning direction. A latent image) is formed. The latent image is reversely developed by the developing unit 34 and converted into a toner image.

  Next, the sheet feeding unit 55 or the sheet P fed from the sheet feeding unit 5 is rotated by the registration roller 39 so as to overlap with the toner image area on the image carrier 31 as described above. It is sent out toward the transfer area. In the transfer area, the toner image formed on the surface of the image carrier 31 is transferred to the sheet P by the action of the transfer means 35, and is separated from the surface of the image carrier 31 by the action of the separation means 36. Sent to.

  The toner image is fixed on the paper P by the heating / pressurizing action of the fixing unit T, and is discharged onto the tray 64 via the discharge roller 63. Alternatively, after the conveyance path is changed by the switching guide 600 and conveyed in the downward direction, the conveying roller 610 is stopped in a state where the rear end is held between the conveyance rollers 610, and then the conveyance roller 610 rotates in the reverse direction along the left side of the switching guide 600. And is discharged to the outside through the discharge roller 63.

  In addition, when the double-sided image forming mode for forming images on both sides of the sheet is selected by the operation display unit 4, the sheet P on which the image is formed on the first side passes through the fixing unit according to the conveyance path switching by the switching guide 600. It is transported downward. Next, after being reversed in the sheet reversing unit 70, after being guided to the registration roller 39 through the re-conveying path unit 75, an image is formed on the second surface by the same method as described above, and after fixing, the state is left as it is. It is discharged to the tray 64 or discharged after being inverted.

  As is well known, in the image forming process described above, the surface of the image carrier 31 after passing through the transfer region is cleaned by the cleaning unit 37 and is prepared for the next image formation.

  The control unit C1 described above performs all the controls including the process control of the image forming unit 3, the temperature control of the fixing unit T, the paper feed / conveyance control, and the display by the display unit when a jam occurs. The control means C1 is a computer system including a CPU (CPU1), a memory M1, and an arithmetic unit, an I / O port, a communication interface, etc. (not shown in the figure), and circuits for driving each means. Have. The control of each means is performed by executing the program stored in the memory M1. Further, the control means C1 is connected to a LAN or a public line via a communication means, and can exchange data with other information devices.

  Here, sheet conveyance control will be described. In FIG. 1, SE1, SE2, SE3, SE4, and SE5 indicate sheet detection sensors (hereinafter simply referred to as sensors). The sensor SE1 is disposed in the vicinity of the upstream position of the registration roller 39, and when the paper fed from the paper storage means is not detected by the sensor SE1 within a predetermined time, the control means C1 determines that an abnormality has occurred, and the apparatus The power system of is stopped. When the sheet detection signal from the sensor is taken into the control unit C1 within a predetermined time, the control unit C1 continues the image forming process.

  In the present embodiment, the driving of the conveying roller 38, the registration roller 39, the conveying belt BE, the second fixing roller, etc. is performed by a dedicated motor.

  The paper P with the leading edge held between the registration rollers by normal paper feeding / conveyance is re-fed with the start of rotation of the registration rollers whose driving is controlled at a timing according to the image forming process. The sensor SE2 is disposed in the vicinity of the upstream position of the transfer means 35. If the paper after refeeding is not detected by the sensor SE2 within a predetermined time, the drive system of the apparatus is stopped via the control means C1, Otherwise, the image forming process is continued. Similarly, if the sheet detected by the sensor SE2 is not detected by the sensor SE3 within a predetermined time, or if the sheet is not detected by the sensor SE4 within the predetermined time after detection by the sensor SE3, the power system of the apparatus Is stopped, and if normal, the image forming process continues.

  As described above, the sheet conveyance control in the present embodiment is based on the output signal of the sensor provided in a preferable place for detecting the occurrence of jam on the sheet conveyance path and the count value by the timer in the control means. It is executed by monitoring with the control means C1. The sensor SE5 is a sensor that is provided toward the circumferential surface of the first fixing roller 81 and detects a winding abnormality of the sheet with respect to the circumferential surface of the first fixing roller. When the control means C1 determines that the output change of the sensor SE5 is due to the paper winding, the drive system of the apparatus is stopped via the control means C1.

  Next, a processing conveyance mechanism (also referred to as a processing conveyance unit) for removing the jammed paper will be described. 2 and 3 are diagrams showing an outline of the processing conveyance mechanism. FIG. 2 shows that the first power transmission system is completed for the target means (member). FIG. 3 shows the second power transmission. Indicates that the system is complete.

  In the drawing, the processing transport mechanism 8 includes an operation knob 81, a knob shaft 82 integrally formed with the operation knob 81, a first gear 83 and a second gear provided on the knob shaft 82 via a one-way clutch (not shown). 84. Furthermore, a third gear 85 that meshes with the first gear 83 and a fourth gear 86 that meshes with the second gear 84, and a fifth gear 87 that selectively meshes with the second gear 84 and the fourth gear are provided. . The fifth gear 87 is configured to be rotatable integrally with one roller (hereinafter, also referred to as a specific roller) 800 of a pair of conveyance rollers that are in a relationship of sandwiching jammed paper. The term “conveying roller pair” as used herein is a general term for the fixing rollers (T1, T2), the registration rollers 39, and the conveying rollers provided on the sheet conveying path, particularly in places where there is a risk of jam occurrence.

  The one-way clutch provided in association with each of the first gear 83 and the second gear 84 is configured to be coupled to the knob shaft 82 when rotated in opposite directions. Then, the rotational power through the manually operated operation knob 81 is transmitted to the third gear 85 and the fourth gear 86, and finally the specific roller 800 is rotated left or right through the fifth gear 87. As understood from the above, a gear train including the first gear 83, the third gear 85, and the fifth gear 87 via the operation knob 81 and the knob shaft 82 constitutes the first power transmission system. Similarly, a gear train including the second gear 84, the fourth gear 86, and the fifth gear 87 via the operation knob 81 and the knob shaft 82 constitutes the second power transmission system, and these two power transmission systems are selected. Therefore, it will be used for jam handling operation.

  The third gear 85 and the fourth gear 86 are configured to mesh with the fifth gear 87 through a pendulum operation according to the rotation direction of the operation knob 81, but other forms may be used and the degree of freedom in design is wide. With the above configuration, for example, when the paper P and the paper jammed with respect to the direction of the long arrow indicating the paper conveyance direction are processed and conveyed in the first direction on the upstream side (right side), the operation knob 81 is moved in the opposite direction. Rotate clockwise (for example, counterclockwise: this is called forward rotation).

  Further, when the jammed paper is processed and conveyed in the second direction which is the downstream side, the operation knob 81 is rotated in the clockwise direction (right rotation: for example, this is called the reverse direction rotation) which is the opposite direction to the above. Can be achieved. Regarding the display, in the case of the jam processing of the mode shown in FIG. 6, the operation knob 81 is rotated counterclockwise to convey the paper P to the upstream side, and in the case of the jam processing of the mode shown in FIG. Is displayed on the display means 40 so as to convey the paper P downstream and remove it.

  There are jams of the type (state) as shown in FIG. FIG. 4 is a conceptual diagram for explaining processing related to a jam that may occur in a nearby region including the transfer region in FIG. In the figure, the same reference numerals are given to the means (members) already described. In the figure, P is a sheet, P1 indicates that the leading end position of the sheet when the apparatus is stopped due to the occurrence of a jam is between the registration roller 39 and the transfer unit 35, and P2 indicates that the leading end position of the sheet is the separating unit 36 or It indicates that the position is beyond the transfer means 35. Reference numeral 8 denotes a processing conveyance means which is mechanically connected to the registration roller 39 (meaning the specific roller described above). In such a jam, regarding the former aspect, for example, the display means 40 described above “2. Transport paper to the upstream side for processing” or “2. Rotate left”. Here, “2” indicates an identification number given to the processing conveyance mechanism of the registration unit or registration roller unit, and “left rotation” indicates the rotation direction of the operation knob 81 as described above. The upstream side includes constituent members such as the transfer means 35 on the downstream side from the leading end of the paper P, and is intended for the ease of paper removal operation. On the other hand, in the latter mode, for example, the display means 40 displays "2. Please transport the paper downstream and process it". On the downstream side, an unfixed toner image is transferred onto the paper in a region beyond the transfer area, and when the paper P is conveyed upstream, the toner powder is rubbed by rubbing between the image carrier and the paper P. This is because the transfer means (transfer electrode) 35 may be scattered and contaminated. The front end position of the sheet can be calculated by the control means C1, and the display relating to the processing conveyance direction is performed based on the result.

  Display data and the like can be stored in a memory in the control means C1 so that they can be taken out.

  Next, a case where the processing conveyance direction is considered in relation to the relationship between the plurality of conveyance roller pairs and the length in the sheet conveyance direction will be described with reference to the display. The slippage between the transport roller and the paper makes it impossible to transport the paper, and the apparatus may be stopped. In such a case, for example, it is necessary to remove the sheet remaining on the sheet conveyance path in the same manner as the jam at the specific location described above due to the occurrence of an abnormality.

  FIG. 5 is a conceptual diagram showing a case where a jam due to a paper feed failure occurs particularly in the vicinity of a place where the jam processing section of the apparatus is limited. In the figure, the same reference numerals are given to the means (members) already mentioned. In the figure, it is assumed that the paper is conveyed from right to left. In FIG. 5A, the length of the paper P in the transport direction is relatively long, and a pair of transport rollers (b), (b) on one side constituting the first jam processing section JM1 and the second jam processing section JM2. ). FIG. 5B shows a case where the paper P is sandwiched between the pair of transport rollers (A) and (B) constituting the first jam processing section JM1. FIG. 5C shows a case where the length of the sheet in the conveyance direction is short and is sandwiched between conveyance roller pairs (b).

  The display on the display means 40 relating to the processing and conveying direction of the sheet from the state shown in FIG. 5A is the display as described above to “convey and process upstream”. This is because even if the paper is transported to the downstream side via the processing transport mechanism 8, only the leading edge of the paper appears in the jam processing space JM2, so that the processing is difficult. This is because it can be discharged to the first jam processing space JM1.

  The display on the display means 40 relating to the processing and conveying direction of the sheet from the state of FIG. 5B displays that "after downstream conveyance → convey upstream and process". This is because the rear end of the sheet is nipped by the rightmost pair of transport rollers (A), and therefore, it is easier to process the sheet once transported downstream to release the rear end nip state.

  The display on the display means 40 related to the paper processing and conveyance direction from the state of FIG. 5C is the display as described above to “convey and process upstream”. This is because the sheet cannot be removed if the sheet is conveyed downstream.

DESCRIPTION OF SYMBOLS 1 Image reading means 2 Image writing means 3 Image forming means 35 Transfer means 39 Registration roller 4 Operation display part 40 Display means 5 Paper feed part 8 Processing conveyance mechanism (processing conveyance means)
81 Operation knob 82 Knob shaft 83 1st gear 84 2nd gear 85 3rd gear 86 4th gear 87 5th gear C1 control means T fixing means

Claims (8)

An image carrier capable of carrying a toner image;
Transfer means for transferring the toner image carried on the image carrier to a transfer material;
A pair of registration rollers provided on the upstream side of the position of the transfer means in the transfer direction of the transfer material;
Fixing means provided on the downstream side of the position of the transfer means in the transfer direction of the transfer material;
A plurality of conveyance roller pairs provided in a conveyance path of the transfer material that is fed by a sheet feeding unit, fixed by the fixing unit, and discharged out of the apparatus;
Control means;
An image forming apparatus having display means,
When the transfer material is jammed, the control unit causes the display unit to display a processing conveyance direction of the transfer material according to a jam state.
An image forming apparatus.   When the jam of the transfer material is a jam around the fixing unit, the control unit causes the display unit to display an indication that the transfer material is transported upstream and processed as the processing transport direction. The image forming apparatus according to claim 1, wherein:   The control means indicates that when the jam of the transfer material is an accordion jam after the front end side of the transfer material passes through the fixing means, the transfer material is conveyed and processed downstream as the processing conveyance direction. The image forming apparatus according to claim 1, wherein the image is displayed on the display unit. An image carrier capable of carrying a toner image;
Transfer means for transferring the toner image carried on the image carrier to a transfer material;
A pair of registration rollers provided on the upstream side of the position of the transfer means in the transfer direction of the transfer material;
A pair of fixing rollers provided on the downstream side of the transfer means in the transport direction of the transfer material;
A plurality of conveyance roller pairs provided in a conveyance path of the transfer material that is fed by a sheet feeding unit, fixed by the fixing roller, and discharged out of the apparatus;
A processing transport mechanism for processing jammed transfer material;
Have
The processing transport mechanism is
An operation knob,
A specific roller related to the jammed transfer material is driven by one of the two power transmission systems selectively formed according to the rotation direction of the operation knob.
An image forming apparatus having the configuration. The fixing unit includes a first fixing roller and a second fixing roller that rotate while being pressed against each other, and
It has a processing transport mechanism for jam processing that transmits driving force to any one of the specific rollers,
The processing transport mechanism is
An operation knob,
A first power transmission system having a gear train in which a one-way clutch is arranged to rotate the specific roller in a first direction when the operation knob is rotated in the forward direction;
A second power transmission system having a gear train in which a one-way clutch is arranged to rotate the specific roller in a second direction when the operation knob is rotated in the reverse direction;
Including
4. The image forming apparatus according to claim 1, wherein the control unit causes the display unit to display a rotation direction of the operation knob corresponding to a processing conveyance direction of the transfer material. 5.   The control unit conveys the transfer material upstream as the processing conveyance direction when the jam of the transfer material is a jam in a state where the leading end position of the transfer material is between the registration roller and the transfer unit. The image forming apparatus according to claim 1, wherein a display for processing is displayed on the display unit.   When the jam of the transfer material is a jam in a state where the leading end position of the transfer material exceeds the transfer means, the control means displays that the transfer material is conveyed and processed downstream as the processing conveyance direction. The image forming apparatus according to claim 1, wherein the image is displayed on the display unit. A specific conveyance roller for jam processing is provided in association with any one of the pair of registration rollers,
The processing transport mechanism is
An operation knob,
A first power transmission system having a gear train in which a one-way clutch is arranged to rotate the specific roller in a first direction when the operation knob is rotated in the forward direction;
A second power transmission system having a gear train in which a one-way clutch is arranged to rotate the specific roller in a second direction when the operation knob is rotated in the reverse direction;
Including
8. The image formation according to claim 1, wherein the control unit causes the display unit to display a rotation direction of the operation knob corresponding to a processing conveyance direction of the transfer material. apparatus.

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