JP4979471B2 - Image forming apparatus - Google Patents

Description

The present invention relates to images forming device, more particularly jammed processing sheet.

  In recent years, with the digitization of image forming apparatuses, image forming apparatuses have been increasingly combined to incorporate functions such as copying, printers, and facsimiles into one image forming apparatus. In addition, as composite processing progresses, various image forming apparatuses having built-in / connected sheet processing apparatuses that perform sheet processing such as mass stacking, sorting stacking, punching, staple binding, and bookbinding on image-formed sheets have been put into practical use. ing.

  However, from the viewpoint of usability, there is still a strong need for downsizing and space saving of the device. For this reason, in the conventional composite image forming apparatus, for example, an image reading device is arranged above the image forming apparatus main body, and the sheet is discharged into a space between the image forming apparatus main body and the image reading apparatus. There is an in-cylinder discharge method (see Patent Document 1). In such an image forming apparatus, the image-formed sheet is discharged from one side of the image forming apparatus main body to the in-body discharge space.

  By the way, in an in-cylinder discharge type image forming apparatus, there is one in which a sheet processing apparatus is arranged on the downstream side in the sheet discharging direction of the main body of the image forming apparatus. In this image forming apparatus, a sheet after image formation is transferred to the sheet processing apparatus. A relay transfer device for transferring is disposed in the in-cylinder discharge space. In the case of such an image forming apparatus, when the sheet after image formation is conveyed to the sheet processing apparatus, the sheet is branched from the path toward the in-cylinder discharge space and directed to the relay conveying apparatus. The sheet is conveyed to the sheet processing apparatus.

JP 2006-001657 A

  By the way, in such a conventional image forming apparatus, since the relay conveyance device has a sheet conveyance mechanism in its function, when a sheet is conveyed, a jam of the sheet occurs in the relay conveyance device. There is. When a jam occurs in this way, the relay conveyance device is opened to process a jam sheet.

  However, if the position of the image reading device is lowered to reduce the size of the image forming apparatus, if a sheet jam occurs in this way, a sufficient space for opening the relay conveyance device for jam processing can be secured. As a result, usability is greatly impaired.

  In addition to the sheet conveying path for conveying the sheet to the sheet processing apparatus, the relay conveying apparatus may have a sheet conveying path such as a reversing path for reversing the sheet. When a plurality of sheet conveyance paths are provided in this way, when a sheet is jammed, the user has to search for a jammed sheet from the plurality of sheet conveyance paths, which requires time and effort for the jam processing.

The present invention has been made in view of such circumstances, even when the miniaturization, it is an object to provide a picture image forming device that can of doing jam easily .

In the image forming apparatus , the image forming apparatus further includes an image forming unit that forms an image on a sheet, and a reconveying path that conveys the sheet on which the image is formed on the entire surface by the image forming unit to the image forming unit again. An image forming apparatus main body, and a sheet conveying device positioned on an upper surface of the image forming apparatus main body, wherein the sheet conveying apparatus is a first openable / closable sheet that conveys a sheet on which an image is formed by the image forming unit. A second sheet that is provided above and below the sheet conveying path and in parallel with the first sheet conveying path and that can be opened and closed by inverting and conveying the sheet to the re-conveying path. a transport path, said first sheet conveying path and of the second sheet conveying path, and opening means for selectively opening the sheet conveying path jammed sheet is present, the first sheet conveying path An openable and closable first member that constitutes an upper surface of an upper sheet conveyance path positioned above the second sheet conveyance path, a lower surface of the upper sheet conveyance path, and the first sheet conveyance path An openable and closable second member that forms an upper surface of a lower sheet conveyance path located below the second sheet conveyance path, and the opening means includes a jammed sheet in the upper sheet conveyance path In this case, when there is a jammed sheet in the lower sheet conveyance path so as to open the first member, the first member and the first member are attracted to the first member by a magnetic force. those characterized that you have configured to open integrally with the second member.

  According to the present invention, it is possible to selectively open a sheet conveyance path where a jammed sheet exists, out of a first sheet conveyance path and a second sheet conveyance path provided on the upper surface of the image forming apparatus main body. Therefore, even when the size is reduced, the jam processing can be easily performed.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration of a full-color laser beam printer which is an example of an image forming apparatus according to a first embodiment of the present invention. Reference numeral 1 denotes a full-color laser beam printer, 1A denotes a full-color laser beam printer main body (hereinafter referred to as a printer main body), 1B denotes an image forming unit that forms an image on a sheet, and 13 denotes a fixing unit.

  Reference numeral 2 denotes an image reading device installed substantially horizontally above the printer main body 1A, and 3 is arranged on one side of the printer main body 1A to stack a large amount of sheets, sort and stack, punch, and staple the sheets after image formation. The sheet processing apparatus performs processing such as bookbinding processing.

  Reference numeral 4 denotes a relay conveyance device that is a sheet conveyance device that receives an image-formed sheet S from the printer main body 1A and conveys the sheet S to the sheet processing apparatus 3. The relay conveyance device 4 is a printer main body 1A that is an image formation apparatus main body. Between the image reading apparatus 2 and the image reading apparatus 2.

  The image forming unit 1B is of a four-drum full-color system, and forms four toner images of a laser scanner 6 and four colors of yellow (Y), magenta (M), cyan (C), and black (Bk). Process cartridge 5 (5Y, 5M, 5C, 5Bk). The image forming unit 1B includes an intermediate transfer unit 7 disposed above the process cartridge 5.

  Here, each process cartridge 5 includes a photosensitive drum 51 (51Y, 51M, 51C, 51Bk). Each photosensitive drum 51 is rotatably supported at both ends by a support member, and is driven to rotate clockwise when a driving force from a drive motor (not shown) is transmitted to one end. Is done.

  The intermediate transfer unit 7 includes an intermediate transfer belt 7a wound around a driving roller 7b and a tension roller 7c. The intermediate transfer unit 7 includes a primary transfer roller 52 that is provided inside the intermediate transfer belt 7 a and is in contact with the intermediate transfer belt 7 a at a position facing the photosensitive drum 51.

  Here, the intermediate transfer belt 7a is composed of a film-like member and is disposed so as to be in contact with each photosensitive drum 51, and is rotated in the direction of an arrow by a driving roller 7b driven by a driving unit (not shown). ing. Then, by applying a positive transfer bias to the intermediate transfer belt 7a by the primary transfer roller 52, each color toner image having a negative polarity on the photosensitive drum is sequentially transferred to the intermediate transfer belt 7a. As a result, a full-color image is formed on the intermediate transfer belt.

  A secondary transfer roller 12 constituting a secondary transfer unit that transfers a full-color image formed on the intermediate transfer belt to the sheet S is provided at a position facing the drive roller 7b of the intermediate transfer unit 7. .

  Further, a fixing unit 13 is disposed above the secondary transfer roller 12, and a paper discharge roller pair 14 and a double-side reversing unit 1 </ b> C are disposed at the upper left part of the fixing unit 13. The double-side reversing unit 1C is provided with a reversing roller pair 15 that is a sheet reversing and conveying roller capable of normal and reversal, and a reconveying path R3 that conveys a sheet on which an image is formed to the image forming unit 1B again. ing.

  Next, an image forming operation of the full color laser beam printer 1 configured as described above will be described.

  First, when image information of a document is read by the image reading device 2, the image information is subjected to image processing, converted into an electrical signal, and transmitted to the laser scanner 6 of the image forming unit 1B. The image information may be input to the image forming unit 1B from an external device such as a personal computer (not shown).

  In the image forming unit 1B, the surface of the photosensitive drum 51 is scanned with a laser beam corresponding to the image information emitted from the laser scanner 6, and the surface is uniformly charged with a predetermined polarity and potential. The surface of the drum 51 is sequentially exposed to form an electrostatic latent image on the photosensitive drum. Thereafter, the electrostatic latent image is developed with toner and visualized.

  For example, the photosensitive drum 51Y is first irradiated with laser light based on the yellow component color image signal from the scanner unit 6 to form a yellow electrostatic latent image on the photosensitive drum 51Y. The yellow electrostatic latent image is developed with yellow toner from a developing device and visualized as a yellow toner image.

  Next, when this yellow toner image arrives at the primary transfer portion where the photosensitive drum 51Y and the intermediate transfer belt 7a come into contact with the rotation of the photosensitive drum 51Y, the primary transfer bias applied to the primary transfer roller 52 is reached. Thus, the toner image is transferred to the intermediate transfer belt 7a.

  Next, when the portion carrying the yellow toner image of the intermediate transfer belt 7a moves, the magenta toner image formed on the photosensitive drum 51M by the same method as described above is transferred from the yellow toner image to the intermediate transfer belt. 7a is transferred. Similarly, as the intermediate transfer belt 7a moves, the cyan toner image and the black toner image are transferred onto the yellow toner image and the magenta toner image, respectively, in the primary transfer portion. As a result, a full-color toner image is formed on the intermediate transfer belt 7a.

  In parallel with the toner image forming operation, the sheet S accommodated in the sheet feeding cassette 8 is sent out by the pickup roller 9, and the sheet S is separated one by one by the separation roller pair 10 to be registered to the registration roller pair 11. It is conveyed to. Then, the skew feeding is corrected by the registration roller pair 11 and conveyed to the secondary transfer unit so that the position of the full color toner image on the intermediate transfer belt and the sheet S is aligned at the secondary transfer unit. Thereafter, the full-color toner image is collectively transferred onto the sheet S by the secondary transfer bias applied to the secondary transfer roller 12 in the secondary transfer unit.

  Next, the sheet S on which the full-color toner image has been transferred in this manner is conveyed to the fixing unit 13, and the toner of each color is melted and mixed by receiving heat and pressure in the fixing unit 13, so that a full-color image is formed on the sheet S. It is fixed. Thereafter, the sheet S on which the image has been fixed is conveyed to the relay conveying device 4 by a discharge roller pair 14 provided downstream of the fixing unit 13.

  Next, the sheet S passes through a paper discharge conveyance path R1 provided substantially horizontally above the relay conveyance device 4 and is delivered to the sheet processing device 3, where predetermined processing is performed. After that, the sheet is discharged to the discharge tray (stacking tray) 3a with the image forming surface down.

  By the way, the full-color laser beam printer 1 of the present embodiment can form images on both sides of a sheet. When images are formed on both sides of the sheet, the sheet on which the image is formed on one side first passes through the fixing unit 13 and then is relayed and conveyed between the image reading device 2 and the reversing roller pair 15 (not shown). It is introduced into the reverse conveyance path R2 installed between the apparatuses 4.

  Next, when the trailing edge of the sheet S passes through the fixing unit 13, the reversing roller pair 15 is reversed at a predetermined timing, whereby the sheet S is reversed and conveyed to the re-conveying path R3, and then again the registration roller. Transported to pair 11. Then, image formation and fixing are performed again on the back surface, and thereafter, the paper passes through the paper discharge conveyance path R1 and is delivered to the sheet processing apparatus 3.

  By the way, as shown in FIG. 2, the image reading apparatus 2 includes an image reading apparatus main body 2b and an automatic document feeding apparatus that is disposed above the image reading apparatus main body 2 so as to be openable and closable via a hinge 2d. 2a.

  Then, when reading the document image, the automatic document feeder 2a separates and conveys the sheets one by one from the set bundle document, and passes the contact glass 2c attached to the upper surface of the image reading device main body 2b. I have to. When the document passes through the contact glass 2c as described above, the document image is read by an image reading unit (not shown) provided in the image reading apparatus main body 2b.

  When reading an original image after setting the original on the contact glass 2c, the automatic original feeder 2a is once opened and rotated with the hinge 2d as a fulcrum as shown in FIG. 2c. Thereafter, the automatic document feeder 2a is closed to press the document. That is, the automatic document feeder 2a also serves as a pressing plate for pressing the document when the document is placed on the contact glass 2c.

  On the other hand, as shown in FIG. 3, the lower surface of the image reading apparatus main body 2b is integrally provided with a sheet guide 2e constituting a reverse conveyance path R2, which is a second sheet conveyance path that can be opened and closed together with the upper surface of the relay conveyance apparatus 4. Is formed. A guide sheet metal 2f is installed at a substantially central portion of the sheet guide 2e in the sheet conveying direction indicated by an arrow so as to be orthogonal to the sheet conveying direction.

  As shown in FIG. 4, the relay conveying device 4 includes an upper guide 4a that is an openable second member whose upper surface forms the lower surface of the reverse conveying path R2, and a first sheet conveying path that can be opened and closed together with the upper guide 4a. And a lower guide 4b that constitutes the discharge conveyance path R1.

  The upper guide 4a can be opened / closed and rotated with respect to the lower guide 4b about the rotation shaft 4d. The rotating shaft 4d is provided on the same side as the hinge 2d of the image reading device 2 with respect to the printer main body 1A as shown in FIGS. The opening direction is the same as that of the transport device 4.

  In addition, a plurality of guide shapes 41 are formed on the upper surface of the upper guide 4a in parallel with the sheet conveying direction indicated by the arrows, which are paired with the sheet guide 2e that is the first member that can be opened and closed and that constitutes the upper surface of the reverse conveying path R2. Has been.

  Further, as shown in FIG. 5, a plurality of upper transport rollers 4f are disposed on the lower surface of the upper guide 4a, and a plurality of lower transport rollers 4g are disposed on the upper surface of the lower guide 4b. The upper conveyance roller 4f and the lower conveyance roller 4g are in contact with each other when the upper guide 4a is closed, and the contact is released when the upper guide 4a is opened.

  Further, the relay discharge roller pair 4e is arranged in a state shifted in the width direction on the downstream side in the sheet conveyance direction on the lower surface of the upper guide and on the downstream side in the sheet conveyance direction on the upper surface of the lower guide. Thereby, the relay discharge roller pair 4e comes into contact with the sheet S alternately in the width direction, and as a result, the sheet can be waved. Thus, even when the sheet S is curled when being discharged from the printer main body 1A, the sheet S can be discharged without being curled.

  As shown in FIGS. 4 and 5, a magnet (magnet) 4c as an opening means is provided on the upper guide 4a of the relay conveyance device 4, and a guide sheet metal 2f provided on the lower surface of the image reading apparatus main body 2b is magnetically applied. It is arranged at a position that can be adsorbed.

  Here, the magnitude of the magnetic force of the magnet is such that when there is a jammed sheet in the paper discharge conveyance path R1, the sheet guide 2e and the upper guide are in a state where the upper guide 4a of the relay conveyance device 4 is attracted to the sheet guide 2e. 4a is a size which can move integrally. Further, when there is a jammed sheet in the reverse conveyance path R2, the size is such that the suction of the upper guide 4a to the sheet guide 2e is released by the remaining sheet.

  As a result, when the image reading device 2 is opened, a force can be applied to at least the upper guide 4a of the relay transport device 4 in the direction of releasing the relay transport device 4 by the magnet 4c.

  Next, a jam process when the sheet S is jammed in the relay conveyance device 4 configured as described above will be described. When a jam of the sheet S is detected by a jam sensor (not shown), the user first lifts the image reading device 2 for jam processing.

  First, in the reverse conveyance path R2, which is an upper sheet conveyance path provided in parallel with the paper discharge conveyance path R1 and positioned above the paper discharge conveyance path R1, that is, the sheet guide 2e and the upper guide 4a of the relay conveyance device 4. Jam processing when the sheet S jams between the two will be described.

  In this case, when the user lifts the image reading device 2 for jam processing, the guide sheet metal 2f and the magnet 4c are magnetized, so that the upper guide 4a of the relay transport device 4 rotates about the rotation shaft 4d. try to.

  However, when the sheet stays between the sheet guide 2e and the upper guide 4a, the rear end portion of the sheet is nipped by the reverse roller pair 15. For this reason, even when the image reading device 2 is lifted, the sheet that is nipped by the reversing roller pair 15 exerts a force that inhibits the opening rotation on the upper guide 4a.

  Therefore, when the image reading device 2 is further lifted, the guide sheet metal 2f and the magnet 4c are demagnetized, and only the image reading device 2 rotates as shown in FIGS. When only the image reading device 2 rotates in this way, only the reverse conveyance path R2 is opened, so that the user can easily find the jammed sheet S, and further the rotation angle of the image reading device 2 Therefore, the jam processing can be easily performed.

  Next, the sheet S is provided in parallel to the reversal conveyance path R2 and in the paper discharge conveyance path R1, which is a lower sheet conveyance path positioned below the reversal conveyance path R2, that is, between the upper guide 4a and the lower guide 4b. A description will be given of jam processing when a jam occurs.

  Also in this case, the user lifts the image reading apparatus 2 for jam processing. When the image reading device 2 is lifted in this way, the guide sheet metal 2f and the magnet 4c are magnetized, so that the upper guide 4a of the relay transport device 4 tries to rotate around the rotation shaft 4d.

  At this time, since the sheet S stays on the lower surface of the upper guide 4a, the rotation of the upper guide 4a is not hindered. As a result, the image reading device 2 and the upper guide 4a are simultaneously rotated as shown in FIGS. 8 and 9 while the guide sheet metal 2f and the magnet 4c are magnetized.

  When the image reading device 2 and the upper guide 4a are simultaneously rotated in this way, only the discharge conveyance path R1 in which the sheet S stays is opened, so that the user can easily find the sheet S. Further, the nip of the upper conveyance roller 4f and the lower conveyance roller 4g is released by the rotation of the upper guide 4a, so that the jam processing can be easily performed.

  As described above, according to the present embodiment, the paper discharge conveyance path R1 or the reverse conveyance path R2 where the jammed sheet exists can be opened by only one action of opening the image reading apparatus 2. , You can access the jam sheet.

  Further, since the image reading device 2 and the relay conveyance device 4 can be integrally rotated upward, a necessary and sufficient space is provided at the time of jam processing while keeping the height of the contact glass surface low during normal image formation. Can be secured. Furthermore, since the release (division) direction of the discharge conveyance path R1 and the reverse conveyance path R2 is the same direction, the user's operation and the jam processing space can be made the same regardless of the conveyance path.

  As described above, according to the present embodiment, the sheet conveyance path where the jammed sheet exists is selectively opened in the paper discharge conveyance path R1 and the reverse conveyance path R2 provided on the upper surface of the printer main body 1A. Therefore, even when the size is reduced, the jam processing can be easily performed.

  Next, a second embodiment of the present invention will be described.

  FIG. 10 is a diagram illustrating a configuration of the relay conveyance device 4 that is a sheet conveyance device provided in the image forming apparatus according to the present exemplary embodiment. 10, the same reference numerals as those in FIG. 4 described above indicate the same or corresponding parts.

  In FIG. 10, 4h is an electromagnet as an opening means provided at the rotating end of the upper guide 4a of the relay transport device 4, and this electromagnet 4h generates a magnetic force only when a predetermined voltage is applied. is there. The electromagnet 4h is disposed at a position where it can be magnetized with the guide sheet metal 2f of the image reading apparatus 2.

  Further, as shown in FIG. 11, the lower guide 4b is provided with a jam sensor 4i which is a jam detecting means for detecting the presence or absence of the sheet S. The jam sensor 4i causes the jam of the sheet S in the discharge conveyance path R1. Is to be detected.

  The jam sensor 4i is connected to, for example, a control unit (not shown) provided in the printer main body 1A. When a jam detection signal is input from the jam sensor 4i, the control unit stops energization of the electromagnet 4h. I am doing so. When the energization of the electromagnet 4h is stopped in this way, the magnetization of the guide metal plate 2f and the electromagnet 4h is released.

  Next, a jam process when the sheet S is jammed in the relay conveyance device 4 configured as described above will be described.

  First, the jam processing when the sheet S jams in the reverse conveyance path R2, that is, between the sheet guide 2e of the image reading apparatus 2 and the upper guide 4a of the relay conveyance apparatus 4 will be described.

  When the sheet S stays between the sheet guide 2e and the upper guide 4a, this is detected by a jam detection unit (not shown). Then, the control unit detects that the sheet S is staying in the reverse conveyance path R2 based on the detection signal from the jam detection unit. In this case, since the jam sensor 4i does not detect a jam, the control unit stops (cuts off) energization of the electromagnet 4h based on this, and cancels the magnetization of the guide sheet metal 2f and the electromagnet 4h.

  In this state, when the user lifts the image reading device 2 for jam processing, the guide sheet metal 2f and the electromagnet 4h are not magnetized, so that only the image reading device 2 rotates as shown in FIG. When only the image reading device 2 rotates in this way, only the reverse conveyance path R2 is opened, so that the user can easily find the jammed sheet S, and further the rotation angle of the image reading device 2 Therefore, the jam processing can be easily performed.

  Next, a description will be given of jam processing when the sheet S is jammed in the paper discharge conveyance path R1, that is, between the upper guide 4a and the lower guide 4b of the relay conveyance device 4. FIG.

  In this case, the jam sensor 4i detects a jam. And a control part continues energization of electromagnet 4h based on a signal from this jam sensor 4i, and, thereby, guide sheet metal 2f and electromagnet 4h maintain a magnetized state. In this state, when the user lifts the image reading device 2 for jam processing, the guide sheet metal 2f and the magnet 4c are magnetized, so that the upper guide 4a of the relay transport device 4 is as shown in FIG. It rotates around the rotation shaft 4d.

  When the image reading device 2 and the upper guide 4a are simultaneously rotated in this way, only the discharge conveyance path R1 in which the sheet S stays is opened, so that the user can easily find the sheet S. Further, the nip of the upper conveyance roller 4f and the lower conveyance roller 4g is released by the rotation of the upper guide 4a, so that the jam processing can be easily performed.

  As described above, according to the present embodiment, the sheet conveyance path where the jammed sheet exists can be selectively opened out of the discharge conveyance path R1 and the reverse conveyance path R2 by energization of the electromagnet 4h. Even when the size is reduced, the jam processing can be easily performed.

  In this embodiment, the case where the jam sensor 4i is provided in the discharge conveyance path R1 has been described. However, if the jam sensor 4i is provided in at least one of the paper discharge conveyance path R1 and the reverse conveyance path R2, a jammed sheet is formed. An existing sheet conveyance path can be detected.

  In the above description, the case where the sheet processing apparatus 3 is provided on the side of the printer main body 1A has been described. However, the sheet processing apparatus 3 can be omitted. In this case, if the discharge tray (stacking tray) 3a is mounted downstream of the relay conveyance device 4 so as to be openable and closable, for example, the sheets S can be directly stacked on the paper discharge tray from the relay conveyance device 4.

  In the description so far, the case where the relay transport device 4 is provided with two transport paths (the paper discharge transport path R1 and the reverse transport path R2) has been described. However, the relay transport apparatus 4 has three or more transport paths. A road may be provided. In this case, for example, if a jam sensor and an electromagnet are provided for each conveyance path, the conveyance path where the jam has occurred can be selectively opened.

  Furthermore, in the above description, the case where the conveyance path is selectively opened by magnetic force has been described. However, for example, a conveyance path where a jam has occurred using an elastic force such as a spring as in a toggle mechanism is selectively used. It can also be opened.

1 is a diagram illustrating a configuration of a full-color laser beam printer that is an example of an image forming apparatus according to a first embodiment of the present invention. FIG. 1 is a first diagram illustrating a configuration of an image reading apparatus provided in the full-color laser beam printer. FIG. 3 is a second diagram illustrating the configuration of the image reading apparatus. FIG. 3 is a first diagram illustrating a configuration of a relay conveyance device provided in the full-color laser beam printer. The 2nd figure explaining the structure of the said relay conveyance apparatus. FIG. 10 is a first diagram illustrating a jam process when a sheet is jammed in a reverse conveyance path provided between the relay conveyance device and the image reading device. FIG. 9 is a second diagram illustrating a jam process when a sheet is jammed in a reverse conveyance path provided between the relay conveyance device and the image reading device. FIG. 6 is a first diagram illustrating a jam process when a sheet is jammed on a paper discharge conveyance path provided in the relay conveyance device. FIG. 6 is a second diagram illustrating a jam process when a sheet is jammed on a paper discharge conveyance path provided in the relay conveyance device. FIG. 10 is a first diagram illustrating a configuration of a relay conveyance device which is a sheet conveyance device provided in an image forming apparatus according to a second embodiment of the present invention. The 2nd figure explaining the structure of the said relay conveyance apparatus. FIG. 4 is a diagram illustrating a jam process when a sheet is jammed in a reverse conveyance path provided between the relay conveyance device and the image reading device. FIG. 4 is a diagram for explaining a jam process when a sheet is jammed on a paper discharge conveyance path provided in the relay conveyance device.

Explanation of symbols

1 Full color laser beam printer 1A Full color laser beam printer body (printer body)
1B Image forming section 1C Double-side reversing section 2 Image reading apparatus 2e Sheet guide 2f Guide sheet metal 3 Sheet processing apparatus 4 Relay conveyance apparatus 4a Upper guide 4c Magnet 4h Electromagnet 4i Jam sensor R1 Paper discharge conveyance path R2 Reverse conveyance path R3 Reconveyance path S Sheet

Claims (8)

An image forming apparatus main body comprising: an image forming unit that forms an image on a sheet; and a reconveying passage that conveys the sheet on which an image is formed on one side by the image forming unit to the image forming unit again; and the image forming apparatus A sheet conveying device located on the upper surface of the main body,
The sheet conveying device includes an openable and closable first sheet conveying path that conveys a sheet on which an image is formed by the image forming unit, and the first sheet conveying path above or below the first sheet conveying path. A second sheet conveyance path that is provided in parallel with the path and that can be opened and closed to convey the sheet by inverting the sheet in the re-conveyance path;
An opening means for selectively opening a sheet conveyance path in which a jammed sheet exists among the first sheet conveyance path and the second sheet conveyance path;
A first member that is openable and closable that constitutes an upper surface of an upper sheet conveyance path located above the first sheet conveyance path and the second sheet conveyance path;
A second member that constitutes a lower surface of the upper sheet conveying path and that can be opened and closed to constitute an upper surface of a lower sheet conveying path located below the first sheet conveying path and the second sheet conveying path; Have
The opening means opens the first member when a jammed sheet exists in the upper sheet conveyance path, and causes the magnetic force to be generated when the jammed sheet exists in the lower sheet conveyance path. an image forming apparatus comprising that you have configured to open integrally with said first member and said second member to adsorb the second member to the first member. The opening means is a magnet, and the magnitude of the magnetic force of the magnet is such that when the jammed sheet is present in the lower sheet conveyance path, the first member is in a state where the second member is attracted to the first member. When the jammed sheet is present in the upper sheet conveyance path, the second sheet is released from being attracted to the first member by the remaining sheet. The image forming apparatus according to claim 1 , wherein the image forming apparatus has a size as described above. The opening means is an electromagnet, and when there is a jammed sheet in the lower sheet conveyance path, the electromagnet is energized so that the first member and the second member move integrally in the opening direction, and the upper portion If jammed sheet in the sheet conveying path is present, the image forming apparatus according to claim 1, wherein the current is interrupted so that the first member is moved in the opening direction. Jam detection means is provided in at least one of the first sheet conveyance path and the second sheet conveyance path and detects a sheet conveyance path where a jammed sheet exists, and the jam detection is performed when the electromagnet is energized. 4. The image forming apparatus according to claim 3 , wherein control is performed based on a signal from the means. The image forming apparatus according to any one of claims 1 to 4, wherein the opening direction of the first member and the second member in the same direction. Said first member, said image forming apparatus is provided to be opened and closed on the upper surface of the main body, an image forming according to any one of claims 1 to 5, characterized in that an image reading apparatus for reading an image of the sheet apparatus. A sheet processing apparatus for processing a sheet on which an image is formed by the image forming unit is provided on a side of the image forming apparatus main body,
The image forming according to any one of the first to the sheet conveying path claims 1, characterized in that for conveying the sheet on which an image is formed by the image forming section to the sheet processing apparatus 6 apparatus. A stacking tray for stacking sheets on which images are formed by the image forming unit is provided on a side of the image forming apparatus main body, and the first sheet transport path is configured to stack sheets on which images are formed by the image forming unit. the image forming apparatus according to any one of claims 1 to, characterized in that for conveying the tray 7.

Images