JP2005099602A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus in which jamming caused in a sheet conveyance path toward a transfer part, an inverting conveyance path for inverting a sheet, or a sheet re-feeding conveyance path for re-feeding a sheet can easily be removed, maintainability of which is improved, and space of which is saved. <P>SOLUTION: The image forming apparatus comprises: a conveying both-sided unit 800 integrally constituted by including at least a conveying unit 801 for conveying a sheetlike medium conveyed from a paper feeding part 300 to the transfer part, and a both-sided unit 40 which is provided adjacent to the unit 801, inverts, back to front, the sheet-like medium with an image fixed to one side and then conveys the sheet-like medium to the transfer part again; and rail members 810 disposed on both sides of the unit 800. The unit 800 can be drawn from the main body 1 of the apparatus. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image forming apparatus using an electrophotographic process, and to an image forming apparatus including a duplex unit that enables duplex image formation on a sheet-like medium.

  2. Description of the Related Art Conventionally, there is an image forming apparatus provided with a duplex mode for forming an image on both sides of a sheet-like medium. In such an image forming apparatus, a double-sided unit that reverses the front and back of the sheet-like medium after an image is fixed on one side of the sheet-like medium is provided, and image formation on both sides is possible.

In the image forming apparatus, the following proposals have been made in order to cope with a jam in sheet-like medium conveyance in the duplex unit.
For example, an image forming unit that forms an image on a sheet, a discharge unit that discharges a sheet on which an image is formed by the image forming unit, and a sheet on which the image is formed by the image forming unit An intermediate tray, a conveyance path that guides the sheet to the intermediate tray, a switching means that selectively guides the sheet on which the image is formed by the image forming means to the discharge means or the conveyance path, and the intermediate tray. A feeding unit that feeds the held sheet; and a circulation path that guides the sheet fed by the feeding unit to the image forming unit, the discharge unit, the intermediate tray, the conveyance path, and the switching unit. The unit is configured as an integral unit, and the unit is perpendicular to the discharge direction of the discharge unit and is substantially horizontal and can be pulled out toward the front of the main body. An image forming apparatus having a support means for supporting is disclosed (see Patent Document 1.). According to this proposal, it is possible to easily handle a jam in the fixing unit, a sheet held on the intermediate tray by the feeding unit, and a jam that occurs while passing through the circulation path.

  Also, a registration unit that transports the sheet material in timing with the toner image on the photosensitive drum, a transfer unit that transfers the toner image on the photosensitive drum to the sheet material, and a sheet material that has finished transferring the toner image Conveying means to the fixing means, fixing means for fixing the image of the sheet material after image formation on the sheet surface, and discharging the sheet material fixed by the fixing means to the outside of the image forming apparatus main body. In the image forming apparatus having a paper discharge unit for paper, and a reversal switching unit for reversing the sheet material fixed by the fixing unit, the registration unit, the transfer unit, A component unit including a conveying unit, the fixing unit, a paper discharge unit, and a reversing unit is configured, and the component unit is pulled out of the image forming apparatus main body from the front side of the image forming apparatus main body. Image forming apparatus has been proposed which is adapted to (see Patent Document 2.). According to this proposal, it is possible to easily handle a jam that occurs in the fixing unit, the paper discharge unit, and the reversing unit.

Japanese Patent No. 3143522 JP-A-7-129057

  However, in the former proposal, it is necessary to deal with a jam that occurs in the conveyance path to the transfer unit by another means. In the latter proposal, the jam that occurs in the sheet reversal conveyance path is required. Response by another means is necessary.

  Therefore, in view of the above-described problems, the present invention can be used when a jam occurs in any of the sheet conveyance path toward the transfer unit, the reverse conveyance path for reversing the sheet, and the refeed conveyance path for refeeding the sheet. It is an object of the present invention to provide an image forming apparatus capable of facilitating jam processing, improving the maintainability of the apparatus, and saving the space of the apparatus.

In order to solve the above problems, the present invention is characterized by the following.
1. The present invention provides a conveyance unit that conveys a sheet-like medium conveyed from a paper feeding unit to a transfer unit, and a sheet-like medium that is provided adjacent to the conveyance unit and has an image fixed on one side thereof, and is reversed again. A double-sided transport unit integrally configured to include at least a duplex unit that transports toward the transfer unit; and rail members provided on both sides of the double-sided transport unit. An image forming apparatus configured to be drawable.

2. The duplex unit includes a reversing unit that reverses the front and back of a sheet-like medium having an image fixed on one side, and a refeed unit that transports the reversed sheet-like medium toward the transfer unit again. The reversing unit and the refeeding unit of the duplex unit can be opened at the drawer position.
3. The reversing unit and the re-feeding unit of the duplex unit are open to the lower surface side of the apparatus.
4). The reversing unit and the re-feeding unit of the duplex unit are open to the front side of the apparatus.

5). In the image forming apparatus, the duplex unit includes a reversing part opening lever and a refeeding part opening lever on the front side of the apparatus, and the reversing part opening lever and the refeeding part opening lever overlap with the transport unit. And a notch is provided in the transport unit.

  According to the present invention, since the transport unit and the duplex unit are integrated, it is possible to pull out only one pair of pull-out rails from the main body of the image forming apparatus, so that cost reduction and space saving can be achieved. Further, the duplex unit is composed of a refeed unit and a reversing unit, and can be opened at the pulling position of the transport duplex unit, thereby improving the maintainability of the apparatus and facilitating jam processing.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus according to the present invention. The configuration of a digital copying machine will be described as an example. The mechanism of this apparatus is generally composed of a copying machine main body 1, an automatic document feeder (ADF) 100, a paper discharge tray 200, and a paper feed unit (bank) 300.
FIG. 2 is a block diagram showing the control system of this digital copying machine. In the figure, a controller 501 performs overall system control, printer data reception management, and file management. The main controller 504 is a part responsible for various controls relating to image formation, and performs paper feeding, conveyance, fixing, duplex printing, process control, paper conveyance timing control, and the like. The operation unit controller 500 performs liquid crystal display and various LED display controls and various key input controls, and the image processing controller 502 performs image control, scanner reading control, and writing control. The ADF controller 503 controls the automatic document feeder 100, and the FAX controller 505 manages FAX transmission / reception and file management.

The automatic document feeder 100 feeds the documents stacked on the document feeder 101 one by one onto the contact glass 10 on the copier body 1 side, and discharges them onto the discharge tray 105 after reading the image. It is configured. The document on the document feeder 101 is aligned in the width direction by a side fence (not shown), separated from the lowermost document by the feed roller 102, and fed onto the contact glass 10 by the conveyor belt 103. Paper. The feeding unit 107 is provided with a document width detection sensor 108 and a document length detection sensor 109. The size of the document fed from the automatic document feeder 100 is detected by both the sensors. The original on the contact glass 10 is discharged onto the paper discharge tray 105 by the transport belt 103 and the paper discharge roller 104 after the reading is completed.
When reading a double-sided document, the document on the document feeder 101 is separated from the lowermost document by the feed roller 102 and fed, and passes through the contact glass 10 by the conveyor belt 103. It is reversed by the reversing claw 106, fed again onto the contact glass 10, and the back surface is read. Next, the original on the contact glass 10 is transported by the transport belt 103 after being read from the back surface, reversed by the reversing claw 106, fed again onto the contact glass 10, and the front surface is read. Then, the original after the front surface reading is discharged onto the discharge tray 105 by the conveyance belt 103 and the discharge roller 104.

FIG. 3 is a diagram showing the configuration of the automatic document feeder 100 installed on the upper part of the copying machine main body 1. As shown in FIG. 3, the automatic document feeder 100 is opened and closed around hinges 81 and 82, and a claw 83 is provided on the upper surface of the copier body 1 in the vicinity of the hinge 81, A hole 84 is provided in the lower surface of the automatic document feeder 100 at a position where the claw 83 faces when the conveying device 100 is closed. When the automatic document feeder 100 is closed, the claw 83 is inserted into the hole 84. ing. Inside the automatic document feeder 100 adjacent to the hole 84, a lift-up detection sensor 85 and a document detection timing sensor 86 for detecting the presence or absence of the claw 83 inserted through the hole 84 are provided.
The lift-up detection sensor 85 detects the claw 83 when the automatic document feeder 100 is completely closed (lifted down) and is turned on, and when the automatic document feeder 100 is opened (lifted up). Will be off. The completely closed state refers to a state in which a part of the lower surface side of the automatic document feeder 100 is in contact with the upper surface of the copying machine main body 1.
On the other hand, the document detection timing sensor 86 is provided to control the timing of detecting the size of the document on the contact glass 10 based on the detection result of the document size detection sensor described later. When the opening angle is within a predetermined angle, the claw 85 is detected and turned on. This predetermined angle is a slight angle, and when the operator manually opens the automatic document feeder 100, both the lift-up detection sensor 85 and the document detection timing sensor 86 are turned off. 87 and 88 are end face scales.

  FIG. 4 is a diagram showing the configuration of the contact glass 10 of the copying machine main body 1 and its periphery. As shown in FIG. 4, document size detection sensors 91 to 93 are provided below the contact glass 10. FIG. 5 is a diagram showing a detailed configuration of the document size detection sensor. As shown in FIG. 5, each of the document size detection sensors 91 to 93 irradiates the light emitted from one light emitting diode 91a by dispersing it into three beams and irradiates the reflected light to three light beams inside the optical system. It is a reflective sensor that receives light by the light receiving element 91b, and detects the presence or absence of a document by receiving only reflected light from the document surface through the contact glass 10 from the inside of the optical system. The document size detection sensors 91 to 93 are always in operation, and each light receiving element is turned on when a document on the contact glass 10 is detected, and is turned off when a document is not detected. The document size detection sensors 91 to 93 are arranged according to the sizes of a plurality of types of documents placed at predetermined positions on the contact glass 10. From this, it is determined whether or not there is a document on the contact glass 10, and the size of the document on the contact glass 10 is detected.

The copier body 1 includes a scanner for reading a document, an image processing unit, a plotter, and the like. As shown in FIG. 1, the scanner has a contact glass 10 for placing a document and an optical scanning system. The optical scanning system is an exposure lamp 11, a first mirror 12, a second mirror 13, and a third mirror 14. , Lens 15, full color CCD 16 and the like.
The exposure lamp 11 and the first mirror 12 are mounted on the first carriage, and the first carriage moves in the sub-scanning direction at a constant speed by a stepping motor when reading a document. The second mirror 13 and the third mirror 14 are mounted on the second carriage, and the second carriage moves at a speed half that of the first carriage by a stepping motor when reading a document. The original on the contact glass 10 is optically scanned by the movement of the first and second carriages, and is imaged on the light receiving surface of the CCD 16 by the lens 15 and subjected to photoelectric conversion.
The image signal separated into red (R), green (G), and blue (B) by the full color CCD 16 is A / D converted by an image processing circuit and then subjected to various image processing by an image processing unit. Then, at the time of copying, the data is copied onto the recording paper by the writing unit.

FIG. 6 is a block diagram showing an image processing circuit of this digital copying machine. The document 600 on the contact glass 10 is illuminated by the exposure lamp 11 and the reflected light is read by the color CCD 16. Next, the analog image signal separated into R, G, and B by the color CCD 16 is amplified by the signal processing circuit 601 and corrected for light amount, converted into a digital image signal by the AD converter 602, and shading correction by the shading correction circuit 603. And sent to the image processing unit 604.
The image processing unit 604 performs image quality processing such as MTF correction, γ correction, black image generation, color image generation, binary processing, and multi-value processing, and outputs black data and color data to the selector 605. In the selector 605, the destination of the image signal is switched to the scaling unit 606 or the image memory controller 608. The image signal that has passed through the scaling unit 606 is enlarged / reduced in accordance with the scaling factor and sent to the writing unit 607. The image memory controller 608 and the selector 605 are configured to be able to input and output image signals in both directions. In addition, a CPU 609 for setting the image memory controller 608 and the like and controlling the reading unit and the writing unit, and a ROM 610 and a RAM 611 for storing the program and data are provided. Further, the CPU 609 can write and read data in the image memory 612 via the memory controller 608.
The image sent to the image memory controller 608 as a document image is sent to the image memory 612 after the image data is compressed by an image compression device in the image memory controller 608. By performing image compression, a limited image memory can be used effectively. In addition, since a large amount of original image data can be stored at a time, the stored original image data can be output in page order. In this case, when the image is output, the data in the image memory 612 is output while being sequentially expanded by the expansion device in the memory controller 608.
On the other hand, at the time of FAX transmission, the black data is transferred to the FAX image memory 613 by the selector 605. At the time of FAX reception, the received data is demodulated and expanded from the line, and is expanded in the FAX image memory 613 and then sent to the writing unit 607 by the selector 605.
Further, when the printer data is received, the data is expanded in the printer image memory 614 and then sent to the writing unit 607 by the selector 605.

As shown in FIG. 1, the writing unit includes a laser output unit 20, an fθ lens 21, and a mirror 22. The laser output unit 20 includes a laser diode (LD) that is a laser light source, a polygon mirror and a polygon motor (not shown). Have The laser output unit 20 emits a black signal laser beam modulated according to the image read by the scanner during copying, and forms a latent image on the photosensitive member 30.
Around the photosensitive member 30, a black developing device 32, an LED writing unit 31 for writing a red signal image, a red second developing device 33, a transfer device and a separator (not shown) are arranged. The upper toner image is recorded on the recording paper.

The recording paper is selectively fed from one of the first tray 50, the second tray 51, the third tray 310, the fourth tray 320, and the fifth tray 330 in the paper feeding unit 300 in the copying machine main body 1, respectively. In addition, the sheet is fed by a roller pair of separation rollers. FIG. 7 is a diagram illustrating the configuration of the paper feed tray. The size and the setting direction of the recording paper set in each tray are detected by the combination of ON / OFF of a plurality of push switches 401 for the position of the size lever 400 in the tray.
The recording paper fed from the duplex unit 40, the first tray 50, and the second tray 51 is conveyed upward by the vertical conveyance unit 60, and is fed from the third tray 310, the fourth tray 320, and the fifth tray 330. The recorded recording paper is transported upward by the bank vertical transport unit 340 and the vertical transport unit 60.

  The recording paper abuts against the registration roller 53 after a predetermined time after the leading edge is detected by the registration sensor 52, temporarily stops, and is conveyed by the registration roller 53 in synchronization with the sub-scanning effective period signal (FGATE). The toner image on the photoreceptor 30 is transferred. Next, the recording paper is separated from the photoreceptor 30 and then conveyed by the conveying device 54, and the toner image is fixed by the fixing device 55.

FIG. 8 shows an internal configuration of the fixing device 55. As illustrated, the fixing device 55 includes a fixing roller 700 and a pressure roller 701 that is in pressure contact with the fixing roller 700. The surface of the fixing roller 700 is coated with a heat-resistant release layer such as PFA or PTFE, and a heat source 702 is provided inside. As the heat source 702, a halogen heater, an infrared heater (nichrome wire), or the like is used. A fixing temperature sensor 703 as temperature detecting means is provided on the peripheral surface of the fixing roller 700, and a pressure temperature sensor 704 as temperature detecting means is provided on the peripheral surface of the pressure roller 701. This fixing temperature sensor. 703. Based on the temperature detection signal from the pressure temperature sensor 704, the heat source 702 is controlled so that the temperature of the fixing roller 700 and the pressure roller 701 becomes a certain temperature, and the amount of heat supplied to the recording paper is controlled. Therefore, the pressure mechanism is controlled so that the nip width between the fixing roller 700 and the pressure roller 701 can be changed. The fixing roller 700 is rotated by a driving mechanism (not shown), and performs fixing processing by applying heat and pressure to the recording paper while conveying the recording paper in cooperation with the pressure roller 701.
The pressure roller 701 has a surface made of a heat-resistant rubber layer such as silicon rubber. The pressure roller 701 is pivotally supported at both ends of the shaft so as to be rotatable, and is always urged in a direction away from the fixing roller 700 by an urging means (not shown). On the other hand, the pressure roller 701 is lifted from below the shaft by a pressure mechanism and pressed against the lower portion of the fixing roller 700.

  In the pressurizing mechanism, the stepping motor 710 rotates forward (direction A), and the gear 713 is driven from the coaxial gear 711 through the idler gear 712. The shaft of the gear 713 is a feed screw 714 that pulls the anchor 715 in the horizontal direction (C direction). A spring 716 is hung on the anchor 715, and one is hung on the link 717. As the anchor 715 moves horizontally, the link 717 rotates around the fulcrum 718. A lever 719 is fitted to one end of the link 717 and rotates around a fulcrum 720 to push up the pressure roller 701 and apply pressure. Further, when the stepping motor 710 reversely rotates (B direction), the anchor 715 is pushed back in the horizontal direction (D direction), the lever 719 rotates about the fulcrum 720, and the pressure roller 701 is pulled down to release pressure. At this time, the anchor 715 is provided with a home position detection 721, and the pressure instructed can be applied to the pressure roller 701 by adjusting the amount of movement of the anchor 715. This mechanism is provided at both ends of the pressure roller 701.

In the image forming apparatus configured as described above, as soon as the power is turned on, the heat source 702 is activated to start heating the fixing roller 700, and the surface of the fixing roller 700 and the pressure roller 701 is detected by the temperature detection unit. Start temperature detection. When the surface temperature of the fixing roller 700 and the pressure roller 701 reaches a temperature at which an unfixed image on the recording paper can be fixed, copying can be started and a message to that effect is displayed on an operation panel (not shown).
Note that the fixing device provided in the present embodiment is pressurized during printing, and other than printing and during jamming, the applied pressure is released by the pressure motor 710 shown in FIG. The rollers 701 are separated to facilitate jam processing. Further, the transfer belt is configured to be separated from the transfer belt 54 and the photosensitive drum 30 by a lifting motor except for printing. The transfer belt 54 is positioned so as to be separated from the photosensitive drum 30.

  The recording sheet after fixing is discharged to the discharge tray 200 by the switching claw 57 and the discharge roller 56 during single-sided printing and after double-sided printing. On the other hand, the recording paper after surface printing during double-sided printing is guided to the reverse conveyance path 41 by the switching claw 57, and the recording paper is switched back and reversed by the reverse conveyance roller, and is reversed to the double-sided refeed conveyance path 42. Be transported. The recording paper conveyed to the double-sided conveyance path is sent to the vertical conveyance unit 60 to form an image on the back surface.

The image forming apparatus of the present invention includes at least a transport unit that transports recording paper to a transfer unit and a duplex unit adjacent to the transport unit, and is configured as a transport duplex unit. FIG. 9 is a cross-sectional view of the transport duplex unit. In the present embodiment, the transport duplex unit 800 includes the transport unit 801 including the registration roller 53, the transfer belt 54, the fixing device 55, the switching claw 57, and the paper discharge roller 56, and the duplex unit 40. .
The double-sided conveyance unit 800 is positioned on the main body side plate (not shown) in FIGS. 9A and 9B. The fixing device 55 mounted on the transport unit 801 is positioned in the direction perpendicular to the transport direction with respect to the transport unit 801 at positions C and D in the figure, but not positioned in the transport direction. Thus, when the transport unit 801 is mounted on the main body, it is positioned on the main body side plate by the positioning pins E and F.

10 to 17 are diagrams illustrating examples of the conveyance duplex unit 800 mounted on the image forming apparatus. In the transport duplex unit 800 of the present embodiment, a structure that supports each unit, a transport guide that guides recording paper between the units, and the like are configured by resin integral molding. Various conveyance rollers, a unit including a transfer belt 54, a unit including a fixing device 55, a duplex unit 40, and the like are mounted, and are integrally attached to the left and right from the copying machine main body 1 at right angles to the conveyance direction. It can be pulled out.
FIG. 10 shows a state in which the conveyance duplex unit 800 is pulled out from the copying machine main body 1, and FIG. 11 shows the same state seen from different angles. FIG. 12 shows a state in which the transport duplex unit 800 is housed in the copying machine main body 1, and a pair of drawer rails are provided on the left and right of the transport duplex unit 800.
As shown in FIG. 10, the transport unit 801 can draw most of the portion from the copying machine main body 1 by the slide rail 810, so that the removal property at the time of jamming and the maintenance property such as cleaning are improved. In the present invention, as shown in FIG. 11, the duplex unit 40 is integrally provided on the lower surface of the transport unit 801, and the transport duplex unit 800 can be pulled out from the copying machine main body 1. For this reason, a pair of rails necessary for pulling out the transport unit 801 and the duplex unit 40 separately as in the prior art can be realized by integrating the transport unit 801 and the duplex unit 40. Down and space saving are possible.

  FIG. 13 shows a state where the transport duplex unit 800 is pulled out from the copying machine main body 1 and the duplex unit 40 is opened. The duplex unit 40 includes a reversing unit 410 including a reversing conveyance path 41 and a refeeding unit 420 including a refeeding conveyance path 42. As illustrated in FIG. Each is configured to be openable. 11 shows a state in which the transport duplex unit 800 is pulled out from the copier body 1 and only the reversing unit 410 is opened. FIG. 14 shows the transport duplex unit 800 pulled out from the copier body 1 and only the refeed unit 420. It is in an open state. As described above, the reversing unit 410 and the re-feeding unit 420 of the duplex unit 40 can be opened simultaneously or independently, thereby improving maintenance such as cleaning and facilitating processing when a jam occurs. become.

FIG. 15 is a diagram in which jamming processing is performed with the duplex unit 40 opened with the transport duplex unit 800 pulled out. As can be seen with reference to FIGS. 11, 13, and 14, the reversing unit 410 and the refeed unit 420 of the duplex unit 40 can be opened to the lower surface side of the image forming apparatus. As a result, during jam processing, the jammed paper comes to the near side or falls naturally only by opening the reversing unit 410 and the refeeding unit 420, so that the jammed paper can be removed very easily.
In particular, by having a fulcrum on the back side of the image forming apparatus and opening the reversing unit 410 and the re-feeding unit 420 to the front side, the jam paper has good visibility and can be operated even when the jam paper is taken out. Good.
When the installation space of the machine is small and there is not much gap between the left and right sides of the machine, if the internal unit is opened in the lateral direction of the device, the visibility and operability of the jam paper will deteriorate. By opening the internal unit to the front side of the apparatus as in the present invention, it is possible to obtain good operability of the apparatus even when such a space is limited.

FIG. 16 is a view of the duplex unit 40 as viewed from the front in a state where the duplex transport unit 800 is housed in the copying machine main body 1. A reversing part opening lever 410a and a refeeding part opening lever 420a are provided in front of the duplex unit 40. Further, the transport unit 801 is provided with a notch 811 in a portion overlapping with these levers, whereby the visibility of each lever is improved and the operability is also improved.
FIG. 17 shows a state in which the conveying duplex unit 800 is pulled out from the copying machine main body 1 and the duplex unit 40 is opened. As can be seen from the figure, the notch 811 provided in the transport unit 801 improves the visibility inside the reversing unit 410, and even when a jam occurs, the jammed paper can be easily confirmed, and can be removed. Sufficient space can be secured.

1 is a diagram showing a schematic configuration of a digital copying machine as an image forming apparatus according to the present invention. 2 is a block diagram showing a control system of a digital copying machine. FIG. FIG. 2 is a diagram showing a configuration of an automatic document feeder installed at the upper part of a copying machine main body. FIG. 2 is a diagram illustrating a configuration of a contact glass of a copying machine main body and its periphery. It is a figure which shows the detailed structure of a document size detection sensor. 1 is a block diagram illustrating an image processing circuit of a digital copying machine. It is a figure which shows the structure of a paper feed tray. FIG. 2 is a diagram illustrating an internal configuration of a fixing device. It is sectional drawing of a conveyance duplex unit. FIG. 6 is a diagram illustrating a state where the transport duplex unit is pulled out from the copying machine main body. FIG. 6 is a diagram illustrating a state where the transport duplex unit is pulled out from the copying machine main body. FIG. 3 is a diagram illustrating a state where a transport duplex unit is stored in a copying machine main body. FIG. 6 is a diagram illustrating a state where the transport duplex unit is pulled out from the copying machine main body and the duplex unit is opened. FIG. 4 is a diagram illustrating a state in which the transport duplex unit is pulled out from the copying machine main body and only the refeed unit is opened. FIG. 6 is a diagram illustrating a jam process when the duplex unit is opened with the transport duplex unit pulled out. FIG. 5 is a diagram of the duplex unit as seen from the front in a state where the duplex unit is accommodated in the copying machine main body. FIG. 6 is a diagram illustrating a state where the transport duplex unit is pulled out from the copying machine main body and the duplex unit is opened.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Copier main body 40 Duplex unit 410 Inversion part 410a Inversion part release lever 41 Inversion conveyance path 420 Refeed part 420a Refeed part release lever 42 Refeed conveyance path 53 Registration roller 54 Transfer belt 55 Fixing device 56 Discharge roller 57 Switching claw 100 Automatic document feeder (ADF)
200 Paper discharge tray 300 Paper feed unit 800 Transport duplex unit 801 Transport unit 810 Slide rail 811 Notch

Claims (5)

  A conveyance unit that conveys the sheet-like medium conveyed from the paper feeding unit to the transfer unit, and a sheet-like medium that is provided adjacent to the conveyance unit and has an image fixed on one side thereof are reversed, and again toward the transfer unit. A double-sided conveyance unit that includes at least a double-sided unit that conveys and a rail member provided on both sides of the double-sided conveyance unit, and the double-sided conveyance unit can be pulled out from the apparatus main body. An image forming apparatus.   The image forming apparatus according to claim 1, wherein the duplex unit includes a reversing unit that reverses the front and back of the sheet-like medium having an image fixed on one side thereof, and a re-feeding unit that transports the reversed sheet-like medium toward the transfer unit. An image forming apparatus comprising: a sheet feeding unit, wherein a reversing unit and a sheet refeeding unit of the duplex unit can be opened at a drawing position of the transport duplex unit.   The image forming apparatus according to claim 2, wherein the reversing unit and the refeed unit are opened to a lower surface side of the apparatus.   The image forming apparatus according to claim 2, wherein the reversing unit and the refeed unit are opened to the front side of the apparatus.   5. The image forming apparatus according to claim 2, wherein the duplex unit includes a reversing part opening lever and a refeeding part opening lever on a front side of the apparatus, and the reversing part opening lever and the refeeding unit. An image forming apparatus, wherein a notch is provided in the transport unit at a position where a part opening lever overlaps with the transport unit.

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