JP4894352B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus such as a copying machine or a printer that employs an electrophotographic system, and more particularly to an image forming apparatus provided with an optional post-processing device that performs post-processing on a recording medium discharged from a printer unit.

  2. Description of the Related Art Conventionally, in an image forming apparatus such as a copying machine or a printer that employs an electrophotographic system, an optional post-processing device may be added on the downstream side in the transport direction of a printer unit that forms an image on a recording medium.

  For example, an image forming apparatus is disclosed in which a scanner unit for reading an image is disposed above the printer unit, and an optional post-processing device is added in a space between the scanner unit and the printer unit (for example, Patent Document 1). reference).

  In this configuration, a small post-processing device such as a stapler or an offset catch tray can be mounted in a narrow space between the scanner unit and the printer unit, but a large post-processing device such as a duplex printing unit or a plurality of bins can be installed. It is not possible to implement a sorter that is provided.

  As another configuration, a relay conveyance path is provided in the space between the scanner unit and the printer unit, and a large post-processing device is provided on the side of the printer unit located downstream of the relay conveyance path in the conveyance direction. An image forming apparatus is disclosed (for example, see Patent Document 2).

However, the configuration described in Patent Document 2 should be adopted in a printer unit that discharges paper from the back side to the near side (back side to front side) when the user stands in front of the image forming apparatus. In this case, a post-processing device is provided in front of the printer unit, and the operability of setting a document on the scanner unit is significantly impaired. The loss of operability in this way is not limited to the configuration as in Patent Document 2, but when the post-processing device is attached to the printer unit in which the recording medium is discharged in the front-rear direction of the printer unit, It is often considered that operability is impaired by other factors.
US Pat. No. 6,898,395 JP-A-11-157725

  The present invention has been made in view of the above problems, and an image forming apparatus capable of reducing the loss of operability even when a post-processing device is attached to a printer unit in which a recording medium is discharged in the front-rear direction of the printer unit. The purpose is to provide.

In order to solve the above-described problems, an image forming apparatus according to the first aspect of the present invention includes a scanner unit that reads an image, prints an image read by the scanner unit on a recording medium, and scan direction in the scanner unit A printer unit that discharges a recording medium in a direction orthogonal to the printer unit, and supports the scanner unit on a top of the printer unit with a support, forming a space between the printer unit and the scanner unit, An image forming apparatus that discharges a recording medium from the printer unit to a space, and a housing portion of a conveyance path of a post-processing device that is detachably provided in the printer unit is inserted behind the image forming apparatus main body in the space. only set an opening that is, the width of the opening, the post-processing device conveying path is set for greater than the width of the housing portion of the post-processing device the upper side of the rear as the pivot center of the lower The scanner section is pivoted upward on the front side with the rear section as the center of rotation, and the height of the opening is attached to and detached from the printer section by rotating the post-processing device. When the height of the casing of the transport path of the post-processing apparatus does not hit the scanner section, and when the scanner section is rotated with respect to the printer section, the scanner section is transported of the post-processing apparatus It is characterized in that it is set to a height that does not hit the housing part of .

According to the first aspect of the present invention, the opening portion through which the housing portion of the conveyance path of the post-processing device is inserted is provided behind the main body of the image forming apparatus in the space between the printer unit and the scanner unit. In the opening, the casing of the conveyance path of the post-processing apparatus is installed. As a result, the recording medium discharged from the printer unit is conveyed to the conveyance path of the post-processing device disposed in the opening at the rear of the image forming apparatus main body in the space, and the post-processing device performs post-processing on the recording medium. The Therefore, even in a printer unit that discharges a recording medium in a direction orthogonal to the scanning direction in the scanner unit , the support member does not get in the way, and the post-processing device is installed in the opening at the rear of the image forming apparatus main body in the space. The housing portion of the transport path can be arranged. Thus, it is possible to reduce the loss of operability such as setting a document on the scanner unit when the post-processing device is provided.

In addition, since the post-processing apparatus is detachably provided in the printer unit, the user can increase the conveyance path of the post-processing apparatus as necessary. For this reason, useless cost burden is not imposed on the user who does not require the post-processing device.
Furthermore, the width of the opening is set to be larger than the width of the casing of the conveyance path of the post-processing apparatus, and the casing of the conveyance path can be inserted into the opening. The height of the opening is set so that the housing portion of the conveyance path of the post-processing device does not hit the scanner unit when the post-processing device is rotated and detached from the printer unit. Good workability when attaching and detaching the device. Alternatively, the height of the opening is set to such a height that the scanner unit does not hit the casing of the conveyance path of the post-processing device when the scanner unit is rotated with respect to the printer unit. Workability when moving and attaching / detaching the post-processing device is good.

Recording of the invention according to claim 2, in the image forming apparatus according to claim 1, wherein the printer unit is to discharge the recording medium to the front side from the rear side of the space, the post-processing apparatus, which has been discharged A switchback transport path for transporting the medium by switching back is provided.

According to the second aspect of the present invention, the printer unit discharges the recording medium from the rear side to the front side of the space, and switches the discharged recording medium back on the switchback conveyance path of the post-processing device. Since it is conveyed, the front and back of the recording medium will not be reversed. Since the post-processing apparatus includes a switchback conveyance path, even when the post-processing apparatus is arranged in the printer unit that discharges the recording medium from the rear side to the front side, the original can be set on the scanner unit from the front side of the printer unit. It is possible to reduce the loss of operability such as.

The invention according to claim 3, in the image forming apparatus according to claim 1, wherein the printer unit is to discharge the recording medium to the rear side from the front side of the space and the printer unit, the post Apart from the conveyance path to send the recording medium to the conveying path of the processing apparatus is characterized in that the recording medium discharge portion for discharging the recording medium to the space is provided.

According to the invention described in claim 3 , since the printer unit is provided with a recording medium discharge unit that discharges the recording medium to the space separately from the conveying path for sending the recording medium to the conveying path of the post-processing device . It can be selected whether the recording medium discharged from the printer unit is conveyed to the recording medium discharge unit or the conveyance path of the post-processing apparatus. As a result, even if the post-processing device is arranged in the printer unit that discharges the recording medium from the front side to the rear side, it is possible to reduce the impairing of operability such as document setting from the front side of the printer unit to the scanner unit. Since the recording medium not subjected to post-processing is discharged to the recording medium discharge section, it is easy to take out the recording medium.

According to a fourth aspect of the present invention, in the image forming apparatus according to any one of the first to third aspects, the transport path of the post-processing apparatus is a return transport path for duplex printing. It is said.

According to the fourth aspect of the invention, since the conveyance path of the post-processing device is a return conveyance path for duplex printing, the recording medium ejected from the printer unit is conveyed to the return conveyance path for duplex printing. By providing a return conveyance path for double-sided printing in the post-processing device, it is not necessary to provide a switchback mechanism for double-sided printing in the printer unit, and there is no unnecessary cost burden on the user.

According to a fifth aspect of the present invention, in the image forming apparatus according to any one of the first to fourth aspects, the opening portion guides the attachment / detachment of the housing portion of the conveyance path of the post-processing device. A guide is provided.

According to the fifth aspect of the present invention, when the housing portion of the transport path of the post-processing apparatus is attached / detached, the guide is provided by the guide provided in the opening, so that the transport path can be easily attached / detached.

  According to the present invention, since it is configured as described above, even if the post-processing device is attached to the printer unit in which the recording medium is discharged in the front-rear direction of the printer unit, it is possible to reduce the loss of operability.

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

  FIG. 1 shows an image forming apparatus 10 according to the first embodiment of the present invention. In each figure, for each color of yellow (Y), magenta (M), cyan (C), and black (K), “Y”, “M”, “ Some of them are marked with the letters “C” and “K”.

  The image forming apparatus 10 includes four image carriers (photosensitive members) 20 arranged in the vertical direction inside a housing 12 constituting the printer unit 100, and yellow (Y) and magenta. Developing units 16Y, 16M, 16C, and 16K that respectively form (M), cyan (C), and black (K) toner images, and a transport unit 18 that transports the recording paper P are provided. Here, when it is necessary to distinguish yellow (Y), magenta (M), cyan (C), and black (K), “Y”, “M”, “C”, “K” are added after the sign. A description will be given, and a description thereof will be omitted if it is not necessary to distinguish.

  The developing unit 16 is configured to irradiate the image carrier 20 with image light based on the image data and uniformly charge the surface of the roll-shaped image carrier 20. The optical box 24 for forming the toner image, the developing roller 26 for selectively transferring the toner to the latent image for visualization, and the image carrier 20 after the toner image has been transferred are slidably contacted and remain on the image carrier 20. And a cleaning member 28 for cleaning the toner.

  The image carrier 20 has a photosensitive layer on the surface (peripheral surface), and after the surface (peripheral surface) is uniformly charged by the charging roller 22, laser light (image) that is irradiated from the optical box 24. The surface (peripheral surface) is exposed to light, and an electrostatic latent image is formed by attenuating the potential of the exposed portion. The charging roller 22 is in contact with the image carrier 20, and a voltage is applied between them to generate a discharge in a minute gap near the contact portion, thereby causing the surface (circumferential surface) of the image carrier 20 to be discharged. Charges almost uniformly.

  The optical box 24 scans the surface (circumferential surface) of the image carrier 20 with the blinking laser beam, and forms an electrostatic latent image based on the image data on the surface (circumferential surface) of the image carrier 20. In addition, as the optical box 24, what arrange | positions light emitting elements, such as LED, and blinks these based on image data etc. can be considered.

  The developing roller 26 is disposed so as to face the image carrier 20 in the vicinity thereof, and a developing bias voltage is applied between the developing roller 26 and the image carrier 20. As a result, a developing bias electric field is formed between the developing roller 26 and the image carrier 20, and the charged toner is transferred to the exposed portion on the image carrier 20 to form a visible image.

  On the other hand, the transport unit 18 includes a transport belt 34 stretched between a drive roller 30 and a driven roller 32, and is located at a predetermined position between the drive roller 30 and the driven roller 32 on the inner surface side of the transport belt 34. A plurality of transfer rollers 36 (four corresponding to each color to be described later) are arranged at a predetermined interval. The conveyance belt 34 is rotated by the rotation of the driving roller 30 and the driven roller 32, and the recording paper P can be conveyed by electrostatic adsorption between the image carrier 20 and the transfer roller 36.

  The transfer roller 36 faces the image carrier 20 with the conveyance belt 34 interposed therebetween, and forms a transfer electric field between the transfer roller 36 and the recording paper P that is sucked and conveyed by the conveyance belt 34 and passes therethrough. Further, a toner image (unfixed image) on the surface of the image carrier 20 is transferred.

  Here, the developing unit 16 is arranged in the vertical direction in order of yellow (Y), magenta (M), cyan (C), and black (K), for example, from the bottom so that full-color printing is possible. A fixing device 38 is disposed downstream of the developing units 16Y to 16K in the conveyance direction of the recording paper P (upper part of the housing 12).

  The fixing device 38 includes a heating roller 40 and a pressure roller 42 that face each other and are pressed against each other with a predetermined pressure (nip), and the recording paper P is formed by the heating roller 40 and the pressure roller 42. The toner image is fixed to the recording paper P by heating and pressurizing the unfixed toner image transferred thereon.

  Note that the recording paper P on which the toner image is fixed by being heated and pressed by the fixing device 38 (the heating roller 40 and the pressure roller 42) is conveyed through a discharge path 50 provided with a pair of conveyance rollers 52 and a discharge roller 54. And discharged onto the discharge tray 44. After the transfer of the toner image to the recording paper P, the surface (circumferential surface) of the image carrier 20 is cleaned by the cleaning member 28 to prepare for the next image forming process.

  In addition, a detachable paper feed cassette 46 is provided at a lower portion in the housing 12. In the vicinity of the front end portion of the paper feed cassette 46, a paper feed roller pair 48 for feeding the recording paper P one by one from the paper feed cassette 46 is provided, and the recording paper P sent from the paper feed roller pair 48 is The registration roller pair 49 sends the toner to the suction conveyance surface of the conveyance belt 34 at a predetermined timing and conveys the toner image of each color to the transfer position.

  The image forming apparatus 10 is additionally provided with a duplex unit 112 for duplex printing as a post-processing device as an option. The duplex unit 112 is provided with a conveyance path 56 for duplex printing in which the recording paper P is conveyed by reversing the discharge roll 54, and a plurality of conveyance roller pairs 58 are arranged along the conveyance path 56. Yes. The conveyance path 56 is connected to the conveyance path of the recording paper P on the upstream side of the registration roller pair 49.

  In the case of single-sided printing, the recording paper P on which the toner image is fixed is transported through a discharge path 50 by a pair of transport rollers 52 and a discharge roll 54 and is discharged as it is onto a discharge tray 44 provided at the top of the housing 12. Is done. In the case of double-sided printing, the recording paper P on which the toner image is fixed on the first surface (front surface) by the fixing device 38 is not directly discharged onto the discharge tray 44 by the discharge roll 54, but is recorded by the discharge roll 54. In a state where the rear end portion of P is held, the discharge roll 54 is reversed, and the conveyance path of the recording paper P is switched from the discharge path 50 to the conveyance path 56. That is, the recording paper P conveyed to the discharge path 50 is switched back and conveyed to the conveyance path 56. Then, the recording paper P is conveyed to the upstream side of the registration roller pair 49 again with the front and back sides of the recording paper P reversed by the conveying roller pair 58 disposed in the conveying path 56. Thereafter, the recording paper P is transported to the transport belt 34, the toner image is transferred to the second surface (back surface) of the recording paper P, and the toner image on the second surface (back surface) of the recording paper P is fixed by the fixing device 38. To be discharged onto the discharge tray 44.

As shown in FIG. 1, in the image forming apparatus 10, the optical box 24 side of the casing 12 constituting the printer unit 100 is the front side, and the conveyance unit 18 side of the casing 12 is the rear side. Standing on the front side, various operations are performed on the image forming apparatus 10.
As shown in FIGS. 2 and 5, in the image forming apparatus 10, supports 102 are erected at both ends on the rear side (conveying unit 18 side) of the casing 12 constituting the printer unit 100. On the upper part of the two supports 102, a scanner unit 104 that reads an image of a document is supported so as to form a space S with the printer unit 100. The scanner unit 104 scans a document with light and reads an image with the reflected light. Information on the read image is sent to the optical box 24 and irradiates the image carrier 20 with laser light. It is like that. The scanner unit 104 is set to scan in a direction orthogonal to the front-rear direction of the printer unit 100 (left-right direction with respect to the housing 12). Accordingly, the printer unit 100 is configured to discharge the recording paper P in a direction orthogonal to the scanning direction of the scanner unit 104, that is, to discharge the recording paper P in the front-rear direction of the printer unit 100.

  As shown in FIG. 3, the scanner unit 104 is supported so as to be rotatable about a support shaft 106 </ b> A provided in the holding unit 106 at the top of the support 102. In addition, a protrusion 108 is formed in a direction substantially perpendicular to the bottom of the scanner unit 104, and the rotation of the scanner unit 104 is restricted by the protrusion 108 abutting against the side of the support 102.

  As shown in FIG. 5, two supports 102, the scanner unit 104, and the printer unit are located behind the recording paper discharge direction in the space S between the printer unit 100 and the scanner unit 104 (rear of the housing 12). An opening 110 is formed at a position surrounded by 100. A housing 112A of a duplex unit 112, which is an optional post-processing device, is detachably attached to the opening 110, and the width of the opening 110 is set larger than the width of the housing 112A. . In the duplex unit 112, the rear side of the housing part 112 </ b> A inserted into the opening 110 is bent at a substantially right angle to form a housing part 112 </ b> B, and the housing part 112 </ b> B is attached to the rear of the printer unit 100.

  As shown in FIG. 1, the printer unit 100 is configured to discharge the recording paper P from the rear side to the front side, and the recording paper P conveyed through the discharge path 50 of the printer unit 100 is switched back. The paper is conveyed to the housing 112B on the rear side of the printer unit 100 through the conveyance path 56 of the housing 112A attached to the opening 110.

  As shown in FIGS. 3 and 4, the lower part of the double-sided unit 112 is connected to the printer unit 100 by a connecting member 116, and the upper part of the double-sided unit 112 can rotate in the front-rear direction with respect to the printer unit 100. It has become. Further, one side of the band-shaped metal fitting 118 is connected to the front middle portion of the double-sided unit 112, and the other side of the band-shaped metal fitting 118 is connected to the rear side of the printer unit 100, so that the double-sided unit 112 does not fall down. Has been. In addition, a hook 120 is provided in an upper part on the front side of the duplex unit 112, and the duplex unit 112 is attached to the printer unit 100 by the hook 120 being engaged with the engagement unit 100 </ b> A of the printer unit 100. The

  When removing the duplex unit 112 from the printer unit 100, the scanner unit 104 is rotated upward (in the direction of arrow A) with respect to the printer unit 100 as shown in FIG. Then, as shown in FIG. 4, the upper part of the duplex unit 112 is rotated in the arrow B direction (front-rear direction) with respect to the printer unit 100, and the coupling member 116 and the like are removed to remove the duplex unit 112 from the printer unit 100. . Further, when the duplex unit 112 is attached to the printer unit 100, the series of operations is reversed. At this time, the height of the opening 110 is set to a height at which the housing 112 </ b> A does not hit the scanner unit 104 when the duplex unit 112 is rotated to be attached to and detached from the printer unit 100. Further, the height of the opening 110 is such that when the scanner unit 104 hits the housing unit 112A of the duplex unit 112 when the scanner unit 104 is rotated in the direction of arrow A with respect to the printer unit 100 about the support shaft 106A. Not set to a height. For this reason, workability when attaching / detaching the duplex unit 112 to / from the printer unit 100 is good.

  The width of the opening 110 between the supports 102 is set such that the casing 112A above the duplex unit 112 can be inserted, and both sides of the casing 112A are formed on the side walls of the support 102. By rotating while being guided, the housing portion 112 </ b> A is easily attached to and detached from the opening 110. In addition, a guide for guiding the housing portion 112 </ b> A to the opening 110 can be provided on the side wall of the support 102 or the upper surface of the housing 12.

  In such an image forming apparatus 10, the optional duplex unit 112 is attached to the rear side of the printer unit 100, and the casing unit 112 </ b> A of the duplex unit 112 is inserted into the opening 110 between the printer unit 100 and the scanner unit 104. . As a result, the recording paper P discharged from the rear side to the front side of the printer unit 100 is switched back and the conveyance path is switched and conveyed to the conveyance path 56 of the duplex unit 112. For this reason, even in the printer unit 100 in which the recording paper P is discharged in a direction orthogonal to the scanning direction, the support unit 102 does not get in the way, and the duplex unit 112 is arranged behind the recording paper P in the discharging direction. it can. Accordingly, it is possible to prevent the duplex unit 112 from impairing the operability such as setting a document on the scanner unit 104 from the front of the printer unit 100. Further, since the conveyance path 56 of the duplex unit 112 is detachably attached to the printer unit 100 through the opening 110, the user can increase the conveyance path 56 as necessary. For this reason, useless cost burden is not imposed on a user who does not need a post-processing device such as the duplex unit 112.

  Next, an image forming apparatus according to a second embodiment of the present invention will be described.

  In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 6, in this image forming apparatus 200, the conveyance belt 34 side of the printer unit 201 is the front side, the optical box 24 side is the rear side, and the printer unit 201 loads the recording paper P from the front side to the rear side. It is configured to discharge. Two support members 202 that support the scanner unit 104 are provided upright at both ends on the rear side of the printer unit 201. A user stands in front of the printer unit 201 and performs operations such as setting a document on the scanner unit 104.

  An opening 210 is formed behind the printer unit 201 at a position surrounded by the two supports 202, the scanner unit 104, and the printer unit 201. A post-processing device 222 that performs post-processing on the recording paper P that has passed through the fixing device 38 is disposed behind the printer unit 201. The post-processing device 222 includes a housing unit 222B that performs post-processing at a rear position of the printer unit 201, and a housing unit 222A that is installed above the printer unit 201 by bending the upper side of the housing unit 222B in a right angle direction. It has. The casing 222A is installed so as to be inserted through the opening 210. The housing section 222A is provided with a transport path 224 that guides the recording paper P to the housing section 222B on the downstream side of the fixing device 38, and a plurality of transport roller pairs 226 are arranged along the transport path 224. . The post-processing device 222 is a sorter device in the present embodiment, but is not limited to this, and a duplex unit or the like can also be installed.

  In addition to the transport path 224 of the post-processing device 222, a discharge path 206 that discharges the recording paper P from the front side to the rear side is provided, and a transport roller pair 52 and a discharge roll 54 are arranged in the discharge path 206. It is installed. On the discharge side of the discharge roll 54, a discharge tray 214 is provided in the upper part of the housing portion 222A.

  In such an image forming apparatus 200, the housing unit 222 </ b> B of the optional post-processing device 222 is mounted behind the printer unit 201, and the post-processing device 222 is installed in the opening 210 between the printer unit 201 and the scanner unit 104. The housing portion 222A is inserted. As a result, the recording paper P that has passed through the fixing device 38 is transported to the transport path 224 of the post-processing device 222 by a switching member (not shown), and is transported along the transport path 224 from the front side to the rear side. Thus, even in the printer unit 201 in which the recording paper P is discharged in a direction orthogonal to the scanning direction, the support 202 is not obstructed, and the post-processing device 222 is disposed at the rear of the recording paper P discharge direction. Can be placed. Therefore, it is possible to prevent the post-processing device 222 from impairing the operability such as setting a document on the scanner unit 104 from the front of the printer unit 201.

  Further, since the discharge tray 214 for discharging the recording paper P is provided separately from the conveyance path 224 of the post-processing device 222, when the recording paper P is discharged from the printer unit 201, the discharge tray 214 and the post-processing device 222 are discharged. It is possible to select which of the recording papers P is conveyed. When post-processing is not performed, the recording paper P is discharged from the discharge path 206 to the discharge tray 214. For this reason, even when the post-processing device 222 is disposed, the recording paper in the discharge tray 214 can be easily taken out, and the operability is improved.

  In the above embodiment, an example in which the double-side unit 112 and the post-processing device 222 including a sorter device are mounted is shown, but the present invention is not limited to these configurations. As the post-processing device, for example, a device that performs processing such as paper folding is also applicable.

  In the example illustrated in FIG. 1 and the like, the printer unit 100 has the configuration in which the recording paper P is attracted to the conveyance belt 34 and the four color toner images are sequentially transferred. However, the configuration is not limited thereto. The configuration of the printer unit 100 of the image forming apparatus 10 can be set as appropriate, and can also be applied to an image forming apparatus that sequentially forms toner images on an image carrier using a rotary developing device.

1 is a schematic configuration diagram illustrating an image forming apparatus according to a first embodiment of the present invention. FIG. 2 is a side view illustrating a printer unit, a scanner unit, and a duplex unit in which a conveyance path is inserted into an opening of the image forming apparatus illustrated in FIG. 1. FIG. 2 is a side view illustrating a state in which the scanner unit is rotated upward with respect to the printer unit when the duplex unit is attached and detached in the image forming apparatus illustrated in FIG. 1. In the image forming apparatus shown in FIG. 1, a side view showing a state in which the scanner unit is rotated upward with respect to the printer unit and the duplex unit is rotated rearward with respect to the printer unit when the duplex unit is attached and detached. FIG. FIG. 2 is a perspective view illustrating a state where a duplex unit in which a conveyance path is inserted into an opening of the image forming apparatus illustrated in FIG. 1 is removed. It is a schematic block diagram which shows the post-processing apparatus by which a conveyance path is inserted in the printer part of the image forming apparatus which concerns on 2nd Embodiment of this invention, a scanner part, and an opening part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 12 Case (Image forming apparatus main body)
44 discharge tray 50 discharge path 56 transport path 100 printer unit 102 support 104 scanner unit 110 opening 112 double-sided unit (post-processing device)
112A Case portion 112B Case portion 200 Image forming apparatus 201 Printer portion 202 Support body 206 Discharge path 210 Opening portion 214 Discharge tray (recording medium discharge portion)
222 Post-processing device 222A Housing unit 222B Housing unit 224 Transport path P Recording paper (recording medium)
S space

Claims (5)

A scanner unit that reads an image; and a printer unit that prints an image read by the scanner unit on a recording medium and discharges the recording medium in a direction orthogonal to a scanning direction in the scanner unit ;
An image forming apparatus that supports the scanner unit on a top of the printer unit with a support, forms a space between the printer unit and the scanner unit, and discharges a recording medium from the printer unit to the space. ,
Behind the image forming apparatus main body of the space, setting the opening housing part is inserted in the conveying path detachably provided is the post-processing apparatus to said printer unit,
The width of the opening is set to be larger than the width of the casing of the conveyance path of the post-processing device,
The post-processing apparatus is configured such that the upper side rotates to the rear side with the lower part as the rotation center, and the front side rotates to the upper side with the rear part as the rotation center,
The height of the opening is such that when the post-processing device is rotated to be attached to and detached from the printer unit, the housing portion of the transport path of the post-processing device does not hit the scanner unit, and the scanner unit The image forming apparatus is characterized in that the scanner unit is set to a height that does not contact a housing unit of a conveyance path of the post-processing apparatus when the printer unit is rotated with respect to the printer unit . The printer unit discharges the recording medium from the rear side to the front side of the space, and the post-processing device includes a switchback conveyance path for switching back and conveying the discharged recording medium. The image forming apparatus according to claim 1. The printer unit discharges the recording medium from the front side to the rear side of the space ,
2. The recording apparatus according to claim 1 , wherein the printer unit is provided with a recording medium discharge unit that discharges the recording medium to the space separately from a conveying path that sends the recording medium to the conveying path of the post-processing apparatus. Image forming apparatus. The image forming apparatus according to claim 1, wherein the conveyance path of the post-processing apparatus is a return conveyance path for double-sided printing . The image forming apparatus according to any one of claims 1 to 4, characterized in that the guide for guiding the detachable housing part of the transport path of the post-processing device to the opening is provided .

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