JP7175671B2 - image forming device - Google Patents

Description

The present invention relates to an image forming apparatus such as a printer, a copying machine, a facsimile machine, and a multifunction machine having these functions.

Conventionally, sheets are discharged between an image forming unit that performs image formation and an image reading unit. 2. Description of the Related Art An image forming apparatus provided with an in-body paper discharge section is known. In such an image forming apparatus, a paper feed cassette for storing sheets is arranged below the image forming unit. The image forming apparatus is provided with a sheet conveying path on one side in the width direction of the image forming apparatus from the paper feeding cassette, and forms an image on the sheet by conveying the sheet upward in the vertical direction. Then, the sheet on which the image formation has been completed is discharged to the internal discharge section. Various control boards for controlling these image forming operations are provided on the rear surface of the image forming apparatus. A part of the frame of the image forming apparatus is made of sheet metal, and the back side of the sheet metal frame is strong enough to support the transport path in the width direction of the image forming apparatus and the control board. is designed with high standards. Conventionally, the image reading unit is placed on the sheet metal structure on the side where the transport path is provided and on the sheet metal structure on the back side for supporting the control board.

In such a support structure of the reading device, in order to improve the visibility of the paper ejection space and to facilitate the removal of the recording paper from the paper ejection section, the side opposite to the side where the transport path in the width direction of the image forming apparatus is provided. Many apparatuses do not have a sheet metal structure on the front side of the image forming apparatus. Therefore, the support strength of the image reading device on the side opposite to the side on which the conveying path is provided and on the front side of the image forming apparatus is relatively weak, which causes the image forming apparatus to deform due to its own weight. mentioned.

In order to solve such a problem, Patent Document 1 discloses an image forming apparatus having the above-described structure, in which a reinforcing frame (reference numeral 40) is provided to reinforce a weak portion of the image reading apparatus. ing. As described above, various proposals have conventionally been made regarding a support structure for suppressing deformation of an image reading apparatus.

JP 2008-225084 A

In the frame structure of Patent Document 1, the strength of the side wall portion of the image reading device is improved by providing the reinforcing frame, but the strength of the central portion of the bottom surface of the image reading device cannot be improved. That is, the frame structure of Patent Document 1 cannot suppress deformation of the bottom surface of the image reading unit into a mortar shape due to its own weight or thermal deformation during operation of the device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems. in the image forming apparatus in which the image reading device is arranged above the image forming section so that a discharge space for the sheet is formed between the image reading device and the image forming section in The unit includes a sheet metal, is arranged on the front side of the image forming apparatus relative to the sheet transport path, and includes a front-side frame that supports the image reading apparatus, and a sheet metal, and is located on the rear side of the image forming apparatus relative to the transport path. a back side frame for supporting the image reading device; and a bridging member, which is a sheet metal bridging the front side frame and the back side frame, the bridging member at one longitudinal end side of the bridging member. a bridging member fixed to the front frame and fixed to the rear frame at the other end thereof; An electric board electrically connected to the display section via a cable is attached to the rear side frame, and the bridge member is a portion fixed to the front side frame and the rear side frame in the longitudinal direction. The support surface is bent to form a support surface protruding toward the side where the image reading device is arranged from the fixed portion, and the bottom surface of the image reading device is supported by the support surface. A cable is crawled along the bridge member .

According to the present invention, deformation of the bottom surface of the image reading section placed above the image forming section can be suppressed , and noise resistance can be improved .

Schematic perspective view of an image forming apparatus Sectional view of the engine part of the image forming apparatus Cross-sectional view of an image reader Schematic perspective view showing the relationship between the frame structure of the engine section and the image reading device Diagram showing the back of the reader unit Perspective view of bridge member A perspective view showing a bridge member with supporting members attached. Schematic perspective view showing the relationship among the frame structure of the engine section, the image reading device, and the cable routing path. A schematic cross-sectional view showing the relationship among the frame structure of the engine section, the image reading device, and the cable routing path.

(Example)
As an example, the present invention will be specifically described by applying it to an electrophotographic image forming apparatus (copier). However, the configuration of the present invention is not limited to an electrophotographic image forming apparatus, and may be applied to, for example, an inkjet image forming apparatus.

The image forming apparatus according to the present embodiment is an electrophotographic system that forms an image by transferring four color toners of yellow Y, magenta M, cyan C, and black K onto an intermediate transfer belt and then transferring the image onto a sheet. It is an image forming apparatus. In the following description, although the subscripts Y, M, C, and K are attached to the members using the toners of the respective colors, the configurations and operations of the members are different except that the colors of the toners used are different. Since they are substantially the same, suffixes are omitted as appropriate unless they need to be distinguished.

FIG. 1 is a schematic perspective view of an image forming apparatus A. FIG. FIG. 2 is a schematic cross-sectional view of the image forming apparatus A. As shown in FIG. Note that FIG. 2 is a diagram in which an image reading device 21 and an operation display unit 61, which will be described later, are omitted.

The image forming apparatus A shown in FIGS. 1 and 2 includes an image reading device 21 for reading an image of a document, image data generated by reading the image by the image reading device 21, or image data transmitted from an external information device. An engine section 10 is provided for forming an image based on the image. The engine unit 10 includes an image forming unit 50 that forms an image by transferring a toner image onto a sheet shown in FIG. A fixing device 15, which is a fixing unit for fixing, is provided. Further, the engine section 50 includes a paper feed cassette 81 below the image forming section 50 in the vertical direction. Further, the image reading device 21 is arranged vertically above the engine section 10, and the image reading device 21 is supported by the engine section 10 as described later.

The image forming section 50 includes process cartridges 4 (4Y, 4M, 4C, 4K), primary transfer rollers 5 (5Y, 5M, 5C, 5K), a laser scanner unit 8, and an intermediate transfer unit . The process cartridge 4 includes photoreceptor drums 1 (1Y, 1M, 1C, 1K), charging rollers 2 (2Y, 2M, 2C, 2K) for charging the surfaces of the photoreceptor drums 1, developing devices 3 (3Y, 3M, 3C, 3K).

The intermediate transfer unit 7 includes an intermediate transfer belt 6, a secondary transfer roller 9, a secondary transfer opposing roller 12, an idler roller 19, a tension roller 18, and the like. The intermediate transfer belt 6 is an endless belt stretched around the secondary transfer facing roller 12, the idler roller 19, and the tension roller 18. The secondary transfer facing roller 12 is rotated by the driving force of the driving source. Follows and moves around.

The image reader 21 includes a flatbed scanner 22 and an automatic document feeder 23 . The flatbed scanner 22 optically reads an image of a document placed on a platen (not shown) and converts it into image data. The automatic document feeder 23 automatically conveys the documents stacked on the document tray 24 and reads the images. The automatic document feeder 23 is rotatably supported, and a platen (not shown) can be accessed by rotating the automatic document feeder 23 and opening it upward.

In addition, on the front surface 20b of the apparatus main body 20 of the image forming apparatus A, an operation display section 61 having a display section 61a for displaying information and an operation section 61b for setting image formation such as the number of images to be formed is provided. . The operation display unit 61 is rotatably supported with respect to the apparatus main body of the image forming apparatus A in order to ensure visibility in response to reflection of illumination, height difference of the user, and the like. When the image forming apparatus A is viewed from the front, the operation display section 61 is arranged on the right side, and the discharge section 17 for discharging the sheet S on which an image is formed is arranged on the left side.

Next, the image forming operation will be described. First, when a control unit (not shown) receives an image forming job signal, the sheets S stacked and stored in the paper feed cassette 81 by the feed roller 11, the transport roller 13, and the registration roller 14 are transferred to the secondary transfer roller 9 and the secondary transfer roller 9. It is sent to the secondary transfer portion formed from the opposing roller 12 . The paper feed cassette 81 is detachable from the main body of the image forming apparatus A by grasping the grip portion 25 and pushing/pulling it.

In the image forming section 50 , first, the surface of the photosensitive drum 1 is uniformly charged by the charging roller 2 . After that, according to image data transmitted from an external device (not shown), the laser scanner unit 8, which is an exposure unit, irradiates the surface of the photosensitive drum 1 of each color with a laser beam from a light source (not shown). to form an electrostatic latent image.

After that, toner of each color is applied to the electrostatic latent image formed on the surface of the photosensitive drum 1 by the developing device 3 to form a toner image on the surface of the photosensitive drum 1 . A toner image formed on the surface of the photosensitive drum 1 is primarily transferred to the intermediate transfer belt 6 by applying a bias to the primary transfer roller 5 . As a result, a full-color toner image is formed on the intermediate transfer belt 6 surface.

Thereafter, the toner image is sent to the secondary transfer portion as the intermediate transfer belt 6 rotates. Then, the toner image on the intermediate transfer belt 6 is transferred onto the sheet S by applying a bias to the secondary transfer roller 9 in the secondary transfer portion.

Next, the sheet S onto which the toner image has been transferred is subjected to heat and pressure processing in the fixing device 15, whereby the toner image on the sheet S is fixed to the sheet S. FIG. After that, the sheet S on which the toner image is fixed is discharged to the discharge section 17 by the discharge roller 16 .

As shown in FIG. 1, the image forming apparatus A conveys the sheet accommodated in the paper feed cassette 81 to the secondary transfer portion located vertically above the paper feed cassette 81, and furthermore, transfers the sheet to the secondary transfer portion. It has a so-called vertical path conveying path for conveying to the fixing device 15 arranged on the upper side in the circular force direction.

(Image reader)
Next, the image reading device 21 will be described. FIG. 3 is a schematic cross-sectional view of the image reading device 21. As shown in FIG. The image reading device 21 shown in FIG. 2 includes a reader unit 22, an ADF 23, a document tray 104, a width regulating plate 105, a pickup roller 106, separation pads 107 and 108, a first registration roller 109, and a second registration roller 110. be done. The image reading device 21 also has a first conveying roller 111 , a second conveying roller 112 , a third conveying roller 113 , a white guide plate 114 , a fourth conveying roller 115 , a paper discharge roller 116 and a paper discharge tray 117 . The image reader 21 also has a reading glass 118 , light sources 119 and 120 , mirrors 121 , 122 and 123 , an imaging lens 124 , a line sensor 125 and a signal processing board 126 . The carriage 127 integrally holds the light sources 119 and 120, the mirrors 121, 122 and 123, the imaging lens 124, the line sensor 125 and the signal processing board 126. FIG. A motor 127 is further attached to the carriage 127 , and the carriage 127 is moved along the guide rail 128 by the motor driver 130 operating the motor 127 when reading the document placed on the document platen 118 .

As shown in FIG. 3, the document 103 is placed on the document tray 104 . The width regulating plate 105 suppresses oblique conveyance of the document 103 . The stack of documents placed on the document tray 104 is delivered to the separation unit by the pickup roller 106 when reading is started. In the separation unit, the separation pad 107 and the separation roller 108 separate the uppermost sheet of the document bundle one by one.

The separated sheet of document is corrected for oblique conveyance by the first registration roller 109, and then conveyed to the second registration roller 110, the first conveying roller 111, the second conveying roller 112, and the third conveying roller 113. be. After passing through the third conveying roller 113 , the document 103 is conveyed by the fourth conveying roller 115 and the discharge roller 116 and discharged to the discharge tray 117 . A path from the document tray 104 to the discharge tray 117 constitutes a transport path for the document 103 . The document 103 is conveyed along this conveying path. Further, each roller functions as a conveying means for conveying the document 103 .

When the document 103 passes over the reading position set between the second transport roller 112 and the third transport roller 113 , the light sources 119 and 120 irradiate the surface of the document 103 with light. Reflected light from the document 103 is guided to an imaging lens 124 by mirrors 121 , 122 and 123 . A white guide plate (also referred to as a background plate) 114 is arranged at a position facing the reading position, sandwiching the transport path of the document 103 . The white guide plate 114 presses the document 103 so that the document 103 does not float away from the reading glass 118 at the reading position. Further, the surface of the white guide plate 114 is optically read at the timing when the document 103 does not exist on the reading position. The image data (background image) obtained by reading is used to determine whether or not foreign matter such as dust adheres to the reading position.

The reflected light is converged by an imaging lens 124 and formed into an image on a line sensor 125 in which an imaging element such as a CCD (Charge Coupled Device) is arranged along a line. The imaged optical signal is converted into an electric signal by the line sensor 125 and converted into a digital signal by the signal processing board 126 . Image data is thus obtained. A configuration including light sources 119, 120, mirrors 121, 122, 123, imaging lens 124, line sensor 125, and signal processing board 126 functions as image acquisition means. The image acquisition unit acquires an image of the document 103 as a document image at the reading position. Further, the image acquisition means acquires the image data of the white guide plate 114 as the background image at the reading position.

In this embodiment, the bottom surface 130 of the image reading device 21 is made of sheet metal. The reader unit 22 has a box-shaped sheet metal frame, and the sheet metal is covered with a resin member. The bottom surface 130 is the bottom surface that is continuous with the sidewalls of the box-shaped sheet metal. The bottom surface 130 supports each member included in the reader unit 22 directly on the metal plate 130 or indirectly via members. For example, if the sheet metal 130 is deformed into a mortar shape by the weight of each member included in the reader unit 22, the position of the carriage 127 is changed and the guide rail 128 is tilted, resulting in a decrease in image reading accuracy. . A configuration for suppressing such deformation of the bottom surface of the image reading device 21 will be described below.

FIG. 4 is a schematic perspective view showing the relationship between the frame structure of the engine section 10 and the image reading device 21 in this embodiment. As shown in FIG. 4, the engine section 10 has a frame structure including a front side frame 401, a rear side frame 402, a stay 403, a bridge member 404, a first support section 405, a second support section 406, and a third support section 407. Prepare. Although the front side frame 401, the rear side frame 402, the bridge member 404, and the stay 403 in this embodiment are made of sheet metal, they may partially contain resin. The material of the first supporting portion 405, the second supporting portion 406, and the third supporting portion 407 may be resin or sheet metal.

Although the first support part 405 is depicted as a separate body from the front frame 401 in FIG. In that case, the first support part 405 may be made of sheet metal. In FIG. 4, the second support section 406 and the third support section 407 are depicted as separate bodies from the rear side frame 402, but at least one of the second support section 406 and the third support section 407 is provided on the rear side. It may be configured integrally with the frame 402 . In that case, the parts of the second support part 406 and the third support part 407 that are integrated with the rear frame 402 can be made of sheet metal.

The front-side frame 401 forms a front-side support frame of the image forming apparatus, and the rear-side frame 402 forms a rear-side support frame of the image forming apparatus. Here, the front-side frame 401 is positioned on the front side of the image forming apparatus A from the sheet transport path, and the back-side frame 402 is positioned on the back side of the image forming apparatus A from the sheet transport path. That is, the conveying path of the sheet on which the image is formed is positioned between the front frame 401 and the back frame 402 .

The stay 403 is a reinforcing member that connects the front side frame 401 and the rear side frame 402, and functions as a beam. Similarly, the bridging member 404 is a reinforcing member that connects the front side frame 401 and the rear side frame 402, and functions as a beam. A stay (not shown) is provided in addition to the stay 403 and the bridge member 404 , and the frame of the image forming apparatus A is formed by a beam structure including the front side frame 401 , the rear side frame 402 , the stay 403 and the bridge member 404 . ing.

The first support portion 405 is provided on the upper side of the front frame 401 in the vertical direction and on the side where the transport path of the vertical path is formed in the width direction of the image forming apparatus A. As shown in FIG. The second support portion 406 is provided on the vertically upper side of the rear side frame 402 and on the side where the vertical path transport path is formed in the width direction of the image forming apparatus A. As shown in FIG. The third support portion 407 is provided on the vertically upper side of the rear side frame 402 and on the side where the vertical path conveying path is formed in the width direction of the image forming apparatus A. As shown in FIG. The first supporting portion 405, the second supporting portion 406, and the third supporting portion 407 are closer to the outer surface of the image reading device 21 than the support surface provided on the bridge member 404, which will be described later, in the plane direction of the platen glass 118. Support the side vertically from below.

In the image forming apparatus A of this embodiment, a supporting portion for supporting the image reading device 21 is not provided on the side opposite to the side on which the vertical path conveying path is formed in the width direction of the image forming apparatus A. First, when the image forming apparatus A is viewed from the front side, the left side of the first support portion 405 is an open space. Therefore, an in-body paper discharge space is formed between the image reading device 21 supported by the first support portion 405 , the second support portion 406 and the third support portion 407 and the engine portion 10 . Further, since no supporting portion for supporting the image reading device 21 is provided on the opposite side of the image forming apparatus A in the width direction of the image forming apparatus A from the side on which the vertical path conveying path is formed, the user does not need to set the discharge space. Usability such as visibility and sheet removal is ensured.

Next, the rear side of the image reading device 21 will be described. FIG. 5 is a diagram showing the back surface of the reader unit 22. As shown in FIG. The reader unit 22 has an exterior wall 501 , a first hinge 502 , a second hinge 503 and a bottom surface 504 . An exterior wall 501 is a wall surrounding a box-shaped sheet metal. The first hinge 502 and the second hinge are fixed to the rear frame 402 on the rear side of the image forming apparatus A or to a fixing member (not shown) fixed thereto. Therefore, the image reading device 21 has a structure in which the front side of the image forming apparatus A can be vertically moved with respect to the engine section 10 with the back side of the image forming apparatus A as a rotation axis.

The bottom surface 504 is the bottom surface of the box-shaped sheet metal 504 . A first supported portion 505 made of sheet metal is attached to the bottom surface 504 . Also, the bottom surface 504 is drawn. The bottom surface 504 includes, as drawn portions, a convex portion 506 as a second supported portion and a convex portion 507 as a third supported portion. The first supported portion 505 has a supported seat surface supported by the first support portion 405 . The convex portion 506 has a supported seat surface that is supported by the second support portion 406 . The convex portion 507 has a supported seat surface that is supported by the third support portion 407 . A supported surface 508 shown in FIG. 5 is a portion supported by a bridge member 404 which will be described later.

(bridge member)
Next, the bridge member 404 will be described in detail with reference to FIGS. 4, 6, 7, 8 and 9. FIG.

First, the shape of the bridging member 404 will be described with reference to FIG. As shown in FIG. 6, the bridge member 404 is a sheet metal elongated in one direction. The bridging member 404 in this embodiment is subjected to bending and drawing. The bridging member 404 has an upright bending portion 607 and an upright bending portion 608 in a direction perpendicular to the longitudinal direction and the thickness direction (hereinafter referred to as a lateral direction). A bent portion 607 and a bent portion 608 are portions bent along the longitudinal direction of the bridge member 404 . By providing such standing bent portions 607 and 608, the bridging member 404 is less likely to bend in the lateral direction. In addition, a constricted portion 609 is formed in the bridge member 404 . By performing such a drawing process, the bridging member 404 becomes difficult to bend in the lateral direction.

As shown in FIG. 6, the bridging member 404 is bent (bent) at a plurality of positions in the longitudinal direction of the bridging member 404 . The bridging member 404 of this embodiment is bent at four points, ie, a bent portion 611 , a bent portion 612 , a bent portion 613 and a bent portion 614 . Bending portion 611, bending portion 612, bending portion 613, and bending portion 614 are arranged in order from one end side (left end portion in FIG. 6) of bridging member 404. It is The bent portions 611 and 614 are bent in the same direction, and the bent portions 612 and 613 are bent in opposite directions to the bent portions 611 and 614 .

Since the bridging member 404 is bent in this way, the first fixed portion located on the left side of the bent portion 611 and the second fixed portion located on the right side of the bent portion 614 in FIG. A support surface 610, which will be described later, can protrude toward the side where the image reading device is arranged.

A first fixed portion fixed to the front side frame 401 is provided on the left side of the bent portion 611 in FIG. The first fixed portion is provided with a positioning protrusion 605 that is inserted into an opening (not shown) or a notch provided in the front frame 401 . Further, screw holes 601 and 602 for passing screws for fixing the bridge member 404 to the front side frame 401 are formed in the first fixed portion. After positioning the positioning protrusion 605 by inserting it into an opening (not shown) or a notch portion provided in the front frame 401, the assembly worker inserts screws (not shown) into the screw holes 601 and 602 and inserts the screws (not shown) into the front frame 401. , one end side of the bridging member 404 is fixed.

A second fixed portion fixed to the rear side frame 402 is provided on the right side of the bent portion 614 in FIG. The second fixed portion is provided with a positioning projection 606 that is inserted into an opening (not shown) or a notch portion provided in the back side frame 402 . Further, screw holes 603 and 604 for passing screws for fixing the bridge member 404 to the back side frame 402 are formed in the second fixed portion. After positioning the positioning projections 606 by inserting them into openings or cutouts (not shown) provided in the rear frame 402 , the assembly worker inserts screws (not shown) into the screw holes 603 and 604 to insert the positioning projections 606 into the rear frame 402 . , the other end of the bridging member 404 is fixed.

By such assembly work, the bridge member 404 is bridged over the front side frame 401 and the rear side frame 402 as shown in FIG. As described above, the bridge member 404 is a main frame including the front frame 401 and the rear frame 402 together with other stays for functioning as one beam connecting the front frame 401 and the rear frame 402. Contributes to strengthening the body structure. That is, plastic deformation of the frame structure of the engine section 10 can be suppressed when a load or impact is applied to the image reading device 21 from the outside. Further, the angle of the bent portion provided in the bridge member 404, the length between the bent portions, and the length of the bridge member 404 itself depend on the specifications of the image forming apparatus A and the image reading apparatus 21 (the front side frame 401 and the rear side frame 401). 402, the rigidity of the frame required for design, etc.).

When the bridge member 404 is fixed to the front-side frame 401 and the rear-side frame 402, the support surface 610 protrudes toward the image reading device 21 more than the first fixed portion and the second fixed portion. The portion between the first bent portion 611 and the second bent portion 612 in the longitudinal direction of the bridging member 404 and the portion between the third bent portion 613 and the fourth bent portion 614 in the longitudinal direction of the bridging member 404 are It becomes a leg that supports the support surface 610 .

FIG. 7 shows a support structure in which a support member 701 for supporting the image reading device 21 is attached to the bridge member 404 shown in FIG. The support member 701 is a member made of resin, and is fixed to the support surface 610 of the bridge member 404 with a screw or an adhesive. That is, the support surface 610 of the bridge member 404 of this embodiment indirectly supports the image reading device 21 via the support member 701 . It should be noted that the bridge member 404 may be subjected to a drawing process or a bending process so that the bridge member 404 directly supports the image reading device 21 .

The support member 701 has a contact surface 702 as a seat surface that contacts the bottom surface 504 of the image reading device 21 , and the contact surface 702 supports the bottom surface 504 of the image reading device 21 . The supporting member 701 can support the central side of the bottom surface 504 (the center of gravity of the bottom surface 504 ) from the side wall of the image reading device 21 more than the first supporting portion 405 , the second supporting portion 406 , and the third supporting portion 407 . Therefore, by providing the support member 701, the conical deformation of the bottom surface 504 of the image reading device 21 can be suppressed as compared with an apparatus without the support member 701 provided.

A ground member 703 is provided on the contact surface 702 , and the bottom surface 504 of the image reading device 21 that contacts the contact surface 702 contacts the ground member 703 . Ground member 703 is also connected to bridging member 404 . The front side frame 401 and the rear side frame 402 are grounded by a structure not shown. Therefore, the bottom surface 504 of the image reading device 21 that contacts the contact surface 702 is grounded via the metal member 703 , the bridge member 404 , the front frame 401 and the rear frame 402 . The noise resistance of the image forming apparatus A can be improved by the grounding mechanism.

By designing the length of the bridging member 404 and the position of the bending portion arbitrarily, the supporting position of the image reading device 21 by the bridging member 404 can be arbitrarily formed in accordance with the position of the bottom surface 504 of the image reading device 21 . can be done.

8 and 9 are diagrams showing other utilization examples of the bridging member 404. FIG. As shown in FIG. 9, an electric board 901 is fixed to the rear frame 402 . One end of a cable is connected to the electric board 901 , and the other end of the cable is connected to the operation display section 61 . Instructions from the user input from the operation display unit 61 (paper setting, number of prints setting, magnification setting, color/monochrome setting, double-sided/single-sided printing setting, scan setting, FAX transmission instruction) are sent to the electric board 901 via a cable. It is input to the mounted controller (not shown). Further, the state of the image forming apparatus A is displayed on the display section 61a from the controller via a cable.

The cable 802 is a conventional cable crawling path, that is, a cable crawling path along which the vicinity of the engine section 10 is laid. On the other hand, the cable 801 is a crawling path along the bridging member 404 . Since noise is emitted from various electrical components of the engine section 10, it is preferable to increase the distance H between the engine section 10 and the cable 205 in order to increase the noise resistance. In this embodiment, by providing the cable 801 along the bridging member 404 , the noise emitted from the engine section 10 is less likely to act on the cable 801 . Here, if the distance between the cable 802 and the engine part 10 is H1, and the distance between the cable 801 and the engine part 10 is H2, then H2>H1, and the cable 802 is routed instead of the conventional cable 801 route. It can be seen that the higher resistance to radiation noise is higher.

As described above, according to the image forming apparatus of this embodiment, by providing the bridging member 404, the strength of the frame structure of the engine section can be improved, and the deformation of the bottom surface of the image reading device 21 can be suppressed. can.

21 image reading device 401 front side frame 402 rear side frame 404 bridging member 504 bottom surface of image reading device 610 support section 701 support member

Claims (7)

an image reading device for reading a document; an image forming unit for forming an image read by the image reading device on a sheet; In an image forming apparatus in which the image reading device is arranged above the image forming unit in the vertical direction so that the image is formed,
The image forming unit
a front-side frame that includes a sheet metal, is arranged on the front side of the image forming apparatus relative to the sheet conveying path, and supports the image reading apparatus;
a rear-side frame that includes a sheet metal, is arranged on the rear side of the image forming apparatus relative to the transport path, and supports the image reading device;
A bridging member, which is a sheet metal bridged between the front side frame and the back side frame, wherein one longitudinal end of the bridging member is fixed to the front side frame, and the other longitudinal end of the bridging member is fixed to the back side frame. a bridging member secured to the
further comprising a display unit provided on the front side of the image forming apparatus for displaying information;
An electric board electrically connected to the display unit via a cable is attached to the rear frame,
The bridging member is bent in the longitudinal direction such that a support surface protruding from the fixing portion to the side where the image reading device is arranged is formed between the fixing portions for the front side frame and the rear side frame. and
a bottom surface of the image reading device is supported by the support surface ;
The image forming apparatus , wherein the cable is laid along the bridging member . 2. The image forming apparatus according to claim 1, wherein the bridging member has a drawn portion drawn along the longitudinal direction. 3. The image forming apparatus according to claim 2, wherein the narrowed portion is formed across the bent portion of the bridge member . 4. The bridge member according to any one of claims 1 to 3, wherein at least one end side of the bridge member has a bent portion bent with respect to the support surface in a direction perpendicular to the thickness direction and the longitudinal direction. image forming device. 5. The image forming apparatus according to claim 4, wherein the bent portion is formed across the bent portion of the bridge member . 6. A resin member is attached to the support surface to contact a bottom surface of the image reading device, and the bottom surface of the image reading device is supported by the resin member. 10. The image forming apparatus according to claim 1. The bottom surface of the image reading device is formed of sheet metal,
7. The image forming apparatus according to claim 6, wherein a metal member is attached to said resin member so as to contact said image reading device and said bridge member for grounding said image reading device.

Images