JP5110050B2 - Image reading apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to an image reading apparatus and an image forming apparatus.

  As an image reading apparatus, an image reading apparatus disclosed in Patent Document 1 is known. The image reading apparatus disclosed in Patent Document 1 reflects light emitted from an LED as much as possible in a light guide body under total reflection conditions and guides the light to a light guide body exit surface, and a short axis direction (sub-scanning direction) on a document surface. In addition to improving the light intensity and optimizing the shape of the light guide entrance surface, the angle of the light beam in the long axis direction (main scanning direction) is controlled, so that illumination light with a uniform intensity distribution is irradiated onto the document surface. Get the shape of the light guide. Furthermore, a reflection part is provided on the side opposite to the emission side to improve the light irradiation efficiency to the image reading target area.

Japanese Patent Laying-Open No. 2005-252646 (FIG. 1)

  This invention makes it a subject to suppress that a light emission part contacts another component when attaching or detaching the attachment member to which the light emission part was fixed to a moving body.

According to a first aspect of the present invention, there is provided a movable body that can move along the surface to be read, a light emitting unit that emits light toward the surface to be read, and reflected light that is emitted from the light emitting unit and reflected by the surface to be read. A detecting unit for detecting, a light-emitting unit fixed to the light guide member attached to the moving body, a mounting member attached to the moving body so as to be detachable independently, and the mounting member to and from the moving body And a restricting means for restricting the mounting member from moving to the light guide member side, and the light guide member is disposed obliquely above the light emitting portion to transmit light from the light emitting portion. The regulating means is guided to the surface to be read, and the regulating means prevents lateral movement of the mounting member by sandwiching the side wall of the moving body between the mounting member and the mounting member by striking the lower end of the side wall. By preventing the upward movement, the light emitting unit The restricted movement of obliquely upward, and an image reading apparatus which permits movement along the side wall of the mounting member.

  According to a second aspect of the present invention, the mounting member is formed of a plate body, the restricting means has a claw portion protruding from the plate body along the plate body, and the claw portion is formed of the plate body. The image reading apparatus according to claim 1, wherein the attachment member is prevented from moving with respect to the movable body along a thickness direction.

  According to a third aspect of the present invention, the held portion is formed on the mounting member, and the held portion is formed on the movable body so that the mounting member moves in a direction not regulated by the regulating means. An image reading apparatus according to claim 1, further comprising a holding unit that guides and holds the held portion.

  A fourth aspect of the invention includes the image reading apparatus according to any one of the first to third aspects, and an image recording apparatus that records an image on a recording medium based on the image read by the image reading apparatus. An image forming apparatus.

According to the configuration of the first aspect of the present invention, the light emitting unit comes into contact with the light guide member as compared with the case where the attachment member to which the light emitting unit is fixed is not provided with a restricting means for restricting movement to the light guide member side. Can be suppressed.

According to the structure of Claim 2 of this invention, compared with the case where a control means does not have a nail | claw part, it suppresses that a light emission part contacts the light guide member in the thickness direction side of the board as an attachment member. it can.

According to the configuration of the third aspect of the present invention, it is possible to maintain a state in which the light emitting unit is not in contact with the light guide member as compared with the case where the holding unit is not formed on the moving body.

  According to the configuration of the fourth aspect of the present invention, even when the mounting member to which the light emitting unit is fixed is attached / detached as compared with the case where the image reading device according to any one of the first to third aspects is not provided. Variations in images formed before and after attachment / detachment can be made difficult to occur.

1 is a schematic diagram illustrating an overall configuration of an image forming apparatus according to an exemplary embodiment. FIG. 2 is a schematic diagram illustrating a configuration of an image forming unit according to the present embodiment. 1 is a schematic diagram illustrating a configuration of an image reading apparatus according to an embodiment. It is the schematic which shows the structure of the light irradiation unit which concerns on this embodiment. It is a perspective view which shows the structure of the light irradiation unit which concerns on this embodiment. It is a perspective view which shows the structure of each component of the light irradiation unit which concerns on this embodiment. It is a perspective view which shows the structure of the bracket which concerns on this embodiment, and a light irradiation part. It is a perspective view which shows the attachment state by which the light irradiation part was attached to the bracket which concerns on this embodiment. It is a perspective view which shows the removal state in which the bracket which concerns on this embodiment was removed from the 1st carriage. It is a side view which shows the removal state from which the bracket which concerns on this embodiment was removed from the 1st carriage. It is a side view which shows the state in the middle of the bracket which concerns on this embodiment being attached to a 1st carriage. It is a side view which shows the attachment state with which the bracket which concerns on this embodiment was attached to the 1st carriage.

Below, an example of an embodiment concerning the present invention is described based on a drawing.
(Configuration of image forming apparatus according to the present embodiment)
First, the configuration of the image forming apparatus according to the present embodiment will be described. FIG. 1 is a schematic diagram illustrating a configuration of an image forming apparatus according to the present embodiment.

  As shown in FIG. 1, the image forming apparatus 10 according to the present embodiment includes an image reading device 11 that reads an image of a document G, and an image recording device 21 that records an image on a recording medium P such as paper. ing. The image reading device 11 is disposed on the upper portion of the image forming device 10, and the image recording device 21 is disposed on the lower portion of the image forming device 10. Note that an arrow UP shown in the drawing indicates a vertically upward direction.

  The image reading device 11 is configured to read an image of the original G and convert the read image into an image signal. The image recording device 21 is configured to record an image on the recording medium P based on the image signal converted by the image reading device 11. Hereinafter, specific configurations of the image reading device 11 and the image recording device 21 will be described.

(Configuration of the image recording apparatus 21 according to the present embodiment)
First, the configuration of the image recording apparatus 21 according to the present embodiment will be described.

  As shown in FIG. 1, the image recording apparatus 21 includes a plurality of recording medium storage units 80 that store recording media P such as paper, an image forming unit 27 that forms an image on the recording medium P, and a plurality of recording units. A transport unit 29 that transports the recording medium P from the medium storage unit 80 to the image forming unit 27, a first discharge unit 69, a second discharge unit 72, and the recording medium P on which an image is formed by the image forming unit 27. A third discharge unit 76 and a control unit 71 that controls the operation of each unit of the image recording apparatus 21 are provided.

  The image forming unit 27 includes image forming units 30Y, 30M, 30C, and 30K that form toner images of yellow (Y), magenta (M), cyan (C), and black (K), and image forming units 30Y, 30Y, The intermediate transfer belt 32 as an example of an intermediate transfer body to which toner images formed by 30M, 30C, and 30K are transferred, and the toner images formed by the image forming units 30Y, 30M, 30C, and 30K are transferred to the intermediate transfer belt 32. A first transfer roller 46 as an example of a first transfer member for transferring, and a first image for transferring the toner image transferred to the intermediate transfer belt 32 by the first transfer roller 46 from the intermediate transfer belt 32 to the recording medium P. The second transfer roll 60 as an example of the two transfer members and the second transfer roll 60 are transferred from the intermediate transfer belt 32 to the recording medium P. A fixing device 64 for fixing the toner image on the recording medium P, and a.

  The image forming units 30Y, 30M, 30C, and 30K are arranged side by side at the center in the vertical direction of the image recording device 21 in a state inclined with respect to the horizontal direction. Further, as shown in FIG. 2, the image forming units 30Y, 30M, 30C, and 30K are photosensitive members that rotate in one direction (counterclockwise in FIG. 1) as an image holding body that holds the formed toner image. Each has a drum 34.

  Around each photosensitive drum 34, in order from the upstream side in the rotation direction of the photosensitive drum 34, a charging device 36 for charging the photosensitive drum 34, and the photosensitive drum 34 charged by the charging device 36 are exposed to expose the photosensitive drum 34. An exposure device 40 that forms an electrostatic latent image on the drum 34, a developing device 42 that develops the electrostatic latent image formed on the photosensitive drum 34 by the exposure device 40 to form a toner image, and a photosensitive drum 34. A removal device 44 for removing toner remaining on the photosensitive drum 34 after the formed toner image is transferred to the intermediate transfer belt 32 is provided.

  The exposure device 40 is configured to form an electrostatic latent image based on the image signal sent from the control unit 71 (see FIG. 1). Examples of the image signal sent from the control unit 71 include an image signal generated by the image reading device 11 and an image signal acquired by the control unit 71 from an external device.

  As shown in FIG. 1, the intermediate transfer belt 32 is disposed above the image forming units 30Y, 30M, 30C, and 30K, a driving roll 48 that applies a driving force to the intermediate transfer belt 32, and a second transfer. A counter roll 50 facing the roll 60, a tension applying roll 54 for applying tension to the intermediate transfer belt 32, a first driven roll 56, and a second driven roll 58 are wound around at a predetermined tension. .

  The intermediate transfer belt 32 is applied with a rotational force by a driving roll 48 and circulates and moves in one direction (A direction in FIG. 1) while being in contact with the photosensitive drum 34.

  A removing device 52 for removing the toner remaining on the intermediate transfer belt 32 is provided at a position facing the drive roll 48 with the intermediate transfer belt 32 interposed therebetween.

  Above the intermediate transfer belt 32, a toner cartridge 38Y that stores toner of each color supplied to the developing device 42 of each color of yellow (Y), magenta (M), cyan (C), and black (K), 38M, 38C, and 38K are provided.

  The first transfer roll 46 faces the photosensitive drum 34 with the intermediate transfer belt 32 interposed therebetween. A space between the first transfer roll 46 and the photosensitive drum 34 is a first transfer position where the toner image formed on the photosensitive drum 34 is transferred to the intermediate transfer belt 32.

  The second transfer roll 60 faces the counter roll 50 with the intermediate transfer belt 32 interposed therebetween. A space between the second transfer roll 60 and the opposing roll 50 is a second transfer position where the toner image transferred to the intermediate transfer belt 32 is transferred to the recording medium P.

  The transport unit 29 includes a feed roll 88 that feeds the recording medium P stored in each of the recording medium storage units 80, a transport path 62 that transports the recording medium P sent to the transport roll 88, and the transport path 62. Conveying rolls 90, 92, and 94 are provided for transporting the recording medium P arranged and sent out by the sending roll 88 to the second transfer position.

  The fixing device 64 is disposed downstream in the transport direction from the second transfer position, and fixes the toner image transferred at the second transfer position to the recording medium P.

  A transport roll 66 for transporting the recording medium P on which the toner image is fixed is provided downstream of the fixing device 64 in the transport direction. A switching member 68 for switching the conveyance direction of the recording medium P is provided on the downstream side of the conveyance roll 66 in the conveyance direction. On the downstream side of the switching member 68 in the transport direction, a first discharge roll that discharges the recording medium P transported to one side (right side in FIG. 1) of the transport direction switched by the switching member 68 to the first discharge unit 69. 70 is provided.

  Further, on the downstream side in the transport direction of the switching member 68, a transport roll 73 that transports the recording medium P transported to the other side (upper side in FIG. 1) of the transport direction switched by the switching member 68, and a transport roll 73. A second discharge roller 74 that discharges the recording medium P to be transported to the second discharge unit 72 and a third discharge roller 78 that discharges the recording medium P transported by the transport roller 73 to the third discharge unit 76 are provided. It has been.

  A reversal conveyance path 100 is formed on the side of the fixing device 64 to convey the recording medium P that has been reversed by reversing the conveyance roll 73. A plurality of transport rolls 102 are provided along the reverse transport path 100 in the reverse transport path 100. The recording medium P transported by these transport rolls 102 is sent again to the second transfer position by the transport roll 94.

  Next, an image forming operation for forming an image on the recording medium P in the image recording apparatus 21 according to the present embodiment will be described.

  In the image recording apparatus 21 according to the present embodiment, the recording medium P sent out from any of the plurality of recording medium storage units 80 is sent to the second transfer position by the transport rollers 90, 92, and 94.

  On the other hand, in the image forming units 30Y, 30M, 30C, and 30K, the exposure device 40 forms an electrostatic latent image on the photosensitive drum 34 based on the image signal acquired from the image reading device 11 or an external device, and the electrostatic latent image. A toner image based on is formed. The color toner images formed by the image forming units 30Y, 30M, 30C, and 30K are superimposed on the intermediate transfer belt 32 at the first transfer position to form a color image. Then, the color image formed on the intermediate transfer belt 32 is transferred onto the recording medium P at the second transfer position.

  The recording medium P to which the toner image has been transferred is conveyed to the fixing device 64, and the transferred toner image is fixed by the fixing device 64. When an image is formed only on one side of the recording medium P, after the toner image is fixed, the recording medium P is discharged to one of the first discharge unit 69, the second discharge unit 72, and the third discharge unit 76. The

  When forming an image on both sides of the recording medium P, after the image is formed on one side, the recording medium P is reversed by the conveyance roll 73 and sent to the reverse conveyance path 100. Further, the sheet is fed again from the reverse conveyance path 100 to the second transfer position by the conveyance roll 94, an image is formed on the opposite surface side in the same manner as described above, and an image is formed on both surfaces of the recording medium P. As described above, a series of image forming operations are performed.

  The configuration of the image recording device 21 is not limited to the above-described configuration. For example, the image recording device 21 may be a direct transfer type image recording device that does not have an intermediate transfer member or an inkjet type image recording device. An image recording apparatus other than the above configuration may be used as long as it is a recording apparatus.

(Configuration of the image reading apparatus 11 according to the present embodiment)
Next, the configuration of the image reading device 11 will be described.

  As shown in FIG. 3, the image reading device 11 includes a document conveying device 12 that conveys the document G, and an image reading unit 14 that reads an image of the document G conveyed by the document conveying device 12. The document conveying device 12 is arranged at the upper part of the image reading device 11, and the image reading unit 14 is arranged at the lower part of the image reading device 11.

  The document transport device 12 includes a document storage unit 13 that stores the document G, a document discharge unit 33 that discharges the document G, and a transport unit 16 that transports the document G from the document storage unit 13 to the document discharge unit 33. I have.

  The conveyance unit 16 includes a delivery roll 15 that sends out the document G stored in the document storage unit 13 from the document storage unit 13, and a plurality of conveyance rolls 25 that convey the document G sent out to the delivery roll 15 to the downstream side in the conveyance direction. The discharge roller 35 is configured to discharge the document G transported to the transport roller 25 to the document discharge unit 33. The plurality of transport rolls 25 and discharge rolls 35 are arranged along a transport path 23 through which the document G sent out from the document storage unit 13 is transported.

  The image reading unit 14 is configured to read both images of a document G being transported by the document transport device 12 and a document G placed on a first platen glass 43A described later. A housing 41 is provided.

  On top of the housing 41, the original G is placed and conveyed by a first platen glass 43 A as an example of a first transmitting member that transmits light L for reading an image of the original G and the original conveying device 12. A second platen glass 43B as an example of a second transmissive member that transmits the light L for reading the document G is provided.

  The document conveying device 12 is attached to the image reading unit 14 so as to be openable and closable, and the document G is placed on the first platen glass 43A when the document conveying device 12 is opened.

  The image reading unit 14 irradiates the reading surface (image surface) of the document G with the light L, and the light L is irradiated from the light irradiation unit 17 to the reading surface of the document G. A light guide unit 19 that guides the reflected light L reflected by the reading surface, an imaging lens 24 that forms an optical image of the light L guided by the light guide unit 19, and an optical image that is formed by the imaging lens 24 And a detection unit 26 for detecting.

  The light irradiation unit 17 includes a first carriage 18 as an example of a movable body that can move along the first platen glass 43A, a light irradiation unit 59 that is provided on the first carriage 18 and irradiates the original G with light L, And a first mirror 75 that is provided on the first carriage 18 and reflects the reflected light L reflected by the original G. The specific configuration of the light irradiation unit 17 will be described later.

  The light guide unit 19 reflects the second carriage 22 as an example of another moving body that can move along the first platen glass 43A, and the reflected light L that is provided on the second carriage 22 and reflected by the first mirror 75. And a third mirror 45B that is provided on the second carriage 22 and reflects the reflected light L reflected by the second mirror 45A to the imaging lens 24.

  The detection unit 26 includes a photoelectric conversion element such as a CCD (Charge Coupled Device) image sensor that photoelectrically converts the light L imaged by the imaging lens 24.

  The electrical signal obtained by the detection unit 26 is sent to an image processing device 28 that is electrically connected to the detection unit 26. In the image processing device 28, the electrical signal is subjected to image processing, and the processed electrical signal (image signal) is sent to the exposure device 40 (see FIG. 2) via the control unit 71 (see FIG. 1). Yes.

(Configuration of the light irradiation unit 17)
Next, the configuration of the light irradiation unit 17 will be described.

  As described above, the light irradiation unit 17 includes the first carriage 18 as an example of a movable body that is movable in the sub-scanning direction (X direction in FIG. 4) along the first platen glass 43A (FIG. 4). reference). The first carriage 18 moves along the surface to be read of the original G when the original G is placed on the first platen glass 43A.

  As shown in FIG. 5, the first carriage 18 is disposed at a longitudinal end of the carriage main body 47 along the main scanning direction (Y direction in FIG. 5), and at both ends in the longitudinal direction of the carriage main body 47. And a pair of support members 49. The pair of support members 49 are arranged on a frame (not shown) provided in the casing 41 (see FIG. 3) of the image reading unit 14 along the first platen glass 43A in the sub scanning direction (X direction in FIG. 5). It is supported so as to be movable. The carriage body 47 and the pair of support members 49 are made of sheet metal, for example.

  The carriage main body 47 is disposed between a pair of side plates 55A and 55B opposed to each other with a space in the main scanning direction (Y direction in FIG. 5), and between the side plates 55A and 55B and the side plates 55A and 55B. The side wall 39, the 1st upper wall 51, and the 2nd upper wall 53 which were formed integrally are provided.

  The first upper wall 51 and the second upper wall 53 are spaced apart in the sub-scanning direction (X direction in FIG. 5) and are elongated along the main scanning direction (Y direction in FIG. 5). Is formed. Further, the first upper wall 51 and the second upper wall 53 face the second platen glass 43B when reading the image of the document G conveyed by the document conveying device 12, and the document placed on the first platen glass 43A. When reading an image of G, it faces the first platen glass 43A.

  The second upper wall 53 is bent at one end in the sub-scanning direction on the first upper wall 51 side to form an inclined surface 53A (see FIG. 4).

  The interval in the main scanning direction between the side plates 55A and 55B is larger than the width of the image forming area in the main scanning direction of the document G (see FIG. 1).

  Further, on the side wall 39 of the first carriage 18, as shown in FIG. 4, a light irradiation unit 59 that irradiates light L onto the surface to be read of the document G is provided with other components ( For example, it attaches via the bracket 57 as an example of the attachment member attached to the 1st carriage 18 so that attachment or detachment is possible independently of the below-mentioned light guide member 65). A specific mounting structure of the light irradiation unit 59 to the first carriage 18 will be described later.

  As shown in FIG. 6, the light irradiation unit 59 is an example of a circuit board 59 </ b> A extending along the main scanning direction (Y direction in FIG. 6) and a light emitting unit that emits light toward the read surface of the document G. The light emitting element 61 is provided. A plurality of the light emitting elements 61 are arranged on the circuit board 59A at regular intervals along the main scanning direction.

  As the light emitting element 61, for example, an LED (Light Emitting Diode) element is used. The circuit board 59A is supplied with power from the control unit 71 (see FIG. 1) via the flexible board 63 connected to one end in the longitudinal direction.

  Note that the plurality of light emitting elements 61 are not limited to being arranged at regular intervals, and, for example, are configured such that the intervals are narrower than the central portion in the longitudinal direction at both longitudinal ends of the circuit board 59A. Also good.

  The light emitting element 61 is not limited to the LED, and other light emitting elements such as an organic EL (Electro Luminescence) element and an inorganic EL element may be applied.

  As shown in FIG. 4, the bracket 57 is inclined with respect to the first platen glass 43 </ b> A and the second platen glass 43 </ b> B to support each light emitting element 61, and is emitted from the light emitting element 61 toward the document G. The light L is incident on the surface of the original G from an oblique direction.

  Further, as shown in FIGS. 4 and 6, a light guide member 65 that guides the light L from the light emitting element 61 to the original G is provided on the light emitting side of the light L of the light emitting element 61. It arrange | positions facing the output surface. The light guide member 65 is formed long along the main scanning direction, and both ends in the main scanning direction are supported by the side plates 55A and 55B.

  The light guide member 65 is disposed inside the first carriage 18. Specifically, it is disposed on the lower side of the first upper wall 51 and on the reflection plate 79 side described later than the side wall 39.

  The light guide member 65 is made of, for example, acrylic resin, totally reflects the light L incident from the light emitting element 61 inside, and reads the light L from the light emitting element 61 on the original G (see FIG. 1). It leads to close to the position.

  The light guide member 65 totally reflects the light L inside as described above, so that the light L from the light emitting element 61 is emitted from the light emitting surface 65 </ b> A opposite to the surface facing the light emitting element 61. Thus, at least the variation in the light amount distribution in the main scanning direction on the light exit surface 65A is suppressed.

  In addition, since the light guide member 65 guides the light L incident from the light irradiation unit 59 to the vicinity of the reading position, the light guide member 65 is preferably formed of a material in which the light amount is difficult to attenuate. Other materials for the light guide member 65 include polycarbonate resin, polyimide resin, and glass.

  A diffusion plate 67 for diffusing the light L emitted from the light guide member 65 is joined to the light emission surface 65 </ b> A of the light guide member 65. The diffusion plate 67 is made of, for example, an acrylic resin, and the light L emission surface of the diffusion plate 67 has unevenness (diffraction pattern) that diffuses the light L incident from the light emission surface 65 </ b> A of the light guide member 65. It is formed along the main scanning direction. By changing the shape of the diffraction pattern, the light L emitted from the diffusion plate 67 is shaped into a circle or an ellipse. Other materials for the diffusion plate 67 include polycarbonate resin, polyester resin, and glass.

  On the other hand, a reflecting plate 79 that reflects a part of the light L emitted from the diffusing plate 67 to the original G (see FIG. 1) is disposed at a position away from the diffusing plate 67 in the sub-scanning direction. The reflection plate 79 is a mirror body extending along the main scanning direction, and the surface opposite to the light L reflection surface is fixed to the inclined surface 53A of the second upper wall 53 (see FIG. 4).

  A first mirror 75 that guides the light L reflected by the document G to the second mirror 45 </ b> A (see FIG. 3) of the second carriage 22 is provided below the light guide member 65 and the diffusion plate 67. . Both ends of the first mirror 75 are held by holes formed in the side plates 55A and 55B (see FIG. 4).

  In addition, the light irradiation unit 17 is not restricted to said structure, You may be comprised with shapes and components other than the above.

  Next, an image reading operation for reading an image of the document G in the image reading apparatus 11 according to the present embodiment will be described.

  In the image reading device 11, when reading the image of the document G placed on the first platen glass 43 </ b> A, as shown in FIG. 3, the first carriage 18 of the light irradiation unit 17 and the second of the light guide unit 19. The carriage 22 moves in the moving direction (arrow X direction) at a moving distance ratio of 2: 1, for example.

  At this time, the light L is irradiated from the light irradiation unit 59 of the light irradiation unit 17 onto the read surface of the original G. Specifically, as shown in FIG. 4, light L is emitted from each light emitting element 61 of the light irradiation unit 59, and the emitted light L travels while totally reflecting inside the light guide member 65, and is diffused. Diffused by the plate 67. A part of the light L diffused by the diffusion plate 67 is irradiated to the original G through the second platen glass 43B, and the light L diffused to the reflection plate 79 among the light L diffused by the diffusion plate 67 is reflected. After being reflected by the plate 79, the original G is irradiated through the second platen glass 43B. As described above, in the light irradiation unit 17, the light L is irradiated to the original G from one side (the right side in FIG. 4) and the other side (the left side in FIG. 4) in the sub-scanning direction.

  The light L irradiated to the original G is reflected by the surface to be read of the original G, then reflected by the first mirror 75, the second mirror 45A, and the third mirror 45B in this order and guided to the imaging lens 24. The light L guided to the imaging lens 24 is imaged on the light receiving surface of the detection unit 26.

  In addition, since the moving distance of the second carriage 22 is half of the moving distance of the first carriage 18, the optical path length of the light L from the surface to be read of the document G to the detecting unit 26 is not changed. Yes.

  The detection unit 26 is a one-dimensional sensor, and simultaneously processes one line of the original G in the main scanning direction that intersects the sub-scanning direction (the moving direction of the first carriage 18). In the image reading unit 14, after reading one line in the main scanning direction, the first carriage 18 is moved in the sub scanning direction to read the next line of the document G. By executing this over the entire document G, reading of one page is completed.

  On the other hand, when reading the image of the document G conveyed by the document conveying device 12, as shown in FIG. 3, the first carriage 18 and the second carriage 22 are connected to one end of the image reading unit 14 (in FIG. 3). It is positioned in a state where it is stopped at the solid line reading position shown at the left end.

  At this reading position, first, the light L reflected by the first line of the conveyed original G is imaged by the imaging lens 24, and the image is detected by the detection unit 26. That is, after one line in the main scanning direction is simultaneously processed by the detection unit 26 that is a one-dimensional sensor, the next line in the main scanning direction of the document G being conveyed is read. Then, when the rear end of the document G passes through the reading position of the second platen glass 43B, the reading of one page of the document G is completed in the sub-scanning direction.

(Attachment structure of the light irradiation part 59 to the first carriage 18)
Next, a structure for attaching the light irradiation unit 59 to the first carriage 18 will be described.

  As shown in FIG. 4, the bracket 57 for detachably attaching the light irradiation unit 59 to the side wall 39 of the first carriage 18 has a partially reverse letter-shaped section in the main scanning direction. It is formed from a sheet metal that is a plate body.

  Specifically, the bracket 57 includes a support plate 85 that supports the light irradiation unit 59, and a mounting plate 86 that is integrally formed with the support plate 85 and attached to the side wall 39 of the first carriage 18. Yes.

  As shown in FIG. 7, the support plate 85 is formed with a plurality of (four in this embodiment) screw holes 82 arranged along the longitudinal direction. A plurality (four in this embodiment) of through-holes 83 are formed in the circuit board 59 </ b> A of the light irradiation unit 59 corresponding to the screw holes 82. As shown in FIG. 8, the bolt 84 inserted through the through hole 83 is screwed into the screw hole 82, whereby the circuit board 59 </ b> A of the light irradiation unit 59 is fixed to the support plate 85.

  The mounting plate 86 is a mounting plate 86A disposed on one end side in the longitudinal direction of the support plate 85 (upper right side in FIG. 9) and an mounting plate disposed on the other end side in the longitudinal direction of the support plate 85 (lower left side in FIG. 9). And a plate 86B.

  The attachment plates 86A and 86B are respectively formed with claw portions 92 as an example of a restricting means for restricting the bracket 57 from moving toward another component (for example, the light guide member 65) when the bracket 57 is attached or detached. Has been.

  The claw portions 92 formed on the mounting plates 86 </ b> A and 86 </ b> B are respectively arranged on the center side in the longitudinal direction of the bracket 57. That is, the claw portions 92 formed on the mounting plates 86A and 86B are formed on the mounting plate 86B side of the mounting plate 86A and the mounting plate 86A side of the mounting plate 86B.

  The claw portions 92 protrude upward from the lower end portions of the attachment plates 86A and 86B, respectively, and the side wall 39 of the first carriage 18 extends from the tip portion of the claw portion 92 to the two claw portions 92 and the attachment plate 86A, 86B is inserted between them.

  The side wall 39 inserted between the two claw portions 92 and the mounting plates 86 </ b> A and 86 </ b> B hits the base end portion of the claw portion 92, and further insertion is restricted.

  The side wall 39 inserted between the two claw portions 92 and the mounting plates 86A and 86B is sandwiched between the two claw portions 92 and the mounting plates 86A and 86B, and the thickness of the mounting plates 86A and 86B of the bracket 57 is reached. Movement in the direction (movement toward the light guide member 65 in FIG. 4) is restricted.

  In the state where the side wall 39 is inserted between the two claw portions 92 and the mounting plates 86A and 86B, the movement of the bracket 57 along the longitudinal direction of the side wall 39 is allowed.

  Further, the mounting plates 86A and 86B are each formed with a convex portion 91 as an example of a held portion at the center in the longitudinal direction of the mounting plates 86A and 86B.

  On the side wall 39 of the first carriage 18, a notch portion 95 as an example of a holding portion that holds the convex portion 91 is formed. The notch 95 has an open end formed at the lower end of the side wall 39 and is bent to one side in the longitudinal direction of the side wall 39 (lower left side in FIG. 9). As a result, the notch 95 has the protrusion 91 that has entered the notch 95 from the lower end of the side wall 39 in the longitudinal direction of the side wall 39 so that the bracket 57 moves in the main scanning direction that is not regulated by the claw 92. It guides to the back side of the notch 95 which is the side (lower left side in FIG. 9). The convex portion 91 guided to the back side of the notch 95 is sandwiched from the upper and lower sides by the inner wall of the notch 95 on the back side of the notch 95, and the movement of the side wall 39 to one side in the longitudinal direction is restricted. Is supposed to be retained. Thereby, the bracket 57 is positioned with respect to the side wall 39.

  The holding portion is not limited to the cutout portion 95, and may be, for example, a groove portion or a long hole, and may have a configuration other than the cutout portion 95 as long as it holds the held portion. Moreover, as a to-be-held part, it is not restricted to the convex part 91, As long as it is hold | maintained at a holding part, structures other than the convex part 91 may be sufficient. Alternatively, the cutout portion 95 may be formed in the bracket 57 as a held portion, and the convex portion 91 may be formed in the side wall 39 as a holding portion.

  A through hole 93 into which a bolt 87 is inserted is formed in the side wall 39 of the first carriage 18.

  In the mounting plates 86A and 86B, corresponding to the through holes 93, screw holes 89 are formed on the end side in the longitudinal direction of the bracket 57 (on the opposite side to the claw portion 92 with the convex portion 91 interposed). In a state where the convex portion 91 is held by the notch portion 95, the screw hole 89 and the through hole 93 overlap each other. Thereby, in a state where the convex portion 91 is held in the notch portion 95, the bolts 87 inserted through the through holes 93 are screwed into the screw holes 89, whereby the mounting plates 86 </ b> A and 86 </ b> B are fixed to the side wall 39. .

  On the other hand, the support plate 85 is inclined with respect to the attachment plate 86, and the light emitting elements 61 are inclined with respect to the read surface of the original G by attaching the attachment plate 86 to the side wall 39. The

  A support portion 97 that supports the vibration suppressing member 96 for contacting the first mirror 75 and suppressing the vibration of the first mirror 75 is formed at the center in the longitudinal direction of the support plate 85. The support portion 97 is formed integrally with the support plate 85, and is attached to and detached from the side wall 39 integrally with the bracket 57. As the vibration suppressing member 96, for example, a porous member such as sponge or an elastic member such as rubber is used.

  In addition, the bracket 57 is not restricted to said structure, You may be comprised by shapes and arrangements other than the above. Further, the restricting means is not limited to the claw portion 92 formed on the bracket 57, but may be a member formed on the side wall 39 side, or may be configured by a shape or arrangement other than the claw portion 92.

  Next, an attaching operation for attaching the bracket 57 to the side wall 39 of the first carriage 18 will be described.

  First, as shown in FIG. 10, the bracket 57 detached from the first carriage 18 is moved upward from the lower end of the side wall 39 of the first carriage 18, and as shown in FIG. Is inserted into the notch 95, and the side wall 39 is inserted between the mounting plates 86A and 86B and the two claw portions 92 (see FIG. 4).

  When the convex portion 91 is inserted into the notch portion 95, as shown in FIG. 11, the convex portion 91 hits the inner wall of the notch portion 95 on the back side in the insertion direction of the convex portion 91 (upper side in FIG. 11). Movement in the insertion direction (upward) is restricted. Further, when the side wall 39 is inserted between the mounting plates 86A, 86B and the two claw portions 92, the lower end of the side wall 39 abuts on the base end portion of the claw portion 92 as shown in FIG. Movement in the insertion direction (upward) is restricted.

  In the state where the side wall 39 is inserted between the mounting plates 86A and 86B and the two claw portions 92, the movement of the bracket 57 along the thickness direction of the mounting plate 86 (side wall 39) is prevented, while the mounting plate Movement along the longitudinal direction of 86 (side wall 39) is allowed.

  Next, the first carriage 18 is moved to one side in the longitudinal direction of the side wall 39 (left side in FIG. 12). By this movement, the convex portion 91 is guided to the back side of the notch portion 95, and the convex portion 91 is held on the back side of the notch portion 95. In a state where the convex portion 91 is held by the notch portion 95, the through hole 93 and the screw hole 89 overlap, and the bolts 87 inserted through the through hole 93 are screwed into the screw hole 89, whereby the mounting plates 86A and 86B are It is fixed to the side wall 39.

  In this way, when the bracket 57 is attached to the side wall 39 of the first carriage 18, the movement of the bracket 57 along the thickness direction of the attachment plate 86 (side wall 39) is restricted, as shown in FIG. When viewed from the side wall 39, the light emitting element 61 is prevented from coming into contact with other components (for example, the light guide member 65) on the side of the side wall 39 in the thickness direction.

  Further, as described above, the image reading apparatus 11 according to the present embodiment comes into contact with the first mirror 75 as an example of an optical member for guiding the reflected light reflected by the original G to the detection unit 26 and vibrates the vibration. A vibration suppressing member 96 for suppressing the vibration suppressing member 96 and a support portion 97 for supporting the vibration suppressing member 96 are provided.

  According to this configuration, since the vibration suppressing member 96 can be removed by removing the bracket 57 when the first mirror 75 is attached, the vibration suppressing member 96 does not get in the way and the first mirror 75 can be attached. It becomes easy.

  The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made.

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 11 Image reading apparatus 18 1st carriage (an example of a moving body)
21 Image Recording Device 26 Detection Unit 57 Bracket (Example of Mounting Member)
61 Light Emitting Element (Example of Light Emitting Unit)
65 Light guide member (an example of other parts)
91 convex part (an example of a held part)
92 Claw part (an example of regulating means)
95 Notch (an example of a holding part)

Claims (4)

A movable body movable along the surface to be read;
A light emitting unit that emits light toward the read surface;
A detection unit for detecting reflected light emitted from the light emitting unit and reflected by the surface to be read;
An attachment member that is fixed to the light emitting unit and is detachably attached to the moving body independently of a light guide member attached to the moving body;
When attaching and detaching the attachment member to and from the moving body, restricting means for restricting the attachment member from moving to the light guide member side;
With
The light guide member is disposed obliquely above the light emitting unit, guides light from the light emitting unit to the read surface,
The restricting means prevents the lateral movement of the mounting member by sandwiching the side wall of the moving body between the mounting member and prevents the upward movement of the mounting member by hitting the lower end of the side wall. An image reading device that restricts the obliquely upward movement of the light emitting unit and allows the attachment member to move along the side wall . The attachment member is formed of a plate,
The restricting means has a claw portion protruding from the plate body along the plate body,
The image reading apparatus according to claim 1, wherein the claw portion prevents movement of the attachment member with respect to the moving body along a thickness direction of the plate body. A held portion formed on the mounting member;
A holding portion that is formed on the movable body and guides the held portion so that the attachment member moves in a direction not regulated by the regulating means, and holds the held portion;
The image reading apparatus according to claim 1, further comprising: The image reading apparatus according to any one of claims 1 to 3,
An image recording apparatus for recording an image on a recording medium based on an image read by the image reading apparatus;
An image forming apparatus comprising:

Images