JP2010078705A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus for suppressing the intrusion of dirt or dust from a dust-proof member pull-out port. <P>SOLUTION: A lid member 38 is fixed to the outer surface of a front-side side plate 67 as a part of the image forming apparatus with a screw 391 as a fixing member. The lid member 38 blocks a pull-out port 67a as the dust-proof member pull-out port that is disposed in the front-side side plate 67 and used for pulling out dust-proof glass 35. By blocking the pull-out port 67a by the lid member 38, the intrusion of dirt, dust or the like from the pull-out port 67a into a write-in area 69 can be suppressed, and the adhesion of dirt or dust to the dust-proof glass 35 can be suppressed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  2. Description of the Related Art Conventionally, image forming apparatuses such as printers, copiers, facsimiles, and multifunction devices having these combined functions irradiate an image carrier (for example, a photosensitive member) with a light beam emitted from a light source to write a latent image. An optical scanning device is provided. In such an image forming apparatus, the latent image formed on the image carrier is developed to be a visible image, and then the visible image is directly transferred from the image carrier or via an intermediate transfer member to the transfer material. After the transfer, the visible image on the transfer material is fixed to obtain an image. In addition, as a color image forming apparatus, the latent image formed on each image carrier is developed and visualized, and then a transfer material such as recording paper carried on a transfer conveyance belt or the like is carried on each image carrier. It is transported to the body transfer section. There is an image obtained by superimposing and transferring a visible image of each color formed on each image carrier on a transfer material, and fixing the visible image transferred on the transfer material to obtain an image.

  The optical scanning device includes a light source and a polygon scanner which is a deflection scanning unit including a polygon mirror and a polygon motor. In addition, an fθ lens is provided as a scanning lens that corrects the writing light deflected and scanned at a constant angular velocity by the polygon mirror so as to scan the latent image carrier at a constant velocity. Furthermore, a reflection mirror is provided on the optical path from the fθ lens to the latent image carrier.

  The writing light emitted from the light source is deflected and scanned at a constant angular velocity by a rotating polygon mirror. The writing light deflected and scanned at a constant angular velocity enters the fθ lens, is condensed in the main scanning line direction, and is corrected to scan at a constant speed on the latent image carrier. The writing light corrected so as to scan at an equal speed by the fθ lens is folded by the reflecting mirror and irradiated onto the latent image carrier.

  The above-described components included in the optical scanning device are attached to a single casing and hermetically sealed so that dust and dirt do not adhere to a reflection mirror or the like. The housing is provided with an exit port so that writing light emitted from the light source in the housing is irradiated to the photoconductor, and the exit port is closed with a dust-proof glass which is a light-transmitting dust-proof member. Yes.

  In the image forming apparatus, various dusts such as dust and dust are generated in the toner and the image forming process, and these adhere to the dust-proof glass. As dust and dust adhere to the dust-proof glass, abnormal images such as white stripes / black stripes, a decrease in image density, and uneven image density are generated due to the influence of the dust and dust. For this reason, it is necessary to periodically clean the dustproof glass by a service person or a user. Removing the optical scanning device from the main body of the image forming apparatus and cleaning the dust proof glass takes time and effort to remove the heavy and large optical scanning device from the image forming apparatus, which makes the dust proof glass cleaning work complicated. There is a problem of end.

  Patent Document 1 describes an image forming apparatus in which only dust-proof glass can be pulled out from an image forming apparatus main body. In order to take out only the dustproof glass from the apparatus main body, the dustproof glass is accessed from the dustproof member outlet provided on the side plate of the apparatus main body, and only the dustproof glass is pulled out. Thereby, only the dust-proof glass can be taken out from the apparatus main body, and the dust-proof glass can be easily cleaned.

JP 2004-271551 A

  However, in the image forming apparatus described in Patent Document 1, dust or dust enters from the dustproof member outlet provided in the vicinity of the dustproof glass, and dust or dust that has entered from the dustproof member outlet adheres to the dustproof glass. As a result, there was a problem that the dust-proof glass gets dirty early.

  The present invention has been made in view of the above problems, and an object thereof is to provide an image forming apparatus capable of suppressing dust and dust from entering from a dustproof member outlet.

In order to achieve the above object, the invention of claim 1 comprises an image carrier, a light source, deflection scanning means for deflecting and scanning light generated by the light source in the main scanning direction with respect to the surface of the image carrier, and A housing housing optical system components arranged on the optical path of light from the deflection scanning means to the surface of the image carrier, and a light irradiation port of the housing so as to block the dust. An image forming apparatus comprising: an optical scanning unit including a dust-proof member that prevents entry from the irradiation port into the housing and forms an optical path; and the dust-proof member is configured to be freely drawn out of the apparatus from the dust-proof member outlet. In the apparatus, a lid member for closing the dustproof member outlet is provided.
According to a second aspect of the present invention, in the image forming apparatus of the first aspect, the lid member is provided with a drawing means for pulling out the dustproof member from the dustproof member outlet.
According to a third aspect of the present invention, in the image forming apparatus according to the second aspect, an engaged portion is provided on the dust-proof member, and an engaging portion that engages with the engaged portion is provided on the drawing means. It is a feature.
According to a fourth aspect of the present invention, in the image forming apparatus according to the second or third aspect, when the dustproof member outlet is closed by the lid member, the drawer means pulls out the dustproof member. It is configured to function as a restricting means for restricting movement in the direction.
According to a fifth aspect of the present invention, in the image forming apparatus according to any one of the second to fourth aspects, the optical scanning device is configured to be capable of being pulled out of the device, and a direction in which the optical scanning device is pulled out is determined by the dustproof member. It is characterized in that the direction is orthogonal to the pulling direction.
According to a sixth aspect of the present invention, in the image forming apparatus according to any of the second to fifth aspects, the lid member is provided with a handle.

  According to the present invention, since the lid member that closes the dustproof member outlet is provided, it is possible to prevent dust and dust from entering from the dustproof member outlet. Thereby, it can suppress that the dust and dust which penetrate | invaded from the dust-proof member outlet to the dust-proof member can be suppressed, and the dirt of a dust-proof member can be suppressed. Thereby, the space | interval of the dustproof glass cleaning which a service person or a user performs regularly can be extended.

Hereinafter, an embodiment in which the present invention is applied to an image forming apparatus will be described. First, the configuration and operation of the image forming apparatus according to the present embodiment will be described.
FIG. 1 is an overall schematic configuration diagram of an image forming apparatus (hereinafter referred to as a printer 500) according to the present embodiment. The printer 500 is a tandem intermediate transfer type electrophotographic apparatus, and includes a main body 100 and a paper feed table on which the main body 100 is placed. Note that subscripts Y, M, C, and K in the drawing indicate yellow, cyan, magenta, and black (black), respectively.

  The main body 100 includes an endless belt-shaped intermediate transfer belt 99 near the center. The intermediate transfer belt 99 is wound around a plurality of support rollers and can be rotated and conveyed clockwise in FIG. In FIG. 1, a cleaning device 17 for the intermediate transfer belt is provided on the left side of the support roller 19. The cleaning device 17 removes residual toner remaining on the intermediate transfer belt 99 after image transfer.

  On the intermediate transfer belt 99 stretched between the support roller 14 and the support roller 15, four image forming units 18Y, 18M, and 18C as yellow, cyan, magenta, and black image forming units are arranged along the conveyance direction. , 18K (hereinafter abbreviated as 18Y, M, C, K) are arranged side by side to constitute the tandem image forming unit 20. On the tandem image forming unit 20, a first writing device 55a and a second writing device 55b are arranged side by side as shown in FIG. The first writing device 55a, which is an optical scanning device, forms a latent image by irradiating the Y-color photoconductor 40Y and the M-color photoconductor 40M with scanning light beams. On the other hand, the second writing device 55b, which is an optical scanning device, forms a latent image by irradiating the C-color photoconductor 40C and the K-color photoconductor 40K with scanning light beams.

Each image forming unit 18 of the tandem image forming unit 20 includes drum-shaped photoconductors 40Y, 40M, 40C, and 40K as image carriers that carry toner images of yellow, cyan, magenta, and black. Further, each image forming unit 18 is formed around the photoreceptors 40Y, M, C, K on the photoreceptors 40Y, M, C, K by the charging devices 43Y, M, C, K, and the writing device 55. Developing devices 41Y, 41M, 41C, and 42K that develop the latent image, and a photoconductor cleaning device 42Y that cleans the surfaces of the photoconductors 40Y, 40M, 40C, and 40K after the image is transferred onto the intermediate transfer belt 99. M, C, K, etc. are provided.
Further, at the primary transfer position where the toner image is transferred from the photoconductors 40Y, M, C, K to the intermediate transfer belt 99, the photoconductors 40Y, M, C, K are opposed to each other with the intermediate transfer belt 99 interposed therebetween. As described above, primary transfer rollers 62Y, 62M, 62C, and 62K are provided as components of the primary transfer unit. The support roller 14 is a drive roller that rotationally drives the intermediate transfer belt. When a black monochrome image is formed on the intermediate transfer belt 99, the support rollers 15 and 15 ′, which are not driving rollers, are moved to separate the yellow, cyan, and magenta photoreceptors 40Y, M, and C from the intermediate transfer belt. It is also possible.

  The main body 100 includes a secondary transfer device 22 on the side opposite to the tandem image forming unit 20 with the intermediate transfer belt 99 interposed therebetween. In the example shown in FIG. 1, the secondary transfer device 22 forms a secondary transfer portion by pressing the secondary transfer roller 16 ′ against the secondary transfer counter roller 16, and the secondary transfer counter roller 16 and the secondary transfer roller 16 are secondary-transferred. By applying a transfer electric field to the roller 16 ', the image on the intermediate transfer belt 99 is transferred to a sheet S as transfer paper. Further, the main body 100 is provided with a fixing device 25 that fixes the transferred image on the sheet S beside the secondary transfer device 22 (left side in FIG. 1). Further, between the secondary transfer device 22 and the fixing device 25, a conveyance belt 24 that conveys the sheet S, on which the image on the intermediate transfer belt 99 has been transferred by the secondary transfer device 22, to the fixing device 25 is provided. Yes. The fixing device 25 is configured by pressing a pressure roller 27 against a fixing belt 26 that is an endless belt. The sheet S after the image transfer is conveyed to the fixing device 25 by the conveyance belt 24. In the example shown in FIG. 1, sheet reversal is performed under the secondary transfer device 22 and the fixing device 25 so as to invert the sheet S so as to record images on both sides of the sheet S in parallel with the tandem image forming unit 20 described above. A device 28 is provided.

  When image data is sent to the printer 100 and an image forming start signal is received, the support roller 14 is driven to rotate by a drive motor (not shown), and the other plurality of support rollers are driven to rotate the intermediate transfer belt 99. Move endlessly. At the same time, latent images corresponding to yellow, cyan, magenta, and black are written on the respective photoreceptors 40 by the individual image forming units 18 by the writing device 55, and each developing device 41 included in each image forming unit 18 is provided. By developing the latent image, a single color image of yellow, cyan, magenta, and black is formed on each photoconductor 40, respectively. Then, along with the endless movement of the intermediate transfer belt 99, those single-color images are sequentially transferred to the intermediate transfer belt 99 at the primary transfer portion that is the opposing portion of each photoconductor 40 and each primary transfer roller 62, To form a color image.

In addition, one of the paper feed rollers 42 of the paper feed table 200 is selectively rotated to feed out the sheet S from one of the paper feed cassettes 44 provided in the paper bank 43 in multiple stages, and separated and fed one by one by the separation roller 45. The paper is put into the paper path 46, transported by the transport roller 47, guided to the main body side paper feed path 48 in the copying machine main body 100, and abutted against the registration roller 49 and stopped. Alternatively, the manual feed roller 50 is rotated to feed out the sheets S on the manual feed tray 51, separated one by one by the manual feed separation roller 52, put into the manual feed path 53, and abutted against the registration roller 49 and stopped. Then, the registration roller 49 is rotated in synchronization with the color image on the intermediate transfer belt 99, and the sheet S is fed between the secondary transfer roller 16 ′ of the secondary transfer device 22 and the intermediate transfer belt 99, and the intermediate transfer is performed. The color image on the belt 99 is transferred onto the sheet S by the secondary transfer device 22 and the color image is recorded on the sheet S. The sheet S after the image transfer is transported by the transport belt 24 and sent to the fixing device 25, and heat and pressure are applied to the fixing device 25 to fix the color image on the sheet S. The sheet is discharged outside and stacked on the sheet discharge tray 57.
When performing double-sided printing, the sheet S that has been switched by a switching claw (not shown) and passed through the fixing device 25 is placed in the sheet reversing device 28, where it is reversed and guided again to the transfer position, and an image is recorded on the back surface. After that, the paper is discharged onto a paper discharge tray 57 by a discharge roller 56. On the other hand, the residual toner remaining on the surface of the intermediate transfer belt 99 after the image transfer is removed by the belt cleaning device 17 in preparation for image formation by the tandem image forming unit 20 again.

Next, the writing device will be described. Since the first writing device 55a and the second writing device 55b have the same configuration, in the following description, the first writing device 55a will be described.
2 is a plan view of the first writing device 55a as viewed from above, and FIG. 3 is a cross-sectional view of the first writing device 55a as viewed from the side.
As shown in FIG. 2, the first writing device 55a irradiates the Y-color photoconductor 40Y and the M-color photoconductor 40M with the scanning light beam SL as shown in FIG. With respect to the symmetry line drawn in the direction orthogonal to the axial direction of the rotation axis of the polygon mirror 9 through the center, the Y-color optical system and the M-color optical system are arranged in a line-symmetrical position to form a pair. This is an opposed scanning type optical scanning device.
The first writing device 55a includes a Y-color LD unit 3Y for irradiating the photoconductor 40Y with the scanning light beam SLY and an M-color LD unit 3M for irradiating the photoconductor 40M with the scan light beam SLM. Have. Each LD unit 3Y, 3M which is a light source unit houses a plurality of LDs (laser diodes) which are light sources and a plurality of collimator lenses in a container.

In the LD unit 3Y, the first LD 1aY and the second LD 1bY in the plane direction are two sets in the height direction (front-back direction in FIG. 2), and a total of four LDs are accommodated in the container. Further, the container includes a first collimator lens 2aY corresponding to the first LD 1aY and a first collimator lens 2bY corresponding to the second LD 1bY.
The light beams emitted from the first LD 1aY and the second LD 1bY as the light source pass through the first collimator lens 2aY and the second collimator lens 2bY, respectively, and are emitted from the LD unit 3Y as the first principal ray 4aY and the second principal ray 4bY. To do.

The LD unit 3M has the same configuration as the LD unit 3Y. That is, the first LD 1aM and the second LD 1bM in the plane direction are two sets in the height direction (front-back direction in FIG. 2), a total of four LDs, the first collimator lens 2aM corresponding to the first LD 1aM, The first collimator lens 2bM corresponding to the second LD1bM is housed in the container.
The light beams emitted from the first LD 1aM and the second LD 1bM pass through the first collimator lens 2aM and the second collimator lens 2bM, respectively, and are emitted from the LD unit 3M as the first principal ray 4aM and the second principal ray 4bM.

  The first principal ray 4aY and the second principal ray 4bY emitted from the LD unit 3Y pass through the aperture 5Y and pass through the cylindrical lens 6Y. Then, the light is reflected by the folding mirror 7Y, which is a reflecting mirror, and enters the polygon mirror 9. Similarly, the first principal ray 4aM and the second principal ray 4bM emitted from the LD unit 3M also pass through the aperture 5M and pass through the cylindrical lens 6M. Then, the light is reflected by the folding mirror 7M and enters the polygon mirror 9.

The polygon mirror 9 is rotationally driven by a polygon motor 10, and the first principal ray 4aY and the second principal ray 4bY that contribute to the formation of the Y-color image are incident on the rotating polygon mirror 9 and reflected, so that the It becomes a scanning beam SLY and a synchronization beam BDLY. In the first writing device 55a, the front-back direction of the paper surface in FIG. 3 is the height direction, and the first LD 1aY and the second LD 1bY are arranged at the same height. The first principal ray 4aY and the second principal ray 4bY travel on the same optical path until they enter the polygon mirror 9.
The scanning light beam SLY is transmitted through the first Fθ lens 12aY and the second Fθ lens 12bY, is then folded by the upper mirror 31Y and the lower mirror 32Y, is transmitted through the lower third Fθ lens 12cY, and is transmitted by the second lower mirror 33Y. reflect. The scanning light beam SLY reflected by the second lower mirror 33Y is provided so as to block the Y light irradiation port of the housing 71 of the first writing device 55a, and dust enters the housing 71 from the light irradiation port. The light is emitted from the dust-proof glass 35Y that prevents the light toward the photoconductor 40Y. The scanning light beam SLY emitted from the first writing device 55a reaches the surface of the photoconductor 40Y that is the surface to be scanned and forms a latent image corresponding to the Y color.
Further, when the sync beam BDLY is detected by the tip synchronization detection plate 11aY, a sync signal is output, and a light source signal converted based on the input Y color image data is input to the first LD 1aY and the second LD 1bY. Emits light. Further, when the synchronization light beam BDLY is detected by the rear end synchronization detection plate 11bY, the light emission of the first LD 1aY and the second LD 1bY is stopped.

Similarly, the first principal ray 4aM and the second principal ray 4bM contributing to the M color image formation are the polygon mirror 9 and become the M color scanning ray SLM and the synchronization ray BDLM. The scanning light beam SLM is emitted from the dust-proof glass 35M toward the photoreceptor 40M through the first Fθ lens 12aM, the upper mirror 31M, the lower mirror 32YM, the second Fθ lens 12bY, and the second lower mirror 33Y. As a result, a latent image corresponding to the M color is formed on the photoconductor 40M. When the synchronization light beam BDLY is detected by the tip synchronization detection plate 11aY, a synchronization signal is output, and a light source signal converted based on the input Y color image data is input to the first LD 1aY and the second LD 1bY to emit light. . Further, when the synchronization light beam BDLY is detected by the rear end synchronization detection plate 11bY, the light emission of the first LD 1aY and the second LD 1bY is stopped.
Here, the folding mirrors 7Y and 7M are fixed to the casing 71 by leaf springs 8Y and 8M which are fixing members.

Next, features of the present embodiment will be described.
Various dusts such as dust and dust are generated in the toner and the image forming process, and these adhere to the dust-proof glass. When dust or dust adheres to the dust-proof glass, abnormal images such as white stripes / black stripes, a decrease in image density, and uneven image density occur due to the influence of the dust and dust. For this reason, it is necessary to periodically clean the dustproof glass. Therefore, in this printer, only the dustproof glasses 35Y, M, C, and K provided in the writing devices 55a and 55b are taken out from the apparatus main body. Since the configuration for drawing out each dustproof glass 35Y, 35M, 35C, and 35K from the apparatus main body is the same, the color code (Y, M, C, K) will be omitted here.

  FIG. 4 is a schematic perspective view showing the configuration around the dust-proof glass 35, and FIG. 5 is a right side view of the writing device 55. 6 is a cross-sectional view taken along the line AA in FIG. 5, and FIG. 7 is a cross-sectional view taken along the line BB in FIG. 8 is a cross-sectional view taken along the line CC in FIG. 7, and FIG. 9 is a cross-sectional view taken along the line DD in FIG. FIG. 10 is a view showing a structure around the outlet 67 a of the front side plate 67.

  As shown in FIGS. 5 and 8, the copying machine main body includes a writing area 69 in which the first and second writing devices 55a and 55b are arranged, and image forming units 18Y, 18M, 18C, and 18K. A partition plate 68 that partitions the image forming area is provided. A through hole 68a is provided in a portion of the partition plate 68 that faces each dustproof glass 35, and is configured to allow scanning light beams to pass therethrough. In this way, the partition area 68 separates the writing area 69 from the image forming area, so that fine powder and dust such as toner and carrier floating in the image forming area enter the writing area 69. Can be suppressed. Thereby, it can suppress that dust, dust, etc. adhere to dustproof glass 35.

  The front side (left side in FIG. 8) end of the dust-proof glass 35 protrudes from the casing 71, and the engaged member 37 is attached to this protruding part. The engaged member 37 is provided with an engagement hole 37a. The engaged member 37 is made of resin and is fixed to the dust-proof glass 35. The engaged member 37 is fixed to the dust-proof glass 35 using an adhesive, a double-sided tape, or a photo-curing resin.

  The dust-proof glass 35 is slidably supported by the guide member 36 toward the front side of the apparatus. As shown in FIG. 9, the guide member 36 has a support portion 36 c that slidably supports the dust-proof glass 35 at the center, and a fixing portion 36 d that is fixed to the lower surface of the housing 71 at both ends. In the central part of the support part, a passage opening 36a is formed through which scanning light passes. The length of the passage port 36 a in the sub-scanning direction is larger than the light irradiation port 71 a of the housing 71. Thereby, it is possible to prevent the scanning light beam from being blocked by the guide member 36. As shown in FIG. 7, the fixing portions 36 d provided at both ends are provided with two screw holes, and screws 39 as fixing members are inserted into the screw holes, respectively. Screwed.

  As shown by the dotted line in FIG. 10, the front side plate 67 that is a part of the image forming apparatus is provided with a draw-out port 67 a that is a dust-proof member draw-out port for drawing out the dust-proof glass 35. The lid member 38 is fixed to the outer surface of the front side plate 67 by screws 391 that are fixing members, and the lid member 38 closes the outlet 67a. By closing the outlet 67 a with the lid member 38, it is possible to suppress dust and dust from entering the writing area 69 from the outlet 67 a and to prevent dust and dust from adhering to the dust-proof glass 35. .

  Further, as shown in FIG. 8 and the like, a drawer member 38 a serving as a drawer means is provided on the inner surface (the outlet facing surface) of the lid member 38. The drawing member 38a has an engaging portion 38b that extends toward the dust-proof glass and has its tip end bent upward in the vertical direction. The drawing member 38 a is below the dust-proof glass 35, and the engaging portion 38 a is engaged with the engaging hole 37 a of the engaged member 37 from below.

  By providing the pull-out member 38a for pulling out the dust-proof glass 35 on the lid member 38, the dust-proof glass 35 can be pulled out without a serviceman or a user preparing a jig for pulling out the dust-proof glass 35 separately. it can.

  As shown by an arrow 72 in FIG. 5, the writing device 55 is supported so as to be freely drawn out by a slide member (not shown) upward in the vertical direction, which is a direction orthogonal to the drawing direction of the dustproof glass 35 indicated by the arrow 80. As described above, the drawing member 38 a is below the dust-proof glass 35, and the engaging portion 38 b is engaged with the engaging hole 37 a of the engaged member 37 from below. The dust-proof glass 35 is located inside the front side plate 67. Therefore, when the writing device 55 is pulled out in the vertical direction, the drawing member 38a and the like can be pulled out without interfering with the drawing.

  When the writing device 55 is configured to be pulled out in the same direction as the dustproof glass pulling direction, the engaging portion 38b of the pulling member 38a is connected to the rear end surface of the engaging hole 37a of the engaged member 37 as shown in FIG. It abuts against 37c 'or the front side end face 37c. Therefore, the writing device 55 cannot be pulled out from the apparatus main body unless the lid member 38 is removed and the engagement between the engaging portion 38b of the drawing member 38a and the engaged member 37 is released. On the other hand, by configuring the writing device 55 so that it can be pulled out in a direction perpendicular to the direction in which the dust-proof glass 35 is pulled out, the engaging portion 38b of the drawing member 38a does not hit the engaged member 37 when the writing device is pulled out. It becomes possible to pull out. Therefore, the writing device 55 can be pulled out without removing the lid member 38, and the drawing workability of the writing device 55 can be improved.

Further, as shown in FIG. 8, the distance from the bent portion 36b where the dust-proof glass 35 on the back side (right side in the drawing) of the guide member abuts to the outer surface 67b of the front side plate 67 is W, and the back end surface of the light irradiation port 71a. H is the distance from 71b to the outer surface 67b of the front side plate 67, Lb is the distance from the back end 35b of the dust-proof glass 35 to the back end 37c 'of the engagement hole 37a, and La is the length of the extraction member 38a. When
It is configured to satisfy the relationship of H <(Lb + La) <W.

Next, attachment / detachment of the dust-proof glass 35 will be described with reference to FIGS.
FIG. 11 is a schematic perspective view showing how the dust-proof glass 35 is pulled out, and FIG. 12 is a cross-sectional view showing how the dust-proof glass 35 is pulled out.
When a service person or user who regularly visits the maintenance of the image forming apparatus cleans the dust-proof glass 35, first, the front cover (not shown) is opened, the screw 391 is removed, and the lid member 38 is moved to the front side. Let When the lid member 38 is moved to the near side, the drawing member 38a provided on the lid member 38 is moved to the near side. Then, the engaging portion 38 b of the drawing member 38 a comes into contact with the front end surface 37 c of the engaging hole 37 a of the engaged member 37. When the lid member 38 is further moved to the near side from this state, the dust-proof glass 35 is pulled out to the near side while sliding the guide member 36. Then, as shown in FIGS. 11 and 12, the engaged member 37 is drawn out from the outlet 67 a of the front side plate 67. When the engaged member 37 is pulled out from the outlet 67a of the front side plate 67, the engaged member 37 is pinched and the dust-proof glass 35 is pulled out from the outlet 67a to the outside of the apparatus. Further, the outlet 67a is set to a minimum necessary size through which the engaged member 37 can pass.

  Thus, since the dust-proof glass 35 is pulled out from the outlet 67a by using the extraction member 38a, the extraction outlet 67a can be set to a minimum necessary size through which the engaged member 37 can pass, and the finger can be set from the extraction outlet 67a. The outlet 67a can be made smaller as compared with the case where the dust-proof glass 35 is pulled in and pulled out from the outlet. This is because the size of the finger of the person who takes out the dust-proof glass 35a varies depending on the person, and the outlet 67a must be formed according to the assumed maximum size of the finger. turn into. As a result, when the lid member 38 is removed from the apparatus main body, such as when the dust-proof glass is being cleaned, dust and dirt easily enter the writing area 69 from the outlet 67a. On the other hand, in the present copying machine, the size of the pull-out port 67a may be set to the minimum necessary size that allows the engaged member 37 to pass through, so that the dust-proof glass 35 in the writing area is accessed with a finger. The outlet 67a can be made smaller than that of the one. Thereby, when the lid member 38 is removed from the apparatus main body, it is possible to prevent dust and dirt from entering the writing area 69 from the outlet 67a.

Further, in response to a request for downsizing of the device, by providing a device between the writing device 55 and the front side plate 67 or reducing the size of the writing device 55, the front side plate 67 and the writing device 55 can be reduced. In some cases, the distance of Thus, if the distance between the front side plate 67 and the writing device 55 is increased, it becomes difficult to access the dust-proof glass 35 from the outlet 67a of the front side plate 67 without removing the writing device 55. In particular, if the dustproof glass 35 is separated from the outlet 67a by 50 [mm] or more, it becomes difficult to access the dustproof glass 35 from the outlet 67a.
On the other hand, in this copying machine, the engaging portion 38b of the drawing member 38a and the engaged member 37 fixed to the dust-proof glass 35 are engaged in advance. Therefore, when pulling out the dust-proof glass 35, it is not necessary to access the dust-proof glass 35 through the pull-out port 67a, and the dust-proof glass 35 can be pulled out from the pull-out port 67a simply by pulling out the lid member 38. . Therefore, even if the distance between the front side plate 67 and the writing device 55 is large, the dust-proof glass 35 can be easily pulled out from the outlet 67a.

Further, since the copying machine engages the engaging portion 38b of the drawing member 38a with the engaged member 37 and pulls out the dust-proof glass 35 from the drawing port 67a, for example, a viscous object is provided at the tip of the drawing member 38. Compared with the method of sticking a viscous object directly to the front end surface of the dust-proof glass 35 and pulling out the dust-proof glass 35 from the outlet 67a using a temporary adhesive force by the viscous object, the dust-proof glass 35 is pulled more securely. It is possible to pull out from the outlet 67a. In this case, the adhesive force between the adhesive substance and the dustproof glass varies depending on the dirt on the edge of the dustproof glass or the manner in which the adhesive substance adheres to the dustproof glass. For this reason, in the case where the adhesive strength is weak, when the dust-proof glass is pulled out, the viscous material of the drawer member peels off from the dust-proof glass, and the drawer member is accessed again to the dust-proof glass, and the adhesive substance of the drawer member adheres to the dust-proof glass. It becomes necessary to make it happen.
On the other hand, since the engaging portion of the drawer member is engaged with the engagement hole provided in the dust-proof glass and pulled out, problems such as variations in adhesive force do not occur, so the dust-proof glass is surely removed from the outlet 67a. It can be pulled out.

  After the dust-proof glass 35 is cleaned, the engaged member 37 is pinched, and the dust-proof glass 35 is pushed into the apparatus main body until the engaged member 37 slightly protrudes from the front side plate 67 as shown in FIG. 35 is temporarily attached. The engaging portion 38b of the drawing member 38a of the lid member 38 is engaged with the engaging hole 37a of the engaged member 37 of the dustproof glass 35 in the temporarily mounted state (see FIGS. 11 and 12). Then, the drawing member 38a of the lid member 38 is pushed into the drawing port 67a. Then, the engaging portion 38b of the drawing member 38a abuts against the back end surface 37c ′ of the engaging hole 37a. In this state, when the drawing member 38a of the lid member 38 is further pushed into the drawing port 67a, the dust-proof glass 35 is pushed into the back side. And if the edge part of the cover member 38 contact | abuts with the circumference | surroundings of the drawer outlet of the near side board 67 and block | closes the drawer outlet 67a, as shown in FIG. 13, the dust-proof glass 35 will block | close the light irradiation opening 71a. As described above, this satisfies the relationship of H <(Lb + La). Therefore, when the lid member 38 closes the outlet 67a, as shown in FIG. It can be closed. Further, since the relationship of (Lb + La) <W is satisfied, the end of the dust-proof glass 35 before the end of the lid member 38 comes into contact with the vicinity of the outlet of the front side plate 67 and closes the outlet 67a. It is possible to suppress the portion 35b from abutting against the bent portion 36b of the guide member 36.

  As shown in FIGS. 4 to 8, in the initial stage of use (when the dustproof glass has never been cleaned), the back end 35b of the dustproof glass 35 is bent to 36b of the guide member 36. The engaging portion 38b of the drawing member 38a is positioned at the approximate center of the engaging hole 37a of the engaged portion 37. On the other hand, as shown in FIG. 13, after cleaning the dust-proof glass, the engaging portion 38 b of the drawing member 38 a comes into contact with the back end portion of the engaging hole 37 a of the engaged portion 37.

When the lid member 38 closes the outlet 67 a, the lid member 38 is fixed to the front side plate 67 with the fixing screw 391.
After the lid member is fixed, the engaging portion 38b of the drawing member 38a and the back end surface 37c 'of the engaging hole 37a of the engaged member 37 are in contact with each other, and the movement of the dust-proof glass 35 in the drawing direction is restricted. As a result, the dust-proof glass 35 is prevented from moving in the pull-out direction due to the impact or vibration of the apparatus, and the vicinity of the rear end of the light irradiation port 71a is not covered with the dust-proof glass 35. Can be prevented from entering the casing 71.

  In the above, the engaged member 37 is made of resin, but the engaged member 37 may be made of sheet metal. By using sheet metal, the thickness of the engaged member 37 can be reduced compared to that formed of resin, the outlet 67a can be further narrowed, and the lid member 38 is removed from the apparatus main body. Intrusion of dust and dust from the outlet 67a to the writing area 69 can be further suppressed.

  In the above, the engagement hole 37a is provided in the engaged member 37 and the engagement portion 38b is provided in the drawing member 38a. However, as shown in FIG. 14, the engagement member 37 'is provided in the engagement member 37. Thus, an engagement hole 38b ′ may be provided in the drawing member 38. Further, as shown in FIG. 15, a handle portion 38 c may be provided on the front surface of the lid member 38. Thus, by providing the handle portion 38c, when pulling out the dustproof glass 35, it can be pulled out with the handle portion 38c, and the dustproof glass 35 can be pulled out easily. Also in the example shown in FIG. 14, the outlet 67a can be made narrower by configuring the engaged member and the drawing member 38a of sheet metal.

  In addition, since the lid member 38 is formed by processing a sheet metal, distortion or the like may occur in the manufacturing process, and a slight gap may be formed between the lid member 38 and the outer surface 67b of the near side plate 67. . As a result, if dust or dirt exists around the lid member 38, the dust or dust may enter the writing area 69 from the gap through the outlet 67a. Therefore, as shown in FIG. 16, a cover portion 73 a that covers the lid member 38 is provided on the inner cover 73 that covers the front side surface of the charging device 43, the photoconductor 40, the developing device 41, and the photoconductor cleaning device 42. Also good. Thus, by covering the lid member 38 with the covering portion 73 a of the inner cover 73, it is possible to suppress the intrusion of dust around the lid member 38. As a result, even if a slight gap is formed between the lid member 38 and the outer surface 67b of the front side plate 67, the probability that dust or dust enters the gap is reduced, and the writing area 69 is moved from the outlet 67a. Dust and dust can be prevented from entering.

Further, as shown in FIG. 17, a face plate 74 that can be pulled out is provided on the front side, and this face plate 74 is brought into contact with an edge on the outer surface of the lid member 38, so that the lid member 38 and the outer surface 67 b of the front side plate 67 You may make it suppress that a dust and dust enter | penetrate into a slight clearance gap between them. In the figure, reference numeral 74a denotes a gripping part for pulling out the face plate 74.
Of course, the lid member 73 may be covered with the covering portion 73 a of the inner cover 73 from above the face plate 74.

  As described above, in the image forming apparatus according to the present embodiment, since the lid member 38 that closes the outlet 67a that is the dustproof member outlet is provided, it is possible to prevent dust and dust from entering from the outlet 67a. Thereby, it can suppress that the dust and dust which penetrate | invaded from the outlet 67a to the dust-proof glass 35 which is a dust-proof member can be suppressed, and the dirt of the dust-proof glass 35 can be suppressed. Thereby, the space | interval of the cleaning of the dust-proof glass 35 which a serviceman and a user perform regularly can be expanded.

  The lid member 38 is provided with a drawing member 38a serving as a drawing means for drawing the dust-proof glass 35 from the drawing port 67a. Thereby, even if a service person or a user does not prepare a jig for pulling out the dust-proof glass 35 separately, the dust-proof glass 35 can be pulled out. Further, by pulling out using the pull-out member 38a, the pull-out port 67a can be narrowed as compared with the case where the finger is pushed into the pull-out port 67a and the dust-proof glass is pulled out. Thereby, it can suppress that dust and dust penetrate | invade from the outlet 67a at the time of the dust-proof glass 35 pull-out.

  In addition, an engagement hole 37a that is an engaged portion is provided in the engaged member of the dust-proof glass 35, and an engaging portion 38b that engages with the engagement hole 37a is provided in the drawing member 38a. Thereby, dustproof glass can be pulled out by engaging the engaging part of a drawer member with an engagement hole. Thereby, the dust-proof glass can be pulled out more reliably as compared with the case where an adhesive substance is provided on the drawer member and the sticky substance is adhered to the dust-proof glass and pulled out.

  Further, when the outlet 67a is closed by the lid member 38, the drawer member functions as a restricting means for restricting the movement of the dust-proof glass in the pull-out direction. Thereby, it is possible to prevent the dust-proof glass from moving in the pull-out direction due to the vibration of the apparatus and the like, and the vicinity of the rear end of the light irradiation port 71a communicating with the outside. In addition, by restricting the movement of the dustproof glass in the pull-out direction with the pull-out member, the number of parts can be reduced by a locking mechanism different from that of the pull-out member, compared to that for restricting the movement in the pull-out direction, The cost of the apparatus can be reduced.

  Further, by configuring the writing device 55, which is an optical scanning device, so that it can be drawn out in a direction perpendicular to the drawing direction of the dust-proof glass 35, the engaging portion 38b of the drawing member 38a can be engaged with the engaged member when the writing device is drawn out. It can be pulled out without hitting 37. Therefore, the writing device 55 can be pulled out without removing the lid member 38, and the drawing workability of the writing device 55 can be improved.

  Moreover, by providing a handle part in a cover member, a handle part can be pinched and a cover member can be pulled out and dustproof glass can be easily pulled out from a drawer outlet.

1 is a schematic configuration diagram of a printer according to an embodiment. The top view which looked at the writing device of this embodiment from the upper part. Sectional drawing which looked at the writing apparatus of this embodiment from the side. The schematic perspective view which shows the structure around dustproof glass. The right view of a writing device. AA sectional drawing of FIG. BB sectional drawing of FIG. CC sectional drawing of FIG. DD sectional drawing of FIG. The figure which shows the drawer periphery surrounding structure of a near side board. The schematic perspective view which shows a mode that dustproof glass is pulled out. Sectional drawing which shows a mode that dustproof glass is pulled out. CC sectional drawing after dustproof glass cleaning. The front view which shows the mode of dustproof glass temporary mounting | wearing. The schematic perspective view which shows the example which provided the engaging part in the to-be-engaged member, and provided the engagement hole in the drawing-out member. The schematic perspective view which shows the example which provided the handle part in the cover member. The schematic perspective view which shows the example which covers the cover member periphery with the cover part of an inner cover. The front view which shows the example which made the face plate contact | abut on the edge of a cover member.

Explanation of symbols

35: Dust-proof glass 36: Guide member 38: Lid member 55: Writing device 67: Front side plate 68: Partition plate 69: Writing area 71: Housing 73: Inner cover 74: Face plate

Claims (6)

An image carrier;
A light source, deflection scanning means for deflecting and scanning light generated by the light source in the main scanning direction with respect to the surface of the image carrier, and an optical path of light from the deflection scanning means to the surface of the image carrier. And a dust-proof member that is provided so as to block the light irradiation port of the case and prevents dust from entering the housing from the light irradiation port and forms an optical path And an optical scanning means comprising
In the image forming apparatus configured to be able to draw the dust-proof member out of the apparatus from the dust-proof member outlet,
An image forming apparatus comprising a lid member for closing the dustproof member outlet. The image forming apparatus according to claim 1.
An image forming apparatus, wherein the lid member is provided with drawing means for pulling out the dustproof member from the dustproof member outlet. The image forming apparatus according to claim 2.
An image forming apparatus according to claim 1, wherein an engagement portion is provided on the dust-proof member, and an engagement portion is provided on the pull-out means to engage with the engagement portion. The image forming apparatus according to claim 2 or 3,
When the dustproof member outlet is closed by the lid member, the drawer means functions as a restricting means for restricting movement of the dustproof member in the pulling direction. Image forming apparatus. The image forming apparatus according to any one of claims 2 to 4,
The optical scanning device is configured to be able to be pulled out of the device,
2. An image forming apparatus according to claim 1, wherein a direction in which the optical scanning device is pulled out is a direction orthogonal to a direction in which the dustproof member is pulled out. 6. The image forming apparatus according to claim 2, wherein:
An image forming apparatus comprising a handle on the lid member.

Images