JP2012159622A - Image forming apparatus and processing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming apparatus and a processing unit capable of performing an efficient maintenance work.SOLUTION: The image forming apparatus comprises: an exposure unit 200 forming an electrostatic latent image; a support structure 300 for supporting the exposure unit 200; and a body for storing the exposure unit 200. The support structure 300 formed detachably from the body includes: a drive side plate 330 including a drive part having an output element for outputting driving force to drive the exposure unit 200; and a frame element 320 connected to the drive side plate 330 to form the support structure 300 in cooperation with the drive side plate 330. The exposure unit 200 includes: a storage box body for storing an optical element for scanning light and an input element in which the driving force is inputted from the drive part. The storage box body includes a projection part projecting toward the drive side plate 330. The drive side plate 330 displaceable to the frame element 320 by self-weight of the exposure unit 200 includes an edge face to form a contour of a notch part into which the projection part is stored, and the edge face slidably supports the projection part.

Description

  The present invention relates to an image forming apparatus that forms an electrostatic latent image using an exposure apparatus and a processing apparatus that performs predetermined processing.

  Image forming apparatuses such as copiers, printers, and facsimile machines typically have a photosensitive drum, a charger that charges the photosensitive drum, and light that irradiates the peripheral surface of the charged photosensitive drum. An exposure device that forms a latent image; and a developing device that supplies toner to the peripheral surface of the photosensitive drum on which the electrostatic latent image is formed to form a toner image.

  The exposure apparatus includes various optical elements such as a light source, a mirror that defines an optical path of light from the light source, and a lens that adjusts the diameter of light from the light source. In general, optical elements are susceptible to vibration. Patent Document 1 discloses a technique for reducing the influence of vibration on an optical element.

JP 2005-138442 A

  20 and 21 show a conventional method of attaching the exposure apparatus to the housing of the image forming apparatus. FIG. 20 is a schematic perspective view showing the inner wall of the housing of the image forming apparatus before the exposure apparatus is attached. FIG. 21 shows the exposure apparatus attached to the inner wall of the housing.

  The exposure apparatus 900 that is susceptible to vibration is generally positioned with high accuracy with respect to the inner wall 910 of the casing of the image forming apparatus and is firmly fixed using, for example, screws. The fixing of the conventional strong exposure apparatus 900 suppresses fluctuations in optical settings caused by vibrations and other external forces, while inefficiency in maintenance work on the exposure apparatus 900 or an apparatus existing around the exposure apparatus 900. Bring sex. An operator who performs maintenance work needs to remove the exposure apparatus 900 that is firmly fixed to the inner wall 910 of the housing. After performing maintenance on the target device, the operator needs to position and fix the exposure apparatus 900 with high accuracy.

  The above-described problem is common to other processing apparatuses that are attached to the housing with relatively high accuracy.

  An object of the present invention is to provide an image forming apparatus including an exposure apparatus that enables efficient maintenance work and a processing apparatus including a processing unit that performs predetermined processing.

  An image forming apparatus according to an embodiment of the present invention includes an exposure apparatus that irradiates a charged image forming surface with light to form an electrostatic latent image, a support structure that supports the exposure apparatus, and the exposure apparatus. A driving side plate including a drive unit having an output element that outputs a driving force for driving the exposure apparatus, the support structure formed to be detachable from the housing. And a frame element connected to the drive side plate and forming the support structure in cooperation with the drive side plate, and the exposure apparatus includes a housing box for housing the optical element that scans the light; An input element to which the driving force is input from the driving unit, and the housing box includes a protruding part that protrudes toward the driving side plate, and with respect to the frame element by its own weight. The drive side plate that can be displaced contains the protrusion. Wherein an edge surface forming the contour of the notch, said edge surfaces, characterized in that slidably supports the protruding portion (claim 1).

  According to the above configuration, the exposure apparatus irradiates the charged image forming surface with light to form an electrostatic latent image. The support structure that supports the exposure apparatus accommodated in the housing includes a drive side plate including a drive unit having an output element that outputs a driving force for driving the exposure apparatus, and is connected to the drive side plate and cooperates with the drive side plate. And a frame element forming a support structure. Since the support structure is formed to be detachable from the housing, an efficient maintenance work is achieved. Since the driving side plate can be displaced with respect to the frame element by the weight of the exposure apparatus, the driving side plate absorbs an error in manufacturing the housing and / or the support structure. As a result, the exposure apparatus is appropriately positioned with respect to the housing.

  The exposure apparatus includes a housing box that houses an optical element that scans light, and an input element that receives a driving force from a driving unit. The storage box includes a protrusion that protrudes toward the drive side plate. The drive side plate includes an edge surface that forms the contour of the notch in which the protrusion is accommodated. Since the edge surface slidably supports the protruding portion, even if the driving side plate is displaced with respect to the frame element due to its own weight, the exposure device is appropriately held by the driving side plate and input from the output element. The driving force is properly transmitted to the element.

  In the above configuration, it is preferable that the support structure supports the exposure apparatus so that the exposure apparatus is displaced with respect to the support structure when the driving side plate is displaced with respect to the frame element. Item 2).

  According to the above configuration, since the edge surface slidably supports the protruding portion, the exposure apparatus can be displaced with respect to the support structure when the driving side plate is displaced with respect to the frame element. Therefore, the exposure apparatus is appropriately held on the driving side plate.

  The said structure WHEREIN: It is preferable that the said protrusion part contains an arc-shaped surrounding surface, and the said notch part has an arc-shaped outline complementary to the said arc-shaped surrounding surface of the said protrusion part (Claim 3).

  According to the said structure, a protrusion part contains an arc-shaped surrounding surface. Since the notch has an arcuate contour complementary to the arcuate peripheral surface of the protrusion, the exposure apparatus can be rotationally displaced relative to the support structure. Therefore, the exposure apparatus is appropriately held on the driving side plate.

  In the above configuration, it is preferable that the positional relationship between the notch and the output element is kept constant during the displacement of the driving side plate with respect to the frame element.

  According to the above configuration, since the exposure apparatus is rotationally displaced with respect to the support structure, the positional relationship between the notch and the output element is kept constant during the displacement of the driving side plate with respect to the frame element. Thus, the positional relationship between the input element and the output element of the exposure apparatus is also kept constant, and the driving force is appropriately transmitted from the output element to the input element.

  In the above configuration, the storage box includes a window that transmits light toward the image forming surface, the exposure apparatus includes a cleaning unit that cleans the window, and the drive unit includes the cleaning unit. It is preferable to drive (claim 5).

  According to the above configuration, the storage box includes the window portion that transmits light toward the image forming surface. The exposure apparatus includes a cleaning unit that cleans the window. The drive unit drives the cleaning unit. Since the driving force is properly transmitted from the output element to the input element, the window is properly cleaned. Thus, since the light traveling toward the image forming unit is hardly hindered by the dirt on the window, the exposure apparatus can appropriately form an electrostatic latent image.

  A processing apparatus according to another embodiment of the present invention includes a processing unit that performs a predetermined process, a support structure that supports the processing unit, and a housing that houses the processing unit. The support structure formed so as to be detachable with respect to the drive side plate includes a drive side plate including a drive unit having an output element that outputs a drive force for driving the processing unit, and is connected to the drive side plate and cooperates with the drive side plate. A frame element that works to form the support structure, and the processing unit includes: a protruding portion that protrudes toward the driving side plate; and an input element that receives the driving force from the driving portion. The driving side plate that is displaceable with respect to the frame element by its own weight includes an edge surface that forms a contour of a notch in which the protrusion is accommodated, and the edge surface includes the protrusion. Support slidably Wherein (claim 6).

  According to the above configuration, the support structure that supports the processing unit accommodated in the housing is connected to the driving side plate including the driving unit having an output element that outputs a driving force for driving the processing unit, and the driving side plate. And a frame element that cooperates with the drive side plate to form a support structure. Since the support structure is formed to be detachable from the housing, an efficient maintenance work is achieved. Since the driving side plate can be displaced with respect to the frame element by its own weight, the driving side plate absorbs an error in manufacturing the housing and / or the support structure. As a result, the processing unit that performs the predetermined processing is appropriately positioned with respect to the housing.

  The processing unit includes a protruding portion that protrudes toward the driving side plate, and an input element that receives a driving force from the driving portion. The drive side plate includes an edge surface that forms the contour of the notch in which the protrusion is accommodated. Since the edge surface slidably supports the protrusion, even if the driving side plate is displaced with respect to the frame element due to the weight of the processing unit, the processing unit is appropriately held by the driving side plate and input from the output element. The driving force is properly transmitted to the element.

  As described above, the present invention enables efficient maintenance work.

1 is a schematic perspective view of an image forming apparatus according to an embodiment. FIG. 2 is a schematic perspective view of an exposure apparatus pulled out from a housing of the image forming apparatus shown in FIG. 1 and a support structure that supports the exposure apparatus. FIG. 3 is a schematic perspective view of a housing of the image forming apparatus from which the exposure apparatus and the support structure shown in FIG. 2 are removed. It is the schematic of the internal structure shown by FIG. FIG. 3 is a schematic perspective view of a support structure that supports the exposure apparatus shown in FIG. 2. FIG. 6 is a schematic bottom view of a support structure that supports the exposure apparatus shown in FIG. 5. FIG. 3 is a schematic view of an internal structure of the image forming apparatus observed from an insertion port formed in a housing of the image forming apparatus shown in FIG. 2. FIG. 3 is a schematic perspective view of the exposure apparatus shown in FIG. 2. FIG. 6 is a schematic perspective view of the support structure shown in FIG. 5. FIG. 9 is a schematic perspective view of a fixing piece for fixing the exposure apparatus shown in FIG. 8 to a support structure. FIG. 9 is a perspective view schematically showing connection between the exposure apparatus shown in FIG. 8 and a support structure. FIG. 3 is a schematic front view of a support structure that supports the exposure apparatus shown in FIG. 2. FIG. 3 is a schematic perspective view of a support structure that supports the exposure apparatus shown in FIG. 2. FIG. 3 is a schematic perspective view of a support structure that supports the exposure apparatus shown in FIG. 2. FIG. 3 is a schematic perspective view of a support structure that supports the exposure apparatus shown in FIG. 2. FIG. 3 is a schematic perspective view of a support structure that supports the exposure apparatus shown in FIG. 2. FIG. 3 is a schematic perspective view of a connection portion between the exposure apparatus shown in FIG. 2 and a drive unit that drives the exposure apparatus. FIG. 18 is a schematic perspective view of the drive unit shown in FIG. 17. FIG. 19 is a schematic perspective view of a second frame plate in which the drive unit shown in FIG. 18 is incorporated. It is a schematic perspective view which shows the inner wall of the housing | casing of the conventional image forming apparatus before an exposure apparatus is attached. It is a schematic perspective view which shows the exposure apparatus attached to the inner wall shown by FIG.

  Hereinafter, an embodiment of an image forming apparatus will be described with reference to the accompanying drawings. It should be noted that the terms representing directions such as “up”, “down”, “left”, and “right” used in the following description are merely for the purpose of clarifying the explanation, and the principle of the image forming apparatus is used. It is not limited at all.

(Image forming device)
FIG. 1 is a perspective view of an image forming apparatus according to an embodiment. The image forming apparatus shown in FIG. 1 is a copying machine. Alternatively, a printer, a facsimile machine, a multifunction machine having these functions, or another apparatus capable of forming an image on a sheet may be used as the image forming apparatus.

  The copying machine 100 includes a casing 110 that houses various devices for forming an image on a sheet. The term “sheet” used in the description of the present embodiment means plain paper, an OHP sheet, cardboard, tracing paper, postcards, and other sheet-like materials on which toner images can be formed.

  The housing 110 includes a lower housing 111 that accommodates various devices for forming a toner image, an upper housing 112 disposed above the lower housing 111, and a lower housing 111 and an upper housing 112. Intermediate housing 113 disposed between the two. The upper housing 112 mainly accommodates a device for reading a document image. The intermediate casing 113 is formed along the right side and the back side of the copying machine. Accordingly, a space DR is formed between the lower housing 111 and the upper housing 112. The intermediate housing 113 mainly accommodates a discharge device for discharging the sheet after the copying process to the space DR.

  The copying machine 100 further includes an operation panel 120 attached to the upper housing 112. The operation panel 120 includes, for example, a start button 121 for starting copying of the copying machine 100, an input button 122 for inputting the number of copies and copy density, and a display 123 for displaying input contents to the user. The user can instruct the copying machine 100 through the operation panel 120 for a desired operation.

  The copying machine 100 further includes a document supply device 130 disposed on the upper housing 112. The document supply device 130 includes a cover element 131 that lies along the upper surface of the upper housing 112, and a tray 132 that is disposed above the cover element 131. The tray 132 is inclined upward toward the right. The document supply device 130 further includes a connection portion 133 that connects the cover element 131 and the tray 132, and a supply unit (not shown) disposed in the connection portion 133.

  The user can place a document on the tray 132. When the user presses the start button 121 on the operation panel 120, the supply unit in the connection unit 133 pulls the document on the tray 132 into the connection unit 133. The supply unit then feeds the document between the cover element 131 and the upper housing 112. Various devices arranged in the upper housing 112 read an image of a document between the cover element 131 and the upper housing 112. Various devices arranged in the lower casing 111 form a toner image on a sheet according to the read image data of the document. Thereafter, the sheet is discharged into the space DR by the discharge device in the intermediate casing 113.

  The document feeder 130 is connected to the upper housing 112 so as to be rotatable up and down. The user may rotate the document supply device 130 upward as necessary. Thereafter, the user can place a desired document on the upper casing 112. The user may rotate the document supply device 130 downward to press the document placed on the upper housing 112. When the user presses the start button 121, the device in the upper housing 112 starts reading an image of a document.

  The copying machine 100 further includes a cassette 140 that stores sheets. The cassette 140 is inserted into the lower part of the lower housing 111. Various devices housed in the lower housing 111 take out the sheets in the cassette 140 one by one. The sheet is subjected to an image forming process while being conveyed in the lower housing, and is finally discharged into the space DR. When the sheets in the cassette 140 run out, the user can pull out the cassette 140 from the lower housing and replenish the sheets.

  The copier 100 may include an additional transport unit 190 as necessary. The transport unit 190 is disposed below the lower housing 111. The transport unit 190 includes additional cassettes 191 and 192. The user can operate the operation panel 120 to select a sheet supply source from the cassettes 140, 191, and 192.

  The lower housing 111 includes a decorative plate 114 that covers the left surface. The decorative board 114 is removed from the copying machine 100 as necessary.

  FIG. 2 is an enlarged perspective view of the lower housing 111 from which the decorative plate 114 is removed. The copier 100 will be further described with reference to FIGS. 1 and 2.

  The lower housing 111 includes a left side wall 115. A substantially rectangular insertion opening 116 is formed in the left side wall 115. The copying machine 100 further includes an exposure apparatus 200 and a support frame 300 that supports the exposure apparatus 200. The exposure apparatus 200 irradiates a laser beam in accordance with the read image data of the document to form an electrostatic latent image. In the present embodiment, the support frame 300 is exemplified as a support structure.

  The user can pull out the support frame 300 to the left via the insertion opening 116 after removing the decorative board 114. Since the exposure apparatus 200 is pulled out of the housing 110 together with the support frame 300, the user can relatively easily perform cleaning, adjustment, replacement or repair of the exposure apparatus 200. The user can then insert the support frame 300 that supports the exposure apparatus 200 into the housing 110 via the insertion port 116. Thus, the exposure apparatus 200 can be easily accommodated in the lower casing 111.

  FIG. 3 is a schematic perspective view of the copying machine 100 from which the exposure apparatus 200 and the support frame 300 are removed. The copier 100 will be further described with reference to FIGS. 1 to 3.

  The lower housing 111 further includes a right side wall 117 opposite to the left side wall 115, a front wall 118 extending between the left side wall 115 and the right side wall 117, and a rear wall 119 opposite to the front wall 118. The lower housing 111 further includes a support plate 160 having an upper surface for supporting the support frame 300 inserted into the lower housing 111. The support plate 160 includes a peripheral edge 161 fixed to the inner surfaces of the left side wall 115, the right side wall 117, the front wall 118, and the rear wall 119. The support plate 160 further includes a pair of protrusions 162 protruding upward. The protrusion 162 extends along the insertion direction of the support frame 300 and the exposure apparatus 200. The protrusion 162 guides the movement of the support frame 300 and the exposure apparatus 200 in the insertion direction and / or the pull-out direction.

  FIG. 4 is a schematic diagram showing the internal structure of the copying machine 100. The copying machine 100 is further described with reference to FIGS. 1, 2, and 4. Note that FIG. 4 does not show the transport unit 190 described in relation to FIG.

  In the present embodiment, the support frame 300 supports the four exposure apparatuses 200. The four exposure apparatuses 200 are formed separately from each other. The four exposure apparatuses 200 are individually attached to the support frame 300.

  The copying machine 100 further includes four image forming units 400 disposed above the support frame 300. The four image forming units 400 correspond to the four exposure apparatuses 200, respectively. The leftmost image forming unit 400 forms an image corresponding to the magenta component of the original image. The image forming unit 400 adjacent to the image forming unit 400 corresponding to the magenta component forms an image corresponding to the cyan component of the original image. The rightmost image forming unit 400 forms an image corresponding to the black component of the original image. The image forming unit 400 adjacent to the image forming unit 400 corresponding to the black component forms an image corresponding to the yellow component of the original image.

  The image forming unit 400 includes a substantially cylindrical photosensitive drum 410 and a charger 420 disposed below the photosensitive drum 410. The charger 420 charges the peripheral surface of the photosensitive drum 410 substantially uniformly. The exposure apparatus 200 irradiates the charged peripheral surface of the photosensitive drum 410 with laser light based on the image data of the document, thereby forming an electrostatic latent image. The exposure apparatus 200 that irradiates the photosensitive drum 410 of the image forming unit 400 corresponding to the magenta component with laser light forms an electrostatic latent image based on the image data corresponding to the magenta component. The exposure apparatus 200 that irradiates the photosensitive drum 410 of the image forming unit 400 corresponding to the cyan component with laser light forms an electrostatic latent image based on the image data corresponding to the cyan component. The exposure apparatus 200 that irradiates the photosensitive drum 410 of the image forming unit 400 corresponding to the yellow component with laser light forms an electrostatic latent image based on the image data corresponding to the yellow component. The exposure apparatus 200 that irradiates the photosensitive drum 410 of the image forming unit 400 corresponding to the black component with laser light forms an electrostatic latent image based on the image data corresponding to the black component. In the present embodiment, the peripheral surface of the photosensitive drum 410 is exemplified as an image forming surface.

  The image forming unit 400 further includes a developing device 430 that supplies toner to the peripheral surface of the photosensitive drum 410 on which the electrostatic latent image is formed, and develops (visualizes) the electrostatic latent image. By supplying the toner from the developing device 430, a toner image that substantially matches the electrostatic latent image is formed on the peripheral surface of the photosensitive drum 410. The developing device 430 of the image forming unit corresponding to the magenta component supplies magenta toner to the photosensitive drum 410. The developing device 430 of the image forming unit corresponding to the cyan component supplies cyan toner to the photosensitive drum 410. The developing device 430 of the image forming unit corresponding to the yellow component supplies yellow toner to the photosensitive drum 410. The developing device 430 of the image forming unit corresponding to the black component supplies black toner to the photosensitive drum 410.

  The image forming unit 400 further includes a cleaning device 440. The cleaning device 440 removes the toner remaining on the peripheral surface of the photosensitive drum 410 after the toner image is transferred. Transfer (primary transfer) of the toner image from the photosensitive drum 410 will be described later.

  The peripheral surface of the photoconductive drum 410 cleaned by the cleaning device 440 goes to the charger 420 again. The charger 420 charges the peripheral surface of the photosensitive drum 410 again. The exposure apparatus 200 newly forms an electrostatic latent image on the peripheral surface of the charged photosensitive drum 410.

  The copying machine 100 includes a toner container 43M that stores magenta toner, a toner container 43C that stores cyan toner, a toner container 43Y that stores yellow toner, and a toner container that stores black toner. 43Bk. The toner container 43M supplies toner to the developing device 430 of the image forming unit 400 corresponding to the magenta component. The toner container 43C supplies toner to the developing device 430 of the image forming unit 400 corresponding to the cyan component. The toner container 43Y supplies toner to the developing device 430 of the image forming unit 400 corresponding to the yellow component. The toner container 43Bk supplies toner to the developing device 430 of the image forming unit 400 corresponding to the black component.

  The copying machine 100 further includes a transfer unit 500 formed between the toner containers 43M, 43C, 43Y, 43Bk and the image forming unit 400. The transfer unit 500 includes a transfer belt 510 to which a toner image is transferred from the photosensitive drum 410, a drive roller 520 that drives the transfer belt 510, a driven roller 530 that is disposed on the left side of the drive roller 520, and a drive roller. A tension roller 540 that applies tension to the transfer belt 510 between the 520 and the driven roller 530. The transfer belt 510 runs around the driving roller 520, the driven roller 530, and the tension roller 540.

  The transfer unit 500 further includes four transfer rollers 550. Four transfer rollers 550 are disposed above each of the four photosensitive drums 410. The transfer belt 510 is sandwiched between the transfer roller 550 and the photosensitive drum 410 to form a nip portion. The toner image is transferred from the photosensitive drum 410 to the transfer belt 510 at the nip portion.

  A magenta toner image is transferred to the outer surface of the transfer belt 510 that passes between the photosensitive drum 410 and the transfer roller 550 of the image forming unit 400 corresponding to the magenta component. Thereafter, when the transfer belt 510 passes between the photosensitive drum 410 and the transfer roller 550 of the image forming unit 400 corresponding to the cyan component, the cyan toner image is overcoated on the magenta toner image. After that, when the transfer belt 510 passes between the photosensitive drum 410 and the transfer roller 550 of the image forming unit 400 corresponding to the yellow component, the yellow toner image is further overcoated. Finally, when the transfer belt 510 passes between the photosensitive drum 410 of the image forming unit 400 corresponding to the black component and the transfer roller 550, the black toner image is further overcoated to complete a full color toner image. .

  The transfer unit 500 further includes a transfer roller 560 adjacent to the drive roller 520. The sheet S conveyed from the cassette 140 passes between the driving roller 520 and the transfer roller 560. During this time, as described above, the toner image formed on the transfer belt 510 is electrostatically transferred to the sheet S.

  The transfer unit 500 further includes a cleaning device 570. The cleaning device 570 removes the toner remaining on the outer surface of the transfer belt 510 after the toner image is transferred to the sheet S.

  The cassette 140 includes a lift plate 141 on which a bundle of sheets S is placed. A base end portion 142 of the lift plate 141 is rotatably attached to the side wall of the cassette 140.

  The cassette 140 further includes a biasing mechanism 143 that biases the lift plate 141 upward. The copying machine 100 further includes a pickup roller 151 disposed above the leading edge of the sheet S on the lift plate 141. When the urging mechanism 143 pushes up the tip of the lift plate 141 upward, the leading edge of the sheet S is pressed against the pickup roller 151. When the pickup roller 151 rotates, the sheet S is conveyed out of the cassette 140.

  The copying machine 100 further includes a paper feed roller 152 disposed downstream of the pickup roller 151 and a retard roller 153 adjacent to the paper feed roller 152. The paper feed roller 152 rotates to convey the sheet S further downstream. When the pickup roller 151 transports a single sheet S from the cassette 140, the retard roller 153 rotates as the sheet S is transported. When the pickup roller 151 conveys a plurality of sheets S from the cassette 140, a torque limiter (not shown) of the retard roller 153 is operated, and the retard roller 153 is stopped. Accordingly, the retard roller 153 generates a frictional force that resists the conveyance of the sheet S. As a result, only the sheet S that is in direct contact with the paper feed roller 152 is conveyed further downstream. The remaining sheet S is fastened before the retard roller 153. Thus, the sheets S are conveyed downstream one by one.

  A paper feed conveyance path 154 extending from the paper feed roller 152 to the transfer roller 560 is formed in the lower housing 111. The copying machine 100 further includes a conveyance roller pair 155 and a registration roller pair 156 disposed along the paper feed conveyance path 154. The sheet S sent downstream by the paper feed roller 152 is sent to the registration roller pair 156 by the transport roller pair 155. The registration roller pair 156 sends the sheet S between the driving roller 520 and the transfer roller 560 in synchronization with the timing of forming a full-color toner image on the transfer belt 510. As described above, the full-color toner image is transferred to the sheet S between the driving roller 520 and the transfer roller 560.

  The copying machine 100 further includes a fixing device 600 that fixes the toner image on the sheet S. The fixing device 600 includes a heating belt 610 that gives thermal energy to the sheet S, a heating roller 620 that heats the heating belt 610, and a fixing roller 630 that drives the heating belt 610 in cooperation with the heating roller 620. The heating belt 610 circulates around the heating roller 620 and the fixing roller 630.

  The fixing device 600 further includes a pressure roller 640 that is pressed against the heating belt 610. The heating belt 610 is sandwiched between the fixing roller 630 and the pressure roller 640 to form a nip portion. When the sheet S passes through the nip portion, the toner is melted and the toner image is fixed on the sheet S.

  Downstream of the fixing device 600, the conveyance path that guides the sheet S branches into a discharge conveyance path 157 that goes to the space DR and a return conveyance path 158 that curves toward the right side wall 117 of the housing 110.

  The copying machine 100 further includes a discharge roller pair 159 disposed at the end of the discharge conveyance path 157. When the user operates the operation panel 120 to instruct single-sided printing, the discharge roller pair 159 discharges the sheet S to the space DR. When the user operates the operation panel 120 to instruct double-sided printing, the discharge roller pair 159 sends the sheet S to the space DR by a predetermined length and then reversely rotates. As a result, the sheet S is sent out to the return conveyance path 158.

  The return conveyance path 158 extends downward along the right side wall 117, and then curves toward the paper feed conveyance path 154. The return conveyance path 158 and the paper feed conveyance path 154 merge before the registration roller pair 156.

  The registration roller pair 156 sends the sheet S between the driving roller 520 and the transfer roller 560 again. As a result, images are formed on both sides of the sheet S. When the sheet S passes through the fixing device 600 again, the newly formed toner image is fixed to the sheet S. Thereafter, the sheet S is discharged into the space DR by the discharge roller pair 159.

  The copying machine 100 further includes a reading device 700 disposed in the upper housing 112. The reading apparatus 700 includes a light source 710 that irradiates light toward a document placed on the upper surface of the upper housing 112, a plurality of mirrors 720 that receive reflected light from the document and form an optical path of reflected light, and reflected light. And a generation unit 730 for generating image data. The above-described exposure apparatus 200 scans the laser beam based on the image data generated by the generation unit 730.

  The lower housing 111 further includes a positioning wall 310 for positioning the support frame 300 that supports the exposure apparatus 200. The positioning wall 310 faces the left side wall 115. As described with reference to FIGS. 2 and 3, when the support frame 300 that supports the exposure apparatus 200 is inserted into the lower casing 111 through the insertion slot 116, the positioning wall 310 is separated from the support frame 300. The support frame 300 and the exposure apparatus 200 are positioned with respect to the casing 110.

(Support structure)
FIG. 5 is a schematic perspective view of a support frame 300 that supports the exposure apparatus 200. FIG. 6 is a schematic bottom view of the support frame 300 shown in FIG.

  The support frame 300 includes a first frame plate 320 extending in the insertion direction and a second frame plate 330 facing the first frame plate 320. The exposure apparatus 200 is disposed and supported between a first frame plate 320 and a second frame plate 330 disposed substantially in parallel. In the present embodiment, the direction substantially orthogonal to the insertion direction is the main scanning direction of the exposure apparatus 200.

  The support frame 300 further includes a third frame plate 340 connected to the right end of the first frame plate 320 and the right end of the second frame plate 330. The first frame plate 320 includes a vertical tongue 321 that protrudes with respect to the third frame plate 340 extending in the main scanning direction. Similarly, the second frame plate 330 includes a vertical tongue 331 that protrudes with respect to the third frame plate 340 extending in the main scanning direction. The third frame plate 340 includes a horizontal tongue piece 341. The horizontal tongue 341 protrudes to the right from the approximate center in the longitudinal direction of the third frame plate 340. The vertical tongue pieces 321 and 331 are used for positioning the support frame 300 in the vertical direction. The horizontal tongue piece 341 is used for positioning the support frame 300 in the horizontal direction.

  The support frame 300 further includes a fourth frame plate 350 that faces the third frame plate 340. The fourth frame plate 350 is connected to the left end portion of the first frame plate 320 and the left end portion of the second frame plate 330.

  The second frame plate 330 includes a driving motor 334 that generates a driving force for driving the exposure apparatus 200, and a driving unit 335 that outputs the driving force of the driving motor 334 to the exposure apparatus 200. In the present embodiment, the drive unit 335 is exemplified as an output element. Moreover, the drive motor 334 and the drive unit 335 are illustrated as a drive part. In addition, the second frame plate 330 is exemplified as a driving side plate. The third frame plate 340 and the fourth frame plate 350 connected to the second frame plate 330 and the first frame plate connected to the second frame plate 330 through the third frame plate 340 and the fourth frame plate 350. 320 is illustrated as a frame element.

  FIG. 7 shows the internal structure of the copying machine 100 observed through the insertion slot 116 formed in the left side wall 115. The support frame 300 and the exposure apparatus 200 are removed from the copying machine 100 shown in FIG. The positioning wall 310 will be described with reference to FIGS.

  The positioning wall 310 is observed through the insertion port 116. The positioning wall 310 includes an inner wall surface 315 that faces the support frame 300. On the inner wall surface 315, a pair of vertical slits 311 extending in the vertical direction and a horizontal slit 312 extending in the horizontal direction are formed. The vertical slit 311 is formed to be complementary to the cross section of the vertical tongue pieces 321 and 331 (substantially equal in height). When the support frame 300 is inserted into the lower housing 111, the vertical tongue pieces 321 and 331 are inserted into the vertical slit 311. As a result, the support frame 300 is positioned in the vertical direction. The horizontal slit 312 is formed to be complementary to the cross section of the horizontal tongue piece 341 (substantially equal in width). When the support frame 300 is inserted into the lower housing 111, the horizontal tongue piece 341 is inserted into the horizontal slit 312. As a result, the support frame 300 is positioned in the horizontal direction.

  FIG. 8 is a schematic perspective view of the exposure apparatus 200. FIG. 9 is a schematic perspective view of the support frame 300. The exposure apparatus 200 will be described with reference to FIGS. 2, 5, 8 and 9.

  The exposure apparatus 200 includes various optical elements (not shown) for scanning light that forms an electrostatic latent image, and a casing 210 that houses the optical elements. The housing 210 includes a front wall 211 along the first frame plate 320 and a back wall 212 along the second frame plate 330. The front wall 211 includes a substantially cylindrical first boss 213 and second boss 214 that extend toward the first frame plate 320. In the present embodiment, the housing 210 is exemplified as a storage box.

  The upper edge of the first frame plate 320 is formed with a notch 326 that is complementary to the lower portion of the first boss 213 and the lower portion of the second boss 214. The first boss 213 and the second boss 214 are inserted into the notch 326 of the first frame plate 320. The exposure apparatus 200 is supported by the first frame plate 320 by the first boss 213 and the second boss 214 meshing with the notch 326.

  A mounting hole 215 is formed between the first boss 213 and the second boss 214. The first frame plate 320 is formed with an opening 327 that communicates with the attachment hole 215. The user can fix the housing 210 to the first frame plate 320 by screwing an appropriate fixing tool (for example, a screw or a screw) into the mounting hole 215.

  An adjustment hole 216 communicating with the inside of the housing 210 is formed in the front wall 211. The opening 327 formed in the first frame plate 320 communicates with the adjustment hole 216. The user can adjust the setting of the optical element in the housing 210 by inserting the tip of the tool into the housing 210 through the adjustment hole 216. Thus, the optical settings of the four exposure apparatuses 200 are appropriately adjusted individually with respect to the support frame 300 appropriately positioned with respect to the casing 110 of the copying machine 100.

  The housing 210 includes a substantially rectangular window 219 formed from dustproof glass. A window 219 along the right edge of the upper surface of the casing 210 extends in the main scanning direction of the exposure apparatus 200. A laser beam from a light source disposed in the housing 210 passes through the window 219 and is irradiated on the peripheral surface of the photosensitive drum 410.

  The exposure apparatus 200 includes a cleaning unit 230 that cleans the window 219. The cleaning unit 230 includes a screw shaft 231 extending along the left edge of the window portion 219, a ring portion 232 attached to the screw shaft 231, and a wiper portion 233 extending from the ring portion 232 and contacting the window portion 219. Including. A driving force from the driving motor 334 is transmitted to the screw shaft 231 via the driving unit 335. As a result, the screw shaft 231 rotates in both directions. The ring portion 232 can reciprocate in the main scanning direction by bidirectional rotation of the screw shaft 231. Thus, the window portion 219 is suitably cleaned by the wiper portion 233.

  FIG. 10 is a schematic perspective view of a fixed piece used for connecting the exposure apparatus 200 to the first frame plate 320. The connection of the exposure apparatus 200 to the first frame plate 320 will be described with reference to FIGS. 2, 5, 8 to 10.

  The exposure apparatus 200 is inserted into the support frame 300 from above. As a result, the first boss 213 and the second boss 214 are inserted into the notch 326 formed in the first frame plate 320.

  The copying machine 100 further includes a substantially rectangular fixed piece 250. The exposure apparatus 200 inserted into the support frame 300 is fixed to the support frame 300 using a fixing piece 250. The fixing piece 250 is formed with a first hole 251 that is complementary to the first boss 213 and a second hole 252 that is complementary to the second boss 214.

  The leading end of the first boss 213 attached to the first frame plate 320 is inserted into the first hole 251. The second boss 214 attached to the first frame plate 320 is inserted into the second hole 252.

  A through hole 253 is formed in the fixed piece 250. The first frame plate 320 may be formed with screw holes 328 communicating with a pair of through holes 253 formed below the first hole portion 251 and the second hole portion 252, respectively. The user may insert an appropriate fixing tool such as a screw or a screw into the through hole 253 and screw it into the screw hole 328 of the first frame plate 320. As a result, the fixed piece 250 is fixed to the first frame plate 320, and the vertical movement of the exposure apparatus 200 is appropriately regulated.

  A through hole 254 is further formed at a substantially intermediate position between the first hole 251 and the second hole 252. The through hole 254 communicates with a mounting hole 215 formed in the front wall 211 of the exposure apparatus 200. The user can screw an appropriate fixing tool such as a screw or a screw into the mounting hole 215 through the through hole 254. Thus, the connection of the fixed piece 250, the first frame plate 320, and the exposure apparatus 200 is achieved.

  The fixed piece 250 includes a substantially cylindrical protruding tube 255. The internal space of the protruding cylinder 255 communicates with an adjustment hole 216 formed in the front wall 211 of the exposure apparatus 200. The user can adjust the optical elements of the exposure apparatus 200 by inserting a predetermined tool into the protruding cylinder 255.

  FIG. 11 is a perspective view showing a connection structure between the exposure apparatus 200 and the second frame plate 330. The connection between the exposure apparatus 200 and the second frame plate 330 will be described with reference to FIGS. 2, 5, 9 and 11.

  The back wall 212 of the exposure apparatus 200 includes a cylindrical third boss 217 extending toward the second frame plate 330. The second frame plate 330 is formed with a complementary notch 332 below the third boss 217. A third boss 217 formed at a position substantially opposite to the first boss 213 is inserted into a notch 332 formed in the second frame plate 330. The exposure apparatus 200 is supported by the second frame plate 330 by the third boss 217 engaging with the notch 332. In this embodiment, the 3rd boss | hub 217 is illustrated as a protrusion part.

  The back wall 212 further includes an arm portion 218 that extends toward the second frame plate 330. The arm portion 218 is formed at a position substantially opposite to the second boss 214. The arm portion 218 extends along the upper edge surface 333 of the second frame plate 330.

  The copier 100 further includes an absorbing member 260. The absorbing member 260 is placed on the upper edge surface 333 of the second frame plate 330. The arm part 218 is installed on the absorbing member 260. As the absorbing member 260, for example, a rubber plate piece is preferably used.

  The screw shaft 231 includes an input gear 234. A driving force from the driving motor 334 is input to the input gear 234 attached to the end of the screw shaft 231. In the present embodiment, the input gear 234 is exemplified as an input element.

  FIG. 12 is a schematic front view of the support frame 300. The cooling of the exposure apparatus 200 will be described with reference to FIGS. 3, 5, 6 and 12. The following description related to the first frame plate 320 is similarly applied to the second frame plate 330.

  The exposure apparatus 200 typically includes a light source (not shown) for generating laser light and a motor (not shown) for rotating a polygon mirror for scanning the laser light. The optical structure of the exposure apparatus 200 may be the same as that of an exposure apparatus used in a known image forming apparatus.

  As shown in FIG. 6, the exposure apparatus 200 further includes a heat sink 220 for releasing heat from the light source and motor described above to the outside of the casing 210. The heat sink 220 is attached to the bottom surface of the housing 210.

  The first frame plate 320 further includes a raised portion 322 raised downward and a lower belt portion 323 bent outward with respect to the raised portion 322. While the support frame 300 is inserted into the lower casing 111 or while the support frame 300 is pulled out from the lower casing 111, the outer edge 324 of the lower belt portion 323 has been described in relation to FIG. It slides on the inner surface 163 of the ridge 162. Thus, the movement of the support frame 300 within the lower housing 111 is appropriately controlled.

  The heat from the heat sink 220 is released into a space surrounded by the raised portion 322 of the first frame plate 320, the raised portion of the second frame plate 330, the support plate 160, and the bottom surface of the casing 210 of the exposure apparatus 200. .

  The copier 100 may further include a blower (not shown) such as a fan. The air blower causes air to flow in the casing 110 of the copying machine 100. A large number of ventilation openings 325 are formed in the raised portion 322. The air vent 325 is configured to allow the inflow of air into the space surrounded by the raised portion 322 of the first frame plate 320, the raised portion of the second frame plate 330, the support plate 160, and the bottom surface of the casing 210 of the exposure apparatus 200, and / or Or it encourages the outflow of air from the space. Thus, the heat dissipation efficiency of the exposure apparatus 200 is improved.

  FIG. 13 is a schematic perspective view of a support frame 300 that supports the exposure apparatus 200. The support frame 300 will be further described with reference to FIGS. 5 and 13.

  The first frame plate 320 is connected to the fourth frame plate 350 using a single horizontal screw 361 fitted in the horizontal direction and a single vertical screw 362 fitted in the vertical direction. Similarly, the first frame plate 320 is connected to the third frame plate 340 using a single horizontal screw 361 fitted in the horizontal direction and a single vertical screw 362 fitted in the vertical direction. The

  The second frame plate 330 is connected to the fourth frame plate 350 using a single horizontal screw 361 fitted in the horizontal direction and a single vertical screw 362 fitted in the vertical direction. Similarly, the second frame plate 330 is connected to the third frame plate 340 using a single horizontal screw 361 fitted in the horizontal direction and a single vertical screw 362 fitted in the vertical direction. The

  Due to the insertion of the horizontal screws 361 and the vertical screws 362, the tolerances of the through holes formed in the first frame plate 320, the second frame plate 330, the third frame plate 340 and / or the fourth frame plate 350 are supported. The first frame plate 320, the second frame plate 330, the third frame plate 340, and / or the fourth frame plate 350 are allowed to be slightly displaced by the weight of the exposure apparatus 200 supported by the frame 300. Therefore, the support frame 300 can be deformed according to the weight of the exposure apparatus 200 in accordance with the shape of the casing 110 of the copying machine 100.

  FIG. 14 is a schematic perspective view of a support frame 300 that supports the exposure apparatus 200. FIG. 15 is a schematic perspective view of the support frame 300 accommodated in the casing 110 of the copying machine 100. The support frame 300 is further described with reference to FIGS. 5, 7, and 13 to 15.

  The first frame plate 320 includes a tongue piece 329 that protrudes with respect to the fourth frame plate 350. Similarly, the second frame plate 330 includes a tongue piece 339 protruding with respect to the fourth frame plate 350. The support frame 300 further includes a mounting plate 370 adjacent to the fourth frame plate 350. A slit hole 371 is formed in the mounting plate 370. The tongue piece 339 protrudes from the mounting plate 370 through the slit hole 371.

  As described above, the support frame 300 is deformed by the weight of the exposure apparatus 200. Therefore, the tongue pieces 329 and 339 are brought into contact with the lower end of the peripheral edge forming the outline of the slit hole 371. Similarly, the vertical tongue pieces 321 and 331 are brought into contact with the lower end of the peripheral edge forming the outline of the vertical slit 311. As shown in FIG. 15, the attachment plate 370 is attached to the casing 110 of the copying machine 100. Thus, the support frame 300 is appropriately fixed to the housing 110.

  FIG. 16 is a schematic perspective view of the support frame 300 placed on the support plate 160. The support frame 300 is further described with reference to FIGS. 4, 5, and 16.

  As described above, the support frame 300 is slightly deformed according to the weight of the exposure apparatus 200. Therefore, the support frame 300 is appropriately supported by the support plate 160 with hardly rising from the upper surface of the support plate 160.

  The components of a support structure that supports a processing apparatus such as an exposure apparatus that requires high-precision installation are generally joined by welding. Therefore, a general support structure has a relatively high rigidity. The support structure having a high rigidity itself defines the support surface of the processing apparatus. Therefore, the position of the processing apparatus supported by the support structure is determined with respect to the support surface defined by the support structure, not with respect to the housing that houses the processing apparatus. This causes a shift with respect to a relative position with respect to another apparatus accommodated in a housing that accommodates the processing apparatus.

  In the present embodiment, the rigidity of the support frame 300 is relatively low. Since the support frame 300 is along the support plate 160, the position of the exposure apparatus 200 relative to the photosensitive drum 410 in the housing 110 is appropriately determined.

  The support for the support frame 300 using the tongue pieces 329 and 339 and the vertical tongue pieces 321 and 331 is suitable for supporting the support frame 300 having a relatively low rigidity. As a result of the support frame 300 being supported at four or more points, the stability of the support frame 300 within the housing 110 is maintained.

(Connection between drive unit and exposure device)
FIG. 17 is a schematic perspective view showing the connection between the exposure apparatus 200 and the drive unit 335. FIG. 18 is a schematic perspective view of the drive unit 335. FIG. 19 is a schematic perspective view of the second frame plate 330 in which the drive unit 335 is incorporated. The connection between the exposure apparatus 200 and the drive unit 335 will be described with reference to FIGS. 5, 9 to 11, and 17 to 19.

  As shown in FIG. 19, the second frame plate 330 includes a frame metal plate 336 that supports the drive unit 335. The drive unit 335 includes an output gear 337 that meshes with the input gear 234 provided at the end of the screw shaft 231, and a transmission gear group (not shown) for transmitting the driving force from the drive motor 334 to the output gear 337. And a housing 338 for accommodating the transmission gear group.

  A substantially U-shaped notch 392 is formed in the frame metal plate 336. The housing 338 includes a support surface 391 that continues to the notch 392. The notch 392 and the support surface 391 form the notch 332 of the second frame plate 330 described above. The third boss 217 of the exposure apparatus 200 is supported by an arcuate support surface 391 that forms the contour of the notch 332. In the present embodiment, the support surface 391 is exemplified as an edge surface.

  The tolerance between the first boss 213 of the exposure apparatus 200 and the notch 326 formed in the first frame plate 320 and / or the first hole 251 of the fixed piece 250 and the second boss 214 of the exposure apparatus 200 and the first The tolerance between the notch 326 formed in the frame plate 320 and / or the second hole 252 of the fixed piece 250 is a slight difference of the exposure apparatus 200 with respect to the support frame 300 during the deformation of the support frame 300 described above. Allow displacement. The notch 332 (support surface 391) has an arcuate contour complementary to the arcuate peripheral surface of the third boss 217. While the exposure apparatus 200 is displaced with respect to the support frame 300, the support surface 391 supports the third boss 217 so as to be slidable.

  As shown in FIG. 11, the positional relationship between the input gear 234 and the third boss 217 is defined by the casing 210 of the exposure apparatus 200. Further, the positional relationship between the notch 332 and the output gear 337 is defined by the housing 338 of the drive unit 335. Therefore, the positional relationship between the input gear 234 and the output gear 337 is kept substantially constant while the third boss 217 is housed in the notch 332. Thus, even if the exposure apparatus 200 is displaced with respect to the support frame 300, the positional relationship between the input gear 234 and the output gear 337 is maintained appropriately.

  The principle of the above-described embodiment can be applied to apparatuses other than the image forming apparatus. In the above-described embodiment, the copying machine 100 is exemplified as a processing apparatus, and the exposure apparatus 200 is exemplified as a processing unit. Alternatively, instead of the exposure apparatus 200, another processing apparatus that performs a predetermined process may be used.

  The principle of the present embodiment is preferably applied to a processing apparatus that performs predetermined processing.

100... Copying machine (image forming apparatus: processing apparatus)
110... Casing 200... Exposure apparatus (processing unit)
210 ・ ・ ・ ・ ・ Case (container box)
217 ... Third boss (protruding part)
219 ... Window part 230 ... Cleaning part 234 ... Input gear (input element)
300 ... Support frame (support structure)
320 ... 1st frame board (frame element)
330 ... 2nd frame plate (drive side plate)
332... Notch 334... Drive motor (drive unit)
335... Drive unit (output element: drive unit)
340 ... Third frame plate (frame element)
350 ... 4th frame plate (frame element)
391 ... Support surface

Claims (6)

An exposure device that irradiates a charged image forming surface with light to form an electrostatic latent image; and
A support structure for supporting the exposure apparatus;
A housing for accommodating the exposure apparatus,
The support structure formed detachably with respect to the housing is connected to a drive side plate including a drive unit having an output element that outputs a drive force for driving the exposure apparatus, the drive side plate, A frame element that cooperates with the drive side plate to form the support structure;
The exposure apparatus includes a housing box that houses an optical element that scans the light, and an input element that receives the driving force from the driving unit.
The storage box includes a protruding portion that protrudes toward the driving side plate,
The driving side plate that is displaceable with respect to the frame element by its own weight includes an edge surface that forms an outline of a notch portion in which the protrusion is accommodated,
The edge surface supports the protrusion so as to be slidable.   The support structure supports the exposure apparatus so that the exposure apparatus is displaced with respect to the support structure when the driving side plate is displaced with respect to the frame element. The image forming apparatus described. The protrusion includes an arcuate peripheral surface,
The image forming apparatus according to claim 2, wherein the notch has an arcuate contour complementary to the arcuate peripheral surface of the protrusion.   4. The image forming apparatus according to claim 1, wherein the positional relationship between the notch and the output element is kept constant during the displacement of the driving side plate with respect to the frame element. 5. The storage box includes a window that transmits light toward the image forming surface,
The exposure apparatus includes a cleaning unit that cleans the window,
The image forming apparatus according to claim 1, wherein the driving unit drives the cleaning unit. A processing unit for performing predetermined processing;
A support structure for supporting the processing unit;
A housing for housing the processing unit,
The support structure formed detachably with respect to the housing is connected to a drive side plate including a drive unit having an output element that outputs a drive force for driving the processing unit, and the drive side plate, A frame element that cooperates with the drive side plate to form the support structure;
The processing unit includes a protruding portion that protrudes toward the driving side plate, and an input element that receives the driving force from the driving portion,
The driving side plate that is displaceable with respect to the frame element by its own weight includes an edge surface that forms an outline of a cutout portion in which the protrusion is accommodated.
The edge surface slidably supports the protruding portion.

Images