JP2009128410A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of inhibiting an image reader from sliding when a document holding member is open. <P>SOLUTION: The image forming apparatus comprises: an apparatus body 1 provided with an image recording section 2 for forming an image on a recording medium; an upper cover member 18 which covers the upper surface of the apparatus body 1 and is mounted openably and closably to the apparatus body 1; and a scanner 100 which is supported above the upper cover member 18 while forming a space between the upper cover member 18 and itself. The scanner 100 includes an openable/closable platen cover 110 which presses a document placed on a document placing section. The scanner 100 is provided with a means which is mounted so as to be movable almost along the face of the upper cover member 18 and inhibits slide movement of the scanner 100 when the platen cover 110 is open. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus such as a copying machine, a facsimile machine, a printer, or a multifunction machine having at least two functions.

  An apparatus in which the upper surface of an apparatus main body having an image forming unit is used as a sheet placement unit and an image reading device is provided with a certain distance from the upper surface of the apparatus main body is well known. Forming device.

  In this type of image forming apparatus, the protruding area from the apparatus main body is eliminated to reduce the installation area as much as possible. For this reason, the image reading unit is installed almost directly above the sheet placing unit to reduce the size of the apparatus. I am trying. Furthermore, in order to suppress the height of the apparatus, the distance between the upper surface of the apparatus main body and the image reading apparatus is set to the minimum necessary. If comprised in this way, there exists a problem that the sheet | seat taking-out property from a sheet | seat mounting part and the sheet | seat visibility of a sheet | seat mounting part are bad.

Japanese Patent No. 3176411

  Therefore, Patent Document 1 discloses that the image reading apparatus is slid with respect to the upper cover member in order to improve the sheet take-out property and visibility. With this configuration, the sheet take-out work space is expanded. Workability and visibility are improved.

  However, if the image reading apparatus is slidable with respect to the upper cover member, the image reading apparatus can be slid even when the platen cover as the document pressing member is open. In such a case, the platen cover suddenly moves due to vibration or momentum. There was a problem of closing or causing injury.

  In view of the above-described conventional circumstances, an object of the present invention is to provide an image forming apparatus capable of prohibiting sliding of the image reading apparatus when the document pressing member is opened.

  In order to solve the above-described problems, the present invention provides an apparatus main body provided with an image recording unit for recording an image on a sheet therein, and an upper cover member that covers the upper surface of the apparatus main body and is attached to the apparatus main body so as to be opened and closed. And an image reading device supported above the upper cover member with a space formed between the upper cover member, and the image reading device is a document placed on the document placement portion. In the image forming apparatus having a document pressing member that can be opened and closed, the image reading device is slidably mounted along the surface of the upper cover member, and the image reading device is opened when the document pressing member is opened. An image forming apparatus is provided, which is provided with means for prohibiting sliding movement.

  The present invention is effective when the slide of the image reading apparatus is locked at a plurality of positions, and the slide movement prohibiting means prohibits the slide movement of the image reading apparatus at all lock positions.

  Further, according to the present invention, the slide movement prohibiting means is formed on an engagement projection provided on the apparatus main body side and an engagement recess formed on the image reading apparatus side and engaged with the engagement projection. A long member that extends in the sliding direction and is longer than the slide width of the image reading device. When the document pressing member is opened, the long member is engaged with the engagement convex portion by the document pressing member. It is effective if the engagement recess is moved to a position not engaged with the engagement protrusion when the document pressing member is held in a position where it is engaged with the engagement recess and the document pressing member is closed.

Furthermore, the present invention is effective when the same number of engagement recesses as the number of slide locks are formed on the long member.
Furthermore, in the present invention, the long member rotates about an axis parallel to the sliding direction as a fulcrum, so that the position where the engaging convex portion engages with the engaging concave portion is related to the engaging concave portion. It is effective to move between positions where the convex portions are removed.

  Furthermore, according to the present invention, when the elongated member is biased with an elastic force that rotates the engagement recess in a direction to release from the engagement protrusion, and the document pressing member is opened, the elastic force It is effective when the long member is rotated to a position where the engaging convex portion engages with the engaging concave portion against the above.

Furthermore, the present invention is effective when the document pressing member is a pressure plate that presses the document placed on the document placement portion.
Furthermore, the present invention is effective when an automatic document feeder for feeding a document to the document placing portion is attached to the document pressing member.

  According to the present invention, in the position where the image reading device is slid and locked, the image reading device is prohibited from sliding when the document pressing member is released, and the document pressing member is closed or opened largely by vibration during sliding or the like. Can be prevented from falling.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an external perspective view of an image forming apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic longitudinal sectional view showing an example of the internal configuration of the image forming apparatus.

  The image forming apparatus shown in FIG. 1 and FIG. 2 is disposed almost at the center of the apparatus main body 1 and is disposed below the image recording unit 2 for forming an image on a sheet. An image reading unit (hereinafter also referred to as a “scanner”) including a sheet feeding unit 20 that feeds the sheet S and an image reading unit, which will be described later, as an upper unit disposed above the image recording unit 2 with a space therebetween. 100) and a sheet as a sheet discharge unit that discharges the sheet on which the image is formed by the image recording unit 2 from the front side (right side / front side in both figures) to the back side (left side / rear side in both figures). The sheet discharge unit 25, the sheet stacking unit 40 that is disposed above the image recording unit 2 and stacks sheets discharged from the sheet discharge unit 25 in the sheet discharge direction (sheet discharge direction) Xa, and the scanner 100 1 front-back direction (sheet discharge method And a support portion 51 for slidably supporting Xa and therewith opposite the direction Xb) of.

  The image forming apparatus according to the present embodiment is a tandem type color image forming apparatus with a scanner, and a cylinder discharge in which a predetermined space for discharging a sheet is formed between the sheet stacking unit 40 and the scanner 100. It is also a paper-type image forming apparatus.

  In FIG. 1 and the like, Y indicates the sheet width direction orthogonal to the sheet discharge direction Xa, the sheet discharge direction Xa is also the slide direction of the scanner 100, and Xb is the slide direction opposite to the slide direction Xa. is there.

  As shown in FIG. 2, the image recording unit 2 includes a plurality of drum-shaped photoconductors 3a, 3b, 3c, and 3d configured as image carriers, and each of the photoconductors 3a to 3d includes Different color toner images are formed. In the illustrated example, a yellow toner image, a cyan toner image, a magenta toner image, and a black toner image are formed on the surfaces of the photoreceptors 3a to 3d, respectively. The photoconductors 3a to 3d are arranged in parallel with each other at a predetermined interval, and an intermediate transfer belt 4 configured as an intermediate transfer body is arranged facing the lower portions of the photoconductors 3a to 3d. As the intermediate transfer member, a drum can be used, but in the illustrated example, an intermediate belt composed of an endless belt wound around a plurality of support rollers 5 and 6 and driven in the direction of the arrow (counterclockwise in FIG. 2). A transfer belt 4 is used.

  Since the configuration around each of the photoconductors 3a to 3d is the same, the photoconductor 3a on which the yellow toner image arranged on the rightmost side in FIG. 2 is formed will be described as a representative. That is, the photoconductor 3a includes a charging device 7 that uniformly charges the surface of the photoconductor 3a, and an optical scanning device (LSU) 8 that irradiates the surface of the photoconductor 3a with laser light. An exposure device, a developing device 9 that visualizes the electrostatic latent image formed on the surface of the photoconductor 3a by exposure, and a transfer device 10 that is disposed to face the photoconductor 3a via the intermediate transfer belt 4. A cleaning device 11 that removes and collects toner remaining on the surface of the photoreceptor 3a after being transferred to the intermediate transfer belt 4 is provided in this order.

  When image formation is started in such an image forming apparatus, the photoreceptor 3a is rotationally driven in the clockwise direction in FIG. 2, and at this time, the charging device 7 uniformly charges the surface of the photoreceptor 3 to a predetermined polarity. Next, the charged surface is irradiated with laser light based on image information from the optical scanning device 8, thereby forming an electrostatic latent image on the photoreceptor 3 a. The electrostatic latent image formed on the surface of the photoreceptor 3 a is visualized as a yellow toner image by the developing device 9, and the yellow toner image is transferred onto the intermediate transfer belt 4 by the transfer device 10.

  At the time of full color image formation, the above-described image forming operation is performed in the same manner on all the remaining photoconductors 3b to 3d, whereby yellow toner images, cyan toner images, and magenta toner images respectively formed on the respective photoconductors 3a to 3d. Then, the black toner image is sequentially superimposed and transferred onto the intermediate transfer belt 4. In the image forming apparatus, a secondary transfer roller 12 is disposed so as to face the support roller 6 with the intermediate transfer belt 4 interposed therebetween.

  On the other hand, a paper feed unit 20 disposed below the image recording unit 2 has a paper feed tray 21 serving as a sheet storage unit for stacking sheets S made of transfer paper or resin film, and a stack on the paper feed tray 21. A sheet feeding roller 22 that feeds the sheet S, a friction pad 23 as a separating unit that separates the multi-fed sheets into one sheet, a re-conveying path 24 that is used when forming a double-sided image, and the like are provided.

  The sheet S fed from the sheet feeding unit 20 is fed toward the registration roller 13 and is once abutted against the registration roller 13 whose leading end is stopped. As a result, after the oblique deviation of the leading edge of the sheet S is corrected and aligned, the registration roller 13 causes the color toner image formed on the intermediate transfer belt 4 to be sheeted at the secondary transfer portion provided with the secondary transfer roller 12. The rotation is resumed at a predetermined timing so as to coincide with the leading end portion of S, and the sheet S is sent out toward the secondary transfer portion.

  The sheet S on which the unfixed color toner image is transferred in the secondary transfer unit is sent to the fixing unit 14 composed of a fixing device, and after the unfixed color toner image is fixed by heating and pressing by the fixing unit 14. Then, the sheet is discharged to the sheet stacking unit 40 provided on the upper surface of the apparatus main body 1 through the sheet discharge unit 25. The transfer residual toner adhering to the surface of the intermediate transfer belt 4 after the color toner image is transferred is removed by a belt cleaner 15.

  As in the case of a general image reading apparatus, the scanner 100 is provided with a mechanism for setting an original on the upper part of the apparatus body and scanning an image of the original, and an original for pressing and holding the original. A platen cover 110 as a pressing member is provided. The platen cover 110 is configured to be rotatable / openable / closable around the hinge 111 with respect to the housing of the scanner 100. The platen cover 110 is integrally provided with an automatic document feeder (ADF) 120, and the scanner 100 reads both a document set manually and a document fed by the automatic document feeder 120. Can do. Further, the scanner 100 is supported via support portions 51 and 52, which will be described in detail later, with respect to the apparatus main body 1 disposed at the lower part.

  1 and 2, reference numeral 16 denotes a control panel for controlling operations of the scanner 100 and the image recording unit 2, and the side on which the control panel 16 is arranged is the front of the image forming apparatus. Therefore, in this image forming apparatus, the sheet discharge unit 25 is disposed on the front side of the apparatus main body 1, and the front surface on which the sheet discharged to the sheet stacking unit 40 is discharged from the front side to the rear side of the apparatus main body 1. It has a paper discharge type device configuration.

  An upper cover 18 serving as an upper cover member or a frame member that covers the image recording unit 2 is provided on the upper portion of the apparatus main body 1, and an upper surface portion of the upper cover 18 is used as a sheet stacking surface 41 of the sheet stacking unit 40. . The upper cover 18 is provided with support portions 51 and 52 that support the scanner 100. The support portions 51 and 52 of the present embodiment are disposed along the left and right side edges of the upper cover 18 to secure the sheet stacking portion 40 on the upper cover 18, and between the sheet placement portion and the scanner 100. A space is formed between them. Note that the support portions 51 and 52 are only on the left and right sides of the sheet stacking portion 40, and no support portion is provided on the rear end side of the upper cover 18. With this configuration, even if the long sheet is longer than the width in the front-rear direction of the sheet stacking surface 41 of the upper cover 18, a part of the sheet is hung to the rear side beyond the sheet stacking surface 41, and the long sheet is stored without any problem. can do. Furthermore, if the scanner 100 is above the sheet stacking unit 40, it is inevitable that the sheet stacking surface 41 becomes dark. However, since the rear end side support unit is not provided, daylighting can be obtained. Can alleviate that problem.

  Further, as shown in FIGS. 2 and 3, the upper cover 18 supports the optical scanning device 8 which is a part of the image recording unit 2 at the lower portion thereof, and is a rotation fulcrum provided on the rear end side of the device. 17 is configured to be openable upward. The upper cover 18 is locked to the apparatus main body 1 by a cover locking means 60 described later, and when the lock is released, the upper cover 18 can be rotated and opened and closed. As shown in FIG. 3, when the upper cover 18 is rotated counterclockwise about the rotation fulcrum 17 and opened, the scanner 100 and the lower optical scanning device 8 are interposed via the upper support portions 51 and 52. Are rotated together, and the image recording unit 2 can be accessed, so that maintenance and the like can be easily performed.

  In the present embodiment, each photoconductor 3 is configured as a process cartridge in which the charging device 7, the developing device 9, and the cleaning device 11 disposed around each of the photoconductors 3 are integrated, and thus configured. The four process cartridges can be taken out and attached for replacement or the like from the part where the upper cover 18 is opened.

Next, the scanner 100 will be described with reference to FIG.
In FIG. 4, a slit glass (first reading position) 101 and a contact glass (second reading position) 102 are provided on the upper surface of the scanner 100. Below the slit glass 101 and the contact glass 102, an exposure lamp 103 as an image reading means, a first mirror 104, and the like are mounted and provided on the optical moving module 130 shown in FIG. When reading a document placed on the contact glass 102, the first mirror 104 moves in the left-right direction in FIG. 4 below the contact glass 102 (first reading mode), and reads the document on the slit glass 101. In this case, after stopping under the slit glass 101 and reading the document surface by the exposure lamp 103 (second reading mode), the reflected light is passed through the first mirror 104 and a lens (not shown) as is well known. An image is formed on an imaging element such as a CCD.

  A platen cover 110 on the upper side of the scanner 100 is provided with a reflecting plate 112 on the lower surface thereof for pressing a document placed on the contact glass 102 against the contact glass 102 and serving as a white reference when reading the document. The platen cover 110 is connected to the scanner 100 via a hinge 111 as shown in FIG.

  The automatic document feeder 120 on the platen cover 110 is provided with a document placement table 121 on the top thereof, and a document bundle O composed of a plurality of documents is placed on the document placement table 121. ing. The document bundle O placed on the document placement table 121 is fed by a calling roller 122 that can be brought into contact with or separated from the document bundle O, and then separated by a separation belt 123 and a separation prevention roller 124. The separation belt 123 presses and contacts the separation prevention roller 124 at an arbitrary angle θ.

  The separation belt 123 is bridged between a drive roller 125 and a driven roller 126. Further, the driven roller 126 is urged by a spring 127, and a constant tension is applied to the separation belt 123 by the spring 127. A one-way clutch 128 is provided between the driving roller 125 and the shaft 125a, and the driving roller 125 is driven to rotate clockwise in FIG. In addition, the separation prevention roller 124 rotates in the clockwise direction in FIG. 4, and the uppermost original is separated from the original bundle O fed between the separation belt 123 and the separation prevention roller 124. The

  The original separated by the separation belt 123 and the separation prevention roller 124 is reversed along the reversing path 143 by the first conveying roller 141 and the driven roller 142 on the driving side, and is conveyed toward the slit glass 101. ing.

  The first conveying roller 141 and the driven roller 142 sandwich the separated document, convey it to the slit glass 101 through the reversing guide 144, and then convey it by scooping it up to the sheet discharging path 146 by the reversing discharging guide 145. It has become. A reflective guide plate 147 is provided on the slit glass 101, and this reflective guide plate 147 constitutes a white reference at the time of reading.

  The original conveyed to the paper discharge path 146 is nipped and conveyed by the second conveying roller (driving member) 148 and the driven roller (conveying member) 149 on the driving side, and then the paper discharging roller 150 on the driving side. The paper is sandwiched between the driven rollers 151 and discharged from the paper discharge path 146 to the platen cover 110. On the other hand, the reflection plate 112 of the platen cover 110 covering the contact glass 102 is provided on the lower surface of the pressure plate 113, and the pressure plate 113 presses the original placed on the contact glass 102 against the glass 102. It has become.

  Next, the operation will be described. When the original bundle O is placed on the original placement table 121 and the start switch (not shown) is pressed, the pressure plate 152 presses the original bundle O against the calling roller 122, thereby calling the calling roller. The original bundle is conveyed toward the separation belt 123 by 80. This original bundle O is transported onto the slit glass 101 along the reverse path 143 by the first transport roller 141 and the driven roller 142 after the uppermost document is separated by the separation belt 123 and the separation prevention roller 124. Thereafter, the document surface is read by the slit lamp 101 by the exposure lamp 103, the first mirror 104, and the like. The document that has been read is transported on the transport path 146 by the second transport roller 148 and the driven roller 149, and then discharged onto the platen cover 110 by the paper discharge roller 150 and the driven roller 151.

  When the image reading is performed without using the automatic document feeder 120, the platen cover 110 is opened, the document is placed on the contact glass 102, and a start button (not shown) is turned on to optically move. The module 130 operates to scan and move the exposure lamp 103, the first mirror 104, and the like.

  The above-described rotation / opening of the upper cover 18 swings and rises so that the rear end side of the sheet stacking surface 41 that lowers the lock of the cover lock means 60 and allows the upper cover 18 to be rotated / opened is downward. However, if the sheet is mistakenly rotated and released when the sheet is stocked on the sheet stacking surface 41, there is a problem that the stocked sheet falls to the rear side of the apparatus. That is, if the stocked sheet S is forgotten and the upper cover 18 is rotated, the problem is that the sheet S stocked on the sheet stacking surface 41 falls to the back side of the apparatus main body 1. This problem can be solved by providing the support portions 51 and 52 also on the rear end side of the upper cover 18, but in the case of a long sheet, the rear end support portion is hit and the stock is disturbed.

  Therefore, in the present embodiment, the operation unit 61 that releases the lock of the cover lock unit 60 and allows the upper cover 18 to be rotated and opened is positioned on the sheet stacking surface 41 and hidden by the stocked sheets S. Provided. The cover locking means 60 is integrally provided with an operation portion 61 operated by a user at substantially the center of a support shaft 62 and lock claws 63 that engage with protrusions 1a fixed to the apparatus body 1 at both ends. Yes. The support shaft 62 is rotatably supported by the upper cover 18, and a direction in which the lock claw 63 is always engaged with the protrusion 1 a by a torsion coil spring 64 (see FIG. 40) mounted around the support shaft 62. The turning power of is energized. The operation unit 61 of the cover lock means 60 is formed of a plate material having a surface that is on the same plane as the sheet stacking surface 41, so that the operation unit 61 can be put on the sheet stacking surface 41. A fan-shaped recess 44 shown in FIG. 1 is formed.

  As described above, when the upper cover 18 is opened, a hand is inserted through the recess 44 and the cover locking means 60 is lifted up against the urging force of the torsion coil spring 64 to lift the cover locking means 60. Rotates about the support shaft 62 in the clockwise direction, and the lock claw 63 comes off the projection 1a. Then, by lifting the operation unit 61 as it is, the upper cover 18 is opened counterclockwise as shown in FIG. The direction in which the upper cover 18 is opened is the same direction as the rotation / opening direction of the platen cover 110 with the automatic document feeder 120 described above, that is, the direction in which the front side is opened to information with the fulcrum on the back side of the apparatus as the center. It is.

  As described above, since the operation unit 61 of the cover lock means 60 that allows the upper cover 18 to swing and open / close is disposed on the sheet stacking surface 41 on which the sheets S are stocked, the sheet S is placed on the sheet stacking surface 41. In some states, the operation unit 61 is hidden by the sheet, so that the upper cover 18 can be reliably prevented from being rotated and opened.

  In the image forming apparatus in which the scanner 100 is disposed above the sheet placement unit 40, it is inevitable that the visibility and sheet take-out performance of the stocked sheets are deteriorated as compared with those without the scanner 100. Therefore, in the image forming apparatus of the present embodiment, as shown in FIGS. 1 and 2, between the scanner 100 accessing the sheet stacking unit 40 and the apparatus main body 1 in order to improve the deteriorated sheet visibility and sheet take-out performance. Since the front opening 42 that is the space is greatly opened toward the front, it is possible to prevent the take-out property of the sheet S discharged to the sheet stacking surface 41 from being deteriorated. In addition, the scanner 100 is slidably supported in the direction of arrow B parallel to the sheet discharge direction Xa in FIG. 2 by the two support portions 51 and 52, and the sheet discharge portion 25 is slid and moved to the back side. The front opening 42 formed in the space between the scanner 100 and the scanner 100 can be widened.

  Further, in order to improve the sheet visibility from the front opening 42 and the sheet take-out property, a first taper portion 137 is formed at the lower front corner of the scanner 100, and similarly, the control panel 16 of the apparatus main body 1 is formed. A second taper portion 19 is formed also above the front opening portion 42 to increase the opening area. In particular, the second tapered portion 19 in the present embodiment has a tapered shape so that the opening area is widened toward the outside of the opening, and it is easy to insert a hand into the opening when taking out the discharged sheet. It has become. This configuration may be provided in the first tapered portion 137, or may be any shape as long as the opening area of the front opening portion 42 is not limited to a tapered shape.

The take-out property of the discharged sheet S will be described.
6 and 7, the upper right portion of the sheet stacking portion 40 is formed with a notch 43 lower than the sheet stacking surface 41 to facilitate access to the sheet stacking surface 41. Has a surface inclined upward toward the upstream in the sheet discharge direction Xa. Thereby, in the case of a user with a large hand, it is possible to ensure a good takeout property not only from the front opening 42 but also from the side. Further, in the present embodiment, the cutout portion 43 is formed on the upper right side, but it goes without saying that the same effect can be obtained even if the cutout portion 43 is provided on the upper left side.

  Further, as clearly shown in FIG. 7, the left and right support portions 51 and 52 that support the scanner 100 are not bilaterally symmetric, and the right support portion 51 as viewed from the front corresponds to the cutout portion 43 in the depth direction. Is configured to be shorter than the length of the left support portion 52 in the depth direction. That is, if the length in the depth direction of the right support portion 51 is L1 as shown in FIG. 8, and the length in the depth direction of the left support portion 52 is L2 as shown in FIG. 1, the configuration is L1 <L2. Has been. Accordingly, the discharge sheet S can be easily taken out from the cutout portion 43 side, the daylighting from the cutout portion 43 side can be easily taken, and the discharge sheet visibility is also good. Regarding the strength of the support portions 51 and 52 in this case, there is no problem because the left support portion 52 on which the heavy weight side of the automatic document feeder 120 is arranged has a longer support width in the depth direction. .

  In the vicinity of the operation portion 61 of the cover lock means 60 on the sheet stacking surface 41, a recess 44 is provided for facilitating gripping of the operation portion 61 as described above. It has a shape that also serves as a finger insertion space for scooping out discharged sheets. In the case of FIG. 1 and FIG. 6, since the sheet is discharged at the center reference, the recess 44 is formed so as to be symmetric with respect to the center reference, and both ends of the recess 44 are formed by this apparatus. Since it is positioned so as to be larger than a predetermined width of the sheet to be handled, it is a finger insertion space where a postcard-sized sheet can be picked up.

  Further, the description of the cover lock means 60 will be supplemented. The operation unit 61 of the cover lock unit 60 is provided on an inclined surface so as to receive the sheets on the sheet stacking surface 41, and is provided so that the upper surface of the operation unit 61 does not protrude upward from the sheet stacking surface 41. ing. With this configuration, when the trailing edge of the discharged sheet slides down the inclined surface, it can be abutted against the operation unit 61 of the cover lock unit 60 and the sheet position can be prevented from being stacked apart. In order to obtain such an effect, in addition to the above-described configuration, the sheet trailing edge is positioned on the downstream side in the sheet discharging direction from the position where the sheet trailing edge lands on the sheet discharge tray surface, or the sheet falls by its own weight from the sheet discharge outlet. In such a case, the operation part 61 of the cover lock means 60 may be provided in the vicinity of the discharge port side.

  Since the operation unit 61 of the cover lock means 60 is provided on the inclined surface of the sheet stacking surface 41 which is also a paper discharge tray as is apparent from FIGS. 1 and 6, the visibility from the front of the apparatus is good. When the sheet is taken out from the front opening 42 at the front, the operation unit 61 of the cover lock means 60 can be visually recognized. Further, the operation unit 61 is located in front of the front end of the scanner 100. Thus, the visibility from the front of the apparatus is good, and when the sheet is taken out from the front opening 42 in front of the apparatus, the operation part 61 of the cover lock means 60 can be visually recognized.

  The image recording unit 2 and the scanner 100 (so that the sheet discharge direction Xa of the image recording unit 2 (from the front to the back of the apparatus) and the sub-scanning direction (document feeding direction) of the scanner 100 (automatic document feeder 120) are orthogonal to each other. An automatic document feeder 120). As shown in FIG. 2, the front surface of the apparatus main body 1 protrudes forward from the scanner 100 and the support portions 51 and 52, and the control panel 16 is arranged on the upper front surface of the apparatus main body 1. As a result, the front opening 42 can be sufficiently secured, and the visibility and operability of the operation unit 61 of the cover lock means 60 can be improved by discharging a short sheet from above.

  The internal configurations of the support portions 51 and 52 and the scanner 100 will be described in more detail in terms of sheet take-out properties, strength for supporting the scanner 100, and securing buffer properties. 8 to 11, the scanner 100 provided with the automatic document feeder 120 is arranged to face the left support 52 when the optical movement module 130 in the scanner is viewed from the front, and the automatic document feeder 120 is also a document. The conveyance turn portion is on the left side when viewed from the front of the apparatus, and the document placing tray and the document discharge tray are arranged to be opened to the right.

  The right support 51 is smaller than the left support 52 as viewed from the front of the apparatus. This is because the load of the scanner 100 is largely biased to the left due to the optical movement module 130 including the scanning unit and carriage constituting the scanner 100 being arranged on the left side. This is because the user's discharge handling from the surface is taken into consideration. That is, when viewed from the front of the apparatus, which receives a small load from the scanner 100, the right support 51 is formed small and the base of the support 51 is provided low.

  Such a configuration is intended for right-handed users and provides convenience for many users. Further, as shown in FIGS. 10 and 11, a drive motor 131 as a drive means and a drive transmission system including a gear train and the like are arranged as the drive system of the scanner 100 as viewed from the front of the apparatus. Is arranged. In the scanner 100, as described above in part, there is a scanning unit (not shown) that reads a set original, and a drive motor 131 that drives the scanning unit. The drive motor 131 transmits drive using a timing belt or the like to move the scanning unit.

  10 and 11, reference numeral 105 denotes a lower case as the housing of the scanner 100, and reference numeral 106 indicated by an alternate long and short dash line denotes a lower outer shape of the lower case 105 of the scanner 100 other than the lower protruding portion where the drive motor 131 is disposed. Each line is shown.

  Thus, a part of the left front end portion shown in both drawings of the scanner 100 protrudes downward from the upper surface of an opening 59 (see FIG. 14) described later. A drive motor 131 as a drive means is disposed at the left front end portion of the scanner 100 protruding downward from the upper surface of the opening 59.

  As described above, in the scanner 100 provided with the automatic document feeder 120, the left and right sides are not equal when viewed from the front of the apparatus, and the left side support part 52 is larger than the right side support part 51 as the support parts 51 and 52. The balance is set to be strong enough to withstand. For this reason, as shown in FIG. 8, the left support 52 is not only set to have a length in the depth direction of L2> L1, but also the width W2 of the left support 52 is the right support. It is set to be larger than the width W1 of 51 (W2> W1).

  As a result, the user can take out the discharged sheet significantly. In the support parts 51 and 52 configured as described above, the sheet placement part 40 is provided with a groove 46 in consideration of the sheet take-out property to further improve handling. Further improvement can be achieved by providing a rib or the like on the sheet discharge portion cover such as a protrusion in the groove 46.

  As shown in FIG. 12, the apparatus main body 1 has a front cover 27 that can be opened and closed via a hinge 28. By opening the front cover 27, the unit of the intermediate transfer belt 4 and the waste toner bottle TB and Replacement maintenance for the fixing device 14 and processing of jammed paper in the sheet conveyance path in the apparatus main body 1 can be performed.

  Further, as shown in FIG. 13, the apparatus main body 1 has an opening 29 for inserting the paper feed tray 21 in the front cover 27, and the paper feed tray 21 extends from the opening 29 in the horizontal direction of the figure (front side of the main body). From) is configured to be removable. FIG. 13 shows a state in which the paper feed tray 21, the friction pad 23, and the re-conveying path 24 are taken out from the apparatus body 1 in the P direction and detached. As a result, full front operation that allows maintenance, consumable replacement, jam handling, etc. from the front of the device body 1 is possible, and the space for performing the above-described work from the back is not required, the installation area can be reduced and the usability is good. A low-cost image forming apparatus can be provided.

Hereinafter, a slide mechanism and a lock mechanism between the scanner 100 and the support portions 51 and 52 will be described.
As described above, in FIG. 1 and FIG. 2, the discharge space between the scanner 100 and the apparatus main body 1 is greatly opened toward the front surface, so that the ejectability and visibility of the sheets discharged to the sheet stacking surface 41 can be obtained. Is excellent.

  However, when the size of the apparatus in the depth direction is reduced and the height is reduced, the size of the front opening 42 is also reduced, making it difficult to insert a hand into the paper discharge space, and the sheet is not in the scanner 100. Or hitting the sheet discharge section 25, the ease of taking out the sheet is sacrificed. For example, in FIG. 2, the scanner 100 protrudes rearward from the rear part of the image recording unit 2 and the apparatus main body 1, but when the rear part of the scanner 100 and the apparatus main body 1 are combined to reduce the size of the apparatus, the front opening 42. Becomes smaller. However, depending on the installation environment of the user, the ease of taking out the sheet is more important than the size of the apparatus. Also, the ease of taking out differs depending on the user, so the size of the front opening 42 can be adjusted. It is desirable that a plurality of moving positions can be selected, so that it is possible to provide usage conditions suitable for various users.

  Next, referring to FIGS. 14 to 16, left and right slide mechanisms are provided that serve as slide support portions that slidably support the scanner 100 in the front-rear direction of the apparatus body 1, that is, the sheet discharge direction or the slide directions Xa and Xb. The periphery of the support portions 51 and 52 will be described in detail.

  As shown in FIGS. 15 and 16, rail portions 133 and 134 as slidable contact portions are integrally formed on both the left and right sides of the scanner 100, and each rail portion 133 and 134 has a lower surface as a slidable contact surface. 133a, 134a and protrusions 133b, 134b are integrally formed. In the left side rail portion 133 in the drawing, a groove 133c extending long in the front-rear direction of the sheet discharge direction Xa is formed.

  As shown in FIGS. 14 to 16, in the scanner 100, the lower surfaces 133a and 134a of the rail portions 133 and 134 are slidable on the upper surfaces 51a and 52a as the sliding contact surfaces formed on the support portions 51 and 52, respectively. It is supported. The horizontal play of the scanner 100 is regulated by fitting with a predetermined gap between the two pins 55 protruding upward from the support portion 51 and the groove 133 c formed in the rail portion 133 of the scanner 100.

  The support portions 51 and 52 are integrally formed with U-shaped dropout prevention portions 53 and 54 and the upper surfaces 51a and 52a, respectively, on the outer sides thereof. The dropout prevention portions 53 and 54 formed on the support portions 51 and 52 are respectively fitted to the protrusions 133b and 134b of the protrusions formed on the rails 133 and 134 of the scanner 100 with a predetermined gap, so that the scanner 100 It prevents and regulates upward slipping, lifting, and backlash.

  In addition, while forming the slip prevention part inside each support part 51 and 52, and forming the protrusion part of a protrusion on the inside of the rails 133 and 134 of the scanner 100, the slip prevention part inside each support part 51 and 52 is formed. By fitting this part and the protrusions inside the rails 133 and 134 of the scanner 100 with a predetermined gap, the scanner 100 may be prevented from being pulled out and lifted or loosened.

  As described above, according to the example of the present embodiment, the rails 133 and 134 are integrally formed on the housing (case) of the scanner 100, and the lower surfaces 133 a and 134 a of the rails 133 and 134 are respectively supported by the support units. Since it slides with respect to the upper surfaces 51a and 52a of 51 and 52, an inexpensive slide mechanism can be achieved without adding parts. Further, sufficient strength can be imparted to the rail portions 133 and 134 and the scanner 100 itself from the cross-sectional shape of each rail portion 133 and 134.

Since the drop prevention portions 53 and 54 are integrally formed with the support portions 51 and 52, respectively, the upward removal of the scanner 100 can be prevented at low cost without increasing the number of parts.
Further, the drop prevention portions 53 and 54 receive a load on both the left and right sides of the support portions 51 and 52, so that the strength can be increased. Can be prevented.

  If the advantages and effects as described above are not desired, the same omission prevention portions 53 and 54 as those described above are disposed on the scanner (scanner 100) side, and the scanner 100 is disposed on the support portions 51 and 52 side. You may integrally form the sliding contact part which provided the sliding contact surface similar to the rail parts 133 and 134 on the upper surface.

  If the prevention portions are provided on both outer and inner sides with respect to the respective support portions, the space for arranging other components is reduced. Since it is necessary to arrange parts such as an opening / closing cushioning mechanism for the upper cover in the support portion, it is desirable that the support portion be a drop prevention portion that takes up as little space as possible.

  Therefore, according to the example of the present embodiment, the slip-off preventing portions 53 and 54 are disposed on either the outer side or the inner side of the right side support portion 51 and the left side support portion 52, so that a space is saved. In addition, it is possible to achieve a slip-out prevention portion that ensures strength.

  The drop prevention parts 53, 54 are divided into a drop prevention part 53a, 54a provided in front of the support parts 51, 52 and a drop prevention part 53b, 54b provided in the rear of the support parts 51, 52. Has been. As a result, when force is applied in front of the scanner 100, the force is received by the front removal prevention portions 53a and 54a, and when force is applied behind the scanner 100, the force is applied by the rear removal prevention portions 53b and 54b. Therefore, the upward lift can be reliably suppressed. In addition, other parts can be arranged in the space between the separation preventing portions arranged in a divided manner.

  In the example of the present embodiment, the slip prevention part is divided at the front and rear of the support part for the sake of space or mold configuration (for example, a slide core for injection molding). It may be provided. Further, the slip prevention portions 53 and 54 are formed in a box shape to increase the strength, and are further reinforced by ribs or the like. As a result, the strength of the drop prevention portions 53 and 54 can be increased, and when the user applies an upward force to the scanner 100, the drop prevention portions 53 and 54 are completely damaged or deformed. Disappear.

  Further, as shown in FIG. 17, a taper 53c is formed at each end portion of the divided prevention portions 53a, 54a, 53b, 54b in the slide direction Xb, and the scanner 100 is slid in the slide direction Xb. The rails 133 and 134 are not caught by the tips of the rails. As shown in FIG. 14, a taper 133 d is also formed at the ends of the rail portions 133 and 134 of the scanner 100. Thus, when the end portions of the slip prevention portions 53a, 54a, 53b, 54b and the tip ends of the rail portions 133, 134 of the scanner pass each other, it is possible to prevent the slide from being hindered due to the catching of both.

  As shown in FIG. 17, even when the scanner 100 is slid rearward in the slide direction Xa, the rail portions 133 and 134 of the scanner 100 are within the slidable range of the scanner 100, and the slip prevention portions in front of the support portions 51 and 52. The length L of the drop prevention part 53a is set so as to engage with 53a, 54a and the rear drop prevention parts 53b, 54b. As a result, no matter where the position of the scanner 100 is within the slidable range, the rail portions 133 and 134 are provided with the rail portions 133 and 134 in front of the support portions 51 and 52, and the rear portion prevention portions 53b and 54b. Therefore, the upward lifting of the scanner 100 can be surely prevented.

  When assembling the scanner 100 to the support portions 51 and 52, the rail portions 133 and 134 of the scanner 100 are inserted from the entrances 51b and 52b provided at the rear of the support portions 51 and 52 in FIGS. Slide and set forward (slide direction Xb). As shown in FIGS. 14 and 18, a notch groove 51c having the same length as the maximum slide stroke of the scanner 100 is formed in the right holding portion 51, and after the scanner 100 is inserted, the upper structure is formed. The upper cover 18 included in the body 26 is opened and the stepped screw pin 56 is screwed into the rail portion 134 of the scanner 100 while being fitted into the cutout groove 51c from the back side. The stepped screw pin 56 prevents the scanner 100 from falling off when sliding backward (sliding direction Xa). 18A shows an initial state in which the scanner 100 does not slide with respect to the support portions 51 and 52, and FIG. 18B shows an initial state in which the scanner 100 slides in the slide direction Xa with respect to the support portion 51. Each state is shown as slid by the maximum stroke. When the scanner 100 is removed from or removed from the support portions 51 and 52, the reverse operation sequence as described above, that is, the stepped screw pin 56 is first removed from the notch groove 51c. The step screw pin 56 is not limited to this, and may be a rivet, a stepped screw, or the like.

  The scanner 100 is prevented from slipping upward (hereinafter also simply referred to as “slip off”) by the slip prevention parts 53 and 54, and is also a slide direction Xa that is also a sheet discharge direction with respect to the support parts 51 and 52. It is configured to be detachable from the apparatus main body 1 and detachable from the rear side of the apparatus main body 1, and the stepped screw pin 56 prevents the scanner 100 from coming out from the rear side in the attaching / detaching direction.

  Therefore, according to the example of the present embodiment, even when the user applies a force in the upward direction or the sliding direction to the scanner 100, the scanner 100 is prevented from being detached from the support portions 51 and 52. In addition, a highly reliable image forming apparatus can be realized and provided. Further, since the scanner 100 can be easily attached and detached from the slide direction Xa, the assembling property of the scanner 100 is also good.

  As shown in FIG. 3, in consideration of safety, the automatic document feeder 120, a lock mechanism that prevents the upper structure 26 from being opened when the platen cover 110 is opened, and the upper structure 26 are opened. Two locking mechanisms, that is, a locking mechanism that prevents the automatic document feeder 120 and the platen cover 110 from being opened, are disposed behind the left support 52. The cable 51 that transmits the image signal of the scanner 100 to the electrical board (not shown) on the apparatus main body 1 side is arranged with a certain slack so that the cable for transmitting the image signal of the scanner 100 to the electrical board (not shown) on the opposite side of the support unit 51 on the opposite side. Has been.

  A cable for transmitting a drive control signal of the automatic document feeder 120 is also arranged with a certain slack behind the left support portion 52 and beside the two lock mechanisms described above. This is because the image signal of the scanner 100 and the drive control signal of the automatic document feeder 120 are divided by the left and right support portions 51 and 52 so that the image signal is not affected by noise. It is. And according to the example of this embodiment, since the scanner 100 can be attached or detached from the support parts 51 and 52 on the rear side of the apparatus, there is no fear that both cables are pinched when the scanner 100 is set.

  As described above, when the scanner 100 is configured to be slidable, it is necessary to lock the scanner 100 so that the scanner 100 does not move at a plurality of locations. For this reason, a lock mechanism for the scanner 100 is provided.

  The support unit that slidably supports the scanner 100 includes the two support units 51 and 52 as described above, and a scanner lock mechanism is provided on the left support unit 52 side. As shown in FIGS. 1 and 14, an operation button 70 is provided on the side surface of the support portion 52. FIG. 14 shows the inside of the support portion 52 where the operation buttons 70 are provided.

  As shown in FIGS. 14 and 19 to 21, the torsion coil spring 72 shown in FIGS. 20 and 21 is attached to the shaft portion 71 of the operation button 70, and the operation button 70 is always directed toward the outside of the apparatus. Energized. The operation button 70 is integrally formed with a hook shape 70 a and is engaged with a notch portion 135 formed in the rail portion 133 of the scanner 100 in a state where it is urged by the torsion coil spring 72. The slide of the scanner 100 is locked. On the other hand, when the operation button 70 exposed on the side surface of the support portion 52 is pushed against the urging force of the torsion coil spring 72, the engagement is released, and the scanner 100 can be slid. The notch 135 of the rail part 133 of the scanner 100 is plural (three in this example), and the scanner 100 can be locked at each position.

  As described above, the horizontal play of the scanner 100 is restricted by the fitting of the two pins 55 shown in FIG. 14 protruding from the support portion 52 and the groove 133c shown in FIG. As described above, since various functional members are arranged on the support portion 52 of the scanner 100, there is a limit in increasing the distance between the two pins 55. Further, in order to reduce the manufacturing cost, the pin 55 is a plastic member integrally formed with the sheet stacking portion 40 and the support portions 51 and 52, and the groove 133c is made of a plastic member integrally formed with the housing of the scanner 100. Therefore, there is a limit to the fitting accuracy, and it is easier to deform than metal. For this reason, even when the slide of the scanner 100 is locked, the scanner 100 has a backlash in the horizontal direction with respect to the support portions 51 and 52, and the right and left balance is poor. In addition, as each said plastic member, the mixed material etc. of a polycarbonate (PC) and polystyrene (PS) etc. are mentioned, for example, a flame retardant process etc. are suitably given so that it may meet a regulation by the area and country to use.

  In the example of the present embodiment, the horizontal support is reduced by providing another slide lock mechanism on the right support 51 as well. In this way, the lock mechanism provided on the left and right support portions 51 and 52 can take a sufficiently long distance with respect to the size of the apparatus main body, as will be described later, so that the influence of backlash can be minimized. .

  As shown in FIG. 22, a cylindrical lock member 80 having a conical head is always urged upward on the right support 51 by a compression spring 81, and is formed on a rail 134 of the scanner 100. The groove 136 is engaged. One end (upper end) of the compression spring 81 is engaged with the spring engagement portion at the lower end portion of the lock member 80, and the other end (lower end) is engaged with the spring engagement portion 51 d of the support portion 51. The operation button 70 of the left support 52 and the cylindrical lock member 80 are connected by a flexible wire 82 shown in FIG. The right end portion (on the support portion 51 side) of the wire 82 shown in FIG. 21 is bent at 90 degrees (right angle) from the back side to the front side of the paper surface in FIG. 21, and from the front side of the paper surface in FIG. The wire 82 is bent 90 degrees in the direction of the back side, and the wire 82 extends upward from the bottom in the drawing and is connected to a hook locking portion (right end portion in FIG. 21). Accordingly, the two lock mechanisms can be operated in conjunction with each other by pressing the operation button 70. Further, as shown in FIG. 21, the wire 82 includes grooves (not shown) provided on the back ribs of the upper cover 18 in the support portions 51 and 52 and the sheet stacking portion 40 integrated therewith, and the upper cover 18. It is guided so as not to be loosened by a guide 57a of a wire pressing member 57 attached to the back surface. By using the wire 82 to connect the left and right locks, the lock mechanism can be interlocked easily even with a complicated path and with a small number of parts.

When the lock mechanism is disposed on the support portions 51 and 52 protruding from the left and right with the sheet stacking portion 40 interposed therebetween as in the example of the present embodiment, it is effective because the operation needs to be transmitted through the U-shaped path. .
When the operation button 70 is pressed against the urging forces of the torsion coil spring 72 and the compression spring 81, the lock member 80 is pulled by the wire 82, so that the cylindrical lock member 80 is lowered and the groove of the scanner 100 is moved. The engagement with 136 is released. At this time, as shown in FIG. 23B, the lock member 80 does not completely come out of the groove 136, and the conical head is still in the state of being in the groove 136. When the scanner 100 is slid in this state, the groove 136 pushes the lock member 80 further downward, and a click feeling is generated. Further, since the click feeling also occurs when the depressed lock member 80 is engaged with the groove 136, the lock position can be sensibly recognized by the user.

  As described above, the upper structure 26 constituted by the scanner 100, the sheet stacking unit 40, and the upper cover 18 is rotated and opened so that the front is opened around the rotation fulcrum 17 which is a rotation shaft at the rear of the apparatus. It is opened so that consumables such as toner cartridges and periodic replacement parts such as transfer belts can be replaced. In the quadruple tandem color image forming apparatus of the illustrated example, when the process cartridges are arranged in a horizontal direction, the upper structure 26 needs to be rotated and opened about 90 ° in order to attach and detach the process cartridges from above. There is. In this state, if the slide lock operation button 70 is accidentally pressed to release the lock, the scanner 100 falls due to its own weight. In order to prevent this, the stopper 100 shown in FIGS. 14 and 18 is provided, so that the scanner 100 can be held without dropping or dropping from the support portions 51 and 52 of the apparatus main body 1. However, since there is a possibility that the scanner 100 may hit the user and be injured, it is necessary to prevent a fall due to an erroneous operation by the following method.

  That is, as shown in FIG. 21, in the vicinity of the operation button 70, there is a pendulum member 75 attached to the support portion 52 so as to be rotatable in the vertical direction. When the upper structure 26 is opened together with the upper cover 18, the pendulum member rotates by its own weight and moves on the movement path of the operation button 70. Therefore, in a state where the upper structure 26 is opened together with the upper cover 18, the operation button 70 hits the pendulum member 75 and cannot move to a position where the lock is released. Therefore, the scanner 100 falls by its own weight due to an erroneous operation by the user. This can be prevented.

Next, with reference to FIG. 14, FIG. 19, and FIG. 24 to FIG. 31, the opening formed in the vicinity of the end of the slide mechanism and the surroundings of the shielding member that shields the opening will be described.
As described above, the upper stopper of the scanner 100 is prevented from coming off at the left and right rail portions 133 and 134 and the left and right support portions 51 and 52 of the scanner 100 as shown in FIGS. However, the scanner 100 that is arranged and slid on the support portions 51 and 52 is concerned that a load from above may be applied when the user places a hand. 51 and 52 (hereinafter also referred to as “pedestal”) need to be long in the front-rear direction. In particular, the front side of the support portion 52 which is the right-handed user side is supported by making the upper surface 52a and the drop prevention portion 54 as far as possible.

  As a result, when the scanner 100 is slid rearward for the visibility of the sheet, the upper surface 52a on the front upper surface side of the pedestal (supporting portion) 52 and the removal preventing portion 54a are exposed. There is no problem as long as the upper surface is a flat surface. However, if a slip-preventing fitting shape is formed as a slide support portion (hereinafter also referred to as a “slider mechanism”), the upper surface 52a and the slip prevention portion 54a are It will be a safety issue.

  It is conceivable that only the front side of the pedestal (supporting portion) 52 is not formed with a retaining shape, but is a plane on which the scanner 100 is placed, but at that time, the plane is the upper surface 52a and the scanner 100 shown in FIG. It is necessary to set the surface to be in sliding contact with the lower surface 133a (hereinafter also referred to as “boundary surface”). Otherwise, the sliding contact surface that slides at the time of sliding will come out on the side surface or the front surface. If such a gap in the sliding direction appears as an exterior, entrainment occurs during sliding, which is also a safety issue.

  Here, consider aiming to reduce the size of the scanner 100. As described with reference to FIGS. 9 to 11, the scanner 100 includes a scanning unit (not shown) that reads a set document and a driving motor 131 that drives the scanning unit. 131 transmits the driving force via the timing belt 138 and the like to move the scanning unit.

  The thickness of the scanning unit is necessary in the range of the moving part, that is, in almost the entire region in the scanner 100, but since the drive motor 131 is fixed, only the portion where the drive motor 131 is installed needs to be high. Therefore, it is only necessary to protrude a part of the scanner 100 downward. However, if the position is above the sheet stacking surface 41, the scanner 100 may be caught by the sheet discharged at the time of paper discharge or the stacked sheet. Decreasing the distance to 41 leads to a decrease in sheet stack capacity. This problem can be solved by projecting the inside of the base (supporting portion) 52 outside the sheet discharge range (paper passing range).

  When considering miniaturization of the scanner 100 as described above, a part of the scanner 100 protrudes downward. When the protrusion is to be included in the pedestal (supporting portion) 52 while maintaining the boundary surface, the exterior for maintaining the boundary and the cavity for the internal protrusion accommodating portion are shown in FIGS. 14 and 19. The opening / step 59 (hereinafter simply referred to as “opening 59”) shown in FIG. In the present embodiment, the opening 59 is formed in the vicinity of the front end portion of the upper surface 52a of the slide support portion (slide mechanism) and the removal prevention portion 54a in the slide direction (sheet discharge direction) Xb. More specifically, the opening 59 includes a pair of left and right side walls 52c and 52d formed along the sliding directions Xa and Xb in the support portion 52 in the vicinity of the front end portion, and the sheet width direction Y in the support portion 52 in the vicinity of the front end portion. And is surrounded by three wall surfaces with the front wall 52e formed along. In this way, the vicinity of the front end portion of the support portion 52 is integrally formed by the pair of side walls 52c, 52d and the front wall 52e so that the strength of the support portion 52 and the strength of the separation preventing portion 54a need to be increased. Because.

  When the scanner 100 is slid forward, the opening 59 is likely to pinch a finger with the front wall of the scanner 100, which is a serious safety problem. Therefore, a member and a mechanism that selectively shields the opening 59 in conjunction with the slide of the scanner 100 are necessary so that the user cannot access the slide mechanism.

  24 to 31, an opening 59 formed in the support portion 52 near the front end portion is surrounded by three wall surfaces of the pair of left and right side walls 52 c and 52 d and the front wall 52 e in conjunction with the slide of the scanner 100. Displaceable between a first position to be closed (hereinafter also referred to as “shielding position”) and a second position (hereinafter also referred to as “standby position”) retracted from the first position (shielding position). The shielding member 90 as a member is shown.

  The shielding member 90 includes shaft portions 91a and 91b that are mainly pivoted and displaced, a first holding portion 93a that holds a torsion spring 98 as an elastic member shown in FIGS. 25 to 27, and a second holding portion 93b. And rocking restricting portions 94a, 94b, 94c for restricting their own rocking displacement, a torsion spring winding portion 95, a stopper portion 96, and shielding surfaces 92, 97 for shielding the opening 59. These are integrally formed of the same plastic material as described above.

  Between the shaft portions 91a and 91b of the shielding member 90, a torsion spring winding portion 95 around which the torsion spring 98 shown in FIGS. When the shielding member 90 is assembled to the front end portion of the support portion 52, one end side of the torsion spring 98 is sandwiched between the first holding portion 93a of the shielding member 90 and the second holding portion 93b having a key shape. The other end side of the torsion spring 98 is locked by a spring locking portion 58a formed on the bottom wall of the support portion 52 shown by a one-dot chain line in FIG. Thus, the torsional moment of the torsion spring 98 is transmitted to the shielding member 90.

  The shaft portions 91a and 91b are provided with oval cut portions formed with a width smaller than the diameter thereof, and part of the bearing portions 58b and 58c integrally formed on the support portion 52 side is the oval portion. An opening slightly larger than the width is formed upward of the apparatus. Accordingly, the shaft portions 91a and 91b of the shielding member 90 can be easily inserted from the circumferential direction into the opposing bearing portions 58b and 58c. At this time, the other end side 98 b of the torsion spring 98 is brought into contact with and locked with a spring locking portion 58 a formed on the bottom wall of the support portion 52.

  After the insertion of the shielding member 90 into the bearing portions 58b and 58c, the shaft portions 91a and 91b are swung in the forward direction of the apparatus with the shaft portions 91a and 91b as rocking centers, and are swung and displaced to the use range. A force in a direction that always occupies the shielding position (first position) is exerted on the shielding member 90 by the elastic force / biasing force of 98. Here, in order to prevent the shielding member 90 from returning to the assembly start position and the oval cut portion formed in the shaft portions 91a and 91b from coming off from the bearing portions 58b and 58c, a stopper portion 96 is provided. Yes. The stopper portion 96 is configured to bend in the direction of the rotation axis. When the shielding member 90 is oscillated and displaced with the shaft portions 91a and 91b as the oscillating centers, the oscillating restriction member provided on the support portion 52 is provided. Deflection comes into contact with the joint portion 58d, and it does not return when it has passed over the swing restricting engagement portion 58d. As a result, the oval cut portions in the shaft portions 91a and 91b do not return to the open portions of the bearing portions 58b and 58c, and the shielding member 90 is detached from the bearing portions 58b and 58c and separated from the opening 59. There is no. At this time, the standby angle of the shielding member 90 is equal to or greater than the actual use angle and equal to or less than the attachment angle, so that there is no problem in use.

Further, the shielding member 90 includes shielding surfaces 92 and 97 for selectively shielding the opening 59, and swing restricting portions 94a, 94b, and 94c for restricting the swinging. Do it.
The operation of the shielding member 90 accompanying the slide of the scanner 100 is as follows. A plate-like engaging portion 139 that protrudes downward is integrally formed on the bottom wall located in the vicinity of the drive motor 131 of the scanner 100. The engaging portion 139 is a kind of cam, and is set to have a contour shape that selectively slides and engages with the swing restricting portions 94 a and 94 c of the shielding member 90 within the sliding range of the scanner 100.

  The shielding member 90 is formed with a swing regulating surface 94a that abuts against an opposing member, that is, an engaging portion 139 provided in the scanner 100, and regulates its own swing displacement. As described above, the scanner 100 is assembled by sliding in the sliding direction Xb from the rear side of the apparatus. When the scanner 100 is slid in the sliding direction Xb against the urging force of the torsion spring 98, FIG. In the middle of the slide in the state shown in FIG. 29 (b) and FIG. 30 (a), the front end side of the engaging portion 139 of the scanner 100 comes into contact with the swing restricting portion 94a of the shielding member 90, and thereby the shaft portions 91a and 91b. The shielding member 90 is oscillated and displaced in the clockwise direction around the center. After the front end (front end) of the engaging portion 139 of the scanner 100 comes into contact with the swing restricting portion 94a of the shielding member 90, the rear end of the engaging portion 139 of the scanner 100 swings the shielding member 90. The shielding member 90 is oscillated and displaced in the clockwise direction while being in contact with the restricting portion 94a. When the scanner 100 slides to the foremost end surface of the support portion 52, the rear end portion of the engaging portion 139 of the scanner 100 is engaged and pressed with the swing restricting portion 94a of the shielding member 90, and the shielding member 90 is shown in FIG. 8. As shown in FIG. 29 (b) and FIG. 30 (a), the standby position is occupied.

  At this time, the back surface of the scanner 100 is equivalent to the back surface of the image recording unit 2, and the machine size is minimized. When packing is performed in a state where the shielding member 90 occupies the standby position in this way, since there are few irregularities, the packing material is not used in large quantities and the packing volume is small, so that the amount that can be transported at once by truck increases. Therefore, it can be said that it is environmentally friendly. Since the scanner 100 is attached by the stepped screw pin 56 (see FIG. 16) so as not to come off in the insertion direction / removal direction, the scanner 100 does not come off from the support portions 51 and 52.

  Next, an operation when the scanner 100 is slid rearward will be described. When the scanner 100 is slid in the slide direction Xa in order to improve the take-out property of the discharged paper, the scanner 100 is slid and moved to the position shown in FIG. Swing and displace to the shielding position inside. At this time, as shown in FIG. 30B and FIG. 31 in an enlarged manner, only the lower projecting surface at the rear end and the swing restricting portion 94c of the shielding member 90 in the engagement portion 139 of the scanner 100 are engaged. Each contour shape is set so as to be slidably contacted, and the right front end protruding surface in the drawing of the engaging portion 139 and the swing restricting portion 94a of the shielding member 90 are in a non-contact state. At this time, only the shielding surface 92 shown in FIG. 22 and the like appears as an exterior, and the opening 59 is almost completely blocked by the shielding surface 92.

  In other words, the shielding member 90 includes the shielding surface 97 that is a surface perpendicular to the swing displacement direction, but it can be said that the shielding member 97 is configured not to be exposed to the opening 59. Thereby, since there is no possibility that the user touches the shielding surface 97 and is pushed in the swing displacement direction, it is possible to maintain the shielding effect by the shielding member 90 and to prevent the shielding member 90 from being damaged.

  That is, the shape of the shielding surface 92 that closes the opening 59 in the shielding member 90 is mainly a cylindrical surface having shaft portions 91a and 91b that are the same axis as the central axis of oscillation. Accordingly, the gap between the opening 59 formed in the vicinity of the front end portion of the support portion 52 that accommodates the shielding member 90 is not greatly opened, and the gap is not increased during the swinging. In order to prevent the clip or the like from dropping, it is desirable that the shielding surface 92 is formed of a curved surface formed of a continuous circumference with the clearance from the opening 59 kept at 1 mm or less at each slide position.

The shape of the shielding surface 92 is not limited to a cylindrical surface, but may be a spherical surface having shaft portions 91a and 91b that are the same axis as the central axis of oscillation.
Further, the shielding surface 97 has the same shape as the front wall of the scanner 100, and in a position slid in the rearward sliding direction Xa, it is counterclockwise about the shaft portions 91a and 91b by the urging force of the torsion spring 98. It is swung and pushed up and hits the front wall of the scanner 100. As a result, the gaps between the pair of side walls 52c, 52d, the front wall 52e, and the opening 59 in the vicinity of the front end portion of the support portion 52 are minimized, and there is no possibility that the user may pinch fingers or the like, thereby ensuring safety. In addition, the clip can be prevented from dropping.

  When the shielding surface 92 of the shielding member 90 is swung and raised only by the pushing-up / biasing force of the torsion spring 98, the user pushes in the shielding member 90 to insert a finger or create a gap. Can cause objects to fall into the equipment. Therefore, in the present embodiment, the swing restricting portion 94c shown in FIGS. 24 and 30 (b) abuts against the rear end surface of the engaging portion 139 of the scanner 100, so that even if the shielding surface 92 is pushed by the user, the opening is opened. The structure is not. At this time, the swing restricting portion 94c functions as a push-in preventing portion that does not displace itself even when the shielding surface 92 is pushed when the shielding member 90 occupies the shielding position. It can be said that the swing restricting portion 94c as the push-in preventing portion also serves as a displacement restricting portion that restricts its own swing displacement by selectively engaging with an engaging portion 139 provided in the scanner 100.

  Here, although the shape of the shielding surfaces 92 and 97 in the shielding member 90 was described in detail, the shape is not limited to this. For example, if the strength is acceptable, the front wall 52e of the support portion 52 may be removed and a shape corresponding to this may be formed on the shielding member side. The above configuration is suitable for use when the slide fixing position is fixed, but for example, the same effect can be obtained with a planar shape that is the same surface as the slide surface, and the opening can be shielded regardless of the slide position. .

  Further, if there is little backlash in the slide configuration, the accuracy of the engaging portion 139 of the scanner 100 and the swing restricting portion 94c of the shielding member 90 can be improved, so that even if the torsion spring 98 is not provided, FIG. It is possible to hold and hold the gap at the shielding position.

  By the way, the upper cover 18 is configured to be able to open upward with the rotation fulcrum 17 as a center. When the upper cover 18 is rotated about the rotation fulcrum 17 as shown in FIG. 3 by operating the operation unit 61 of the cover lock means 60, the upper cover 18 and the lower light through the support units 51 and 52 are connected. The scanning device 8 is rotated together. As described above, the inside of the apparatus main body 1 appears, and each unit for image formation can be accessed from the front, and maintenance and the like can be easily performed.

  When the upper cover 18 is rotated, since the axis of the rotation support shaft 17 of the upper cover 18 and the hinge 111 of the platen cover 110 are parallel, the platen cover 110 also rotates simultaneously with the opening of the upper cover 18. There is a risk of being.

Therefore, the image forming apparatus according to the present embodiment is provided with a lock unit 170 that prevents the platen cover 110 from being opened carelessly even when the upper cover 18 is opened.
32 to 37, the lock means 170 operates a lock member 171 that is engaged with an engagement portion 140 provided on the platen cover 110, a lock intermediate member 175 that moves the lock member 171 and the lock intermediate member 175. And an actuating member 178.

  The lock member 171 is supported by the scanner 100 so as to be rotatable about a rotation fulcrum 172, and a lock claw 173 that can be engaged with and disengaged from the locking portion 140 is formed at an upper end that is one end of the lock member 171. Further, an operating piece 174 is provided at the opposite end of the lock claw 173 across the rotation fulcrum 172.

  The lock intermediate member 175 is formed of a strip-shaped plate material, and is provided with a support shaft 176 along one side in the longitudinal direction thereof. The lock intermediate member 175 is rotatably supported by the scanner 100 via the support shaft 176. Further, an operating pin 177 protruding upward is provided at one end on the other side in the longitudinal direction of the lock intermediate member 175, and this operating pin 177 is in contact with the operating piece 174 of the lock member 171. The lock member 171 is biased by a spring 171a in the direction in which the operating piece 174 comes into contact with the operating pin 177 about the rotation fulcrum 172. With this configuration, the contact of the operating pin 177 with the operating piece 174 is guaranteed.

  The lock intermediate member 175 rotates about the support shaft 176, and the tip end side of the lock intermediate member 175 is seated on a cam shape 179 formed on the operating member 178 by its own weight. As shown in FIGS. 32 to 38, the actuating member 178 has one end rotatably attached to the upper cover 18 via a shaft 180, and the other end 181 moves along a rail 182 provided in the apparatus main body 1. It is provided as possible. The cam shape 179 is formed on a substantially concentric circle of the shaft 180.

  FIG. 39 is a partially enlarged view of the left side when viewed from the front of the apparatus in the state shown in FIG. First, in the upper cover 18, a pair of left and right upper frames 45 are attached to both sides of the optical scanning device 8. Both end portions of the rotation support shaft 17 are passed through the upper frame 45. The rotation support shaft 17 is supported by the apparatus body 1 along the upper edge on the back side of the apparatus body 1. As a result, the upper structure 26 (upper cover 18, scanner 100) is attached to the apparatus main body 1 so as to be openable and closable around the rotation support shaft 17, and opens oppositely based on gravity when opened beyond the reversal angle. In response to the moment in the direction, the upper structure is opened and the image recording unit 2 is opened to the outside. In addition, one end is hung on the apparatus main body 1 side and the other end is hung on the upper structure side at both end portions of the rotation support shaft 17 projecting left and right from the upper frame 45, so that the upper structure is opened. A rotating shaft spring 47 made of a torsion spring or the like is provided as a biasing member for biasing.

  The normal state in which the upper cover 18 is closed is a state in which the protruding portion of the cam shape 179 shown in FIGS. 32 to 34 is in contact with the lock intermediate member 175. At this time, the lock intermediate member 175 is supported by The lock member 171 is tilted upward with the shaft 176 as the center, and the lock claw 173 of the lock member 171 is detached from the engaging portion 140. Therefore, the platen cover 110 can be freely opened.

  Here, when the upper cover 18 is opened upward about the rotation fulcrum 17 due to process cartridge replacement or the like, the other end of the operating member 178 moves along the rail 182 as shown in FIG. get up. At this time, the actuating member 178 rotates about the shaft 180 in the clockwise direction of FIG. 38, the protruding portion of the cam shape 179 moves away from the lock intermediate member 175, and the circular portion contacts. Then, the lock intermediate member 175 rotates clockwise around the support shaft 176, and accordingly, the lock member 171 rotates counterclockwise around the rotation fulcrum 172, and the lock claw 173 engages with the locking portion 140. The platen cover 110 shown in FIGS. 35 to 37 is locked.

  Thus, when the upper cover 18 is opened, the platen cover 110 of the scanner 100 is locked in conjunction with the opening operation. Therefore, even if the upper cover 18 and the platen cover 110 of the scanner 100 are both opened from the front side, that is, the front side of the apparatus so as to be opened via the rear pivot point, Opening prevents the platen cover 110 from being opened. Therefore, problems such as breakage of the upper cover 18 due to unexpected opening of the platen cover 110 can be solved.

  As described above, the scanner 100 allows the sheet discharge unit 25 and the scanner 100 to improve the sheet visibility from the sheet placement unit 41 even for a user with large sheet visibility and a large hand. It is slidable to widen the interval. Therefore, the locking means 170 is also configured to lock the platen cover 110 at all the slide positions of the scanner 100. 38A shows the position where the scanner 100 is close to the sheet discharge section 25, and FIG. 38B shows the position where the scanner 100 is moved away from the sheet discharge section 25, and the cam shape 179 of the actuating member 178 is locked at both positions. It is in contact with the intermediate member 175. That is, the width of the lock intermediate member 175 in the longitudinal direction is set to be longer than the slide width of the scanner 100, and the operation member 178 is provided at a position where it does not come off the lock intermediate member 175 in the entire slide region of the scanner 100. Therefore, since the lock intermediate member 175 and the cam shape 179 of the operating member 178 are always in contact with each other, the lock unit 170 can lock the platen cover 110 without regard to the position of the scanner 100.

  When the lock intermediate member 175 is rotated about the support shaft 176, the surface thereof is inclined upward as shown in FIGS. 32 to 34 and the substantially horizontal position shown in FIGS. 32 to 34, the cam shape 179 is abutted and held at the position shown in FIGS. 32 to 34. However, at the horizontal position shown in FIGS. A stopper (not shown) is provided on the scanner case to prevent this. Therefore, the lock intermediate member 175 may touch the cam shape 179 of the actuating member 178 at a substantially horizontal position shown in FIGS. Further, when the stopper is provided, the lock intermediate member 175 does not protrude downward from the lower surface of the scanner 100, which is a sliding surface, so that it is prevented that smooth sliding cannot be performed by protruding from the sliding surface.

  In the above-described embodiment, it is possible to prevent the platen cover 110 from being opened by opening the upper cover 18 without questioning the position of the scanner 100, that is, to which position the scanner 100 is slid, but the platen cover 110 is opened. It is impossible to prevent the upper cover 18 from being accidentally opened.

In view of this, the image forming apparatus is provided with a lock mechanism that prevents the upper cover member 18 from being opened when the platen cover 110 is in an open state, which will be described next.
40 to 42, one end of the relay lever 265 is fixed to the left end of the support shaft 62 of the cover lock means 60. When the support shaft 62 is rotated by the operation of the operation unit 61, the relay lever 265 is also rotated. A pin 267 attached to one end of a slide member 266 that slides in the front-rear direction of the apparatus is in contact with the other end of the relay lever 265. The slide member 266 is a long lever member that extends from the front to the rear of the sheet mounting portion 40, and a long hole 268 extending in the extending direction is formed slightly rearward from the center of the slide member 266. A guide roller 43 attached to a bracket 42 provided on the cover member 18 is fitted, and the slide direction and slide width of the slide member 266 are regulated by this configuration. A tension spring 269 is provided between the bracket 42 and the slide member 266 to constantly bias the slide force to the slide member 266 backward. As shown in FIG. 43, the slide member 266 is held by the spring 269 at a position where the rear end of the slide member 266 hits the frame of the upper cover member 18. When the operation unit 61 is rotated, the relay lever 265 is engaged with the pin 267 and the slide member 266 is pulled toward the front side of the apparatus. When the hand is released from the operation unit 61, the spring 269 causes the slide member 266 to return to the position shown in FIG. In consideration of component tolerances and assembly errors, it is preferable that the pin 267 and the relay lever 265 have a slight gap when the upper cover member 18 is closed. With such a configuration, the rear end of the slide member 266 can be reliably abutted against the frame of the upper cover member 18 without the slide member 266 being obstructed by the relay lever 265.

  At the rear end of the slide member 266, that is, the end opposite to the end where the pin 267 is provided, an engaging convex portion 270 protruding upward to engage with an unlocking member 271 described later is formed. The unlocking member 271 is formed in a strip shape having a thickness, and is attached to the scanner 100 so as to be rotatable around a rotation fulcrum 273 provided on one side of the short direction in the longitudinal direction. The lock release member 271 is formed with an engagement recess 272 having a rectangular cross section with which the engagement protrusion 270 is engaged. In the present embodiment, three engagement recesses 272 are provided.

  The rotation width of the unlocking member 271 is such that the engagement convex portion 270 shown in FIG. 44A engages with the engagement concave portion 272 and the engagement convex portion 270 shown in FIG. It is regulated by a stopper (not shown) so as to be able to swing between the unlocked position where it is not engaged away from the recess 272. The unlocking member 271 is biased by a spring 274 about the rotation fulcrum 273 to the unlocking position where the engaging projection 270 does not engage the engaging recess 272. The lock release member 271 is swung between the lock position and the lock release position by the foot 276 of the operation member 275 that is operated by opening and closing the platen cover 110 that contacts the rear end. The actuating member 275 is mounted on the scanner 100 so as to be rotatable about a fulcrum 277, and when the platen cover 110 is open as shown in FIGS. 45 (a) and 42, the actuating member 275 is in a free state. Yes, the leg 276 is held in a locked position where it hits the unlocking member 271 by a spring (not shown). That is, the spring of the actuating member 275 and the spring 274 of the unlocking member 271 urge the actuating members 275 and the unlocking member 271 in opposite directions, but the spring of the actuating member 275 is unlocked. By overcoming the spring 274 of the member 271, the unlocking member 271 is held in the locked position when the actuating member 275 is free. When the platen cover 110 is closed, the actuating member 275 rotates counterclockwise around the fulcrum 277 from the state shown in FIGS. By this rotation, the foot 276 of the actuating member 275 moves in a direction away from the unlocking member 271, and the unlocking member 271 is moved by the spring force of the spring 274 as shown in FIGS. 41 and 45 (b). The engagement concave portion 272 is detached from the engagement convex portion 270 by rotating clockwise around the rotation fulcrum 273.

  Thus, when the platen cover 110 is open, the engaging convex portion 270 is fitted in the engaging concave portion 272, so that the operation portion 61 is rotated about the support shaft 62 to open the upper cover member 18. Also, the slide member 266 cannot be slid. Therefore, when the platen cover 110 is open, the opening of the upper cover member 18 is prevented by not moving the operation unit 61. In addition, when the platen cover 110 is closed, the engagement recess 272 is removed from the engagement projection 270 by the rotation of the lock release member 271, so that the slide member 266 can be slid. The operation unit 61 can rotate about the support shaft 62, and the upper cover member 18 can be opened when the platen cover 110 is closed.

  46 is a cross-sectional view of the support portion 52 as seen from the front of the apparatus, showing the positional relationship between the lock mechanism 170 that prevents the upper cover member 18 from being opened when the platen cover 110 is opened, and the lock means 170. FIG. FIG. 47 is a rear view of the scanner 100 showing the arrangement relationship.

  Within the width of the upper cover member 18, there are an engagement projection 270 that engages with an engagement recess 272 of the unlocking member 271, a slide member 266, an operation member 178 that engages with the lock intermediate member 175, and a cam shape 179. Are provided in the left-right direction. The slide member 266 is provided in the front-rear direction of the apparatus along the surface of the sheet placement portion 40 of the upper cover member 18.

  On the other hand, the scanner 100 includes an unlocking member 271 and an engaging recess 272 that engage with the engaging convex portion 270, and a lock intermediate member 175 that engages with the cam shape 179 of the operating member 178 and can rotate. It arrange | positions so that it may not mutually interfere in the left-right direction.

  Here, as described with reference to FIG. 45, the unlocking member 271 can be rotated counterclockwise and is not engaged with the unlocking member 271 in the same manner as described with reference to FIG. ing. That is, the lock can be released by the operation unit 61 and the upper cover member 18 can be opened.

  On the other hand, the lock intermediate member 175 is tilted in the clockwise direction in the upper right view by contacting the cam shape 179, as in the state described in FIG. The state retracted from the hole is shown. That is, the automatic document feeder 120 can be opened.

FIG. 48 shows the first support 50 viewed from above the apparatus in the state shown in FIG.
As is clear from FIG. 48, the intermediate lock member 175 and the lock release member 271 are rotatably provided in the left and right directions inside the leg portion of the scanner 100 slidably provided within the width of the support portion 52. ing. The lock member 171 and the actuating member 275 are located behind the rear end of the apparatus main body 1 and are provided inside the scanner 100. Further, the locking portion 140 is provided on the platen cover 110 as shown in FIG. 47. When the locking portion 140 is closed with respect to the scanner 100, as shown in FIG. 46, it straddles the operating member 175 and the lock member 171. To position.

  Therefore, the locking portion 140 prohibits / permits the opening of the platen cover 110 by engaging / disengaging with the lock member 171 and the opening of the upper cover member 18 by engaging / disengaging with the operating member 275. It has both functions that are permitted and prohibited.

  By the way, when the platen cover 110 is opened, as shown in FIGS. 42, 44 (a) and 45 (a), when the engaging convex portion 270 is fitted to the engaging concave portion 272, As described above, the upper cover member 18 cannot be opened, and the scanner 100 cannot be slid. That is, since the slide member 266 on which the engaging convex portion 270 is formed is provided on the apparatus main body 1 and the unlocking member 271 on which the engaging convex portion 270 is formed is provided on the scanner 100, the operation button 70 is provided. Even if the above-described scanner lock mechanism is released by pushing and the scanner 100 is slid, the engaging convex portion 270 hits the engaging concave portion 272 and cannot move. However, as shown in FIGS. 41, 44 (b) and 45 (b), when the engaging convex portion 270 is detached from the engaging concave portion 272, the scanner 100 can be slid, and the operation button 70 is pressed to scan the scanner. If the lock mechanism is released, the scanner 100 can be slid. In addition, the engaging convex part 270 is formed in a taper whose width becomes narrower as the edge on the distal end side of the slide member 266, that is, the back side as viewed from the front, is directed upward. Thus, by tapering one side in the width direction of the engaging convex portion 270, the platen cover 110 can be assembled later at the time of assembling the scanner, and the assembling property is improved. However, if the taper angle is too low, the lock release member 271 is lifted by the taper of the engaging convex portion 270 when the scanner 100 is slid even when the engaging convex portion 270 is engaged with the engaging concave portion 272. Since the slide of the scanner 100 cannot be prohibited by coming off the engagement recess 272, the angle needs to be set in consideration of the assembling property and the slide prohibition.

  As described above, the lock mechanism that prevents the upper cover member 18 from being opened when the platen cover 110 is in the open state is also configured as a means for prohibiting the slide movement of the scanner 100 when the platen cover 110 is open.

  By the way, even if an attempt is made to press a thick original BO such as a book-type original as shown in FIG. Therefore, it is already known that the entire platen cover 110 can be translated in the vertical direction, that is, in the direction of coming into contact with and away from the platen (not shown) via the hinge portion. FIG. 50 is a perspective view showing an example. The hinge portion 190 of the platen cover 110 is fitted into a hole 191 formed in the main body of the scanner 100. In the case of a thick original BO such as a book-type original, the platen cover 110 is shown. The hinge portion 190 can move in the vertical direction along the hole 191, so that the entire platen cover 110 can be pressed after being lifted from the platen.

  Even when the platen cover 110 is lifted, if the upper cover member 18 is opened and the platen cover 110 is also rotated in the same direction, the platen cover 110 may come off the main body of the scanner 100. To do.

Therefore, as shown in FIG. 49, when the platen cover 31 is lifted and the book-type document BO is pressed, the locking portion 140 does not come into contact with the operating member 275, so that the lock release member 271 is held in the locked position. Therefore, when the platen cover 110 is lifted, the upper cover member 18 is prevented from being opened as in the case where the platen cover 110 is opened.
Furthermore, since the unlocking member 271 is held at the locked position when the platen cover 110 is lifted, the sliding movement of the scanner 100 is also prohibited.

1 is an external perspective view of an image forming apparatus showing an embodiment of the present invention as viewed obliquely from the upper left. FIG. 2 is a schematic longitudinal sectional view showing an example of the internal configuration of the image forming apparatus of FIG. 1 on the apparatus main body side. FIG. 2 is an external perspective view showing a state where an upper structure including an upper cover of the image forming apparatus in FIG. 1 is opened. FIG. 2 is a schematic vertical sectional view illustrating a configuration of a scanner of the image forming apparatus in FIG. 1. FIG. 2 is an external perspective view showing a state in which a platen cover of the image forming apparatus in FIG. 1 is opened. FIG. 2 is an external perspective view of the image forming apparatus of FIG. FIG. 2 is an external perspective view of the image forming apparatus of FIG. 1 viewed from the right side. FIG. 2 is a simplified plan view showing left and right support portions in the image forming apparatus of FIG. 1. FIG. 2 is a perspective view illustrating an internal configuration of a scanner of the image forming apparatus in FIG. 1. It is sectional drawing of the principal part which shows the engagement state of the engaging part of a scanner, and the rocking | fluctuation regulation part of a shielding member when a scanner is located in the forefront end of a support part. It is a top view of the principal part which shows the arrangement state of the drive motor in a scanner when a scanner is located in the forefront end of a support part. It is a simplified front view showing an example in which the front cover can be opened and closed from the apparatus main body. It is a simplified front view which shows the example which comprised the front cover so that attachment or detachment was possible from an apparatus main body. It is an external appearance perspective view around a support part on either side and a fall prevention part. It is the front view which looked at the scanner from the front side. It is sectional drawing of the principal part which shows the slide fitting state of the rail part of a scanner, and the left side prevention part. It is sectional drawing of the fall prevention part in the right support part. (A) is a sectional view showing an initial state where the scanner is not slid with respect to the support part, and (b) is a cross-sectional view showing a state where the scanner is slid with respect to the support part in the sliding direction by the maximum stroke, It is sectional drawing explaining the removal prevention part of the attachment or detachment direction of a scanner. It is a perspective view which shows the scanner lock mechanism of one support part. It is a perspective view which shows the principal part of the locking mechanism of FIG. It is a top view which partially fractures and shows the lock | rock interlocking | linkage mechanism of a right-and-left support part. It is sectional drawing of the principal part which shows the scanner lock mechanism of the other support part. (A), (b), (c) is sectional drawing which shows the engagement and transition state of a locking member and a groove | channel. It is a perspective view which shows the external appearance shape of a shielding member. It is a simple exploded perspective view explaining the state which attaches a shielding member to the left bearing part of the left support part. It is a simple exploded perspective view explaining the state which attaches a shielding member to the right bearing part of the left support part. It is a simple exploded perspective view explaining the state which attaches a shielding member to the left and right bearing parts of the left support part. It is a top view explaining the state which attached the shielding member to the left support part. (A) is a front view when the scanner is slid to the rear, and (b) is a front view explaining the vicinity of the front end of the support portion and the swinging displacement state of the shielding member when the scanner is slid forward. . (A) illustrates the state of engagement between the scanner engaging portion and the shielding member swing restricting portion when the scanner is slid forward, and (b) is when the scanner is slid forward. It is sectional drawing of the principal part to do. It is an expanded sectional view of the C section in Drawing 30 (b). It is the perspective view seen from one side which shows the locking means at the time of lock release of a scanner. It is the perspective view seen from the other which shows the locking means at the time of unlocking of a scanner. It is sectional drawing seen from the apparatus front which shows the locking means at the time of lock release of a scanner. It is the perspective view seen from one side which shows the locking means at the time of locking of a scanner. It is the perspective view seen from the other which shows the locking means at the time of locking of a scanner. It is sectional drawing seen from the apparatus front which shows the locking means at the time of locking of a scanner. (A). FIG. 5B is a cross-sectional view showing the locking means when the scanner is slid forward when the scanner is locked. It is the perspective view which expanded the left side part seeing from the apparatus front of the state shown in FIG. It is a perspective view which shows the arrangement | positioning relationship of the lock mechanism which prevents opening | release of an upper cover member. It is a perspective view which shows the lock release state of a lock mechanism. It is a perspective view which shows the locked state of a locking mechanism. It is side surface explanatory drawing which shows the locked state of a locking mechanism. (A), (b) is explanatory drawing which shows the time of engagement and the time of non-engagement of an engagement convex part and an engagement recessed part. (A), (b) is explanatory drawing which shows the lock position and lock release position of a lock release member. It is sectional drawing of the support part seen from the apparatus front view which showed the arrangement | positioning relationship between the lock mechanism and lock | rock means which block | release the upper cover member at the time of opening of a platen cover. FIG. 47 is a rear view of the scanner showing the arrangement relationship of FIG. 46. It is the figure which looked at the support part of FIG. 46 from apparatus upper direction. It is explanatory drawing which shows the lock release state of the lock mechanism of a maximum slide position which set a book original. It is a perspective view which shows the hinge part of a platen cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Image recording part 18 Upper cover (upper cover member)
25 Sheet discharge section (sheet discharge section)
40 sheet stacking unit 50 support unit 51 first support unit 52 second support unit 100 scanner (image reading apparatus)
133,134 Rail part (sliding contact part)
133a, 134a Lower surface (sliding contact surface)
140 engaging portion 266 slide member 270 engaging convex portion 271 lock releasing member 272 engaging concave portion S sheet (sheet-like recording medium)
Xa Sheet discharge direction (paper discharge direction), slide direction Y Sheet width direction

Claims (8)

An apparatus main body provided with an image recording unit for recording an image on a sheet therein;
An upper cover member that covers an upper surface of the apparatus main body and is attached to the apparatus main body so as to be opened and closed;
An image reading device supported above the upper cover member by forming a space between the upper cover member and the upper cover member;
In the image forming apparatus, the image reading apparatus includes an openable / closable document pressing member that presses the document placed on the document placing portion.
The image reading device is mounted so as to be slidable substantially along the surface of the upper cover member, and is provided with means for prohibiting the image reading device from sliding when the document pressing member is opened. Image forming apparatus.   2. The image forming apparatus according to claim 1, wherein the slide of the image reading device is locked at a plurality of positions, and the slide movement prohibiting unit prohibits the slide movement of the image reading device at all lock positions. Image forming apparatus.   3. The image forming apparatus according to claim 1, wherein the slide movement prohibiting unit is provided on an engagement protrusion provided on the apparatus main body side and on the image reading apparatus side, and the engagement convex portion is engaged. A long member extending in the sliding direction in which the engagement recess is formed and longer than the slide width of the image reading device, and the long member is moved by the original pressing member when the original pressing member is opened. The engaging convex portion is held at a position where the engaging convex portion is engaged with the engaging concave portion, and when the document pressing member is closed, the engaging concave portion is moved to a position not engaged with the engaging convex portion. Image forming apparatus.   5. The image forming apparatus according to claim 4, wherein the elongated member has the same number of engaging recesses as the number of sliding locks. 6.   5. The image forming apparatus according to claim 4, wherein the elongate member rotates about an axis parallel to the sliding direction as a fulcrum, so that the engagement convex portion engages with the engagement concave portion and the engagement. An image forming apparatus, characterized in that the joint recess moves between positions where it is removed from the engaging projection.   6. The image forming apparatus according to claim 5, wherein an elastic force is applied to the long member so that the engaging recess is rotated in a direction to release from the engaging protrusion, and the document pressing member is opened. An image forming apparatus wherein the long member is rotated to a position where the engaging convex portion engages with the engaging concave portion against the elastic force thereof.   7. The image forming apparatus according to claim 1, wherein the document pressing member is a pressure plate that presses the document placed on the document placing portion.   7. The image forming apparatus according to claim 1, wherein the document pressing member is provided with an automatic document feeder for feeding a document to the document placement portion. .

Images