JP2019109420A - Image reading device and image formation apparatus having the same - Google Patents

Abstract

To provide an image reading device which can suppress the deflection due to the external force of a resin frame, and provide an image formation apparatus having the same.SOLUTION: An image reading device having a resin frame and a document placement table includes a document placement table unit which has the document placement table and first to third guiding members. The first end and second end facing each other in the prescribed first direction of the document placement table are fixed to first guide member and second guide member. The third end on one side in the second direction orthogonal to the first direction of the document placement table is fixed to a third guide member. The resin frame regulates the movement in the second direction of the document placement table unit with first regulation part and second regulation part on the first guide member side and second guide member side. The document placement table unit regulates the deflection in the second direction of the resin frame with a third regulation part on the third guide member side.SELECTED DRAWING: Figure 18

Description

  The present invention relates to an image reading apparatus provided with a resin frame and an image forming apparatus such as a copying machine, a multifunction machine, a facsimile apparatus, etc. provided with the same.

  A resin frame may be used as a frame provided in the image reading apparatus. In such an image reading apparatus, it is required to make the resin frame as thin as possible (for example, about 2 mm to 3 mm). Then, the rigidity of the resin frame is lowered, and there is a problem that the resin frame is bent by an external force.

  More specifically, in an image reading apparatus provided with a resin frame having an opening at the top and a document placement table detachably provided in the opening of the resin frame, for example, an operation member (for example, an operation panel) operated by the user When the resin is provided on the outer wall surface of the resin frame, an external force may be applied to the outer wall surface of the resin frame by the operation of the operation member by the user, and the outer wall surface of the resin frame may be bent. Then, for example, the gap between the exterior cover of the operation member and the main body cover of the image reading apparatus becomes large, and the appearance is not good.

  In this regard, Patent Document 1 discloses bonding the upper surface of the edge of the contact glass placed on the upper surface of the main body and the lower surface of the size instruction board in a state in which the protrusion of the size indication plate is fitted in the concave portion of the upper surface An image reading apparatus is described. That is, the image reading apparatus described in Patent Document 1 is configured to perform positioning of the size indication plate on the main body with high accuracy.

JP 2001-142157 A

  However, in the image reading device described in Patent Document 1, for example, when a resin frame is provided, when the resin frame is bent, the resin frame is bent, and the size support plate and the contact glass are simply moved. It is not designed to suppress deflection due to external force.

  Therefore, the present invention is an image forming apparatus provided with a resin frame having an opening at the upper portion and a document placement table detachably provided in the opening of the resin frame, and suppressing bending of the resin frame due to external force It is an object of the present invention to provide an image reading apparatus capable of image forming and an image forming apparatus provided with the same.

  In order to solve the above-mentioned subject, the image reading device concerning the present invention is provided with the resin frame which has an opening in the upper part, and the image reading device provided with the manuscript mounting stand removably provided in the opening of the resin frame. A document placement table unit having the document placement table and first to third guide members; first and second end portions facing each other in a predetermined first direction of the document placement table The first guide member and the second guide member are fixed to each other, and the third guide member is fixed to the third end of one side in the second direction orthogonal to the first direction of the document placement table. The resin frame restricts the movement of the document mounting table unit in the second direction by the first restricting portion and the second restricting portion on the first guide member side and the second guide member side, respectively, Mounting table uni DOO is characterized by regulating the deflection of the second direction of the resin frame by a third regulating portion in the third guide member side. An image forming apparatus according to the present invention includes the image reading apparatus according to the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress the bending by the external force of a resin frame.

FIG. 1 is a schematic cross-sectional view of an image forming apparatus including an image reading apparatus according to the present embodiment as viewed from the front. FIG. 2 is a schematic perspective view of the image forming apparatus main body shown in FIG. 1 as viewed obliquely from the upper right. FIG. 2 is a perspective view of the image reading apparatus as viewed obliquely from the upper right. FIG. 2 is an exploded perspective view of a document placement table portion of the image reading apparatus. It is a perspective view which shows the state from which the 2nd guide plate is removed from a document mounting base unit. It is a perspective view which shows the 1st process in the attachment method to the resin frame of a document mounting base unit. It is a perspective view which shows the 2nd process in the attachment method to the resin frame of a document mounting base unit. It is a perspective view for demonstrating the structure which resin frame restrict | limits the movement to the depth direction of a document mounting base unit by the 1st control part by the 1st guide plate side. It is the perspective view seen from the diagonally upper left which shows a 1st guide plate. It is a perspective view which expands and shows the ditch in the opening of a resin frame. It is the perspective view which saw the cross section which followed the AA shown in FIG. 3 from diagonally upper right. It is the perspective view which looked the 1st guide plate from the back side lower side. It is the perspective view which turned the 2nd guide plate and turned it and was seen from the front side. It is the perspective view which looked the 2nd guide plate from the back side lower side. FIG. 7 is a cross-sectional view showing the second guide plate and the document placement table when the second guide plate is not adhered to the document placement table. It is the perspective view which looked the front side part of the resin frame from diagonally upper left of the back side. It is the perspective view which looked the 3rd guide plate from the back side lower side. FIG. 6 is a perspective view of a state in which the first end of the document placement table is pressed against the left end face of the opening, as viewed from above the front side. It is a schematic sectional drawing of the 2nd double-sided adhesive sheet which adhere | attaches a document mounting base and a 2nd guide plate. It is a perspective view which shows the state which removed the upper cover member from the resin frame main body in the resin frame.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, the detailed description about them is not repeated.

[Image forming apparatus]
FIG. 1 is a schematic cross-sectional view of an image forming apparatus 100 including an image reading apparatus 200 according to the present embodiment as viewed from the front. FIG. 2 is a schematic perspective view of the image forming apparatus main body 110 shown in FIG. 1 as viewed obliquely from the upper right. In the figure, reference symbol X denotes the left and right direction (first direction) when viewed from the front, and reference symbols X1 and X2 denote the left side (one side) and the right side (the other side). The code Y represents a depth direction (second direction) orthogonal to the left and right direction X, and the codes Y1 and Y2 represent a front side (one side) and a rear side (the other side), respectively. The symbol Z represents the vertical direction and the vertical direction. Image forming apparatus 100 according to the present embodiment is a monochrome image forming apparatus. The image forming apparatus 100 performs an image forming process in accordance with the image data read by the image reading apparatus 200 or the image data transmitted from the outside. The image forming apparatus 100 may be a color image forming apparatus that forms a multi-color image and a single-color image on the sheet P.

  The image forming apparatus 100 includes a document feeder 108 and an image forming apparatus main body 110. The image forming apparatus main body 110 is provided with an image forming unit 102 and a sheet conveyance system 103.

  The image forming unit 102 includes an exposure unit 1, a developing unit 2, a photosensitive drum 3 acting as an electrostatic latent image carrier, a cleaning unit 4, a charging device 5 and a fixing unit 7. The sheet conveyance system 103 also includes a sheet feed tray 81, a manual sheet feed tray 82, an ejection roller 31, and an ejection tray 14.

  At the upper part of the image forming apparatus main body 110, an image reading apparatus 200 for reading an image of a document G is provided. The image reading apparatus 200 includes a document placement table 221 on which a document G is placed. The document placement table 221 has a rectangular shape made of transparent tempered glass. Further, a document feeding device 108 is provided above the document placement table 221. In the image forming apparatus 100, the image of the document G read by the image reading apparatus 200 is sent to the image forming apparatus main body 110 as image data, and the image is recorded on the sheet P.

  The image forming apparatus main body 110 is provided with a sheet conveyance path W1. The sheet feeding tray 81 or the manual sheet feeding tray 82 supplies the sheet P to the sheet conveyance path W1. The sheet conveyance path W1 guides the sheet P to the discharge tray 14 through the transfer roller 10 and the fixing unit 7. The fixing unit 7 heats and fixes the toner image formed on the sheet P to the sheet P. In the vicinity of the sheet conveyance path W1, pickup rollers 11a and 11b, a conveyance roller 12a, a registration roller 13, a transfer roller 10, a heat roller 71 and a pressure roller 72 in the fixing unit 7, and a discharge roller 31 are disposed.

  In the image forming apparatus 100, the sheet P supplied by the sheet feeding tray 81 or the manual sheet feeding tray 82 is conveyed to the registration roller 13. Next, the sheet P is conveyed to the transfer roller 10 at a timing at which the sheet P and the toner image on the photosensitive drum 3 are aligned by the registration roller 13. The toner image on the photosensitive drum 3 is transferred onto the sheet P by the transfer roller 10. Thereafter, the sheet P passes through the heat roller 71 and the pressure roller 72 in the fixing unit 7, and is discharged onto the discharge tray 14 through the conveyance roller 12 a and the discharge roller 31. When image formation is performed not only on the front surface of the sheet P but also on the back surface, the sheet P is transported from the discharge roller 31 to the reverse sheet transport path W2 in the reverse direction. The sheet P passes through the reverse conveying rollers 12b to 12b, and is turned over to the registration roller 13 after the sheet P is reversed. Then, the sheet P is discharged to the discharge tray 14 after a toner image is formed on the back surface and fixed, as in the front surface.

[Image reader]
FIG. 3 is a perspective view of the image reading apparatus 200 viewed obliquely from the upper right. FIG. 4 is an exploded perspective view of the document placement table 221 of the image reading apparatus 200.

  The image reading apparatus 200 includes a resin frame 210 and a document placement unit 220. The document placing unit 220 includes a document placing plate 221 having a rectangular shape when viewed from above, and first to fourth guide plates 222 to 225 (guide members). The resin frame 210 has an opening 210a at the top. The document placement table 221 is detachably provided in the opening 210 a of the resin frame 210. The resin frame 210 is a mixed resin of polycarbonate (PC) and acrylonitrile butadiene styrene copolymer synthetic resin (ABS) in this example.

  A first guide plate 222 is adhered (adhered) to a first end 221 a of the left side X <b> 1 of the document placement table 221. A second guide plate 223 is adhered (adhered) to the second end 221 b of the right side X 2 of the document placement table 221. The first guide plate 222 and the second guide plate 223 face each other in the left-right direction X. A third guide plate 224 is adhered (adhered) to the third end 221 c of the front side Y 1 in the depth direction Y of the document placement table 221. Further, the fourth guide plate 225 is adhered (adhered) to the fourth end 221 d of the back side Y 2 in the depth direction Y of the document placement table 221.

(How to attach the document table unit to the resin frame)
FIG. 5 is a perspective view showing a state in which the second guide plate 223 is removed from the document placing unit 220. As shown in FIG. FIG. 6 is a perspective view showing a first step in the method of attaching the document mounting table unit 220 to the resin frame 210. As shown in FIG. FIG. 7 is a perspective view showing a second step in the method of attaching the document mounting table unit 220 to the resin frame 210. As shown in FIG.

  As shown in FIG. 5, the first guide plate 222, the third guide plate 224, and the fourth guide plate 225 are provided on the document placement table 221 via the first, third and fourth double-sided adhesive sheets T1, T3 and T4. It is glued. Further, the second double-sided pressure-sensitive adhesive sheet T2 is attached to the lower surface of the second guide plate 223. Then, the document placement table unit 220 is attached to the resin frame 210 by the operator through the first process and the second process.

  That is, in the first step, first, the first end 221a (first guide plate 222) of the document placement table 221 to which the first guide plate 222, the third guide plate 224, and the fourth guide plate 225 are attached is an opening The end face of the left side X1 of 210a is pressed (see FIG. 6). At this time, the document placement table 221 to which the first guide plate 222, the third guide plate 224, and the fourth guide plate 225 are attached is obliquely inclined so that the right side X2 is on the upper side. Next, the right side X2 of the document placement table 221 is lowered and placed on the opening 210a.

  In the second step, the end of the back side Y2 of the second guide plate 223 is pressed against the end face of the back side Y2 of the opening 210a in the space SP of the opening 210a where the document placement table 221 is mounted (FIG. 7). reference). At this time, the second guide plate 223 is inclined obliquely so that the front side Y1 is on the upper side. Next, the front side Y1 of the second guide plate 223 is lowered, and the second guide plate 223 is attached to the document placement table 221 at the opening 210a. At this time, the gap SP is closed by the second guide plate 223. Then, the first fixing portion 241 on the second guide plate 223 side is fixed to the second fixing portion 242 on the resin frame 210 side by a fixing member SC (see FIG. 3) such as a screw. Thus, the document placing unit 220 is attached to the resin frame 210.

First Embodiment
By the way, in the image reading apparatus 200, the resin frame 210 is made as thin as possible (for example, about 2 mm to 3 mm). Then, the rigidity of the resin frame 210 is lowered, and there is a problem that the resin frame 210 is bent by an external force.

  Specifically, in the image reading apparatus 200, an operation panel 104 (see FIGS. 2 and 3) operated by the user is provided on the outer wall surface 210b (attaching portion 210b1) of the resin frame 210. In this case, an external force is applied to the outer wall surface of the resin frame 210 by an operation of the operation panel 104 by the user, and the outer wall surface of the resin frame 210 may be bent.

  In this respect, in the present embodiment, the resin frame 210 is in the depth direction Y of the document placing unit 220 by the first restricting portion 230 and the second restricting portion 240 on the first guide plate 222 side and the second guide plate 223 side, respectively. It regulates the movement to (especially front side Y1). The document placement unit 220 regulates the deflection of the resin frame 210 in the depth direction Y (in particular, the front side Y1) by the third regulating unit 250 on the third guide plate 224 side.

  According to the present embodiment, the resin frame 210 is moved in the depth direction Y of the document placement table 221 by the first restricting portion 230 and the second restricting portion 240 on the first guide plate 222 side and the second guide plate 223 side, respectively. Regulate. Further, the document placement table unit 220 regulates the bending of the resin frame 210 in the depth direction Y by the third regulation unit 250 on the third guide plate 224 side. Therefore, even if bending of the resin frame 210 in the depth direction Y occurs, the third guide plate 224 and the document placement table 221 are subjected to bending of the resin frame 210 by the first restricting portion 230 and the second restricting portion 240. It is possible to avoid moving in the depth direction Y. Thereby, the bending by the external force of the resin frame 210 can be suppressed. For example, it can be avoided that a gap between an exterior cover (not shown) provided on the operation panel 104 and a main body cover (not shown) provided on the image reading apparatus 200 becomes large. Therefore, it can look good.

(First guide plate)
FIG. 8 is a perspective view for describing a configuration in which the resin frame 210 restricts the movement of the document placing unit 220 in the depth direction Y by the first restricting portion 230 on the first guide plate 222 side. FIG. 9 is a perspective view of the first guide plate 222 as viewed from the upper left.

  As shown in FIGS. 8 and 9, in the present embodiment, the first restricting portion 230 includes a first engaging portion 231 and a first locking portion 232. The first engagement portion 231 is provided on the first guide plate 222. The first locking portion 232 locks the first engagement portion 231. The first locking portion 232 is provided at the edge of the opening 210 a in the resin frame 210. In this way, the movement of the first end 221a of the document placement table 221 in the depth direction Y can be reliably restricted on the first guide plate 222 side with a simple configuration.

  Specifically, the first guide plate 222 doubles as a size indication plate for indicating the size of the document G in the depth direction Y. The fourth guide plate 225 doubles as a size indication plate for indicating the size of the document G in the left-right direction X. The first engaging portion 231 is a convex portion 231 a which protrudes from the end surface of the left side X 1 of the first guide plate 222 to the left side X 1 and extends in the depth direction Y. The first locking portion 232 is a wall 232 a standing on the upper side from the resin frame 210. The first engagement portion 231 is disposed in contact with or closely spaced from the first locking portion 232. As a result, the movement of the first engagement portion 231 in the depth direction Y is restricted by the first locking portion 232. In addition, in FIG. 8, the structure of only front side Y1 of the 1st engaging part 231 and the 1st latching | locking part 232 is shown. However, the configuration of the back side Y2 of the first engagement portion 231 and the first locking portion 232 is also the same as the configuration of the front side Y1.

  FIG. 10 is an enlarged perspective view of the concave groove 213 in the opening 210 a of the resin frame 210. FIG. 11 is a perspective view of a cross section taken along the line AA shown in FIG.

  As shown in FIGS. 10 and 11, the edge of the left side X1 of the opening 210a of the resin frame 210 is a document guide portion 214 (a document guide plate) for scooping the read document G. A recessed groove 213 extending over the entire area in the depth direction Y is formed on the end face of the document guide portion 214 on the right side X2. Further, a plurality of projecting portions 231 b (see FIG. 9) are provided at an intermediate portion in the depth direction Y of the first engaging portion 231. The protrusion 231 b extends obliquely downward from the first engagement portion 231. The protrusion 231 b is inserted into the recessed groove 213. As a result, the first end 221a (first guide plate 222) of the document placement table 221 can be reliably pressed against the end surface of the left side X1 (document guide portion 214) of the opening 210a.

  FIG. 12 is a perspective view of the first guide plate 222 as viewed from below the back side Y2. As shown in FIG. 12, the first guide plate 222 is provided with a positioning portion 222 a. The positioning unit 222 a positions the first guide plate 222 in the depth direction Y with respect to the document placement table 221. The positioning portion 222 a is extended downward from the end of the front side Y 1 of the first guide plate 222. The positioning portion 222 a is provided with a plurality of rib pieces 222 b that abut on the document placement table 221. Thus, the first guide plate 222 can be accurately positioned relative to the document placement table 221 in the depth direction Y. The first double-sided pressure-sensitive adhesive sheet T1 is attached to the end of the right side X2 of the lower surface of the first guide plate 222 along the depth direction Y. A white shading sheet 222c is provided on the lower surface of the first guide plate 222.

  FIG. 13 is a perspective view of the second guide plate 223 turned upside down and viewed from the front side Y1. FIG. 14 is a perspective view of the second guide plate 223 as viewed from below the back side Y2. In the present embodiment, the second restricting portion 240 includes a first fixing portion 241 and a second fixing portion 242 (see FIG. 7). The first fixing portion 241 is provided on the second guide plate 223. The second fixing portion 242 is a sheet metal in this example. The second fixing portion 242 is fixed to the resin frame 210. The second fixing portion 242 fixes the first fixing portion 241 to the resin frame 210 by a fixing member SC (see FIG. 3) such as a screw. In this way, the movement of the second end 221b of the document placement table 221 in the depth direction Y can be reliably restricted on the second guide plate 223 side with a simple configuration.

  Specifically, the first fixing portion 241 is provided at the end of the front side Y1 of the second guide plate 223. The first fixed portion 241 is provided with a cylindrical portion projecting downward of the second guide plate 223. The first fixing portion 241 is provided with a through hole 241 a for inserting the fixing member SC. A through hole 210c (see FIG. 6) penetrating in the depth direction Y is formed on the end face of the back side Y2 of the opening 210a of the resin frame 210. In addition, a protrusion 223 a is provided at the end of the back side Y 2 of the second guide plate 223. The protruding portion 223a is extended from the second guide plate 223 to the back side Y2. The protrusion 223a is inserted into the through hole 210c. Thus, the end of the back side Y2 of the second guide plate 223 can be reliably pressed against the end face of the back side Y2 of the opening 210a. Further, the second guide plate 223 is provided with a positioning portion 223 b. The positioning unit 223 b positions the second guide plate 223 in the depth direction Y with respect to the document placement table 221. The positioning portion 223 b extends downward from the end of the front side Y 1 of the second guide plate 223. The positioning portion 223b is provided with a rib piece 223c that abuts on the document placement table 221. Thus, the second guide plate 223 can be accurately positioned relative to the document placement table 221 in the depth direction Y.

  FIG. 15 is a cross-sectional view showing the second guide plate 223 and the document placement table 221 when the second guide plate 223 is not bonded to the document placement table 221. As shown in FIG.

  By the way, as shown in FIG. 15, when the second guide plate 223 is not adhered to the document placement table 221, a slight gap d between the lower surface 223d of the second guide plate 223 and the upper surface 221e of the document placement table 221. It may be empty. Then, the document G on the document placement table 221 may enter the gap d. In this case, when the document G is pulled out from the gap d, the document G may be damaged.

  In this respect, in the present embodiment, the second guide plate 223 is bonded to the second end 221 b of the document placement table 221 via the second double-sided pressure-sensitive adhesive sheet T2. By doing this, the gap between the second guide plate 223 and the document placement table 221 can be eliminated. Thus, the document G on the document placement table 221 can be prevented from entering the gap between the second guide plate 223 and the document placement table 221. Specifically, the second double-sided pressure-sensitive adhesive sheet T2 is attached to the end portion of the left side X1 along the depth direction Y on the lower surface 223d of the second guide plate 223.

  FIG. 16 is a perspective view of the front side Y1 of the resin frame 210 as viewed from the upper left of the rear side Y2. FIG. 17 is a perspective view of the third guide plate 224 as viewed from below the back side Y2. FIG. 18 is a perspective view of a state in which the first end 221a of the document placement table 221 is pressed against the end face of the left side X1 of the opening 210a as viewed from above the front side Y1.

  As shown in FIGS. 16 to 18, in the present embodiment, the third restricting portion 250 includes a second engaging portion 251 and a second locking portion 252. The second engagement portion 251 is provided on the resin frame 210. The second locking portion 252 locks the second engagement portion 251. The second locking portion 252 is provided on the third guide plate 224. In this way, the bending in the depth direction Y of the resin frame 210 can be reliably restricted on the third guide plate 224 side even with a simple configuration.

  Specifically, as shown in FIGS. 16 and 18, the second engagement portion 251 is a plurality of concave portions 251 a extending in the left-right direction X. The plurality of concave portions 251 a are provided on the upper surface of the resin frame 210 so as to be aligned in the left-right direction X. The recess 251 a at the central portion in the left-right direction X is longer than the recesses 251 a on both sides. It is preferable that the plurality of concave portions 251 a be provided at a position close to the first fixing portion G 1 of the resin frame 210. By doing this, it is possible to further suppress the bending of the resin frame 210 due to an external force.

  Further, the second engagement portion 251 is a positioning portion (groove portion) that positions the third guide plate 224 in the depth direction Y with respect to the document placement table 221. One or more rib pieces 251 b (see FIG. 16) that abut on the second locking portion 252 are provided outside the inner wall of the second engaging portion 251. Thus, the resin frame 210 can be accurately positioned in the depth direction Y with respect to the document placement table 221. The rib piece 251 b may be provided inside of the inner wall instead of or in addition to the outside of the inner wall of the second engaging portion 251.

  As shown in FIGS. 17 and 18, the second locking portion 252 is a plurality of convex portions 252 a extending in the left-right direction X. A positioning portion 224 a is provided on the third guide plate 224. The positioning unit 224 a positions the third guide plate 224 in the depth direction Y with respect to the document placement table 221. The positioning portion 224 a is extended downward from the end of the front side Y 1 of the third guide plate 224. The convex portion 252a is extended downward from the lower surface of the positioning portion 224a.

  Further, the convex portion 252a becomes smaller as the distance in the left-right direction X becomes closer to the tip. That is, the inclined surface 252b which becomes low as it positions outside the left-right direction X is provided in the both ends of the left-right direction X of the convex part 252a. The positioning portion 224a is provided with a plurality of rib pieces 224b (see FIG. 17) that abut the document placement table 221. Thus, the third guide plate 224 can be accurately positioned relative to the document placement table 221 in the depth direction Y. The third double-sided pressure-sensitive adhesive sheet T3 is attached to the end of the back surface side Y2 of the lower surface of the third guide plate 224 along the left-right direction X.

Second Embodiment
FIG. 19 is a schematic cross-sectional view of a second double-sided pressure-sensitive adhesive sheet T2 for bonding the document placement table 221 and the second guide plate 223. In the second double-sided pressure-sensitive adhesive sheet T <b> 2, the first adhesive force F <b> 1 to the document placement table 221 is smaller than the second adhesive force F <b> 2 to the second guide plate 223. By doing this, it is possible to easily attach and remove the second guide plate 223 to the document placement table 221 in a large number of maintenance operations with the second double-sided adhesive sheet T2 attached to the second guide plate 223. . Here, as the second double-sided pressure-sensitive adhesive sheet T2, a sheet is used in which the first adhesive force F1 is maintained at a predetermined adhesive force even after being attached to and removed from the document placement table 221 many times.

  Specifically, the second double-sided pressure-sensitive adhesive sheet T2 is composed of a lower double-sided pressure-sensitive adhesive sheet T21 and an upper double-sided pressure-sensitive adhesive sheet T22. The lower double-sided pressure-sensitive adhesive sheet T21 is composed of a sheet body T21a and pressure-sensitive adhesives T21b and T21c on both sides. The upper double-sided pressure-sensitive adhesive sheet T22 is composed of a sheet body T22a and pressure-sensitive adhesives T22b and T22c on both sides. In the lower double-sided pressure-sensitive adhesive sheet T21, the adhesive strength of the pressure-sensitive adhesives T21b and T21c on both sides is taken as a first adhesive strength F1. The upper double-sided pressure-sensitive adhesive sheet T22 has a second adhesive strength F2 in which the adhesive strength of the adhesive T22b, T22c on both sides is larger than the first adhesive strength F1. The upper adhesive T21b of the lower double-sided adhesive sheet T21 and the lower adhesive T22b of the upper double-sided adhesive sheet T22 are adhered to each other. By doing this, the second double-sided pressure-sensitive adhesive sheet T2 can be configured using the commercially available lower double-sided pressure-sensitive adhesive sheet T21 and the upper double-sided pressure-sensitive adhesive sheet T22. Here, the upper double-sided pressure-sensitive adhesive sheet T22 is the same as the first double-sided pressure-sensitive adhesive sheet T1, the third double-sided pressure-sensitive adhesive sheet T3, and the fourth double-sided pressure-sensitive adhesive sheet T4.

  As the second double-sided pressure-sensitive adhesive sheet T2, a single-sided double-sided pressure-sensitive adhesive sheet in which the pressure-sensitive adhesive on one side of the sheet body has a first adhesive force F1 and the pressure-sensitive adhesive on the other side of the sheet body has a second adhesive force F2 You may use.

Third Embodiment
(Resin frame)
FIG. 20 is a perspective view showing the resin frame 210 with the upper cover member 212 removed from the resin frame main body 211. As shown in FIG.

  As shown in FIG. 20, in the present embodiment, the resin frame 210 is provided with a resin frame main body 211 and an upper cover member 212. The upper cover member 212 is provided on the resin frame main body 211. The upper cover member 212 has an opening 210a. The document placement table 221 is detachably provided in the opening 210 a of the upper cover member 212.

  The upper cover member 212 is positioned with respect to the resin frame main body 211 by three positioning portions Q1, Q2, and Q3. Positioning convex part Q11 and positioning concave part Q12 which constitute positioning part Q1 are provided in the end of left side X1 of resin frame 210 and the end of back side Y2. Positioning convex part Q21 and positioning concave part Q22 which comprise positioning part Q2 are provided in the end of right side X2 of resin frame 210, and the end of back side Y2. Positioning convex part Q31 and positioning concave part Q32 which constitute positioning part Q3 are provided on the end of front side Y1 closer to the left side X1 than the central part of resin frame 210 in the left-right direction X. The positioning recess Q22 is an elongated hole along the lateral direction X. The positioning recess Q32 is an elongated hole along the depth direction Y. Further, the upper cover member 212 is fixed to the resin frame main body 211 by a plurality of fixing portions. The first fixing portions G1 to G1 on the upper cover member 212 side are fixed to the second fixing portions G2 to G2 on the resin frame main body 211 side by fixing members (not shown) such as screws. Thus, the upper cover member 212 is fixed in a state of being positioned with respect to the resin frame main body 211.

  In such a configuration, the upper cover member 212 moves the document mounting table unit 220 in the depth direction Y by the first restricting portion 230 and the second restricting portion 240 on the first guide plate 222 side and the second guide plate 223 side, respectively. regulate. The document placement table unit 220 regulates the bending of the resin frame main body 211 in the depth direction Y via the upper cover member 212 by the third regulating unit 250 on the third guide plate 224 side. Thereby, even if the resin frame 210 includes the resin frame main body 211 and the upper cover member 212, it is possible to suppress the bending of the resin frame main body 211 due to an external force.

(Other embodiments)
In the present embodiment, one side in the predetermined first direction is the left side X1 and the other side is the right side X2, but one side in the first direction may be the right side X2 and the other side may be the left side X1. Although one side in the predetermined second direction is the front side Y1 and the other side is the back side Y2, one side in the second direction may be the back side Y2 and the other side may be the front side Y1. Alternatively, the first direction may be the depth direction Y, and the second direction may be the left-right direction X.

  The present invention is not limited to the embodiments described above, and can be implemented in other various forms. Therefore, such an embodiment is merely illustrative in every point and should not be interpreted in a limited manner. The scope of the present invention is indicated by the scope of the claims, and is not limited at all by the text of the specification. Furthermore, all variations and modifications that fall within the equivalent scope of the claims fall within the scope of the present invention.

100 image forming apparatus 200 image reading apparatus 210 resin frame 210a opening 211 resin frame main body 212 upper cover member 220 document placing table unit 221 document placing table 222 first guide plate (first guide member)
223 Second guide plate (second guide member)
224 Third guide plate (second guide member)
230 1st regulation part 240 2nd regulation part 250 3rd regulation part F1 1st adhesive force F2 2nd adhesive force G manuscript T2 2nd double-sided adhesive sheet (double-sided adhesive sheet)
X left and right direction (first direction)
Y depth direction (second direction)
Y1 front side (one side in the second direction)

Claims (7)

An image reading apparatus comprising: a resin frame having an opening at an upper portion; and a document placement table detachably provided in the opening of the resin frame,
A document table unit having the document table and first to third guide members;
A first guide member and a second guide member are fixed to the first end and the second end opposite to each other in the predetermined first direction of the document placement table,
A third guide member is fixed to a third end of one side in a second direction orthogonal to the first direction of the document placement table,
The resin frame restricts the movement of the document placement unit in the second direction by the first restricting portion and the second restricting portion on the first guide member side and the second guide member side, respectively.
The image reading apparatus, wherein the document placement table unit regulates the bending of the resin frame in the second direction by a third regulating unit on the third guide member side. The image reading apparatus according to claim 1,
The first restricting portion is provided at a first engaging portion provided to the first guide member, and at an edge portion of the opening in the resin frame to engage the first engaging portion. An image reading apparatus comprising: a stop portion. An image reading apparatus according to claim 1 or 2, wherein
The second restricting portion includes a first fixing portion provided to the second guide member, and a second fixing portion provided to the resin frame to fix the first fixing portion to the resin frame. An image reading apparatus characterized in that. The image reading apparatus according to any one of claims 1 to 3, wherein
The third restricting portion includes a second engaging portion provided on the resin frame, and a second locking portion provided on the third guide member for locking the second engaging portion. An image reading apparatus characterized in that. The image reading apparatus according to any one of claims 1 to 4, wherein
The second guide member is bonded to the second end of the document placement table via a double-sided adhesive sheet.
The image reading apparatus according to claim 1, wherein the adhesive force to the document placement table is smaller than the adhesive force to the second guide member. The image reading apparatus according to any one of claims 1 to 5, wherein
The resin frame includes a resin frame main body and an upper cover member provided on the resin frame main body and having the opening, and the document placement table is detachably provided in the opening of the upper cover member. And
The upper cover member restricts the movement of the document placement table unit in the second direction by the first restricting portion and the second restricting portion on the first guide member side and the second guide member side, respectively. The image reading apparatus, wherein the document placement table unit regulates the bending of the resin frame main body in the second direction via the upper cover member by the third restricting portion on the third guide member side. .   An image forming apparatus comprising the image reading apparatus according to any one of claims 1 to 6.

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