Substrate mounting structure and image forming apparatus

Abstract

To easily mount a substrate on a mounting surface extending in a vertical direction while preventing a wire from being caught between the substrate and a mounting portion.SOLUTION: A substrate 5 has a first side 5a and a second side 5b forming both edges in a first direction, and a third side 5c and a fourth side 5d forming both edges in a second direction. The substrate 5 has a hook hole 51 and a plurality of screw insertion holes 52. The hook hole 51 is formed at a portion near the third side 5c along the edge portion of the first side 5a of the substrate 5. A mounting portion 6 includes a hook 61, a plurality of fastening holes 62, and a rotation restricting portion 63. The hook 61 is inserted through the hook hole 51. The rotation restricting portion 63 restricts rotation of the substrate 5. The dimension of the hook hole 51 in the first direction is larger than the dimension of the hook 61 in a vertical direction, and a plurality of wire harnesses 8 are routed from the mounting portion 6 side through the outside of the third side 5c and the fourth side 5d of the substrate 5.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a board mounting structure for mounting a board on a mounting surface along the vertical direction, and to an image forming apparatus. [Background technology]

[0002] When a board is fixed to a mounting surface along the vertical direction with a plurality of screws, it is necessary to hold the board so that it does not fall, i.e., the plurality of screws are fastened into a plurality of fastening holes formed on the mounting surface while the board is held in a mounting position along the mounting surface.

[0003] It is also known that a hook is provided on the mounting surface, and the plurality of screws are fastened into the plurality of fastening holes in a state where the substrate is hooked on the hook (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-30576 Summary of the Invention [Problem to be solved by the invention]

[0005] In some cases, electric wires are routed from the mounting portion to the front side via the side of the circuit board. In this case, it is necessary to prevent the electric wires from being pinched between the circuit board and the mounting portion when the circuit board is mounted.

[0006] An object of the present invention is to provide a board mounting structure and an image forming apparatus that can easily mount a board on a mounting surface along the vertical direction while preventing electric wires from being pinched between the board and the mounting portion. [Means for solving the problem]

[0007] A circuit board mounting structure according to one aspect of the present invention includes a circuit board, a mounting portion, and a plurality of screws. The circuit board has a first side and a second side that form both edges in a first direction, and a third side and a fourth side that form both edges in a second direction intersecting the first direction. The mounting portion has a mounting surface formed along the vertical direction, and the circuit board is attached with the first side of the circuit board facing upward and the first surface of the circuit board facing the mounting surface. The plurality of screws secure the circuit board to the mounting portion. The circuit board has a hook hole and a plurality of screw insertion holes. The hook hole is formed in a portion of an edge along the first side near the third side, and is a hole through which a portion of the mounting portion is inserted. The plurality of screw insertion holes are holes through which the plurality of screws are inserted. The mounting portion has a hook, a plurality of fastening holes, and a rotation restricting portion. The hook protrudes from the mounting surface and is inserted into the hanging hole to support a supported portion, which is an edge portion of the first side of the hanging hole on the board. The multiple fastening holes are holes into which the multiple screws inserted into the multiple screw insertion holes of the board are fastened, respectively. The rotation restricting portion restricts rotation of the board around the hook inserted into the hanging hole by contacting the outer edge of the board while the hook supports the supported portion of the board. The hook has a protruding base and a separation restricting portion. The protruding base protrudes from the mounting surface and supports the supported portion of the board. The separation restricting portion protrudes upward from a tip end of the protruding base and restricts movement of the supported portion supported by the protruding base in a direction away from the mounting surface. The dimension of the hanging hole in the first direction of the board is larger than the dimension of the hook in the up-down direction, and a plurality of wire harnesses are wired from the mounting portion side to the second surface of the board via the outside of the third side and the fourth side of the board. When the board is brought close to the mounting surface with the first direction of the board aligned with the up-down direction, the hook is inserted into the hanging hole and the supported portion is placed on the protruding base.

[0008] According to another aspect of the present invention, an image forming apparatus includes a sheet transporting device, a printing device, and the board mounting structure. The sheet transporting device transports a sheet. The printing device forms an image on the transported sheet. The board mounting structure is a structure for mounting a board that controls the sheet transporting device or the printing device. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a board mounting structure and an image forming apparatus that can easily mount the board on a mounting surface that aligns in the vertical direction while preventing the electric wires from being pinched between the board and the mounting portion. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a configuration diagram of an image forming apparatus including a board mounting structure according to an embodiment. [Figure 2] FIG. 2 is a front view of the board mounting structure according to the embodiment. [Figure 3] FIG. 3 is a perspective view of the hook and first fastening hole in the board mounting structure according to the embodiment. [Figure 4] FIG. 4 is a front view of a part of the board and the hooks in the board mounting structure according to the embodiment. [Figure 5] FIG. 5 is a side view of the upper edge of the board and the hook in the board mounting structure according to the embodiment (in a state immediately before the hook is hung on the hanging hole of the board). [Figure 6] FIG. 6 is a side view of the upper edge of the board and the hook in the board mounting structure according to the embodiment (in the state where the hook is being hung on the hook). [Figure 7] FIG. 7 is a side view of the upper edge of the board and the hook in the board mounting structure according to the embodiment (with the hook hooked onto the board's hook hole). [Figure 8] FIG. 8 is a perspective view of the lower edge of the substrate and the rotation restricting portion in the substrate mounting structure according to the embodiment (in a state where the lower edge of the substrate is separated from the rotation restricting portion). [Figure 9] FIG. 9 is a perspective view of the lower edge of the substrate and the rotation restricting portion in the substrate mounting structure according to the embodiment (in a state where the lower edge of the substrate is in contact with the rotation restricting portion). [Figure 10] FIG. 10 is a plan view of the mounting portion and the substrate in the substrate mounting structure according to the embodiment (in a state where the first side of the substrate is brought close to the mounting surface). [Figure 11] FIG. 11 is a plan view of the mounting portion and the board in the board mounting structure according to the embodiment (with the top edge of the board hooked on the hook). DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the following embodiment is an example of the present invention, and does not limit the technical scope of the present invention.

[0012] The board mounting structure 50 according to the embodiment constitutes a part of the image forming apparatus 10.

[0013] [Configuration of image forming apparatus 10] As shown in FIG. 1, an image forming apparatus 10 includes a main housing 1, and a sheet conveying device 3 and a printing device 4 disposed within the main housing 1.

[0014] The sheet transport device 3 transports the sheets 9. The sheet transport device 3 includes a sheet feeding mechanism 30 and multiple pairs of transport rollers 31. The sheet feeding mechanism 30 sends out the sheets 9 in the sheet storage unit 2 one by one to a sheet transport path 300. The multiple pairs of transport rollers 31 rotate to transport the sheets 9 along the sheet transport path 300.

[0015] One of the plurality of pairs of conveying rollers 31 discharges the sheet 9 on which the image has been formed from the sheet conveying path 300 to the discharge tray 1a.

[0016] The printing device 4 forms an image on the sheet 9 conveyed by the sheet conveying device 3. In the example shown in Fig. 1, the printing device 4 forms an image on the sheet 9 by electrophotography.

[0017] The electrophotographic printing apparatus 4 includes a laser scanning device 40, one or more image forming units 4x, a transfer device 45, and a fixing device 46. The image forming units 4x include a photoconductor 41, a charging device 42, a developing device 43, a first cleaning device 44, and the like.

[0018] The charging device 42 charges the surface of the rotating photoconductor 41. The laser scanning device 40 forms an electrostatic latent image on the surface of the photoconductor 41 by scanning the charged surface of the photoconductor 41 with a laser beam.

[0019] The developing device 43 develops the electrostatic latent image formed on the surface of the photoreceptor 41 into a toner image. The transfer device 45 transfers the toner image from the surface of the photoreceptor 41 to a sheet 9. The fixing device 46 fixes the toner image to the sheet 9 by applying pressure and heat to the toner image on the sheet 9.

[0020] 1, the printing device 4 is a tandem color printing device. In this case, the printing device 4 has multiple image forming units 4x corresponding to multiple developing colors. The transfer device 45 also includes an intermediate transfer belt 450, and multiple primary transfer devices 451 and secondary transfer devices 452 corresponding to the multiple image forming units 4x.

[0021] The plurality of primary transfer devices 451 transfer the toner images from the photoconductors 41 in the plurality of image forming units 4x onto the surface of the rotating intermediate transfer belt 450. The secondary transfer device 452 transfers the toner images on the surface of the intermediate transfer belt 450 onto the sheet 9.

[0022] The printing device 4 may be a device that forms an image on the sheet 9 by a method other than the electrophotographic method, such as an inkjet method.

[0023] In the image forming apparatus 10, the board mounting structure 50 is a structure for mounting the board 5 that controls the sheet transport device 3 or the printing device 4 in the mounting portion 6. The board 5 is a printed board such as a control board or a signal processing board.

[0024] For example, a motor that rotates the plurality of conveying roller pairs 31 or a motor drive circuit that drives a motor that rotates the photosensitive member 41 is mounted on the substrate 5. Alternatively, a signal processing circuit that processes a detection signal from a sensor such as a sheet sensor that detects the sheet 9 in the sheet conveying path 300 is mounted on the substrate 5.

[0025] In this embodiment, the board mounting structure 50 is disposed inside the rear cover of the main housing 1.

[0026] 2, in the board mounting structure 50, the mounting portion 6 has a mounting surface 60 along the vertical direction D1. In FIGS. 2 to 11, the vertical direction D1 is the up-down direction.

[0027] In the board mounting structure 50, the board 5 is fixed to the mounting portion 6 by a plurality of screws 7 with the first surface 5x of the board 5 aligned along the mounting surface 60. The board 5 is mounted to the mounting portion 6 with the first surface 5x and the second surface 5y of the board 5 aligned along the vertical direction D1. The first surface 5x and the second surface 5y are the front and back surfaces of the board 5.

[0028] 2 to 11, the width direction D2 is a horizontal direction along the mounting surface 60. The depth direction D3 is a direction perpendicular to the mounting surface 60.

[0029] When the substrate 5 is fixed to the mounting surface 60 along the vertical direction D1 by the plurality of screws 7, it is necessary to hold the substrate 5 so that it does not fall. That is, with the substrate 5 held in the mounting position along the mounting surface 60, the plurality of screws 7 are fastened into the plurality of fastening holes 62 formed in the mounting surface 60.

[0030] Incidentally, there are cases where multiple electric wires 80 are wired from the mounting portion 6 side to the front side via the side of the board 5. In this case, it is necessary to prevent the multiple electric wires 80 from being pinched between the board 5 and the mounting portion 6 when the board 5 is mounted.

[0031] In the board mounting structure 50, it is desirable to be able to easily mount the board 5 on the mounting surface 60 along the longitudinal direction D1 while preventing the plurality of electric wires 80 from being pinched between the board 5 and the mounting surface 60.

[0032] [Board mounting structure 50] The board mounting structure 50 includes a board 5, a mounting portion 6, and a plurality of screws 7. The board 5 has a first side 5a and a second side 5b that form both edges of the board 5 in a first direction D10, and a third side 5c and a fourth side 5d that form both edges of the board 5 in a second direction D20 (see FIG. 2).

[0033] In this embodiment, the first direction D10 is the longitudinal direction of the substrate 5, and the second direction D20 is the lateral direction of the substrate 5 (see FIG. 2). The second direction D20 is a direction intersecting the first direction D10. More specifically, the second direction D20 is a direction perpendicular to the first direction D10.

[0034] The substrate 5 is attached to the mounting portion 6 with the first side 5a facing upward and the first surface 5x facing the mounting surface 60. The substrate 5 has a hanging hole 51 and a plurality of screw insertion holes 52 (see FIG. 1). The mounting portion 6 has a hook 61, a plurality of fastening holes 62, and a rotation restricting portion 63 (see FIG. 1).

[0035] The hanging hole 51 is a hole formed in a portion of the edge along the first side 5a of the substrate 5, closer to the third side 5c. The hook 61 of the mounting part 6 is inserted into the hanging hole 51. The plurality of screw insertion holes 52 are holes into which the plurality of screws 7 are inserted.

[0036] The hook 61 protrudes from the mounting surface 60. The hook 61 is inserted into the hanging hole 51 to support the supported portion 51a of the substrate 5 (see FIG. 7). The supported portion 51a is the edge of the hanging hole 51 on the first side 5a side of the substrate 5.

[0037] The plurality of fastening holes 62 are holes into which the plurality of screws 7 inserted into the plurality of screw insertion holes 52 of the substrate 5 are fastened. The fastening holes 62 are holes on which a screw thread is formed.

[0038] The rotation restricting portion 63 restricts the rotation of the substrate 5 around the hook 61 inserted through the hanging hole 51 by contacting the outer edge of the substrate 5 while the hook 61 supports the supported portion 51a of the substrate 5.

[0039] For example, the rotation restricting portion 63 contacts a portion of the second side 5b of the substrate 5 closer to the third side 5c (see FIG. 2). Alternatively, the rotation restricting portion 63 may contact a portion of the second side 5b of the substrate 5 closer to the fourth side 5d.

[0040] The hook 61 has a protruding base 611 and a separation restriction portion 612 (see FIGS. 3 and 5). The protruding base 611 protrudes from the mounting surface 60 and supports the supported portion 51a of the substrate 5 (see FIG. 7).

[0041] The separation restriction portion 612 protrudes upward from the tip of the protruding base portion 611 (see FIGS. 3, 5 to 7). The separation restriction portion 612 restricts the movement of the supported portion 51a supported by the protruding base portion 611 in a direction away from the mounting surface 60 (see FIG. 7). In other words, the separation restriction portion 612 is a retaining portion that restricts the hook 61 from coming off the hanging hole 51.

[0042] The upper edge of the portion of the protruding base 611 between the mounting surface 60 and the separation restriction portion 612 is a support portion 611a that supports the supported portion 51a of the board 5 (see FIG. 7). The support portion 611a is formed along the depth direction D3.

[0043] The substrate 5 is supported by the hooks 61 at the supported portions 51a and is restricted by the separation restricting portions 612, so that the substrate 5 is positioned at the mounting position.

[0044] The vertical dimension 5H of the hanging hole 51 of the base plate 5 is larger than the vertical dimension 6H of the hook 61 (see FIGS. 4 and 5). The vertical dimension 5H is the dimension of the hanging hole 51 of the base plate 5 in the first direction D10. The vertical dimension 6H is the dimension of the hook 61 in the vertical direction D1.

[0045] Similarly, the horizontal dimension 5W of the hanging hole 51 of the base plate 5 is larger than the horizontal dimension 6W of the hook 61 (see FIG. 4). The horizontal dimension 5W is the dimension of the hanging hole 51 of the base plate 5 in the second direction D20. The horizontal dimension 6W is the dimension of the hook 61 in the width direction D2.

[0046] A plurality of wire harnesses 8 are wired in the board mounting structure 50. Each of the wire harnesses 8 includes a plurality of electric wires 80 and a connector 81 connected to one end of the plurality of electric wires 80 (see FIG. 2).

[0047] The plurality of wire harnesses 8 are routed from the mounting portion 6 side to the second surface 5y of the board 5 via the outside of the third side 5c and the fourth side 5d of the board 5 (see FIG. 2).

[0048] A plurality of connectors 54 are mounted on the second surface 5y of the substrate 5 (see FIG. 2). The connectors 81 of the plurality of wire harnesses 8 are connected to the plurality of connectors 54 (see FIG. 2).

[0049] In this embodiment, the substrate 5 has a fitting hole 53 formed in a portion of the edge along the second side 5b near the third side 5c (see FIGS. 2, 8, and 9). Meanwhile, the mounting portion 6 has a fitting protrusion 64 protruding from the mounting surface 60 (see FIGS. 2, 8, and 9). The fitting protrusion 64 fits into the fitting hole 53.

[0050] The substrate 5 is supported by the hook 61 at the supported portion 51a, and the fitting protrusion 64 and the fitting hole 53 are fitted together, so that the substrate 5 is positioned at the mounting position with high accuracy.

[0051] In this embodiment, the mounting portion 6 is a sheet metal member. The fitting protrusion 64 is a protrusion formed by half-punching. This prevents burrs from being formed on the fitting protrusion 64, and prevents the board 5 from being damaged by contact with the fitting protrusion 64.

[0052] The hook 61 is a portion formed by bending a part of a metal plate along the depth direction D3. The distance restricting portion 612 of the hook 61 has a curved contour. This prevents the board 5 from being damaged by contact with the distance restricting portion 612.

[0053] In this embodiment, the mounting surface 60 is composed of a plurality of unit mounting surfaces formed at intervals in the longitudinal direction D1 and the width direction D2. The mounting surface 60 includes a first mounting surface 60a formed near a first end of the mounting section 6 in the width direction D2, and a second mounting surface 60b formed near a second end of the mounting section 6 in the width direction D2 (see FIG. 2).

[0054] 2, the left end is the first end in the width direction D2, and the right end is the second end in the width direction D2. The hook 61 protrudes from the first attachment surface 60a along the depth direction D3.

[0055] When the substrate 5 is brought close to the mounting surface 60 with the first direction D10 of the substrate 5 aligned with the vertical direction D1, the hook 61 is inserted into the hanging hole 51 and the supported portion 51a is placed on the protruding base 611.

[0056] In the following description, of the multiple wire harnesses 8, the portion wired at the first end side of the mounting portion 6 will be referred to as the first wire harness 8a, and the portion wired at the second end side of the mounting portion 6 will be referred to as the second wire harness 8b (see Figures 2, 10, and 11).

[0057] When the substrate 5 is attached to the attachment portion 6, the substrate 5 is brought close to the attachment portion 6 along the depth direction D3 with the first side 5a of the substrate 5 facing upward and the first direction D10 of the substrate 5 aligned with the vertical direction D1 (see Figure 10).

[0058] The board 5 is brought closer to the mounting portion 6 in a state inclined with respect to the depth direction D3 so that the third side 5c is closer to the mounting portion 6 than the fourth side 5d (see FIG. 10). At this time, the third side 5c of the board 5 is brought closer to the first mounting surface 60a while avoiding the first wire harness 8a.

[0059] When the third side 5c of the substrate 5 is brought close to the first mounting surface 60a, the hook 61 is inserted into the hanging hole 51, and the supported portion 51a is placed on the supporting portion 611a of the protruding base 611 (see FIGS. 6, 7 and 11).

[0060] In this embodiment, the lower edge of the protruding base 611 of the hook 61 is a guide portion 611b that guides a part of the substrate 5 in a predetermined direction (see FIGS. 3, 5, and 6). The guide portion 611b is inclined obliquely downward from the tip side of the protruding base 611 toward the base side.

[0061] The edge of the second side 5b of the hook hole 51 in the substrate 5 is a guided portion 51b that is guided by the guiding portion 611b (see FIGS. 5 and 6).

[0062] By bringing the third side 5c of the board 5 closer to the mounting portion 6 before the fourth side 5d of the board 5, the worker can first focus on ensuring that the first wire harness 8a does not get pinched between the mounting portion 6 and the board 5.

[0063] When the substrate 5 is brought closer to the mounting surface 60 with the first direction D10 of the substrate 5 aligned with the vertical direction D1 and the hook 61 is inserted into the hanging hole 51, the guiding portion 611b guides the guided portion 51b of the substrate 5 diagonally downward (see FIG. 6). As a result, the substrate 5 approaches the mounting position in the vertical direction D1, and the supported portion 51a of the substrate 5 is placed on the supporting portion 611a of the hook 61.

[0064] By placing the supported portion 51a on the supporting portion 611a of the protruding base portion 611, the substrate 5 is positioned approximately at the mounting position in the longitudinal direction D1 and the width direction D2.

[0065] After the supported portion 51a is placed on the supporting portion 611a, the fourth side 5d of the board 5 is brought close to the second mounting surface 60b while avoiding the second wire harness 8b (see FIG. 11). As a result, the fitting protrusion 64 and the fitting hole 53 fit together, and the entire board 5 is positioned at the mounting position.

[0066] When the fourth edge 5d of the substrate 5 is brought closer to the second mounting surface 60b after the supported portion 51a is supported by the supporting portion 611a, the worker can focus on ensuring that the second wire harness 8b is not pinched between the mounting portion 6 and the substrate 5.

[0067] After the entire substrate 5 is positioned at the mounting position, a plurality of screws 7 are inserted into the plurality of screw insertion holes 52 and fastened into the plurality of fastening holes 62 .

[0068] A first screw insertion hole 52a, which is one of the plurality of screw insertion holes 52, is formed between the hanging hole 51 and the third side 5c of the substrate 5 (see FIG. 4).

[0069] The multiple fastening holes 62 include a first fastening hole 62a corresponding to the first screw insertion hole 52a (see FIGS. 3 and 4). The first fastening hole 62a is formed adjacent to the hook 61 in the width direction D2 (see FIGS. 3 and 4).

[0070] For example, the first of the plurality of screws 7 is fastened through the first screw insertion hole 52a into the first fastening hole 62a, thereby temporarily fastening the substrate 5 in the mounting position.

[0071] A second screw insertion hole 52b, which is another one of the plurality of screw insertion holes 52, is formed between the fitting hole 53 and the third side 5c of the substrate 5 (see FIGS. 8 and 9).

[0072] The multiple fastening holes 62 include a second fastening hole 62b corresponding to the second screw insertion hole 52b (see FIG. 8). The second fastening hole 62b is formed adjacent to the fitting protrusion 64 in the width direction D2 (see FIG. 8).

[0073] The second of the plurality of screws 7 is fastened through the second screw insertion hole 52b into the second fastening hole 62b, whereby the substrate 5 is temporarily fixed in the mounting position with higher accuracy.

[0074] By adopting the board mounting structure 50, it is possible to easily mount the board 5 on the mounting surface 60 along the vertical direction D1 while preventing the electric wires 80 of the multiple wire harnesses 8 from being pinched between the board 5 and the mounting portion 6.

[0075] [Notes on the Invention] The following is a summary of the invention extracted from the above-described embodiment. Note that the configurations and processing functions described in the following supplementary notes can be selected and combined as desired.

[0076] <Appendix 1> a substrate having a first side and a second side that define both edges in a first direction, and a third side and a fourth side that define both edges in a second direction that intersects with the first direction; a mounting portion having a mounting surface formed along a vertical direction, to which the substrate is attached with the first side of the substrate facing upward and the first surface of the substrate facing the mounting surface; a plurality of screws for fixing the substrate to the mounting portion; The substrate is a hook hole formed in a portion of an edge portion along the first side near the third side and through which a part of the mounting portion is inserted; a plurality of screw insertion holes through which the plurality of screws are inserted, The mounting portion is a hook that protrudes from the mounting surface and is inserted into the hanging hole to support a supported portion that is an edge portion of the first side of the hanging hole in the board; a plurality of fastening holes into which the plurality of screws inserted into the plurality of screw insertion holes of the substrate are fastened, respectively; a rotation restricting portion that restricts rotation of the substrate about the hook inserted into the hanging hole by contacting an outer edge of the substrate while the hook supports the supported portion of the substrate, The hook is a protruding base portion that protrudes from the mounting surface and supports the supported portion of the substrate; a separation restriction portion that protrudes upward from a tip end portion of the protruding base and restricts movement of the supported portion supported by the protruding base in a direction away from the mounting surface, a dimension of the hanging hole in the first direction of the base plate is larger than a dimension of the hook in the up-down direction; a plurality of wire harnesses are routed from the mounting portion side to the second surface of the board via the outside of the third side and the fourth side of the board; A board mounting structure in which the board is brought close to the mounting surface with the first direction of the board aligned with the vertical direction, so that the hook is inserted into the hanging hole and the supported portion is placed on the protruding base.

[0077] <Appendix 2> the substrate has a fitting hole formed in a portion of an edge along the second side near the third side, The substrate mounting structure described in Appendix 1, wherein the mounting portion has a mating protrusion that protrudes from the mounting surface and fits into the mating hole.

[0078] <Appendix 3> the mounting portion is a sheet metal member, The board mounting structure according to Addendum 2, wherein the mating convex portion is a convex portion formed by half punch processing.

[0079] <Appendix 4> a lower edge portion of the protruding base portion forms a guide portion that is inclined obliquely downward from a tip side of the protruding base portion toward a base side thereof, A board mounting structure described in any one of Addendum 1 to Addendum 3, wherein when the hook is inserted into the hanging hole by bringing the board close to the mounting surface with the first direction of the board aligned with the vertical direction, the guiding portion guides the guided portion, which is the edge portion of the second side of the hanging hole on the board, diagonally downward.

[0080] <Appendix 5> A board mounting structure described in any one of Addendum 1 to Addendum 4, wherein one of the plurality of screw insertion holes is formed between the hanging hole and the third edge of the board.

[0081] <Appendix 6> The substrate mounting structure according to any one of Addendum 1 to Addendum 5, wherein the rotation restricting portion contacts the second edge of the substrate.

[0082] <Appendix 7> The substrate mounting structure according to any one of Addendum 1 to Addendum 6, wherein the first direction of the substrate is the longitudinal direction of the substrate.

[0083] <Appendix 8> a sheet conveying device that conveys a sheet; a printing device for forming an image on the conveyed sheet; An image forming apparatus comprising: a board mounting structure according to any one of Addendum 1 to Addendum 7 for mounting a board that controls the sheet transport device or the printing device. [Explanation of symbols]

[0084] 5: Substrate 5a: First side 5b: Second side 5c: Third side 5d: Fourth side 5x: First side of the board 5y: Second side of the board 6: Mounting part 7: Screws 8: Wire harness 10: Image forming device 50: Board mounting structure 51: Hanging hole 52: Screw insertion hole 53: Fitting hole 54: Connector 60: Mounting surface 61: Hook 62: Fastening hole 63: Rotation restriction part 64: Fitting protrusion 80:Electric wire 81: Connector 611:Protruding base 611a: Support part 611b: Information department 612: Distance control unit

Claims

1. a substrate having a first side and a second side that define both edges in a first direction, and a third side and a fourth side that define both edges in a second direction that intersects with the first direction; a mounting portion having a mounting surface formed along a vertical direction, to which the substrate is attached with the first side of the substrate facing upward and the first surface of the substrate facing the mounting surface; a plurality of screws for fixing the substrate to the mounting portion; The substrate is a hook hole formed in a portion of an edge portion along the first side near the third side, through which a part of the mounting portion is inserted; a plurality of screw insertion holes through which the plurality of screws are inserted, The mounting portion is a hook that protrudes from the mounting surface and is inserted into the hanging hole to support a supported portion that is an edge portion of the first side of the hanging hole in the board; a plurality of fastening holes into which the plurality of screws inserted into the plurality of screw insertion holes of the substrate are fastened, respectively; a rotation restricting portion that restricts rotation of the substrate about the hook inserted into the hanging hole by contacting an outer edge of the substrate while the hook supports the supported portion of the substrate, The hook is a protruding base portion that protrudes from the mounting surface and supports the supported portion of the substrate; a separation restriction portion that protrudes upward from a tip end portion of the protruding base and restricts movement of the supported portion supported by the protruding base in a direction away from the mounting surface, a dimension of the hanging hole in the first direction of the base plate is larger than a dimension of the hook in the up-down direction; a plurality of wire harnesses are routed from the mounting portion side to the second surface of the board via the outside of the third side and the fourth side of the board; A board mounting structure in which the board is brought close to the mounting surface with the first direction of the board aligned with the vertical direction, so that the hook is inserted into the hanging hole and the supported portion is placed on the protruding base.

2. the substrate has a fitting hole formed in a portion of an edge along the second side near the third side, The board mounting structure according to claim 1 , wherein the mounting portion has a fitting protrusion that protrudes from the mounting surface and fits into the fitting hole.

3. the mounting portion is a sheet metal member, 3. The board mounting structure according to claim 2, wherein said fitting convex portion is a convex portion formed by half punch processing.

4. a lower edge portion of the protruding base portion forms a guide portion that is inclined obliquely downward from a tip side of the protruding base portion toward a base side thereof, 4. A circuit board mounting structure as described in any one of claims 1 to 3, wherein when the hook is inserted into the hanging hole by bringing the circuit board close to the mounting surface with the first direction of the circuit board aligned with the vertical direction, the guiding portion guides the guided portion, which is the edge portion of the second side of the hanging hole on the circuit board, diagonally downward.

5. 4. The circuit board mounting structure according to claim 1, wherein one of the plurality of screw insertion holes is formed between the hanging hole and the third side of the circuit board.

6. The board mounting structure according to claim 1 , wherein the rotation restricting portion is in contact with the second side of the board.

7. The board mounting structure according to claim 1 , wherein the first direction of the board is a longitudinal direction of the board.

8. a sheet conveying device that conveys a sheet; a printing device for forming an image on the conveyed sheet; 4. An image forming apparatus comprising: the board mounting structure according to claim 1, for mounting a board that controls the sheet transport device or the printing device.

Images