Image reading device, image forming device

Abstract

To provide an image reading device and an image forming device that can swing a color reference member without providing a dedicated drive unit. [Solution] The image forming apparatus includes: a first reading unit provided below the contact glass of the document table so as to be movable along the sub-scanning direction D5; an ADF that transports a document via the reading position of the image of the surface of the document by the first reading unit; a second reading unit provided at the reading position in the ADF and reading the image of the back surface of the document transported by the ADF; a white reference plate 42 provided at a position on the document table opposite to the second reading unit; a first coil spring 44 that biases the white reference plate 42 in the first biasing direction D6; and a pressing member 43 that presses the white reference plate 42 in the pressing direction D7 when the first reading unit passes below the white reference plate 42.

Description

Technical Field

[0001] The present invention relates to an image reading apparatus and an image forming apparatus.

Background Art

[0002] An image reading apparatus capable of reading images on both sides of a document conveyed by a document conveyance unit such as an ADF is known. For example, this type of image reading apparatus includes a document table, a first reading unit, the document conveyance unit, a second reading unit, and a white reference plate. The document table has a document placement surface on which a document is placed. The first reading unit is provided so as to be movable along the sub-scanning direction below the document placement surface, and reads an image of the document placed on the document placement surface. The document conveyance unit is provided so as to be openable and closable with respect to the document table, and conveys the document through a reading position of an image of a first side of the document by the first reading unit. The second reading unit is provided in the document conveyance unit, and reads an image of a second side on the back side of the first side of the document conveyed by the document conveyance unit. The white reference plate is provided at a position facing the second reading unit, and is used for acquiring white reference data used for shading correction of an image read by the second reading unit.

[0003] Also, an image reading apparatus that swings the white reference plate when acquiring the white reference data is known as a related art (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the image reading apparatus according to the above-described related art, it is necessary to provide a dedicated drive unit for swinging the white reference plate.

[0006] The object of the present invention is to provide an image reading device and an image forming device that can swing a color reference member without providing a dedicated drive unit. [Means for solving the problem]

[0007] An image reading device according to one aspect of the present invention comprises a document table, a first reading unit, a document transport unit, a second reading unit, a color reference member, a first biasing unit, and a pressing unit. The document table has a document placement surface on which a document is placed. The first reading unit is provided below the document placement surface so as to be movable along a first direction and reads the image of the document placed on the document placement surface. The document transport unit is provided so as to be openable and closable relative to the document table and transports the document via the reading position of the first surface image of the document by the first reading unit. The second reading unit is provided at the reading position in the document transport unit and reads the image of the second surface on the back side of the first surface of the document transported by the document transport unit. The color reference member is provided at a position on the document table opposite the second reading unit and is used to acquire color reference data used for shading correction of the image read by the second reading unit. The first biasing unit biases the color reference member in a second direction perpendicular to the first direction. The pressing unit is provided on the first reading unit and contacts the color reference member when the first reading unit passes below the color reference member, pressing the color reference member in a third direction opposite to the second direction.

[0008] An image forming apparatus according to another aspect of the present invention comprises the image reading device and an image forming unit. The image forming unit forms the image read by the image reading device onto a sheet. [Effects of the Invention]

[0009] According to the present invention, the color reference member can be oscillated without providing a dedicated drive unit. [Brief explanation of the drawing]

[0010] [Figure 1]Figure 1 is a block diagram showing the system configuration of an image forming apparatus according to an embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view showing the configuration of the ADF and image reading unit of an image forming apparatus according to an embodiment of the present invention. [Figure 3] Figure 3 is a perspective view showing the configuration of the ADF and image reading unit of an image forming apparatus according to an embodiment of the present invention. [Figure 4] Figure 4 is a perspective view showing the configuration of the first reading unit of an image forming apparatus according to an embodiment of the present invention. [Figure 5] Figure 5 is a perspective view showing the configuration of the pressing member of an image forming apparatus according to an embodiment of the present invention. [Figure 6] Figure 6 is a perspective view showing the configuration of a white reference plate in an image forming apparatus according to an embodiment of the present invention. [Figure 7] Figure 7 is a perspective view showing the configuration of the white reference plate and the first reading unit of an image forming apparatus according to an embodiment of the present invention. [Figure 8] Figure 8 is a perspective view showing the configuration of the white reference plate and pressing member of an image forming apparatus according to an embodiment of the present invention. [Figure 9] Figure 9 is a bottom view showing the configuration of the white reference plate and pressing member of an image forming apparatus according to an embodiment of the present invention. [Modes for carrying out the invention]

[0011] The embodiments of the present invention will be described below with reference to the attached drawings. Note that the following embodiments are merely examples of the present invention and do not limit the technical scope of the present invention.

[0012] [Configuration of the image forming apparatus 100] First, with reference to Figure 1, the configuration of the image forming apparatus 100 according to an embodiment of the present invention will be described.

[0013] For convenience of explanation, when the image forming apparatus 100 is in an installable state where it can be used, the vertical direction is defined as the up-down direction D1 (see FIG. 2). Further, the front-back direction D2 is defined with the front side (front surface) of the image forming apparatus 100 shown in FIG. 2 being the front. Further, the left-right direction D3 is defined with reference to the front of the image forming apparatus 100 in the installable state.

[0014] The image forming apparatus 100 is a multifunction device having a plurality of functions such as a fax function and a copy function, together with a scan function for reading an image from a document and a print function for forming an image based on image data. Note that the image forming apparatus of the present invention may be a printer, a fax device, a copy machine, or the like.

[0015] As shown in FIG. 1, the image forming apparatus 100 includes an ADF (Auto Document Feeder) 1, an image reading unit 2, an image forming unit 3, a paper feeding unit 4, an operation display unit 5, a storage unit 6, and a control unit 7.

[0016] The ADF 1 conveys the document to be read by the scan function.

[0017] The image reading unit 2 realizes the scan function. Specifically, the image reading unit 2 reads an image from the document conveyed by the ADF 1. Further, the image reading unit 2 reads an image from the document placed on the document table 31 (see FIG. 3).

[0018] The image forming unit 3 realizes the print function. For example, the image forming unit 3 forms an image on a sheet supplied from the paper feeding unit 4 by an electrophotographic method. For example, the image forming unit 3 includes a photosensitive drum, a charging roller, an optical scanning device, a developing device, a transfer roller, a cleaning device, a fixing device, and a paper discharge tray. The image forming unit 3 forms the image read by the image reading unit 2 on the sheet. Note that the image forming unit 3 may form an image on the sheet by an image forming method different from the electrophotographic method, such as an inkjet method.

[0019] The paper feeding unit 4 supplies sheets to the image forming unit 3. For example, the paper feeding unit 4 includes a paper feed cassette, a manual feed tray, a sheet transport path, and a plurality of transport rollers.

[0020] The operation display unit 5 is the user interface of the image forming apparatus 100. For example, the operation display unit 5 has a display unit such as a liquid crystal display that displays various information in response to control instructions from the control unit 7, and an operation unit such as operation keys or a touch panel that inputs various information to the control unit 7 in response to user operations.

[0021] The memory unit 6 is a non-volatile storage device. For example, the memory unit 6 is a non-volatile memory such as flash memory, an SSD (Solid State Drive), or an HDD (Hard Disk Drive).

[0022] The control unit 7 comprehensively controls the image forming apparatus 100. As shown in Figure 1, the control unit 7 comprises a CPU 11, a ROM 12, and a RAM 13. The CPU 11 is a processor that performs various arithmetic operations. The ROM 12 is a non-volatile memory device in which information such as control programs for causing the CPU 11 to perform various operations is pre-stored. The RAM 13 is a volatile or non-volatile memory device used as temporary storage memory (work area) for the various operations performed by the CPU 11. In the control unit 7, the CPU 11 executes various control programs pre-stored in the ROM 12. In this way, the control unit 7 comprehensively controls the image forming apparatus 100.

[0023] [Configuration of ADF1 and image reading unit 2] Next, the configuration of the ADF1 and the image reading unit 2 will be described with reference to Figures 1 to 3. Here, Figure 3 is a perspective view showing the configuration of the ADF1 and the image reading unit 2 in the open state. Note that in Figure 3, the first reading unit 32 on the lower side of the contact glass 41 is shown by a dashed line.

[0024] As shown in Figures 2 and 3, the ADF1 is provided above the document tray 31 of the image reading unit 2. The ADF1 is also provided so as to be openable and closable relative to the document tray 31. Specifically, the ADF1 is rotatably supported by a pair of hinges provided at the rear end of the document tray 31. This allows the ADF1 to change its orientation between a closed position that covers the document tray 31 (see Figure 2) and an open position that exposes the document tray 31 (see Figure 3). The ADF1 is an example of the document transport unit of the present invention. The ADF1 and the image reading unit 2 are examples of the image reading device of the present invention.

[0025] As shown in Figure 2, the ADF1 comprises a document tray 21, a housing 22, a pickup roller 23, a paper feed belt 24, a separation roller 25, a plurality of transport rollers 26, and an output tray 27.

[0026] The document to be transported is placed on the document tray 21. The ADF1 transports the document placed on the document tray 21 in the transport direction D4 shown in Figure 2.

[0027] The document tray 21 is provided with a lift plate (not shown). The lift plate lifts the stack of documents placed on the document tray 21 to a position where it contacts the pickup roller 23.

[0028] The housing 22 houses rollers and other components used for transporting documents. As shown in Figure 2, a transport path 22A for guiding documents is formed inside the housing 22. The transport path 22A runs from the document tray 21 through the opening 22B (see Figures 2 and 3) to the output tray 27. In the ADF1, documents placed on the document tray 21 are transported through the transport path 22A to the output tray 27.

[0029] As shown in Figures 2 and 3, an opening 22B is provided at the bottom of the housing 22. The opening 22B exposes a portion of the transport path 22A to the outside. At the opening 22B, the first reading unit 32 of the image reading unit 2 (see Figures 1 and 2) reads the image of the surface of the document being transported by the ADF 1 (an example of the first surface of the present invention). The opening 22B is an example of a reading position of the present invention.

[0030] The pickup roller 23 is located above the document tray 21. The pickup roller 23 contacts the surface (top surface) of the uppermost document in the stack of documents lifted by the lift plate, and transports the document in the transport direction D4.

[0031] The paper feed belt 24 is provided in the transport path 22A. The paper feed belt 24 contacts the surface of the document being transported in the transport direction D4 by the pickup roller 23 and transports the document downstream in the transport direction D4.

[0032] The separation roller 25 is located below the paper feed belt 24 and in contact with the paper feed belt 24. The separation roller 25 separates the document that comes into contact with the paper feed belt 24 from the documents below it, among the multiple documents being transported to the contact position with the paper feed belt 24.

[0033] Multiple transport rollers 26 are arranged along the transport path 22A at intervals from each other. Each transport roller 26 transports the document toward the output tray 27.

[0034] The output tray 27 is loaded with documents that have been transported through the transport path 22A.

[0035] As shown in Figures 1 to 3, the image reading unit 2 comprises a document tray 31, a first reading unit 32, a second reading unit 33, and a drive unit 34.

[0036] The document to be scanned is placed on the document tray 31. The document tray 31 is located on the upper part of the housing of the image forming apparatus 100.

[0037] As shown in Figures 2 and 3, the document glass 31 includes a contact glass 41 (an example of a document placement surface in the present invention) and a white reference plate 42 (an example of a color reference member in the present invention). A document whose image is to be read by the first reading unit 32 is placed on the contact glass 41. The white reference plate 42 is provided at a position on the document glass 31 facing the second reading unit 33 (see Figure 2). Specifically, the white reference plate 42 is provided on the upper surface of the contact glass 41. As shown in Figure 2, when the ADF 1 is closed to the document glass 31, the contact glass 41 and the white reference plate 42 face the opening 22B of the housing 22 and form part of the transport path 22A. The white reference plate 42 is used to acquire white reference data (an example of color reference data in the present invention) used for shading correction of the image read by the second reading unit 33.

[0038] The shading correction is a process to remove density unevenness in the image read by the second reading unit 33 in the main scanning direction, which is caused by variations in the amount of light emitted in the main scanning direction (the same direction as the front-to-back direction D2) of the light source of the second reading unit 33, and variations in the light receiving sensitivity of the photodetector of the second reading unit 33 in the main scanning direction.

[0039] The first reading unit 32 is located below the contact glass 41. As shown in Figure 3, the first reading unit 32 is elongated in the main scanning direction and is movably mounted along the sub-scanning direction D5 (the same direction as the left-right direction D3) (an example of the first direction of the present invention). The first reading unit 32 reads the image of the document placed on the contact glass 41. The first reading unit 32 is also positioned to the left of the white reference plate 42 and facing the opening 22B of the ADF 1, and reads the image of the surface of the document being transported by the ADF 1. Specifically, the first reading unit 32 comprises a CIS (Contact Image Sensor) and a housing that accommodates the CIS. The first reading unit 32 outputs an analog signal corresponding to the image read from the document. The analog signal output from the first reading unit 32 is converted into a digital signal (image data) by an analog front-end circuit (not shown) and input to the control unit 7.

[0040] The second reading unit 33 is provided in the opening 22B of the ADF 1. The second reading unit 33 reads the image of the back side (an example of the second side of the present invention) of the document transported by the ADF 1. The second reading unit 33 also reads the image of the white reference plate 42. Specifically, the second reading unit 33 is a CIS. The second reading unit 33 outputs an analog signal corresponding to the image read from the document or the white reference plate 42. The analog signal corresponding to the image of the document output from the second reading unit 33 is converted into a digital signal (image data) by the analog front-end circuit and input to the control unit 7. The analog signal corresponding to the image of the white reference plate 42 output from the second reading unit 33 is converted into the white reference data by the analog front-end circuit.

[0041] The drive unit 34 moves the first reading unit 32 along the sub-scanning direction D5. Specifically, the drive unit 34 is a motor. The first reading unit 32 receives rotational driving force supplied from the drive unit 34 via a driving force transmission mechanism (not shown) and moves along the sub-scanning direction D5.

[0042] Incidentally, an image reading device that shakes the white reference plate 42 when acquiring the aforementioned white reference data is known as a related technology.

[0043] In the image reading device relating to the above-mentioned related technologies, it is necessary to provide a dedicated drive unit for swinging the white reference plate 42.

[0044] In contrast, in the image forming apparatus 100 according to an embodiment of the present invention, as described below, it is possible to swing the white reference plate 42 without providing a dedicated drive unit.

[0045] Specifically, in the image forming apparatus 100, the white reference plate 42 is provided so as to be movable along the main scanning direction.

[0046] Furthermore, the image reading unit 2 includes a pressing member 43 (an example of the pressing member of the present invention) as shown in Figure 4.

[0047] [Configuration of the white reference plate 42 and the pressing member 43] The configuration of the white reference plate 42 and the pressing member 43 will be described below with reference to Figures 3 to 9. Here, Figure 4 is a perspective view of the rear end 32A of the first reading unit 32 seen from above. Figure 5 is a perspective view of the pressing member 43 seen from above. Figure 6 is a perspective view of the white reference plate 42 seen from below. Figure 7 is a perspective view of the white reference plate 42 and the rear end 32A of the first reading unit 32 seen from above. Figure 8 is a perspective view of the white reference plate 42 and the pressing member 43 seen from below. Note that in Figure 6, the upper configuration of the contact glass 41 is shown by a dashed line.

[0048] As shown in Figures 6 and 7, the white reference plate 42 includes a support portion 61, a guide portion 62, a contact portion 63, and a spring connecting portion 64.

[0049] The support portion 61 is formed in a long, flat plate shape in the direction of the main scanning.

[0050] As shown in Figure 7, the guide portion 62 is provided on the upper surface of the support portion 61. The guide portion 62 is elongated in the main scanning direction. The guide portion 62 guides the document being transported by the ADF 1 when the ADF 1 is closed relative to the document glass 31. The guide portion 62 is colored white. The white reference data is generated based on the image read from the guide portion 62 by the second reading unit 33. The guide portion 62 may be colored a color other than white. In other words, the color reference data of the present invention may be data showing an image of the guide portion 62 of a color other than white.

[0051] As shown in Figure 6, the contacted portion 63 is the lower surface portion 61A of the support portion 61, and is provided on the rear end side of the support portion 61. The contacted portion 63 is provided projecting downward from the lower surface portion 61A. The contacted portion 63 contacts the protruding portion 54 of the pressing member 43 (see Figure 4).

[0052] As shown in Figure 6, the spring connecting portion 64 is located on the lower surface portion 61A of the support portion 61 and is provided at the rear end of the support portion 61. The spring connecting portion 64 is connected to the first coil spring 44 (see Figure 6).

[0053] The image reading unit 2 further includes a first coil spring 44 (an example of the first biasing unit of the present invention) as shown in Figure 6. As shown in Figure 6, the first coil spring 44 is elongated in the front-rear direction D2. The first coil spring 44 biases the white reference plate 42 in a first biasing direction D6 (see Figure 6) (an example of the second direction of the present invention) which is perpendicular to the sub-scanning direction D5. One end of the first coil spring 44 is connected to a spring connecting portion 64 of the white reference plate 42. The other end of the first coil spring 44 is connected to a spring connecting portion 31A (see Figure 6) provided on the document table 31.

[0054] Furthermore, the movement of the support portion 61 in the first biasing direction D6 due to the biasing force of the first coil spring 44 is locked by a locking portion 31B (see Figure 6) provided on the document table 31 so as to be in contact with the rear end of the support portion 61.

[0055] As shown in Figure 4, the pressing member 43 is located at the rear end 32A (see Figure 3) of the first reading unit 32 and is provided on the upper surface 32B (see Figure 4) of the first reading unit 32. When the first reading unit 32 passes below the white reference plate 42, the pressing member 43 contacts the contacted portion 63 of the white reference plate 42 and presses the white reference plate 42 in a pressing direction D7 (see Figure 8) (an example of a third direction in the present invention) opposite to the first biasing direction D6.

[0056] As shown in Figure 5, the pressing member 43 comprises a cylindrical portion 51, a rotating shaft 52, a first support portion 53, a protruding portion 54, a second support portion 55, and a spring connecting portion 56. The cylindrical portion 51 is formed in a cylindrical shape with an elongated length in the vertical direction D1. The rotating shaft 52 is provided protruding downward from the lower surface of the cylindrical portion 51. The first support portion 53 is provided protruding radially from the upper surface of the cylindrical portion 51 in the direction of the rotating shaft 52. The protruding portion 54 is provided protruding upward from the protruding tip of the first support portion 53. The second support portion 55 is provided protruding radially from the upper surface of the cylindrical portion 51 in a direction different from the protruding direction of the first support portion 53. The spring connecting portion 56 is provided below the protruding tip of the second support portion 55. The spring connection portion 56 is connected to the second coil spring 45 (see Figure 4).

[0057] The pressing member 43 is rotatably supported on the upper surface 32B of the first reading section 32, with respect to the rotation axis 52. Specifically, the rotation axis 52 of the pressing member 43 is rotatably supported by a bearing portion (not shown) formed on the upper surface 32B of the first reading section 32.

[0058] As shown in Figure 7, the protrusion 54 of the pressing member 43 is provided so as to protrude upward from the upper surface 32B of the first reading unit 32. The protrusion 54 is positioned in a first position (see Figure 8) facing the contacted portion 63 of the white reference plate 42 in the sub-scanning direction D5. The protrusion 54 can also move from the first position to a second position (see Figure 9) by rotating the pressing member 43 around the rotation axis 52.

[0059] The image reading unit 2 further includes a second coil spring 45 (an example of the second biasing unit of the present invention) as shown in Figure 4. As shown in Figure 4, the second coil spring 45 is elongated in the sub-scanning direction D5. The second coil spring 45 biases the pressing member 43 in the second biasing direction D9 as shown in Figure 4. One end of the second coil spring 45 is connected to a spring connecting portion 56 of the pressing member 43. The other end of the second coil spring 45 is connected to a spring connecting portion 32C (see Figure 4) provided on the upper surface portion 32B of the first reading unit 32.

[0060] In the image forming apparatus 100, the pressing member 43 is rotatably supported on the upper surface 32B of the first reading unit 32, around the rotation axis 52. As a result, the biasing force of the second coil spring 45 is converted into a biasing force that biases the protruding portion 54 in the third biasing direction D10 (see Figure 9). The third biasing direction D10 is the direction from the second position to the first position.

[0061] In the image forming apparatus 100 having the above configuration, when the first reading unit 32 is moved in a movement direction D8 (see Figure 3) along the sub-scanning direction D5 and positioned opposite the opening 22B of the ADF1, the white reference plate 42 swings along the main scanning direction.

[0062] Specifically, the pressing member 43 of the first reading unit 32 contacts the contacted portion 63 of the white reference plate 42 as it passes below the white reference plate 42, pressing the contacted portion 63 in the pressing direction D7 (see Figure 8). As a result, the white reference plate 42 moves in the pressing direction D7 against the biasing force of the first coil spring 44 (see Figure 8). Furthermore, as the pressing member 43 passes below the white reference plate 42, the white reference plate 42 moves in the first biasing direction D6 until it contacts the locking portion 31B (see Figure 6) due to the biasing force of the first coil spring 44.

[0063] In other words, in the image forming apparatus 100, the white reference plate 42 is oscillated by the rotational driving force of the drive unit 34. Therefore, in the image forming apparatus 100, it is possible to oscillate the white reference plate 42 without providing a dedicated drive unit.

[0064] Furthermore, in the image forming apparatus 100, the white reference plate 42 can be oscillated while the first reading unit 32, which reads the image of the document transported by the ADF 1, is moving. In other words, in the image forming apparatus 100, the white reference plate 42 can be oscillated immediately before the execution of the process of reading the image of the document transported by the ADF 1.

[0065] Furthermore, in the image forming apparatus 100, the protruding portion 54 of the pressing member 43 is provided to be movable between a first position facing the contacted portion 63 of the white reference plate 42 in the sub-scanning direction D5 and a second position retracted from the first position. In addition, in the image forming apparatus 100, the protruding portion 54 of the pressing member 43 is biased in a third biasing direction D10 (see Figure 9) from the second position toward the first position by a second coil spring 45. This makes it possible to retract the pressing member 43 from the first position to the second position when the protruding portion 54 of the pressing member 43 comes into contact with the contacted portion 63 of the white reference plate 42 if, for some reason, the white reference plate 42 does not move in the pressing direction D7 from the contacted position with the locking portion 31B. Therefore, it is possible to avoid damage to the protruding portion 54 or the contacted portion 63 due to contact between the protruding portion 54 and the contacted portion 63.

[0066] [Notes on the invention] The following is an overview of the invention extracted from the above-described embodiments. Note that each configuration and processing function described below can be selected and combined as desired.

[0067] <Note 1> Image reading device comprising: a document tray having a document placement surface on which a document is placed; a first reading unit provided below the document placement surface so as to be movable along a first direction and for reading an image of the document placed on the document placement surface; a document transport unit provided so as to be openable and closable with respect to the document tray and for transporting the document via the reading position of the first surface of the document by the first reading unit; a second reading unit provided at the reading position in the document transport unit and for reading an image of the second surface on the back of the first surface of the document transported by the document transport unit; a color reference member provided at a position on the document tray opposite to the second reading unit and used for acquiring color reference data used for shading correction of the image read by the second reading unit; a first biasing unit that biases the color reference member in a second direction perpendicular to the first direction; and a pressing unit provided in the first reading unit that contacts the color reference member when the first reading unit passes below the color reference member and presses the color reference member in a third direction opposite to the second direction.

[0068] <Note 2> The pressing portion has a protruding portion that protrudes upward from the upper surface of the first reading portion, and the image reading device is provided with a contacted portion that protrudes downward from the lower surface of the color reference member and contacts the protruding portion, as described in Appendix 1.

[0069] <Note 3> The image reading device according to Appendix 1 or 2, wherein the protruding portion is provided so as to be movable between a first position facing the contacted portion in the first direction and a second position retracted from the first position, and the image reading device includes a second biasing portion that biases the protruding portion in the direction from the second position toward the first position.

[0070] <Note 4> An image forming apparatus comprising an image reading device described in any of Appendix 1 to 3, and an image forming unit that forms an image read by the image reading device onto a sheet. [Explanation of Symbols]

[0071] 1 ADF 2 Image reading unit 3 Image forming unit 4 Paper feed section 5 Operation display section 6 Memory section 7 Control Unit 21 Document tray 22 enclosures 22A Conveyor path 22B opening 23 Pickup Roller 24 Paper feed belt 25 Separation Rollers 26 Conveyor rollers 27 Paper output tray 31 Manuscript Stand 32 First Reading Section 33 Second Reading Section 34 Drive unit 41 Contact Glass 42 White reference plate 43 Pressing member 44. First coil spring 45. Second coil spring 54 Protrusion 63 Contacted part 100 Image forming apparatus

Claims

1. A document tray having a document placement surface on which the document is placed, A first reading unit is provided below the document placement surface so as to be movable along a first direction, and reads the image of the document placed on the document placement surface, A document transport unit is provided so as to be openable and closable with respect to the document tray and transports the document via the reading position of the first side image of the document by the first reading unit, A second reading unit is provided at the reading position in the document transport unit and reads the image of the second side on the reverse side of the first side of the document transported by the document transport unit, A color reference member is provided in the document table at a position opposite to the second reading unit and is used to acquire color reference data used for shading correction of the image read by the second reading unit, A first biasing unit that biases the color reference member in a second direction perpendicular to the first direction, A pressing portion is provided in the first reading portion, which contacts the color reference member when the first reading portion passes below the color reference member and presses the color reference member in a third direction opposite to the second direction, An image reading device equipped with [a specific feature].

2. The pressing portion has a projection that protrudes upward from the upper surface of the first reading portion. The aforementioned image reading device is The color reference member is provided with a portion that protrudes downward from the lower surface and contacts the protruding portion, The image reading device according to claim 1.

3. The protruding portion is provided so as to be movable between a first position facing the contacted portion in the first direction and a second position retracted from the first position. The aforementioned image reading device is The system includes a second biasing member that biases the protruding portion in the direction from the second position toward the first position. The image reading device according to claim 2.

4. An image reading device according to any one of claims 1 to 3, An image forming unit that forms an image on a sheet based on the image reading device, An image forming apparatus equipped with the following features.

Images