Medium feeding device, image reading device

Abstract

Provided are a medium feeding device and an image reading device to solve the problem that even if a booklet-shaped document is intended to be inserted, it can hit the outer circumferential surface of a separation roller and cannot be fed. The medium feeding device includes a medium support section that supports a medium; a feeding roller that contacts the upper surface of the medium supported by the medium support section; a separation section that is disposed opposite the feeding roller and is capable of advancing and retreating relative to the feeding roller; a path forming member that is a member located upstream of a contact position of the feeding roller and the separation section in a medium feeding direction, is capable of advancing and retreating relative to the feeding roller according to the thickness of the medium, and narrows the medium feeding path toward the contact position by advancing relative to the feeding roller; and a first pressing section that presses the path forming member toward the feeding roller, the path forming member being capable of engaging with the separation section, the path forming member displacing the separation section in a direction away from the feeding roller when pressed in a direction of retreating from the feeding roller due to a medium having a thickness exceeding a predetermined thickness.

Description

Technical Field

[0001] The present invention relates to a medium feeding device for feeding a medium, and an image reading device having the medium feeding device. Background Technology

[0002] As an example of an image reading device, there exists a paper-feed scanner. In such image reading devices, a structure is sometimes employed that uses a separation roller and a feed roller to hold and separate the medium. The scanner described in Patent Document 1 is configured such that the separation roller can move forward and backward relative to the feed roller. A feed roller guide is provided upstream of the contact position between the separation roller and the feed roller, configured such that the top of the placed original document will not get stuck on the feed roller.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent document 1: International Publication No. 2017 / 209174.

[0006] In scanners, sometimes not only sheet-like originals but also booklet-like originals are fed. Booklet-like originals are thicker, and even if you want to insert a booklet-like original towards the contact point between the separation roller and the feed roller, it may hit the outer circumference of the separation roller and not be able to be fed. Summary of the Invention

[0007] The media feeding apparatus of the present invention, which addresses the aforementioned problems, is characterized by comprising: a media support portion for supporting a media; a feed roller for contacting the upper surface of the media supported on the media support portion; a separation portion disposed opposite to the feed roller, the separation portion being capable of advancing and retracting relative to the feed roller; a path forming member located upstream of the contact position between the feed roller and the separation portion in the media feeding direction, the path forming member being capable of advancing and retracting relative to the feed roller according to the thickness of the media, and narrowing the media feeding path toward the contact position by advancing relative to the feed roller; and a first pressing portion for pressing the path forming member toward the feed roller, the path forming member being capable of engaging with the separation portion, and displacing the separation portion away from the feed roller when the path forming member is pressed in a direction retracting from the feed roller due to a media with a thickness exceeding a predetermined thickness.

[0008] Furthermore, the image reading apparatus of the present invention is characterized by comprising: the medium feeding device; and a reading unit for reading the medium fed by the medium feeding device. Attached Figure Description

[0009] Figure 1 This is a stereoscopic view of the scanner with the main body of the device in a normal reading posture, viewed from the front.

[0010] Figure 2 This is a stereoscopic view of the scanner's main body in its normal reading posture, viewed from the rear.

[0011] Figure 3 This is a stereoscopic view of the main body of the observation device in its normal reading posture with the scanner of the third unit open.

[0012] Figure 4 This is a stereoscopic view of the main body of the device in its normal reading posture with the scanner of the second unit open, viewed from above.

[0013] Figure 5 This is a cross-sectional view of the original document transport path of the scanner, viewed from the width direction, with the main body of the device in a normal reading posture.

[0014] Figure 6 This is a cross-sectional view of the original document transport path of the scanner, with the main body of the device in a booklet reading posture, viewed from the width direction.

[0015] Figure 7 This is a 3D view of the scanner after the back cover of the first unit has been removed, viewed from the rear.

[0016] Figure 8 This is a perspective view showing the structure of the posture switching motor and the rotation conversion unit.

[0017] Figure 9 This is a cross-sectional view of the posture switching motor and rotation conversion unit when the main body of the device is in a normal reading posture, viewed from the width direction.

[0018] Figure 10 This is a cross-sectional view of the structure of the posture switching motor and rotation conversion unit when the main body of the device is in the booklet reading posture, viewed from the width direction.

[0019] Figure 11 (A) Figure 11 (B) is a diagram showing the second posture detection sensor.

[0020] Figure 12 This is a block diagram showing the control system of the scanner.

[0021] Figure 13 This is a perspective view showing the posture-maintaining unit involved in other embodiments.

[0022] Figure 14 This is a perspective view of the first frame and the separation switching unit (first embodiment) viewed from the rear.

[0023] Figure 15 This is a side view of the roller cage.

[0024] Figure 16 It is a cross-sectional perspective view of the separating roller, roller cage, and torque limiter.

[0025] Figure 17 This is a perspective view of the separation switching unit (first embodiment) in a separated state.

[0026] Figure 18 This is a side view of the separation switching unit (first embodiment) in a separated state.

[0027] Figure 19 This is a perspective view of the separation switching unit (first embodiment) in a non-separated state.

[0028] Figure 20 This is a side view of the separation switching unit (first embodiment) in a non-separated state.

[0029] Figure 21 This is a perspective view of the separation switching unit (second embodiment) in a separated state.

[0030] Figure 22 This is a side view of the main part of the separation switching unit (second embodiment) in a separated state.

[0031] Figure 23 This is a perspective view of the separation switching unit (second embodiment) in a non-separated state.

[0032] Figure 24 This is a side view of the main part of the separation switching unit (second embodiment) in a non-separated state.

[0033] Figure 25 This is a flowchart illustrating the control process during posture switching of the main body of the device.

[0034] Figure 26 (A) Figure 26 (B) is a 3D view of the edge guide. Figure 26 (A) is a diagram showing the state with the pull-out section retracted. Figure 26 (B) is a diagram showing the state where the pull-out part has been pulled out.

[0035] Figure 27 This is a three-dimensional view showing the structure around the separating roller.

[0036] Figure 28 It shows from Figure 27 The state will guide the diagram showing the state of the component after disassembly.

[0037] Figure 29 This is a perspective view of the guide components, the placement of the guide, and the pressing rod from below.

[0038] Figure 30This is a top view showing the structure around the separating roller.

[0039] Figure 31 It is a 3D diagram of where the guide components are placed.

[0040] Figure 32 This is a perspective view showing a portion of the baffle placement mechanism and the mechanism for driving the baffle placement.

[0041] Figure 33 This is a side sectional view showing the structure around the separating roller.

[0042] Figure 34 (A) Figure 34 (B) is a diagram illustrating the action of placing the guide. Figure 34 (A) is a diagram showing the feed standby state. Figure 34 (B) is a diagram showing the state in which the separating roller has been displaced.

[0043] Figure 35 (A) Figure 35 (B) is a diagram illustrating the action of placing the guide. Figure 35 (A) is a diagram showing the state when multiple sheet-like originals are fed. Figure 35 (B) is a diagram showing the state when the booklet-shaped manuscript is being fed.

[0044] Figure 36 (A) Figure 36 (B) is a diagram illustrating another embodiment of the structure in which the guide is placed and the separation roller is pressed.

[0045] Figure 37 (A) Figure 37 (B) is a diagram illustrating the action of pressing the lever firmly. Figure 37 (A) is a diagram showing the status of the original document during its feeding process. Figure 37 (B) is a diagram showing the state in which the rear end of the fed original has disengaged from the contact position between the feed roller and the separation roller.

[0046] Figure 38 This is a diagram showing an example of the configuration of the pressing lever when multiple feed rollers are provided.

[0047] Figure 39 This is a diagram showing other embodiments of the pressing part.

[0048] Symbol Explanation

[0049] 1. Scanner; 2. Main body of the device; 3. First unit; 4. Second unit; 4a. Upper surface; 5. Third unit; 6. Main body support; 6a; 6a-1. Vertical wall; 6b. Toothed part; 6c. Main body rotation axis; 6d. Protrusion; 6e. First abutment part; 6f. Second abutment part; 6h. Cam part; 7. Operating part; 8a. Lock release part; 10. Upper opening and closing part; 11. Original document support part; 12A, 12B. Edge Edge guide; 12c, 12d, pull-out part; 13, feed inlet; 14, feed roller; 15, separation roller; 16, first conveyor roller pair; 17, first lower roller; 18, first upper roller; 20, second conveyor roller pair; 21, second lower roller; 22, second upper roller; 24, third conveyor roller pair; 25, third drive roller; 26, third driven roller; 28, fourth conveyor roller pair; 29, fourth drive roller; 30, fourth driven roller; 32. First reading unit; 32a, contact glass; 33, second reading unit; 33a, contact glass; 35, baffle; 35a, baffle rotation shaft; 35b, detected part; 37, first outlet; 38, second outlet; 40, posture switching motor; 41, rotation conversion unit; 42, worm gear; 43, gear; 44, shaft; 45, gear; 46, first compound gear; 47, second compound gear; 50, conveyor motor; 51 52. Drive pulley; 53. Belt; 60. Driven pulley; 61. Posture holding unit; 62. Protrusion; 63. Recess; 64. First frame; 63a. Boss; 63b. Supported part; 63g. Bearing part; 63h. Guide groove; 63j. Restriction part; 63k. Bearing part; 63m. Recess; 64. Second frame; 64a. Frame rotation axis; 65. Third frame; 66. Back cover; 71. First connection part (USB) 72. Second connection part (USB Type-C); 73. Third connection part (DC jack); 79. Circuit board; 80. Control unit; 81. CPU; 82. Flash ROM; 83. RAM; 84. Interface; 86. First solenoid; 87. First posture detection sensor; 88. Second posture detection sensor; 89. First rotation detection unit; 89a. Rotating circular plate; 89b. Detection unit; 90. Second rotation detection unit; 90a. Rotating circular plate; 90b. Detection unit; 91. Stacking detection unit; 92. Placement detection unit; 93. First Original document inspection unit; 94, Second original document inspection unit; 97, Roller holder; 97a, Shaft; 97b, Shaft; 97c, Third abutment part; 98, Torque limiter; 98a, Shaft; 98b, Cylindrical part; 99, First gear; 100, Separation switching unit; 101, First mechanism part; 102, Second mechanism part; 103, Connecting rod assembly; 103a, Hole; 104, Compression coil spring; 105, Guide part; 105a, Spring retainer part; 105b, Shaft; 106, Connecting shaft; 107, Second gear; 108, Third gear; 109, Fourth gear;110. Rotation limiting component; 110a. Tooth; 110b. Boss; 112. Rotating cam; 112a. First cam portion; 112b. Second cam portion; 113. Rotation limiting component; 113a. Tooth; 113b. Elongated hole; 113c. First cam follower; 113d. Second cam follower; 115. First rotating component; 115a. Tooth; 116. Second rotating component; 116a. Tooth; 116b. Boss; 150. Original document feeding device; 151. Guide component; 151a. Bearing portion; 153. Placement guide; 153a. Rotating shaft; 153b, 153c, 153d, 153e. Long rib; 153f. Short rib; 153h. Shaft portion; 153j, Fourth abutment part; 153k, Restriction part; 153m, Guide part; 153n, Fifth abutment part; 153p, Upper surface; 155, Placement baffle; 155a, Base; 155b, Shaft part; 155c, Cam follower part; 157, Pressing rod; 157a, Shaft fitting part; 157b, Top end part; 161, First spring; 162, Second spring; 163, Placement baffle cam; 164, Spring; 165, Shaft; 166, Gear; 167, One-way clutch; 170, Support part; 171, Arm part; 172, Driven roller; 500, External equipment; R1, Original document feed path; R2, Reading conveyor path; R3, Tilting conveyor path; R4, Non-tilting conveyor path. Detailed Implementation

[0050] The present invention will now be described in a general sense.

[0051] The medium feeding device according to the first embodiment is characterized by comprising: a medium support portion for supporting a medium; a feed roller for contacting the upper surface of the medium supported on the medium support portion; a separation portion disposed opposite to the feed roller, the separation portion being capable of advancing and retracting relative to the feed roller; a path forming member being a member located upstream of the contact position between the feed roller and the separation portion in the medium feeding direction, the path forming member being capable of advancing and retracting relative to the feed roller according to the thickness of the medium, and narrowing the medium feeding path toward the contact position by advancing relative to the feed roller; and a first pressing portion for pressing the path forming member toward the feed roller, the path forming member being capable of engaging with the separation portion, the path forming member causing the separation portion to displace away from the feed roller when pressed in a direction away from the feed roller due to a medium with a thickness exceeding a predetermined thickness.

[0052] According to this method, the path forming member can engage with the separating section. When the path forming member is pressed in a direction away from the feed roller due to a medium with a thickness exceeding a predetermined thickness, the separating section is displaced away from the feed roller. Therefore, in the case of feeding a medium with a thickness exceeding the predetermined thickness, the separating section leaves the feed roller before the medium enters between the separating section and the feed roller. This prevents the medium with a thickness exceeding the predetermined thickness from hitting the separating section and being unable to feed.

[0053] Furthermore, the engagement between the path forming component and the separation portion is not limited to the case where the path forming component and the separation portion directly engage, but also includes the case where the path forming component and the separation portion indirectly engage via other components.

[0054] The second method is characterized in that, in the first method, when multiple sheet-like media are supported on the media support portion, the upper surface of the path forming member provides a separation effect on the top of the media.

[0055] According to this method, when multiple sheet-like media are supported by the media support portion, the upper surface of the path forming member provides a separation effect on the top of the media. Therefore, the separation is performed using the path forming member before the media are separated by the feed roller and the separation portion, thereby enabling more reliable separation of the media.

[0056] The third approach is characterized in that, in the first or second approach, the path forming component has a plurality of ribs extending in the medium feed direction, and the plurality of ribs are arranged in a width direction that is intersecting the medium feed direction in a line symmetrical with respect to a straight line passing through the center of the medium and parallel to the medium feed direction.

[0057] According to this method, the plurality of ribs are configured to be linearly symmetrical with respect to a straight line passing through the center of the medium and parallel to the feed direction of the medium. Therefore, the frictional force applied to the medium by the path forming member is equal to that of the straight line in the width direction, thereby suppressing the oblique movement of the medium.

[0058] The fourth method is characterized in that, in the third method, in the width direction, the straight line passes through the center position of the feed roller and the center position of the separating part, and two of the plurality of ribs that are close to the straight line in the width direction are located in the width direction at positions that sandwich the separating part and are located within the area of ​​the feed roller.

[0059] According to this method, since two of the plurality of ribs closest to the straight line in the width direction are positioned to sandwich the separating portion in the width direction and are located within the area of ​​the feed roller, the medium feed path toward the contact position can be appropriately narrowed, and the number of sheets of medium toward the contact position can be appropriately limited. As a result, the separating effect of the separating portion can be appropriately obtained.

[0060] The fifth method is characterized in that, in the first or second method, the separating part is composed of a rotatable separating roller, and the path forming member engages with the separating part by abutting against a cylindrical part centered on the rotation center of the separating roller. When the thickness of the medium is less than the predetermined thickness, there is a gap between the path forming member and the cylindrical part. When the thickness of the medium exceeds the predetermined thickness, the path forming member abuts against the cylindrical part, causing the separating roller to displace away from the feed roller.

[0061] According to this method, the path forming component abuts against the cylindrical portion to shift the separating roller away from the feed roller, thereby enabling the separating roller to reliably separate from the feed roller.

[0062] The sixth method is characterized in that, in the first or second method, the separating part is composed of a rotatable separating roller, the path forming member engages with the separating part by abutting against the rotation axis of the separating roller, when the thickness of the medium is less than the predetermined thickness, there is a gap between the path forming member and the rotation axis, and when the thickness of the medium exceeds the predetermined thickness, the path forming member abuts against the rotation axis to displace the separating roller away from the feed roller.

[0063] According to this method, the path forming component abuts against the rotating shaft, causing the separating roller to shift away from the feed roller. Therefore, the separating roller can reliably leave the feed roller.

[0064] The seventh method is characterized in that, in the first or second method, the separating portion is held by a holding member that is capable of moving forward and backward relative to the feed roller, the path forming member engages with the separating portion by abutting against an abutting portion formed on the holding member, a gap exists between the path forming member and the abutting portion when the thickness of the medium is below the predetermined thickness, and when the thickness of the medium exceeds the predetermined thickness, the path forming member abuts against the abutting portion to displace the separating portion away from the feed roller.

[0065] According to this method, the path forming member displaces the separating portion away from the feed roller by abutting against the abutting portion. Here, since the abutting portion is formed in the holding member, the position of the abutting portion has a high degree of freedom, increasing design flexibility.

[0066] The eighth method is characterized in that, in the fifth method, it includes: a pressing part, which is a component capable of moving forward and backward relative to the feed roller upstream of the contact position between the feed roller and the separating roller in the medium feeding direction, wherein after the rear end of the fed medium disengages from the contact position, the pressing part can press the medium supported on the medium support part toward the feed roller; and a pressing part, which presses the pressing part toward the feed roller.

[0067] According to this method, a pressing part is provided, which can press the medium supported on the medium support part toward the feed roller after the rear end of the fed medium is disengaged from the contact position. Therefore, in the structure of feeding the medium from the uppermost layer of the stacked medium, the phenomenon of the medium returning upstream due to the reversal of the feed roller can be suppressed.

[0068] The ninth embodiment is characterized in that, in any of the first to eighth embodiments, it comprises: a main support portion placed on a mounting surface of the device; and a device body supported on the main support portion, wherein the separation portion is composed of a rotatable separation roller, the device body is mounted on the main support portion in a manner rotatable relative to the main support portion, the device body is capable of switching between a first posture and a second posture by rotation, the second posture being a posture in which the angle between the medium feed path and the mounting surface is smaller than the first posture, the device body comprising a separation switching unit capable of switching between a separation state in which the separation roller separates the medium and a non-separation state in which the separation roller does not separate the medium, the separation switching unit setting the separation roller to the separation state when the device body is in the first posture, and setting the separation roller to the non-separation state when the device body is in the second posture.

[0069] According to this method, the separation switching unit sets the separation roller to the separated state when the main body of the device is in the first posture, and sets the separation roller to the non-separated state when the main body of the device is in the second posture. Therefore, the user does not need a special operation to switch the separation roller between the separated state and the non-separated state, and the ease of use of the device is improved.

[0070] The image reading device according to the tenth method is characterized by comprising: the medium feeding device according to any one of the first to ninth methods; and a reading unit for reading the medium fed by the medium feeding device.

[0071] According to this method, the effect of any one of the first to eighth methods described above can be obtained in the image reading device.

[0072] The medium feeding device of the present invention can also be configured as follows.

[0073] The medium feeding device according to the eleventh method is characterized by comprising: a medium support portion for supporting a medium; a feed roller for contacting the upper surface of the medium supported on the medium support portion; a separation roller, which is a roller disposed opposite to the feed roller and clamps and separates the medium between the separation roller and the feed roller; a pressing portion, which is a component capable of moving forward and backward relative to the feed roller at an upstream position in the medium feeding direction relative to the contact position between the feed roller and the separation roller, and capable of pressing the medium supported on the medium support portion toward the feed roller after the rear end of the fed medium has left the contact position; and a first pressing portion for pressing the pressing portion toward the feed roller.

[0074] According to this method, a pressing part is provided, which can press the medium supported on the medium support part toward the feed roller after the rear end of the fed medium is disengaged from the contact position. Therefore, in the structure of feeding the medium from the uppermost layer of the stacked medium, the phenomenon of the medium returning upstream due to the reversal of the feed roller can be suppressed.

[0075] The twelfth method is characterized in that, in the eleventh method, the pressing part moves the top part forward and backward relative to the feed roller by rotating about a rotation axis, the rotation axis being located upstream of the top part in the medium feeding direction.

[0076] According to this method, the pressing part moves forward and backward relative to the feed roller by rotating about a rotation axis. The rotation axis is located upstream of the top part in the medium feeding direction. Therefore, the pressing part that is in contact with the medium is difficult to rotate when the medium is about to return upstream due to the reversal of the feed roller, and the phenomenon of the medium returning upstream due to the reversal of the feed roller can be effectively suppressed.

[0077] The thirteenth aspect is characterized in that, in the twelfth aspect, a limiting part is provided, which limits the rotational limit of the pressing part in the direction of the top end moving toward the feed roller.

[0078] According to this method, a limiting part is provided that restricts the rotation limit of the pressing part in the direction of the feed roller at the top end. Therefore, it is possible to set the structure such that when the medium needs to return upstream due to the reversal of the feed roller, the pressing part in contact with the medium is more reliably difficult to rotate.

[0079] The fourteenth method is characterized in that, in any of the eleventh to thirteenth methods, the pressing part is disposed in the region of the feed roller in the width direction that is intersecting the medium feeding direction.

[0080] According to this method, the pressing part is provided in the region of the feed roller in the width direction that is intersecting the medium feeding direction. Therefore, the medium can be reliably pressed against the feed roller by the pressing part, and the phenomenon of the medium returning upstream due to the reversal of the feed roller can be more reliably suppressed.

[0081] The fifteenth aspect is characterized in that, in the fourteenth aspect, the pressing portion is located at both ends in the width direction relative to the feed roller.

[0082] According to this method, since the pressing portion is located at both ends of the feed roller in the width direction, it is possible to suppress the deflection of the medium when the medium is to return upstream due to the reversal of the feed roller.

[0083] The sixteenth method is characterized in that, in the fifteenth method, the plurality of pressing portions can independently advance and retract relative to the feed roller.

[0084] If the structure consists of multiple pressing parts that move forward and backward as a single unit, the pressing state of each pressing part on the medium will differ, potentially causing the medium to slant. For example, if one pressing part is in contact with the medium while another pressing part is not, slant of the medium occurs. However, according to this method, the multiple pressing parts can move forward and backward independently relative to the feed roller, thus allowing each pressing part to press the medium appropriately, thereby suppressing the aforementioned slant.

[0085] The seventeenth embodiment is characterized in that, in any of the first to sixteenth embodiments, a path forming member is provided. This path forming member is located upstream of the contact position in the medium feeding direction and is capable of moving forward and backward relative to the feed roller according to the thickness of the medium. By moving forward relative to the feed roller, the medium feeding path toward the contact position is narrowed. In the feeding standby state, the path forming member and the pressing part abut against the feed roller. The position where the pressing part abuts against the feed roller is upstream in the medium feeding direction compared to the position where the path forming member abuts against the feed roller.

[0086] According to this method, the number of sheets of medium facing the contact position can be limited by the path forming component, thereby improving the separation effect produced by the feed roller and the separation roller.

[0087] Furthermore, the position where the pressing part abuts against the feed roller is upstream in the medium feeding direction compared to the position where the path forming part abuts against the feed roller. Therefore, when the medium needs to return upstream due to the reversal of the feed roller, the medium can be pressed firmly for a longer period of time, and the phenomenon of the medium returning upstream due to the reversal of the feed roller can be suppressed more reliably.

[0088] The eighteenth aspect is characterized in that, in the seventeenth aspect, a second pressing portion is provided to press the path forming member toward the feed roller, wherein the pressing force of the first pressing portion on the pressing portion is less than the pressing force of the second pressing portion on the path forming member.

[0089] According to this method, the pressing force of the first pressing part pressing the tight pressing part is less than the pressing force of the second pressing part pressing the path forming member. Therefore, when feeding the medium, the tight pressing part is easy to retract from the medium feeding path, and the situation where the tight pressing part obstructs the feeding of the medium can be suppressed.

[0090] The nineteenth method is characterized in that, in the eighteenth method, the path forming member can engage with the separating roller, and when the path forming member is pressed in a direction away from the feed roller due to a medium with a thickness exceeding a predetermined thickness, it causes the separating roller to displace in a direction away from the feed roller, and when the pressing part is pressed down to a state where it does not protrude from the path forming member relative to the medium feed path, it does not press the separating roller in a direction away from the feed roller.

[0091] According to this method, the path forming member can engage with the separating section. When the path forming member is pressed in a direction away from the feed roller due to a medium with a thickness exceeding a predetermined thickness, the separating section is displaced away from the feed roller. Therefore, in the case of feeding a medium with a thickness exceeding the predetermined thickness, the separating roller moves away from the feed roller before the medium enters between the separating roller and the feed roller. This prevents the medium with a thickness exceeding the predetermined thickness from hitting the separating roller and thus failing to feed.

[0092] Furthermore, the engagement between the path forming component and the separation roller is not limited to the case where the path forming component and the separation roller are directly engaged, but also includes the case where the path forming component and the separation roller are indirectly engaged via other components.

[0093] Furthermore, when the pressing part is pressed down to a state where it does not protrude from the path forming member relative to the medium feed path, it does not press the separating roller away from the feed roller. Therefore, it is possible to prevent the separating roller from leaving the feed roller at an inappropriate time.

[0094] The image reading device according to the twentieth embodiment is characterized by comprising: the medium feeding device according to any one of the eleventh to nineteenth embodiments; and a reading unit for reading the medium fed by the medium feeding device.

[0095] According to this method, the effect of any one of the methods eleven to nineteen described above can be obtained in the image reading device.

[0096] The present invention will now be described in detail.

[0097] Below, as an example of an image reading device, a scanner 1 capable of reading at least one of the first side and the opposite second side of an original document is described. Scanner 1 is a so-called paper-feeding scanner that reads while moving the original document relative to the reading unit described later.

[0098] In this specification, the term "original" includes not only sheet-like originals, but also card-like and booklet-like originals. An original is an example of a medium.

[0099] Furthermore, in the XYZ coordinate system shown in each figure, the X-axis direction is the width direction of the device, which is also the width direction of the original document. The Y-axis direction is the depth direction of the device, and the Z-axis direction is along the vertical direction.

[0100] In this embodiment, the +Y direction is defined as the direction from the back of the device toward the front surface, and the -Y direction is defined as the direction from the front surface of the device toward the back. Additionally, the left direction when viewed from the front surface of the device is defined as the +X direction, and the right direction is defined as the -X direction.

[0101] Additionally, the direction in which the original manuscript is transported is sometimes referred to as "downstream," and the opposite direction as "upstream."

[0102] exist Figure 1 , Figure 2 In this embodiment, the scanner 1 includes a document feeding device 150, which is an example of a media feeding device. In this embodiment, the document feeding device 150 is configured such that the first reading unit 32 and the second reading unit 33, described later, are removed from the scanner 1. However, from the viewpoint of feeding a document, the entire scanner 1, including the first reading unit 32 and the second reading unit 33, can also be used as the document feeding device 150.

[0103] The scanner 1 according to this embodiment includes a device body 2 and a main body support 6 that supports the device body 2 so that it can rotate.

[0104] The main body 2 of the device is configured to have a first unit 3, a second unit 4 and a third unit 5.

[0105] The second unit 4 and the third unit 5 are configured to be able to rotate around the frame axis 64a (see reference). Figure 3 The frame rotation axis 64a is a rotation axis that forms the center of the rotation axis parallel to the X-axis direction.

[0106] The second unit 4 and the third unit 5 can rotate as a unit relative to the first unit 3 about the frame rotation axis 64a (see reference). Figure 4 By rotating the second unit 4 and the third unit 5 relative to the first unit 3, it is possible to achieve the following: Figure 4 As shown, a portion of the original document transport path is exposed. In particular, the original document feed path R1 and the read transport path R2, described later, are exposed. By sliding the locking release part 8a in the -X direction, the user can release the lock of the second unit 4 relative to the first unit 3 and open the second unit 4.

[0107] In addition, the third unit 5 can rotate relative to the first unit 3 and the second unit 4 about the frame rotation axis 64a (see reference). Figure 3 By rotating the third unit 5 relative to the first unit 3 and the second unit 4, as... Figure 3 This allows a portion of the original document transport path to be exposed. In particular, it allows the flip transport path R3, described later, to be exposed.

[0108] The main body 2 of the device can rotate relative to the main body support 6 around the main body rotation axis 6c (see reference). Figure 7 , Figure 8 Rotating around a central point, in this embodiment, the device body 2 can maintain two postures by rotating. The two postures of the device body 2 are as follows: Figure 5 , Figure 6 As shown, in the future... Figure 5 The posture is called the normal reading posture. Figure 6 The posture is called the booklet reading posture. Usually, the reading posture is an example of the first posture of the device body 2, and the booklet reading posture is an example of the second posture of the device body 2.

[0109] Figure 5 The angles α1 and α1 shown Figure 6 The angles α2 shown are the angles formed by the reading and transport path R2 (described later) and the mounting surface G of the device. The angle α2 in the booklet reading posture is smaller than the angle α1 in the normal reading posture.

[0110] Under normal reading posture, the projected area of ​​the device body 2 onto the mounting surface G of the scanner 1 is minimized, which is the posture in which the device body 2 occupies the least space.

[0111] Furthermore, the space occupied in this specification refers to the area occupied by the main body 2 of the device in the XY plane when viewed from above.

[0112] The standard reading posture is suitable for reading sheet-like originals, that is, originals with low rigidity and easy to bend. The booklet reading posture is suitable for reading originals with high rigidity and difficult to bend, such as plastic cards and booklets.

[0113] The front surface of the device is provided with an operation section 7 consisting of multiple operation buttons, including a power button.

[0114] In addition, such as Figure 2 As shown, a first connecting portion 71, a second connecting portion 72, and a third connecting portion 73 are provided on the sides in the +X direction surrounding the device. The first connecting portion 71 is a connector that connects to a USB Type-A plug (not shown), for example, as a connection target. The second connecting portion 72 is a connector that connects to a USB Type-C plug (not shown), for example, as a connection target. The third connecting portion 73 is a connector that connects to a power plug (not shown) for supplying power to the device body 2.

[0115] In addition, USB is short for Universal Serial Bus, and Type-A and Type-C are two of the several types defined in the USB standard.

[0116] In addition to connecting external devices via a USB cable (not shown), the first connection unit 71 can also connect storage media such as a USB memory (not shown). Furthermore, the control unit 80 (see reference...) Figure 12 It can save the read data to a storage medium connected to the first connection part 71.

[0117] Additionally, an external device can be connected to the second connection part 72 via a USB cable (not shown).

[0118] The first connecting portion 71, the second connecting portion 72, and the third connecting portion 73 are disposed on the circuit board 79 located on the back side of the device (see reference). Figure 7 )superior.

[0119] Furthermore, in this embodiment, the device body 2 is configured to receive power from an external device connected to the second connection portion 72.

[0120] Next, refer to Figure 5 , Figure 6The structure of the original document transport path in scanner 1 will be described. The original document being fed is supported at an angle by the original document support 11. The symbol P represents the supported original document. When multiple original documents are supported by the original document support 11, the uppermost original document is fed downstream by the feed roller 14. The feed roller 14 is in contact with the upper surface of the original document supported by the original document support 11.

[0121] The original manuscript support part 11 is formed on the upper opening and closing part 10. The upper opening and closing part 10 can rotate about a rotation axis (not shown) to open and close the feed port 13 by rotation. Figure 1 This indicates that the upper opening / closing part 10 is closed. Figure 2 This shows the state where the upper opening / closing part 10 is open. The upper opening / closing part 10 constitutes the first unit 3.

[0122] like Figure 3 As shown, a pair of edge guides 12A and 12B are provided on the original document support 11 to guide the side edges of the original document. The pair of edge guides 12A and 12B are configured to slide in the width direction (X-axis direction) of the original document. The pair of edge guides 12A and 12B are configured to be linked by a rack and pinion mechanism (not shown) in a manner that separates or approaches each other at a center position in the width direction of the original document. That is, the scanner 1 adopts a so-called center feed method.

[0123] In addition, such as Figure 26 As shown, pull-out portions 12c and 12d are respectively provided on the edge guides 12A and 12B. The pull-out portion 12c has a protrusion 12e, which protrudes outward (in the +X direction) when the pull-out portion 12c is housed in the edge guide 12A, allowing the user to pull outward by placing a finger on the protrusion 12e. Figure 26 (A) towards Figure 26 As shown in the change (B), the pull-out portion 12c is pulled downstream in the feed direction. Similarly, the pull-out portion 12d has a protrusion 12f, which protrudes outward (in the -X direction) when the pull-out portion 12d is housed in the edge guide 12B, and can be pulled outward by placing a finger on the protrusion 12f. Figure 26 (A) towards Figure 26 As shown in the change of (B), the pull-out section 12d is pulled downstream in the feed direction.

[0124] Thus, by providing pull-out portions 12c and 12d on the edge guides 12A and 12B respectively, which extend downstream in the feed direction, the area guiding the side edge of the original document can be extended downstream in the feed direction. As a result, the side edge of the original document can be guided in a wider area in the feed direction, and small original documents in the feed direction can also be guided appropriately, thus effectively suppressing skew during feeding.

[0125] Furthermore, when the pull-out portions 12c and 12d are pulled out from the edge guides 12A and 12B respectively, as Figure 1 When the upper opening / closing part 10 is closed, the pull-out parts 12c and 12d abut against the first frame 63 of the base constituting the first unit 3 (see reference). Figure 4 Therefore, they can be stored away. That is, there is no need for a special operation to store the pull-out parts 12c and 12d, which improves ease of use.

[0126] The feed roller 14 is located in the second unit 4. When the second unit 4 is closed relative to the first unit 3, the feed roller 14 contacts the separation roller 15, which will be described later. When the second unit 4 is opened relative to the first unit 3, the feed roller 14 moves away from the separation roller 15.

[0127] The feed roller 14 is powered and rotated by the conveyor motor 50, which will be described later. A separation roller 15 is provided in the first unit 3 opposite to the feed roller 14. The separation roller 15 is subjected to rotational torque by a torque limiter (not shown), which suppresses the stacking of original documents. Alternatively, a separation pad may be used instead of the separation roller 15.

[0128] The feed roller 14 and the separation roller 15 are positioned at the center of the original document width direction (see reference). Figure 4 ).

[0129] As an example of a separation section arranged opposite to the feed roller 14, the separation roller 15 can move forward and backward relative to the feed roller 14, and can pass through the torque limiter 98 (see reference). Figure 16 The separation switching unit 100, described later, generates a separation state with rotating torque and a non-separation state without the torque limiter 98, depending on the action of the torque limiter 98. Figure 14 , Figure 17 The separation switching unit 100 switches between a separation state where the separation roller 15 separates the original document and a non-separation state where the separation roller 15 does not separate the original document. In addition, the separation switching unit 100 sets the separation roller 15 to the separation state when the device body 2 is in the normal reading posture, and sets the separation roller 15 to the non-separation state when the device body 2 is in the booklet reading posture.

[0130] The separation switching unit 100 will be described in detail later.

[0131] A first conveyor roller pair 16 is provided downstream of the feed roller 14 and the separating roller 15. The first conveyor roller pair 16 consists of a first lower roller 17 provided in the first unit 3 and a first upper roller 18 provided in the second unit 4. The first upper roller 18 is configured to move forward and backward relative to the first lower roller 17 and is pressed toward the first lower roller 17 by a pressing member (not shown), such as a helical spring.

[0132] Both the first lower roller 17 and the first upper roller 18 are powered and rotated by the conveyor motor 50 described later. Two first lower rollers 17 and two first upper rollers 18 are respectively arranged such that they are positioned at the center of the original document's width direction (see reference). Figure 4 ).

[0133] When the second unit 4 is closed relative to the first unit 3, the first lower roller 17 and the first upper roller 18 are in contact. When the second unit 4 is opened relative to the first unit 3, the first upper roller 18 moves away from the first lower roller 17.

[0134] Downstream of the first conveyor roller pair 16, a first reading section 32 and a second reading section 33 are disposed opposite each other. The first reading section 32 is disposed in the first unit 3, and the second reading section 33 is disposed in the second unit 4. The first reading section 32 reads the lower surface (first surface) of the original supported by the original support section 11, and the second reading section 33 reads the upper surface (second surface) of the original supported by the original support section 11. The second reading section 33 is disposed in a manner that allows it to move forward and backward relative to the first reading section 32, and is pressed toward the first reading section 32 by a pressing member (not shown), such as a coil spring.

[0135] In this embodiment, the first reading unit 32 and the second reading unit 33 are composed of a contact-fit image sensor module (CISM). Reference numeral 32a is the contact glass constituting the first reading unit 32, and reference numeral 33a is the contact glass constituting the second reading unit 33.

[0136] A second conveying roller pair 20 is provided downstream of the first reading unit 32 and the second reading unit 33. The second conveying roller pair 20 consists of a second lower roller 21 provided in the first unit 3 and a second upper roller 22 provided in the second unit 4. The second upper roller 22 is configured to move forward and backward relative to the second lower roller 21 and is pressed toward the second lower roller 21 by a pressing member (not shown), such as a helical spring.

[0137] The second lower roller 21 and the second upper roller 22 are both powered by the conveyor motor 50 (described later) and rotate. Two of the second lower roller 21 and the second upper roller 22 are respectively arranged such that they are positioned at the center of the original document's width direction (see reference). Figure 4 ).

[0138] When the second unit 4 is closed relative to the first unit 3, the second lower roller 21 and the second upper roller 22 are in contact. When the second unit 4 is opened relative to the first unit 3, the second upper roller 22 moves away from the second lower roller 21.

[0139] exist Figure 5 , Figure 6 The single-dotted line represented by the symbol R1 is the original document feed path. The original document feed path R1 is defined as extending from the clamping position of the feed roller 14 and the separating roller 15 to the clamping position of the first conveying roller pair 16. Additionally, in Figure 5 , Figure 6 In the diagram, the dashed line represented by the symbol R2 is the reading transport path, which extends from the clamping position of the first transport roller pair 16 to the clamping position of the second transport roller pair 20. The reading transport path R2 is the original document transport path opposite to the first reading unit 32 and the second reading unit 33.

[0140] When the main body 2 of the device is in Figure 5 In the typical reading posture shown, a reversing conveyor path R3 is formed downstream of the reading conveyor path R2 to flip the read document upwards and discharge it. The reversing conveyor path R3 is the document conveying path downstream of the clamping position of the second conveyor roller pair 20, such as... Figure 5 The double-dotted line in the middle shows the manuscript transport path used to bend and flip the manuscript being transported diagonally downwards and discharged diagonally upwards from the first outlet 37.

[0141] When the main body 2 of the device is in Figure 6 In the illustrated booklet reading posture, a non-reversing conveyor path R4 is formed downstream of the reading conveyor path R2 to discharge the read document without causing it to flip. The non-reversing conveyor path R4 is the document conveyor path downstream of the clamping position of the second conveyor roller pair 20, such as... Figure 6 The double-dotted line in the middle indicates the manuscript transport path used to discharge the manuscript directly from the second outlet 38 downwards without bending or flipping it while it is being transported downwards in the reading transport path R2.

[0142] In addition, the second conveyor roller pair 20 functions as an exhaust roller pair for discharging the original from the non-reversible conveyor path R4.

[0143] The switching between the flip conveyor path R3 and the non-flip conveyor path R4 is performed by a baffle 35, which constitutes the conveyor path switching unit. The baffle 35 is rotatable about its rotation axis 35a. This rotation connects the flip conveyor path R3 to the reading conveyor path R2, or connects the non-flip conveyor path R4 to the reading conveyor path R2. Connecting the flip conveyor path R3 to the reading conveyor path R2 means that the flip conveyor path R3 can be used, and conversely, it means that the non-flip conveyor path R4 cannot be used. Similarly, connecting the non-flip conveyor path R4 to the reading conveyor path R2 means that the non-flip conveyor path R4 can be used, and conversely, it means that the flip conveyor path R3 cannot be used.

[0144] In this embodiment, the baffle 35 is configured to rotate in conjunction with the posture switching of the device body 2. As a structure that rotates the baffle 35 in conjunction with the posture switching of the device body 2, a first solenoid 86 (see reference 86) is used in this embodiment. Figure 12The control unit 80 performs various controls (see reference). Figure 12 The posture of the device body 2 is detected based on the detection signal from the first posture detection sensor 87 or the second posture detection sensor 88 (described later), and the first solenoid 86 is driven to rotate the baffle 35 based on the posture. Furthermore, the unit that rotates the baffle 35 is not limited to the first solenoid 86, but may also be other actuators such as a motor. Alternatively, the baffle 35 may be configured to rotate mechanically in conjunction with the posture of the device body 2.

[0145] A third pair of conveying rollers 24 and a fourth pair of conveying rollers 28 are provided in the flipping conveyor path R3.

[0146] The third conveying roller pair 24 consists of a third drive roller 25 disposed in the third unit 5 and a third driven roller 26 disposed in the second unit 4. The third driven roller 26 is arranged in a manner that allows it to move forward and backward relative to the third drive roller 25, and is pressed toward the third drive roller 25 by a pressing member (not shown), such as a helical spring. The third drive roller 25 is driven by a conveying motor 50. The third driven roller 26 is a driven rotating roller.

[0147] The fourth conveying roller pair 28 consists of a fourth drive roller 29 disposed in the third unit 5 and a fourth driven roller 30 disposed in the second unit 4. The fourth driven roller 30 is configured to move forward and backward relative to the fourth drive roller 29 and is pressed towards the fourth drive roller 29 by a pressing member (not shown), such as a helical spring. The fourth drive roller 29 is driven by a conveying motor 50. The fourth driven roller 30 is a driven rotating roller.

[0148] The third drive roller 25, the third driven roller 26, the fourth drive roller 29, and the fourth driven roller 30 are each arranged in pairs, with two rollers positioned at the center position along the width direction of the original document (see reference). Figure 3 ).

[0149] When the third unit 5 is closed relative to the second unit 4, the third drive roller 25 and the third driven roller 26 are in contact, and the fourth drive roller 29 and the fourth driven roller 30 are also in contact. When the third unit 5 is opened relative to the second unit 4, the third drive roller 25 separates from the third driven roller 26, and the fourth drive roller 29 separates from the fourth driven roller 30.

[0150] The original manuscript conveyed on the flipping conveyor path R3 is discharged obliquely upward, including the -Y direction component, by the fourth conveyor roller pair 28, and is supported in an inclined position by the upper surface 4a of the second unit 4.

[0151] Next, the structure used to rotate the device body 2 will be described. In this embodiment, the device body 2 is rotated by the posture switching motor 40 (see reference 80) under the control of the control unit 80. Figures 7-10The posture switching motor 40 rotates under the power of the external device 500 connected to the scanner 1, changing its posture. The control unit 80 controls the posture switching motor 40 based on input information from the external device 500 connected to the scanner 1.

[0152] Figure 7 The back cover 66, which will form the appearance of the back of the device, is shown (see reference). Figure 2 (The state after removal). Symbol 41 represents the rotation conversion unit that converts the rotation of the posture switching motor 40 into the rotation of the device body 2. The posture switching motor 40 and the rotation conversion unit 41 are located on the side of the device in the width direction near the -X direction. The side of the device in the width direction near the -X direction means that it is located in the -X direction compared to the center position of the device in the X-axis direction.

[0153] On the first frame 63, which forms the base of the first unit 3, two supported portions 63b are provided at an open interval in the X-axis direction. On the main body support 6, two main body rotation shafts 6c are provided at an open interval in the X-axis direction. The first frame 63, i.e., the device main body 2, can rotate about the main body rotation shaft 6c by passing through the supported portions 63b. The main body rotation shaft 6c is a rotation shaft that forms a center parallel to the X-axis direction.

[0154] An attitude switching motor 40 is disposed on a first frame 63. The first frame 63 is shaped along the reading and conveying path R2. The attitude switching motor 40 is disposed on the rear side of the first frame 63, which is positioned in an inclined posture.

[0155] exist Figure 8 In the rotary conversion unit 41, there are: a gear 47b, which is a gear that is rotatably arranged in the first unit 3 and rotates by the power of the posture switching motor 40; and a tooth 6b, which is a tooth fixed on the main body support 6 and meshes with the gear 47b.

[0156] The toothed portion 6b is a toothed portion formed in the vertical wall portion 6a around the main body rotation axis 6c. The vertical wall portion 6a is a component constituting the main body support portion 6.

[0157] More specifically, a worm gear 42 is mounted on the rotating shaft of the attitude switching motor 40, transmitting power from the worm gear 42 to the first gear 43. The first gear 43 is integrated with the second gear 45 via a shaft 44. The second gear 45 transmits power to the first compound gear 46, and the first compound gear 46 transmits power to the second compound gear 47. Gear 47b forms part of the second compound gear 47.

[0158] The structure of the attitude switching motor 40 and the aforementioned rotation conversion unit 41, except for the gear 6b, is located in the first unit 3, i.e., the device body 2. Therefore, when the gear 47b rotates under the power of the attitude switching motor 40, as from... Figure 9 Towards Figure 10 Changes or from Figure 10 Towards Figure 9 As shown in the diagram, the main body 2 of the device rotates and changes its posture.

[0159] Furthermore, in this embodiment, the structure of the posture switching motor 40 and the aforementioned rotation conversion unit 41, except for the tooth 6b, is disposed in the first unit 3, i.e., the device body 2, and the tooth 6b is disposed in the main body support 6. However, it is also possible to replace this by disposing of the structure of the posture switching motor 40 and the aforementioned rotation conversion unit 41, except for the tooth 6b, in the main body support 6 and disposing of the tooth 6b in the device body 2.

[0160] Furthermore, a first abutment portion 6e serving as a first rotation limiting unit and a second abutment portion 6f serving as a second rotation limiting unit are formed on the upright wall portion 6a. A boss 63a provided on the first frame 63 enters between the first abutment portion 6e and the second abutment portion 6f. The device body 2 from... Figure 10 The booklet reading posture shown is towards Figure 9 When the device body 2 rotates in the normal reading posture shown, the normal reading posture is predetermined by the engagement between the boss 63a and the first abutment portion 6e. Furthermore, when the device body 2 rotates from... Figure 9 The typical reading posture shown Figure 10 When the booklet reading posture shown is rotated, the booklet reading posture of the device body 2 is predetermined by the contact between the boss 63a and the second contact part 6f.

[0161] When the boss 63a abuts against the first abutting part 6e or when the boss 63a abuts against the second abutting part 6f, the drive current value of the posture switching motor 40 increases. Therefore, the control unit 80 (refer to...) Figure 12 The posture of the device body 2 can be detected based on the rotation direction of the posture switching motor 40 and the increase in the drive current value. However, in this embodiment, a first posture detection sensor 87 and a second posture detection sensor 88, which will be described later, are provided, and the control unit 80 can also detect the posture of the device body 2 based on the detection signals of these sensors.

[0162] Furthermore, the normal reading posture and book reading posture of the device body 2 are maintained by supplying power to the stop posture switching motor 40 and setting it to a holding state.

[0163] The first posture detection sensor 87 is an optical sensor, disposed on the first frame 63, i.e., the device body 2. When the device body 2 is in a normal reading posture, such as... Figure 8As shown, a protrusion 6d provided on the main body support 6 blocks the optical axis of the first posture detection sensor 87. When the main body 2 of the device rotates from this state toward the booklet to read the posture, the protrusion 6d disengages from the optical axis of the first posture detection sensor 87.

[0164] In addition, such as Figure 11 As shown, a second posture detection sensor 88 is disposed in the second unit 4. A detection part 35b is formed on the baffle 35. When the main body 2 of the device is in a normal reading posture, such as Figure 11 As shown in (a), the detected part 35b disengages from the optical axis of the second posture detection sensor 88. When the device body 2 rotates from this state toward the booklet to read the posture, as... Figure 11 As shown in (b), the optical axis of the second posture detection sensor 88 is blocked by the detection unit 35b.

[0165] In summary, the control unit 80 is able to detect the posture of the device body 2 based on the detection signal of the first posture detection sensor 87 and the detection signal of the second posture detection sensor 88.

[0166] Furthermore, in the above-described embodiment, the posture of the device body 2 is switched by the power of the posture switching motor 40, but it is also possible to use a structure in which the posture of the device body 2 is switched by the user applying force to the device body 2 instead, or in addition to that.

[0167] Figure 13 The diagram illustrates a structure that allows the user to switch the orientation of the device body 2. Reference numeral 6a-1 denotes the vertical wall portion provided on the body support portion 6. A first abutment portion 6e and a second abutment portion 6f are formed on the vertical wall portion 6a-1. The normal reading orientation of the device body 2 is predetermined by the engagement of a boss 63a with the first abutment portion 6e, and the booklet reading orientation of the device body 2 is predetermined by the engagement of the boss 63a with the second abutment portion 6f.

[0168] A protrusion 61 is provided in the upright wall portion 6a-1. A recess 62 is formed in the first frame 63, and the protrusion 61 enters the recess 62 to maintain the posture of the device body 2. Furthermore, Figure 13 This illustrates the typical reading posture, in Figure 13 In the middle, the protrusion 61 enters the hidden recess, maintaining the normal reading posture. The recess 62 (not shown) and the protrusion 61 constitute the posture holding unit 60 that holds the posture of the main body 2.

[0169] Furthermore, in a structure where the posture of the device body 2 is switched by user operation, it is preferable to provide a hand-holding part on the device body 2 to hold the user's hand.

[0170] Next, refer to Figure 12 The control system in scanner 1 will be described.

[0171] The control unit 80 performs various controls on the scanner 1, including original document feeding, transport, ejection control, and reading control. Signals from the operation unit 7 are input to the control unit 80.

[0172] The control unit 80 controls the conveyor motor 50 and the posture switching motor 40. In this embodiment, each motor is a DC motor.

[0173] Reading data from the first reading unit 32 and the second reading unit 33 is input to the control unit 80, and signals for controlling each reading unit are sent from the control unit 80 to each reading unit.

[0174] The control unit 80 also receives signals from the following detection units: the placement detection unit 92, the stacking detection unit 91, the first original document detection unit 93, the second original document detection unit 94, the first posture detection sensor 87, the second posture detection sensor 88, the first rotation detection unit 89, and the second rotation detection unit 90.

[0175] like Figure 7 As shown, the first rotation detection unit 89 is a detection unit provided at the end of the device body 2 in the -X direction. The control unit 80 detects the rotation amount of the conveyor motor 50 through the first rotation detection unit 89, thereby being able to grasp the rotation amount of each roller provided on the original document conveying path.

[0176] The first rotary detection unit 89 is a rotary encoder comprising a rotating circular plate 89a and a detection unit 89b.

[0177] In addition, such as Figure 8 As shown, the second rotation detection unit 90 is a rotary encoder, which includes a rotating circular plate 90a mounted on the rotating shaft 40a of the posture switching motor 40 and a detection unit 89b. The control unit 80 detects the rotation amount of the posture switching motor 40 through the second rotation detection unit 90, thereby being able to determine the rotation direction and rotation amount of the posture switching motor 40.

[0178] Return to Figure 12 The control unit 80 includes a CPU 81, a flash ROM 82, and a RAM 83. The CPU 81 performs various calculations based on the program stored in the flash ROM 82 to control the operation of the entire scanner 1. The flash ROM 82, as an example of a storage unit, is a non-volatile memory capable of being read and written. Various information is temporarily stored in the RAM 83, which is also an example of a storage unit.

[0179] The interface 84 provided by the control unit 80 is referenced. Figure 2 The first connection part 71 and the second connection part 72, as described above, constitute the interface. The control unit 80 transmits and receives data with the external device 500 via this interface 84.

[0180] Next, the other testing departments will be explained.

[0181] The placement detection unit 92 is a detection unit located upstream of the feed roller 14. The control unit 80 is able to detect whether there is an original document on the original document support 11 based on the signal sent from the placement detection unit 92.

[0182] The first original document inspection unit 93 is an inspection unit located between the feed roller 14 and the first conveying roller pair 16. The control unit 80 is capable of detecting the passage of the top or bottom end of the original document at the inspection position based on the signal sent from the first original document inspection unit 93.

[0183] The stacking detection unit 91 is a detection unit located between the feed roller 14 and the first conveying roller pair 16, and is configured to include an ultrasonic transmitter and an ultrasonic receiver arranged opposite each other across the original document feed path R1. The control unit 80 can detect the stacking of the original document based on the signal transmitted from the stacking detection unit 91.

[0184] The second original document detection unit 94 is a detection unit disposed between the first conveyor roller pair 16 and the first reading unit 32 and the second reading unit 33. The control unit 80 is able to detect the passage of the top or bottom end of the original document at the detection position based on the signal sent from the second original document detection unit 94.

[0185] Next, refer to Figure 25 Here is an example illustrating the processing performed by the control unit 80. Figure 25 This is a flowchart illustrating the processing of the control unit 80 during posture switching of the device body 2. Figure 25 In this process, when the control unit 80 receives a document reading instruction ("Yes" in step S101), the control unit 80 determines whether a posture switch of the device body 2 is required (step S102). Here, the document reading instruction is used as an example from the external device 500 (see...). Figure 12 ) Receiving. In the external device 500, the type of original to be read can be set. When the type of original to be read is a card-shaped original or a booklet-shaped original, the control unit 80 sets the posture of the device main body 2 to the booklet reading posture. When the type of original to be read is a sheet-shaped original, the posture of the device main body 2 is set to the normal reading posture.

[0186] In step S102, the type of original document acquired is compared with the current posture of the device body 2 to determine whether to switch the posture of the device body 2. If posture switching is not required ("No" in step S102), the original document is read without posture switching control (step S106). If posture switching is required ("Yes" in step S102), the control unit 80, based on the target posture (step S103), switches the posture of the device body 2 to the booklet reading posture if the target posture is a booklet reading posture (step S104), and switches the original document transport path to the non-flipping transport path R4 (step S105). Alternatively, steps S104 and S105 can be executed simultaneously. Then, the original document is read (step S106).

[0187] Additionally, based on the target posture (step S103), if the target posture is a normal reading posture, the control unit 80 switches the posture of the device body 2 to the normal reading posture (step S107) and switches the original document transport path to the flip transport path R3 (step S108). Alternatively, steps S107 and S108 can be executed simultaneously. Then, the original document is read (step S106).

[0188] Furthermore, it is preferable that when the device body 2 is in a normal reading posture, the detection information of the stacking detection unit 91 is set to valid, and when the device body 2 is in a booklet reading posture, the detection information of the stacking detection unit 91 is set to invalid.

[0189] As described above, the scanner 1 includes: a main support 6, placed on the mounting surface G of the device; and a device main body 2, supported on the main support 6. The device main body 2 includes: a read transport path R2, which is a document transport path for transporting originals and is opposite to the first read section 32 and the second read section 33 for reading originals; a flip transport path R3, which is a document transport path downstream of the read transport path R2, used to flip the read originals upwards and discharge them; and a non-flip transport path R4, which is a document transport path downstream of the read transport path R2, used to discharge the read originals without flipping them. Additionally, a baffle 35 is provided, which switches the document transport path connected to the read transport path R2 to either the flip transport path R3 or the non-flip transport path R4.

[0190] The main body 2 is mounted on the main support 6 in a manner that allows it to rotate relative to the main support 6, and can be rotated to a normal reading position. Figure 5 The booklet reading posture (where the angle between the reading transport path R2 and the mounting surface G is smaller than that of the normal reading posture) Figure 6The baffle 35 switches between the reading conveying path R2 and the flipping conveying path R3 when the main body 2 of the device is in the normal reading posture, and connects the reading conveying path R2 and the non-flipping conveying path R4 when the main body 2 of the device is in the booklet reading posture.

[0191] Scanner 1 can efficiently transport hard-to-twist originals using the non-flip transport path R4. Hard-to-twist originals include booklets and cards. Furthermore, baffle 35 connects the read transport path R2 to the flip transport path R3 when the device body 2 is in a normal reading position, and connects the read transport path R2 to the non-flip transport path R4 when the device body 2 is in a booklet reading position. Therefore, compared to ejecting the original using the non-flip transport path R4 when in a normal reading position, the ejection direction of the original can be set along the mounting surface G. As a result, larger originals can be ejected compared to ejecting the original using the non-flip transport path R4 when in a normal reading position.

[0192] In addition, by setting the device body 2 to the normal reading posture, the angle between the reading transport path R2 and the mounting surface G can be larger than the angle of the book reading posture, which can reduce the space occupied by the device body 2.

[0193] Alternatively, the posture switching of the device body 2 can also be configured to be performed via a button constituting the operation unit 7. For example, one of the buttons constituting the operation unit 7 is assigned to the posture switching button. If the user presses the posture switching button when the current posture is the normal reading posture, the control unit 80 executes steps S104 and S105. Alternatively, if the user presses the posture switching button when the current posture is the booklet reading posture, the control unit 80 controls the posture switching motor 40 to execute steps S107 and S108.

[0194] Furthermore, as described above, the posture switching of the device body 2 can also be achieved by the user applying force to the device body 2. In this case, when the control unit 80 detects that the posture of the device body 2 has been switched from the normal reading posture to the booklet reading posture, the control unit 80 executes steps S104 and S105. Alternatively, when the control unit 80 detects that the posture of the device body 2 has been switched from the booklet reading posture to the normal reading posture, the control unit 80 executes steps S107 and S108.

[0195] Next, the separation switching unit 100 for switching the separation state and non-separation state of the separation roller 15 will be described.

[0196] like Figure 7 , Figure 14As shown, the separation switching unit 100 is disposed in the -Y direction, i.e., on the back side of the first frame 63, relative to the first frame 63. Regardless of the orientation of the device body 2, the separation switching unit 100 does not protrude from the top of the first frame 63 in the +Z direction toward the -Y direction, and is housed in the area formed on the back side of the first frame 63.

[0197] The separation switching unit 100 is located between the separation roller 15 and the rotation conversion unit 41 in the X-axis direction. A portion of the separation switching unit 100 and a portion of the rotation conversion unit 41 are located at the same position in the Y-axis direction.

[0198] like Figure 16 As shown, the separating roller 15 is configured to rotate within the roller holder 97. Figure 15 As shown, a shaft portion 97a is integrally formed on the roller holder 97. The shaft portion 97a is a shaft whose center line is parallel to the X-axis direction. The shaft portion 97a is supported on a bearing portion 63g formed in the first frame 63. As a result, the roller holder 97 can swing about the shaft portion 97a, that is, the separating roller 15 can move forward and backward relative to the feed roller 14. In addition, the roller holder 97 is pressed by a pressing unit (not shown), such as a torsion spring, in the direction in which the separating roller 15 moves toward the feed roller 14.

[0199] like Figure 16 As shown, a torque limiter 98 is rotatably mounted on the roller holder 97. This torque limiter 98 is an example of a resistance application part that applies rotational resistance to the separating roller 15. The center line of the rotation axis of the torque limiter 98 is parallel to the X-axis direction. The separating roller 15 is positioned relative to the torque limiter 98, and when the rotation of the torque limiter 98 is restricted, the separating roller 15 receives rotational torque from the torque limiter 98. That is, it enters a separation state for separating the original document.

[0200] When the rotation of the torque limiter 98 is not restricted, the separating roller 15 rotates in conjunction with the torque limiter 98 and does not receive rotational torque from the torque limiter 98. That is, it becomes a non-separation state where the original is not separated.

[0201] The separation switching unit 100 in this embodiment switches the separation state and non-separation state of the separation roller 15 by switching the rotation state and the non-restricted rotation state of the torque limiter 98 in the limiting roller holder 97.

[0202] The torque limiter 98 has a shaft portion 98a, on which a first gear 99 is fixedly mounted. That is, the first gear 99 and the torque limiter 98 do not rotate relative to each other.

[0203] A shaft portion 97b is formed in the roller holder 97, and a second gear 107 is provided in the shaft portion 97b. The second gear 107 is rotatable relative to the shaft portion 97b. The second gear 107 meshes with the first gear 99.

[0204] like Figure 17 As shown, the separation switching unit 100 includes a connecting shaft 106. The connecting shaft 106 is a shaft whose center line is parallel to the X-axis direction, and is configured to rotate relative to a bearing portion (not shown) formed in the first frame 63. A third gear 108 is fixedly provided at the X-direction end of the connecting shaft 106. That is, the third gear 108 and the connecting shaft 106 do not rotate relative to each other.

[0205] The second gear 107 and the third gear 108 constitute the second mechanism 102.

[0206] A fourth gear 109 is fixedly installed at the end of the connecting shaft 106 in the -X direction. That is, the fourth gear 109 and the connecting shaft 106 do not rotate relative to each other.

[0207] A rotation limiting member 110 is provided on the lower side of the fourth gear 109. The rotation limiting member 110 is configured to rotate relative to the shaft portion 105b formed on the guide member 105. The guide member 105 is a member fixed relative to the first frame 63 by a fixing unit (not shown).

[0208] The rotation limiting member 110 has a tooth 110a. The tooth 110a switches its engagement with the fourth gear 109 by rotating the rotation limiting member 110. Figure 17 , Figure 18 ) and the state of leaving the fourth gear 109 ( Figure 19 , Figure 20 ).

[0209] A boss 110b protruding in the –X direction is formed on the rotation limiting member 110. The boss 110b is loosely inserted into a hole 103a formed on the connecting rod member 103.

[0210] The connecting rod member 103 is a rod-shaped member that is slidable relative to the guide member 105, and its lower end contacts the cam portion 6h formed in the main body support portion 6. The connecting rod member 103 is pressed toward the cam portion 6h by a compression coil spring 104, which is an example of a pressing member. Reference numeral 105a is a spring retaining portion formed in the guide member 105.

[0211] The linkage member 103 slides relative to the guide member 105, therefore, the rotation limiting member 110 rotates due to the sliding motion of the linkage member 103. In other words, the linear motion of the linkage member 103 is converted into the rotational motion of the rotation limiting member 110.

[0212] The fourth gear 109, the rotation limiting component 110, the guide component 105, the connecting rod component 103, the compression coil spring 104, and the cam part 6h constitute the first mechanism part 101.

[0213] When the main body 2 of the device is in the normal reading posture, such as Figure 17 and Figure 18 As shown, the teeth 110a of the rotation limiting member 110 mesh with the fourth gear 109. This restricts the rotation of the fourth gear 109, thereby restricting the rotation of the connecting shaft 106, the third gear 108, the second gear 107, and the first gear 99, and also restricting the rotation of the torque limiter 98. In other words, the separating roller 15 is in a separated state.

[0214] When the device body 2 switches its posture from this state to a book reading posture, the lower end of the linkage member 103 switches to a position that contacts the cam portion 6h. The cam portion 6h is formed such that the +Y direction is higher than the -Y direction. When the device body 2 switches its posture to a book reading posture, the lower end of the linkage member 103 moves relative to the cam portion 6h in the +Y direction (refer to...). Figure 20 As a result, the connecting rod member 103 slides upward, the rotation limiting member 110 rotates, and the teeth 110a disengage from the fourth gear 109. This allows rotation of the fourth gear 109, and consequently allows rotation of the connecting shaft 106, the third gear 108, the second gear 107, and the first gear 99, as well as rotation of the torque limiter 98. That is, the separating roller 15 is in the non-separated state.

[0215] When the main body 2 of the device is in the booklet reading posture and the separating roller 15 is in the non-separated state ( Figure 19 , Figure 20 When the device body 2 is switched to the normal reading posture, the lower end of the linkage member 103 moves in the -Y direction relative to the cam part 6h. As a result, the linkage member 103 slides downward, the rotation limiting member 110 rotates, and the teeth 110a mesh with the fourth gear 109. This restricts the rotation of the fourth gear 109, and consequently restricts the rotation of the connecting shaft 106, the third gear 108, the second gear 107, and the first gear 99, as well as the rotation of the torque limiter 98. That is, the separation roller 15 is in the separated state.

[0216] As described above, the main body 2 of the scanner 1 is mounted on the main support 6 in a manner that allows it to rotate relative to the main support 6. This rotation enables switching between a normal reading posture and a book reading posture where the angle between the transport path R2 and the mounting surface G is smaller than that of the normal reading posture. Furthermore, a separation switching unit 100 is provided, which can switch between a separation state where the separation roller 15 separates the original document and a non-separation state where the separation roller 15 does not separate the original document. The separation switching unit 100 sets the separation roller 15 to the separation state when the main body 2 is in the normal reading posture and sets the separation roller 15 to the non-separation state when the main body 2 is in the book reading posture.

[0217] Therefore, users do not need to perform special operations to switch the separation state and non-separation state of the separation roller 15, thus improving the ease of use of the device.

[0218] Furthermore, the scanner 1 includes a torque limiter 98 that applies rotational resistance to the separating roller 15. The separation switching unit 100 establishes a separated state by limiting the rotation of the torque limiter 98 and limiting the coordinated rotation of the separating roller 15 and the torque limiter 98. Conversely, by allowing the rotation of the torque limiter 98 and allowing the coordinated rotation of the separating roller 15 and the torque limiter 98, a non-separated state is established. Thus, the separated and non-separated states of the separating roller 15 can be easily switched.

[0219] Furthermore, the separation switching unit 100 is a component that engages with the cam portion 6h formed in the main body support portion 6. It includes a connecting rod member 103 that can slide within the device main body 2 and a compression coil spring 104 that presses the connecting rod member 103 toward the cam portion 6h. The cam portion 6h has a shape that allows the connecting rod member 103 to slide as the device main body 2 rotates. Moreover, by the sliding of the connecting rod member 103 as the device main body 2 rotates, the separation state, which limits the rotation of the torque limiter 98, and the non-separation state, which allows the rotation of the torque limiter 98, are switched.

[0220] Therefore, the separation switching unit 100 can be implemented with a simple structure.

[0221] Furthermore, the torque limiter 98 is provided with a first gear 99, and the separation switching unit 100 includes: a first mechanism 101, which includes a connecting rod member 103; a second mechanism 102, which is associated with the first gear 99; and a connecting shaft 106, which is a rotatable shaft extending along the rotation axis of the torque limiter 98, connecting the first mechanism 101 and the second mechanism 102. Thus, since the first mechanism 101 and the second mechanism 102 are connected by the connecting shaft 106, the first mechanism 101 and the second mechanism 102 can be separately configured, increasing the design freedom of the device.

[0222] Additionally, the second mechanism 102 includes: a second gear 107 that meshes with the first gear 99; and a third gear 108 that meshes with the second gear 107 and is disposed at one end of the connecting shaft 106. The first mechanism 101 includes: a fourth gear 109 disposed at the other end of the connecting shaft 106; and a rotation limiting member 110, which is a member having teeth 110a that can mesh with the fourth gear 109, engages with the connecting rod member 103, and rotates as the connecting rod member 103 slides, thereby allowing the teeth 110a to move forward and backward relative to the fourth gear 109.

[0223] Furthermore, the rotation of the torque limiter 98 is restricted by the engagement of the tooth 110a with the fourth gear 109, thus becoming a disengaged state; the rotation of the torque limiter 98 is allowed by the disengagement of the tooth 110a from the fourth gear 109, thus becoming a non-disengaged state.

[0224] Furthermore, the first frame 63 constituting the base of the device body 2 is shaped to extend along the reading and conveying path R2, and the separation switching unit 100 is disposed in the region formed on the lower side of the first frame 63. Therefore, by utilizing the region formed on the lower side of the first frame 63 to configure the separation switching unit 100, it is possible to suppress the enlargement of the device.

[0225] The separation switching unit 100 described above can also be modified as follows. Referring to the following... Figures 21-24 The separation switching unit 100 according to the second embodiment will be explained. Furthermore, in Figures 21-24 Structures identical to those already described will be marked with the same symbols; repeated descriptions will be avoided below.

[0226] The separation switching unit 100 has a first mechanism 101 and a second mechanism 102, which are connected by a connecting shaft 106.

[0227] The second mechanism 102 includes a rotation limiting member 113 and a rotary cam 112. The first mechanism 101 includes a first rotating member 115, a second rotating member 116, a guide member 105, a connecting rod member 103, a compression coil spring 104, and a cam 6h.

[0228] like Figure 21 and Figure 22 As shown, a rotation limiting member 113 is provided on the lower side of the first gear 99. The rotation limiting member 113 is configured to be displaced along the guide groove 63h formed in the first frame 63, and to move forward and backward relative to the first gear 99 by displacing along the guide groove 63h.

[0229] The rotation limiting member 113 has a tooth 113a. By displacing the rotation limiting member 113, the state in which the tooth 113a is engaged with the first gear 99 and the state in which the tooth 113a is disengaged from the first gear 99 can be switched.

[0230] When the tooth 113a meshes with the first gear 99, the rotation of the first gear 99 is restricted, and thus the separating roller 15 is in a separated state. Conversely, when the tooth 113a disengages from the first gear 99, the rotation of the first gear 99 is permitted, and thus the separating roller 15 is in a non-separated state.

[0231] An elongated hole 113b is formed on the rotation limiting member 113 along the displacement direction of the rotation limiting member 113, so that the connecting shaft 106 passes through the elongated hole 113b. Figure 22 As shown, a first cam follower 113c and a second cam follower 113d are formed on the surface of the rotation limiting member 113 in the +X direction, and the rotating cam 112 faces these cam followers.

[0232] The rotary cam 112 is fixed to one end of the connecting shaft 106. That is, the rotary cam 112 and the connecting shaft 106 do not rotate relative to each other. The rotary cam 112 has a first cam portion 112a and a second cam portion 112b that protrude radially.

[0233] A first rotating member 115 is fixedly disposed at the end of the connecting shaft 106 in the -X direction. That is, the first rotating member 115 and the connecting shaft 106 do not rotate relative to each other. A second rotating member 116 is rotatably disposed on the shaft portion 105b of the guide member 105. A boss 116b is formed on the second rotating member 116, and the boss 116b is loosely inserted into the hole 103a formed in the connecting rod member 103. Therefore, the second rotating member 116 rotates by the sliding action of the connecting rod member 103.

[0234] A tooth 116a is formed on the second rotating member 116, which meshes with a tooth 115a formed on the first rotating member 115.

[0235] With this structure, when the second rotating component 116 is rotated by sliding the connecting rod component 103, the first rotating component 115, the connecting shaft 106, and the rotating cam 112 rotate.

[0236] When the main body 2 of the device is in the normal reading posture, such as Figure 21 and Figure 22 As shown, the teeth 113a of the rotation limiting member 113 mesh with the first gear 99. This state is maintained by the first cam portion 112a of the rotating cam 112 pushing up the first cam follower 113c of the rotation limiting member 113.

[0237] As a result, the rotation of the torque limiter 98 is restricted, and the separating roller 15 is in a separated state.

[0238] When the device body 2 switches from this state to a booklet reading posture, similarly to the first embodiment described above, the connecting rod member 103 is pushed up by the cam portion 6h. As a result, the second rotating member 116, the first rotating member 115, the connecting shaft 106, and the rotating cam 112 are moved from the position... Figure 21 , Figure 22 The state shown is towards Figure 23 , Figure 24 The rotating state is shown. At this time, the rotation direction of the rotating cam 112 is... Figure 22 The middle direction is counterclockwise.

[0239] When rotating cam 112 from Figure 22 When the state rotates counterclockwise, such as from Figure 22 Towards Figure 24 As shown in the diagram, the second cam portion 112b pushes down the second cam follower 113d. This causes the rotation limiting member 113 to disengage from the first gear 99, i.e., disengages the gear portion 113a from the first gear 99, allowing the torque limiter 98 to rotate. In other words, the separating roller 15 is in the non-separated state.

[0240] When the device body 2 switches from a booklet reading posture and the separation roller 15 is in a non-separated state to a normal reading posture, the connecting rod component 103 slides downward, and the rotating cam 112 moves downward. Figure 24 The state rotates clockwise, thereby pushing up the rotation limiting member 113, and the toothed part 113a meshes with the first gear 99. As a result, the rotation of the torque limiter 98 is restricted, resulting in the separation state of the separating roller 15.

[0241] Thus, in the second embodiment, the second mechanism 102 includes: a rotation limiting member 113, which is a member having teeth 113a that mesh with the first gear 99 and is capable of moving forward and backward relative to the first gear 99; and a rotating cam 112, which is a rotating cam provided at one end of the connecting shaft 106 and switches between a state in which the rotation limiting member 113 moves towards the first gear 99 and a state in which the rotation limiting member 113 moves away from the first gear 99 by rotation. The first mechanism 101 has a structure that rotates the connecting shaft 106 by sliding along with the connecting rod member 103. In the first embodiment, the rotation limiting member 113 directly limits the rotation of the first gear 99, thus suppressing backlash in gear meshing. In addition, since there is no torsion of the connecting shaft 106, the separation state of the separating roller 15 can be appropriately formed.

[0242] Furthermore, in the above embodiments, an external device 500 (see reference 500) may also be used. Figure 12 If the scanner 1 has a display unit, the display unit can show whether the separation roller 15 is in a separated or non-separated state. At this time, it can also show whether the main body 2 is in a normal reading posture or a book reading posture.

[0243] Next, refer to Figure 27 The peripheral structures of the feed roller 14 and the separating roller 15 will be described in detail later, as well as with other figures as needed.

[0244] like Figure 27 As shown, a guide member 151, a placement guide member 153, a placement baffle 155, and a pressing rod 157 are provided around the separation roller 15. The placement guide member 153 is an example of a path forming member. In addition, the pressing rod 157 is an example of a pressing member.

[0245] A recess 63m is formed at the center of the feed direction of the first frame 63 and the X-axis direction (see reference). Figure 28 The recess 63m is provided with a separating roller 15, a guiding component 151, a placement guide 153, a placement baffle 155, and a pressing rod 157.

[0246] The guide member 151 is a frame-shaped component, configured such that a separation roller 15, a placement guide 153, a placement baffle 155, and a pressing rod 157 are arranged inside it. The guide member 151 is configured to be detachable from the first frame 63 by a snap-fit ​​mechanism (not shown), and forms part of the original document feed path when installed.

[0247] Placement guide 153, etc. Figure 31 As shown, there are rotation axes 153a on both sides in the X-axis direction. On the guide member 151, as... Figure 29 As shown, bearing portions 151a are formed on both sides in the X-axis direction, and the rotating shaft 153a that houses the guide 153 is axially supported by the bearing portions 151a so that it can rotate. Furthermore, in the recess 63m of the first frame 63, as... Figure 28 As shown, limiting portions 63j are formed on both sides in the X-axis direction. When the guide member 151 is installed on the first frame 63, the rotation axis 153a on which the guide member 153 is placed is restricted from moving in the feed direction by the limiting portions 63j.

[0248] First springs 161 are provided on both sides of the placement guide 153 in the X-axis direction. In this embodiment, the first springs 161 are torsion helical springs, generating a pressing force between the guide member 151 and the placement guide 153. The placement guide 153 is driven downstream in the feed direction towards the rotation direction of the feed roller 14 about the rotation axis 153a by the first springs 161. Figure 33 Press (clockwise).

[0249] like Figure 29 , Figure 31 As shown, fourth abutment portions 153j are formed on both sides of the guide member 153 in the X-axis direction. These fourth abutment portions 153j abut against the lower side of the guide member 151, thereby restricting the rotation of the guide member 153. Figure 33 (A clockwise rotation).

[0250] In addition, such as Figure 4 As shown, in the open state of the second unit 4 relative to the first unit 3, the fourth abutment portion 153j abuts against the lower side of the guide member 151. When the second unit 4 is closed relative to the first unit 3 from this state, the feed roller 14 abuts against the long ribs 153c and 153d of the guide member 153, thereby placing the guide member 153 in... Figure 33 The middle part rotates counterclockwise by a predetermined amount. In this state, the fourth abutment part 153j moves away from the underside of the guide member 151.

[0251] On the placement guide 153, a plurality of ribs extending along the original document feed direction are formed at predetermined intervals in the X-axis direction. The plurality of ribs consists of long ribs 153b, 153c, 153d, 153e and four short ribs 153f whose length in the original document feed direction is shorter than the length of these long ribs.

[0252] Two short ribs 153f are formed between long ribs 153b and 153c, and between long ribs 153d and 153e.

[0253] exist Figure 30 In this design, the straight line CL is a straight line passing through the center of the original document in the X-axis direction and parallel to the original document feed direction. Multiple ribs are configured to be linearly symmetrical with respect to the straight line CL. Specifically, long ribs 153b and 153e are configured to be linearly symmetrical with respect to the straight line CL, and long ribs 153c and 153d are configured to be linearly symmetrical with respect to the straight line CL. Additionally, two short ribs 153f located in the +X direction relative to the straight line CL and two short ribs 153f located in the -X direction relative to the straight line CL are configured to be linearly symmetrical with respect to the straight line CL.

[0254] Furthermore, the ribs do not necessarily have to be configured to be linearly symmetrical with respect to the straight line CL.

[0255] Long ribs 153c and 153d are formed in a manner that allows for the formation of torque limiter 98 (see reference). Figure 16 The outer periphery of the cylindrical portion 98b abuts at the position where the guide 153 is placed. Figure 33 When the ribs 153c and 153d rotate counterclockwise, they can come into contact with the cylindrical part 98b.

[0256] like Figure 31 As shown, two shaft portions 153h are formed in the placement guide 153, such as Figure 29 As shown, a pressing rod 157 is supported on the shaft portion 153h. Reference numeral 157a indicates the shaft fitting portion in which the pressing rod 157 engages with the shaft portion 153h. In this embodiment, the rotation center position of the pressing rod 157 coincides with the rotation center position of the guide member 153.

[0257] Alternatively, the rotation center position of the pressing rod 157 may be different from the rotation center position of the guide 153.

[0258] A second spring 162 is provided adjacent to the pressing lever 157. In this embodiment, the second spring 162 is a torsion coil spring, which generates a pressing force between the pressing lever 157 and the guide member 153. The pressing lever 157 is pressed downstream of the feed direction towards the rotational direction of the feed roller 14 about the shaft portion 153h (in the direction of rotation). Figure 33 (Clockwise) Press. That is, the pressing lever 157 is pressed by the second spring 162 toward the top part 157b toward the feed roller 14.

[0259] like Figure 33 As shown, a limiting part 153k is formed in the placement guide 153, and the rotation of the pressing rod 157 is limited by the pressing rod 157 abutting against the limiting part 153k. Figure 33 (The middle part represents a clockwise rotation).

[0260] In addition, such as Figure 4 As shown, in the open state of the second unit 4 relative to the first unit 3, the pressing lever 157 abuts against the limiting part 153k. When the second unit 4 is closed relative to the first unit 3 from this state, the feed roller 14 abuts against the pressing lever 157, thereby pressing the lever 157 in... Figure 33 The lever 157 rotates counterclockwise by a predetermined amount. By limiting the rotation limit of the pressing lever 157 when the second unit 4 is open using the limiting part 153k, the pressing lever 157 can be rotated appropriately when the second unit 4 is closed. In this state, as... Figure 33 As shown, the pressing lever 157 moves slightly away from the limiting part 153k.

[0261] In addition, such as Figure 28 , Figure 29, Figure 30 As shown, one of the two pressing levers 157 protrudes into the document feed path between the long rib 153c in the placement guide 153 and the short rib 153f located in the +X direction relative to the long rib 153c. The other of the two pressing levers 157 protrudes into the document feed path between the long rib 153d in the placement guide 153 and the short rib 153f located in the -X direction relative to the long rib 153d.

[0262] In addition, such as Figure 30 As shown, the two pressing levers 157 are positioned in a line-symmetrical manner with respect to the straight line CL. Furthermore, the two pressing levers 157 are capable of rotating independently. Additionally, the two pressing levers 157 are located within the region of the feed roller 14 in the X-axis direction, and are located at both ends of the feed roller 14.

[0263] Next, placement baffles 155 are respectively arranged between the long rib 153b of the placement guide 153 and the short rib 153f adjacent to the long rib 153b, and between the long rib 153e and the short rib 153f adjacent to the long rib 153e.

[0264] Two baffles, 155 as shown Figure 32 The base 155a, which is approximately axial in shape and extends along the X-axis, is shown to rotate integrally.

[0265] Shaft portions 155b are formed on both sides of the base 155a in the X-axis direction, and the shaft portions 155b are the rotation shafts for placing the baffle 155. Figure 28 As shown, the shaft portion 155b is supported by the bearing portion 63k formed in the recess 63m of the first frame 63, enabling it to rotate.

[0266] exist Figure 32 A cam follower 155c is formed in the +X direction relative to the shaft portion 155b. A baffle cam 163 is provided in the cam follower 155c in a manner that allows it to abut against the shaft. The baffle cam 163 is fixed to the -X direction end of the shaft 165, and a third gear 166 is provided at the +X direction end of the shaft 165 via a one-way clutch 167. A drive motor 50 (see reference) is transmitted to the third gear 166. Figure 12 Driven by the power of the conveyor motor 50, the third gear 166 rotates as the conveyor motor 50 rotates. The power of the conveyor motor 50 is transmitted to the shaft 165 via the third gear 166 and the one-way clutch 167.

[0267] A spring 164 is provided on the baffle cam 163. The spring 164 applies a pressing force to the spring engagement part (not shown) and the baffle cam 163, thereby exerting a pressing force in the direction of arrow Rc on the baffle cam 163, i.e., the shaft 165.

[0268] Figure 32 It shows Figure 33 The state is the feed standby state. In this state, the cam follower 155c abuts against the placement baffle cam 163, and the placement baffle 155 is as follows: Figure 33 The document is blocked in the feed path as shown. In this state, the top of the placed document abuts against the placement baffle 155, restricting its entry between the feed roller 14 and the separation roller 15.

[0269] Furthermore, in this state, the placement baffle cam 163, i.e., shaft 165, is restricted from rotating in the direction of arrow Rc by the action of the one-way clutch 167. Additionally, the third gear 166 stops due to the load on the power transmission path between it and the conveyor motor 50.

[0270] When the conveyor motor 50 rotates forward from this state and the third gear 166 rotates in the direction of arrow Ra, the shaft 165 rotates in the direction of arrow Rc due to the pressure of the spring 164, that is, the placement baffle cam 163 rotates in the direction of arrow Rc. As a result, the placement baffle cam 163 disengages from the cam follower 155c, and the placement baffle 155 rotates in the direction of arrow Rf, thus... Figure 33 As shown by symbol 155-1, the baffle 155 is placed to retract from the original document feed path. When the baffle 155 retracts from the original document feed path, the placed original document can be directed between the feed roller 14 and the separation roller 15.

[0271] Furthermore, due to the forward rotation of the conveyor motor 50, each roller positioned along the original document conveying path rotates in the direction that conveys the original document downstream. At this time, Figure 32 The third gear 166 continues to rotate in the direction of arrow Ra, but due to the action of the one-way clutch 167, the torque of the transmission motor 50 is not transmitted to the shaft 165.

[0272] When the conveyor motor 50 reverses while the baffle 155 is retracting from the original document feed path, Figure 32 In the middle, the third gear 166 rotates in the direction of arrow Rb. When the third gear 166 rotates in the direction of arrow Rb, it transmits torque in the direction of arrow Rd to the shaft 165 through the action of the one-way clutch 167. As a result, the shaft 165, i.e., the placement baffle cam 163, overcomes the pressing force of the spring 164 and rotates in the direction of arrow Rd, pushing up the cam follower 155c, and the placement baffle 155 rotates in the direction of arrow Re to return to the starting position. Figure 32 The state shown.

[0273] The above describes the structure around the separating roller 15. The following is a further explanation of the placement guide 153.

[0274] As mentioned above, Figure 33The diagram shows the feed standby state and the state without a document. Symbol T1 represents the contact position between the feed roller 14 and the separation roller 15, assuming the two rollers are not elastically deformed. Symbol T2 represents the contact position between the guide 153 and the feed roller 14, and symbol T3 represents the contact position between the top end 157b of the pressing rod 157 and the feed roller 14. As shown, contact position T2 is upstream in the feed direction compared to contact position T1, and contact position T3 is also upstream in the feed direction compared to contact position T2.

[0275] Furthermore, the symbol Sa is a path-forming surface formed by the upper surface of the first frame 63.

[0276] Figure 34 , Figure 35 To avoid complicating the diagram, the illustrations of placing the baffle 155 and pressing rod 157 have been omitted. Figure 34 (A) is with Figure 33 In the corresponding figure, in this feed standby state, a gap d is formed between the long ribs 153c and 153d of the placement guide 153 and the cylindrical portion 98b. In addition, the placement guide 153 advances relative to the feed roller 14, thus narrowing the original document feed path R1 toward the contact position T1.

[0277] When the thickness of the placed original exceeds the predetermined thickness, the placement guide 153 has no gap d, and as... Figure 34 As shown in (B), the cylindrical portion 98b, i.e., the separating roller 15, is pressed down by the long rib 153d. As a result, the separating roller 15 separates from the feed roller 14. This is the engagement of the guide 153 and the separating roller 15.

[0278] Figure 35 (A) describes a state in which multiple sheet-like original manuscripts Pt are placed, in which the long ribs 153c and 153d are separated from the cylindrical portion 98b and the separation roller 15 is not pressed down. As an example, when the thickness of the stack of original manuscripts composed of sheet-like original manuscripts Pt is less than 2 mm, the long ribs 153c and 153d do not contact the cylindrical portion 98b. Furthermore, in this state, the upper surface 153p of the placement guide 153 provides a preparatory separation effect on the top of the original manuscripts Pt. The upper surface 153p of the placement guide 153 is formed from the entire upper surface of the placement guide 153, including the aforementioned long ribs 153b, 153c, 153d, 153e, and short rib 153f.

[0279] Figure 35(B) is the state after the booklet-shaped original Pb has been placed and fed. During this process, the placement guide 153 is pressed down by the booklet-shaped original Pb, the long ribs 153c and 153d abut against the cylindrical portion 98b, the separation roller 15 is pressed down, and a gap is formed between the feed roller 14 and the separation roller 15. As an example, when the thickness of the booklet-shaped original Pb is 2 mm or more, the long ribs 153c and 153d contact the cylindrical portion 98b.

[0280] Furthermore, as the booklet-shaped original Pb is conveyed by the feed roller 14, the separation roller 15 is pressed down by the booklet-shaped original Pb. While the booklet-shaped original Pb is being conveyed by being held between the feed roller 14 and the separation roller 15, as... Figure 35 As shown in (B), preferably, the long ribs 153c and 153d exit from the cylindrical portion 98b. The separating roller 15 is not pressed down by the placement guide 153, so the separating roller 15 can stably hold the booklet-shaped original Pb between the separating roller 15 and the feed roller 14.

[0281] As described above, the scanner 1 or the original document feeding device 150 has a placement guide 153 upstream of the contact position T1 between the feed roller 14 and the separation roller 15 in the original document feeding direction. The placement guide 153 can move forward or backward relative to the feed roller 14 according to the thickness of the original document, and by moving forward relative to the feed roller 14, the original document feeding path R1 toward the contact position T1 is narrowed. The placement guide 153 can engage with the separation roller 15, and when the placement guide 153 is pressed in a direction away from the feed roller 14 due to an original document with a thickness exceeding a predetermined thickness, the separation roller 15 is displaced in a direction away from the feed roller 14.

[0282] In this way, when feeding an original with a thickness exceeding a predetermined thickness, the separation roller 15 moves away from the feed roller 14 before the original enters between the separation roller 15 and the feed roller 14, thus preventing the original with a thickness exceeding the predetermined thickness from hitting the separation roller 15 and being unable to be fed.

[0283] In addition, in such Figure 35 When multiple sheet-shaped original documents Pt are supported by the original document support 11 as shown in (A), the upper surface of the placement guide 153 provides a separation effect on the top of the original document Pt. Thus, separation using the placement guide 153 is performed before the original document Pt is separated by the feed roller 14 and the separation roller 15, thereby enabling more reliable separation of the original document Pt.

[0284] Additionally, as referenced Figures 28-30As explained, the placement guide 153 has multiple ribs (153b, 153c, 153d, 153e, 153f) extending along the original document feed direction. These ribs are arranged in a linearly symmetrical manner with respect to a straight line CL that passes through the center of the original document and is parallel to the original document feed direction, in the width direction (X-axis direction) that intersects the original document feed direction. Therefore, the frictional force exerted by the placement guide 153 on the original document is equal in the width direction with respect to the straight line CL, thereby suppressing the slant of the original document.

[0285] Furthermore, in the width direction, the straight line CL passes through the center position of the feed roller 14 and the center position of the separation roller 15. The long ribs 153c and 153d, which are two ribs close to the straight line, are positioned in the width direction, sandwiching the separation roller 15, and are located within the area of ​​the feed roller 14. Therefore, the original document feed path towards the contact position T1 can be appropriately narrowed, and the number of original documents towards the contact position T1 can be appropriately limited. As a result, the separation effect of the separation roller 15 can be appropriately achieved.

[0286] Furthermore, in this embodiment, the separation section, arranged opposite to the feed roller 14, is composed of a rotatable separation roller 15, and the placement guide 153 is configured to engage with the separation roller 15 by abutting against a cylindrical portion 98b centered on the rotation center of the separation roller 15. And, as shown in reference... Figure 34 As explained, when the thickness of the original document is less than or equal to a predetermined thickness, there is a gap d between the placement guide 153 and the cylindrical portion 98b. When the thickness of the original document exceeds the predetermined thickness, the placement guide 153 abuts against the cylindrical portion 98b, causing the separating roller 15 to shift away from the feed roller 14. As a result, the separating roller 15 can reliably leave the feed roller 14.

[0287] Furthermore, in this embodiment, the guide 153 is placed against the cylindrical portion 98b forming the outer periphery of the torque limiter 98, but it could also be placed against the rotating shaft of the separating roller 15. In either case, the guide 153 is placed against the separating roller 15 indirectly via other components, but it could also be placed against the separating roller 15 directly.

[0288] Alternatively, the above-described embodiments can be replaced by the following structure: Figure 36 As shown, the placement guide is engaged with the separation roller 15 by abutting against the third abutment portion 97c formed on the roller holder 97 that holds the separation roller 15. Figure 36 In the text, symbol 153 refers to a placement guide in other embodiments. In addition to having a guide portion 153m for guiding the original manuscript, the placement guide 153 also has a fifth contact portion 153n.

[0289] Figure 36 (A) is the feed standby state and the state in which no original is placed. In this state, a gap d is formed between the fifth abutment part 153n and the third abutment part 97c. Furthermore, the guide part 153m narrows the original feed path R1 toward the contact position T1.

[0290] The placement guide 153 is pressed down by the placed original, therefore, when the thickness of the original exceeds the predetermined thickness, the gap d disappears, and, as Figure 36 As shown in (B), the third abutment 97c is pressed down by the fifth abutment 153n, the roller holder 97 swings, and the separating roller 15 is pressed down. As a result, the separating roller 15 separates from the feed roller 14.

[0291] In this way, the third abutment portion 97c is formed on the roller holder 97, so the position of the third abutment portion 97c has a high degree of freedom, which can improve the design freedom.

[0292] Next, refer to Figure 37 The action of pressing lever 157 will be explained. Furthermore, in... Figure 37 The illustration of the baffle 155 is omitted.

[0293] exist Figure 37 In the diagram, symbol P1 represents the original being fed, symbol Pd represents the stack of originals below original P1, and symbol P2 represents the uppermost medium in the stack of originals Pd, which is the original being fed from original P1.

[0294] Figure 37 (A) shows the state of the original P1 during feeding, in which the feed roller 14 applies a downstream conveying force to the original P1 in the original feeding direction by rotating forward (arrow Rg direction). Simultaneously, the original stack Pd also moves downstream in the original feeding direction. Therefore, the original stack Pd overcomes the second spring 162 (see reference). Figure 29 The spring force of the spring presses down the pressing lever 157, so that the pressing lever 157 does not protrude upward from the placement guide 153.

[0295] Furthermore, in this state, the pressing lever 157 does not contact the cylindrical portion 98b, and the pressing lever 157 does not press down on the separating roller 15. This prevents the separating roller 15 from leaving the feed roller 14 at an inappropriate timing.

[0296] Next, if from Figure 37 When the rear end of the original P1 is in state (A) and the feed roller 14 contacts the separation roller 15 at position T1, the torque limiter 98, which applies a rotational load to the separation roller 15, will rebound, and the separation roller 15 will reverse (arrow Rj direction).

[0297] In this embodiment, no one-way clutch is provided on the feed roller 14, so the feed roller 14 will also reverse as the separation roller 15 reverses (arrow Rh direction).

[0298] Here, when the feed roller 14 can freely reverse, due to the reversal of the feed roller 14, the stack of originals Pd containing the original P2 will violently return upstream in the original feed direction, which may result in significant skew or no feed.

[0299] However, a pressing lever 157 is provided, which presses the stack of originals Pd toward the feed roller 14 by means of the top part 157b of the pressing lever 157 after the rear end of the fed original P1 has left the contact position T1. This suppresses the phenomenon of the stack of originals Pd violently returning upstream in the original feed direction, and can suppress paper feeding defects such as skewed movement and no feeding.

[0300] In particular, in this embodiment, since the original is fed from the uppermost layer of the original supported on the original support 11, the uppermost original P2, which is about to return upstream in the original feed direction due to the reverse rotation of the feed roller 14, is prone to skew and return upstream in the original feed direction. However, by the action of the aforementioned pressing rod 157, the phenomenon of the original P2 violently returning upstream in the original feed direction is suppressed, and paper feeding defects such as skew and non-feeding can be suppressed.

[0301] Furthermore, in this embodiment, the pressing lever 157 rotates around the shaft portion 153h, which serves as the axis of rotation, causing the top portion 157b to move forward and backward relative to the feed roller 14. The shaft portion 153h is located upstream of the top portion 157b in the original document feeding direction. Here, when the original document needs to return upstream in the original document feeding direction due to the reverse rotation of the feed roller 14, the pressing lever 157, which is in contact with the original document, is prone to... Figure 37 If the original is rotated clockwise, it is easy for the original to return upstream in the original feed direction. However, since the shaft portion 153h is located upstream of the top portion 157b in the original feed direction, the pressing rod 157, which is in contact with the original, is difficult to rotate, thus effectively suppressing the phenomenon of the original returning upstream due to the reverse rotation of the feed roller 14.

[0302] Furthermore, a limiting portion 153k is provided on the placement guide 153, which limits the rotational limit of the pressing rod 157 in the direction in which the tip portion 157b of the pressing rod 157 moves toward the feed roller 14. This allows for more reliable suppression of the pressing rod 157. Figure 37 The clockwise rotation of the feed roller 14 can effectively suppress the phenomenon of the original manuscript returning upstream due to the reverse rotation of the feed roller 14.

[0303] In addition, in this embodiment, as referred to Figure 30As explained, the pressing lever 157 is provided in the area of ​​the feed roller 14 in the X-axis direction, that is, in the width direction intersecting the original document feeding direction. As a result, the original document can be reliably pressed against the feed roller 14 by means of the pressing lever 157, and the phenomenon of the medium returning upstream due to the reverse rotation of the feed roller 14 can be more reliably suppressed.

[0304] Furthermore, in this embodiment, the pressing rod 157 is disposed at both ends in the width direction relative to one of the feed rollers 14. This suppresses the skewing of the original manuscript when it is about to return upstream due to the reverse rotation of the feed roller 14.

[0305] In addition, in such Figure 38 When multiple feed rollers 14 are provided in the X-axis direction, it is preferable that the pressing rod 157 is integrally disposed at both ends relative to the multiple feed rollers 14. This can suppress the deflection of the original when it is about to return upstream.

[0306] Alternatively, instead of setting multiple pressing levers 157, one can be set at the center position in the X-axis direction, for example.

[0307] Furthermore, in this embodiment, the multiple pressing levers 157 can move independently relative to the feed roller 14. If, for example, the multiple pressing levers 157 move in and out as a single unit, the pressing state of each lever 157 on the original document would differ, potentially causing the original document to slant. For instance, if one pressing lever 157 is in contact with the original document while another is not, slant occurs. However, in this embodiment, the multiple pressing levers 157 can move independently relative to the feed roller 14, thus each lever 157 appropriately presses the original document, suppressing the aforementioned slant.

[0308] In addition, in this embodiment, as referred to Figure 33 As explained, the contact position T3 where the pressing rod 157 abuts against the feed roller 14 is upstream compared to the contact position T2 where the placement guide 153 abuts against the feed roller 14. Therefore, when the original needs to return upstream due to the reversal of the feed roller 14, the original can be pressed firmly for a longer period of time, and the phenomenon of the original returning upstream due to the reversal of the feed roller 14 can be suppressed more reliably.

[0309] In addition, the pressing force of the second spring 162 on the pressing rod 157 is less than the pressing force of the first spring 161 on the placement guide 153. Therefore, when feeding the original, the pressing rod 157 can easily retract from the original feeding path, and the situation where the pressing rod 157 obstructs the feeding of the original can be suppressed.

[0310] In addition, the pressing part, which can press the original toward the feed roller 14, can also be used as... Figure 39 It is constructed as shown. In Figure 39 In this design, arm 171 is configured to slide relative to support 170 in the direction of arrow Sd, and a driven roller 172 is provided at the top of arm 171. Arm 171 is pressed in the direction of document advance by a spring (not shown), and by this pressing, driven roller 172 comes into contact with the document. This suppresses the phenomenon where the document stack Pd violently returns upstream in the document feed direction when feed roller 14 reverses (arrow Rh direction), and suppresses paper feeding defects such as skewed movement and no feed. Furthermore, the feed load applied to the fed document is suppressed by driven roller 172.

[0311] The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention as described in the claims, and these modifications are of course also included within the scope of the present invention.

[0312] Furthermore, while the above embodiments illustrate examples applicable to image reading devices such as scanners, they can also be applied to recording devices such as printers. That is, by using the original document as the recording medium and the reading unit as the recording unit that records the document, the same effects as in the above embodiments can be achieved in the recording device. As an example of a recording device, an inkjet printer can be cited; as an example of a recording unit, an inkjet recording head can be cited.

Claims

1. A media feed device, characterized by, Possessing: a medium support portion that supports a medium; a feed roller that contacts an upper surface of the medium supported by the medium support portion; a separation portion that is disposed opposite the feed roller and is capable of advancing and retreating relative to the feed roller; a path forming member that is a member located upstream of a contact position of the separation portion relative to the feed roller in a medium feed direction, the path forming member being capable of advancing and retreating relative to the feed roller according to the thickness of the medium, and narrowing the medium feed path toward the contact position by advancing relative to the feed roller; and a first pressing portion that presses the path forming member toward the feed roller, in the case where the thickness of the medium is equal to or less than a predetermined thickness, a gap exists between the path forming member and the separation portion without pressing down the separation portion, the path forming member is capable of engaging with the separation portion, and when pressed in a direction of retreating from the feed roller due to a medium whose thickness exceeds the predetermined thickness, the path forming member presses down the separation portion by contacting the separation portion, thereby displacing the separation portion in a direction away from the feed roller, and when the medium is transported with being clamped between the feed roller and the separation portion, the path forming member is separated from the separation portion.

2. The medium feed apparatus according to claim 1, wherein when a plurality of sheet-shaped media are supported by the medium support portion, an upper surface of the path forming member gives a separation action to the tip end of the media.

3. The medium feed apparatus according to claim 1, wherein the path forming member has a plurality of ribs extending in the medium feed direction, the plurality of ribs are disposed to be linearly symmetrical relative to a straight line passing through the center of the medium and parallel to the medium feed direction in a width direction that is a direction intersecting the medium feed direction.

4. The medium feed apparatus according to claim 3, wherein in the width direction, the straight line passes through the center position of the feed roller and the center position of the separation portion, two ribs of the plurality of ribs that are close to the straight line in the width direction are located on both sides of the separation portion in the width direction and within the region of the feed roller.

5. The medium feed apparatus according to claim 1, wherein the separation portion is composed of a separation roller that is rotatable, the path forming member engages with the separation portion by abutting against a cylindrical portion centered on the rotation center of the separation roller, in the case where the thickness of the medium is equal to or less than the predetermined thickness, a gap exists between the path forming member and the cylindrical portion, when the thickness of the medium exceeds the predetermined thickness, the path forming member abuts against the cylindrical portion to displace the separation roller in a direction away from the feed roller.

6. The medium feed apparatus according to claim 1, wherein the separation portion is composed of a separation roller that is rotatable, the path forming member engages with the separation portion by abutting against the rotation shaft of the separation roller, in the case where the thickness of the medium is equal to or less than the predetermined thickness, a gap exists between the path forming member and the rotation shaft, when the thickness of the medium exceeds the predetermined thickness, the path forming member abuts against the rotation shaft to displace the separation roller in a direction away from the feed roller. When the thickness of the medium exceeds the predetermined thickness, the path forming member comes into abutment with the rotation shaft to displace the separation roller in a direction away from the feed roller.

7. The medium feed apparatus according to claim 1, wherein the separation portion is held by a holding member that is capable of advancing and retreating relative to the feed roller, the path forming member is engaged with the separation portion by coming into abutment with a third abutment portion formed on the holding member, in the case where the thickness of the medium is equal to or less than the predetermined thickness, there is a gap between the path forming member and the third abutment portion, when the thickness of the medium exceeds the predetermined thickness, the path forming member comes into abutment with the third abutment portion to displace the separation portion in a direction away from the feed roller.

8. The media feed device of claim 5, wherein, Further provided are: a pressing portion that presses the pressing portion toward the feed roller. Further provided are:

9. The media feed device of claim 1, wherein, a pressing portion that presses the pressing portion toward the feed roller. Further provided are: a pressing portion that presses the pressing portion toward the feed roller.

10. The medium feed apparatus according to claim 9, wherein the pressing portion advances and retreats relative to the feed roller by rotating about a rotation shaft, the rotation shaft is located upstream of the tip portion in the medium feed direction.

11. The medium feed apparatus according to claim 10, wherein a limiting portion that limits the rotation limit of the pressing portion in the direction in which the tip portion advances toward the feed roller is further provided.

12. The medium feed apparatus according to any one of claims 9 to 11, wherein the pressing portion is provided in the region of the feed roller in a width direction that is a direction intersecting the medium feed direction.

13. The medium feed apparatus according to claim 12, wherein the pressing portion is provided at both ends in the width direction relative to the feed roller.

14. The medium feed apparatus according to claim 13, wherein a plurality of the pressing portions are independently capable of advancing and retreating relative to the feed roller.

15. The medium feed apparatus according to claim 9, wherein in a feed standby state, the path forming member and the pressing portion are in abutment with the feed roller, the position at which the pressing portion is in abutment with the feed roller is located upstream of the position at which the path forming member is in abutment with the feed roller in the medium feed direction.

16. The medium feed apparatus according to claim 9, wherein The second pressing portion presses the path forming member with a pressing force smaller than the pressing force with which the first pressing portion presses the path forming member.

17. The media feed device of claim 1, wherein, Further provided are: a main body support portion on which the device is placed; and a device main body supported by the main body support portion, the separation portion is composed of a rotatable separation roller, the device main body is rotatably attached to the main body support portion, and the device main body is switchable between a first posture and a second posture by rotation, the second posture being a posture in which an angle formed by the medium feed path and the placement surface is smaller than in the first posture, the device main body is provided with a separation switching unit that is capable of switching between a separation state in which the separation roller separates a medium and a non-separation state in which the separation roller does not separate a medium, the separation switching unit sets the separation roller to the separation state when the device main body is in the first posture and sets the separation roller to the non-separation state when the device main body is in the second posture.

18. An image reading apparatus characterized by comprising: Further provided are: the medium feed device according to any one of claims 1 to 16; and a reading portion that reads a medium fed by the medium feed device.

Images