Media transport device

Abstract

To provide a medium carrying device reduced in power necessary for developing a placing base.SOLUTION: A medium carrying device comprises: a body 2; a placing base 5 rotatably supported by the body 2 to move between a storage position and a development position via an intermediate position; an extended member 6 movably supported on the placing base 5 to move between a shortened position and an extended position; a lever 45 movably supported on the placing base 5 to move between a projection position and a pressing-in position; and a telescopic mechanism 46 in which the extended member 6 is arranged at the shortened position when the lever 45 is arranged at the projection position, and the extended member 6 is arranged at the extended position when the lever 45 is arranged at the pressing-in position. The lever 45, when the placing base 5 is arranged between the storage position and the intermediate position, is separated from a body side abutting part 47 fixed to the body 2, and when the placing base 5 is arranged between the development position and the intermediate position and when the placing base 5 moves toward the development position, comes into contact with the body side abutting part 47, and moves toward the pressing-in position.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The technology of this disclosure relates to a medium transport device. [Background technology]

[0002] There is known a media transport device that is provided with an extension member that holds the portion of the medium placed on the mounting table that protrudes from the mounting table (Patent Documents 1 to 3). Such a media transport device can prevent the medium from shifting or falling off the mounting table due to the weight of the protruding portion. Such a media transport device further extends the extension member in conjunction with the deployment of the mounting table, improving user operability. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-51361 A [Patent Document 2] JP 2002-240986 A [Patent Document 3] JP 2018-135173 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, such a media transport device has a problem in that when the extension member extends in mechanical conjunction with the deployment of the mounting table, the force required to deploy the mounting table increases.

[0005] The disclosed technology has been made in consideration of the above points, and has an object to provide a medium transport device that reduces the force required to deploy the mounting table. [Means for solving the problem]

[0006] A medium transport device according to one aspect of the present disclosure includes a main body in which a transport path is formed for transporting a medium, a mounting table on which the medium is placed and which is supported on the main body rotatably about a rotation axis so as to move between a storage position and an expanded position via an intermediate position, an extension member movably supported on the mounting table so as to move between a contracted position and an extended position, a lever movably supported on the mounting table so as to move between a protruding position and a pushing-in position, and a mechanism for converting the movement of the lever into the movement of the extension member so that the extension member is positioned at the contracted position when the lever is positioned at the protruding position, and the extension member is positioned at the extended position when the lever is positioned at the pushing-in position. The lever is separated from a contact portion fixed to the main body when the mounting table is positioned in a separation section between the storage position and the intermediate position, and contacts the contact portion and moves toward the pushing-in position when the mounting table moves toward the expanded position when the mounting table is positioned in a contact section between the expanded position and the intermediate position. On a vertical plane that includes the rotation axis and is perpendicular to the installation plane along which the installation surface on which the main body is placed is located, on the opposite side to one side from a first point at which the center of gravity of the mounting table and the extension member is located when the mounting table is located in the stored position, a second point at which the center of gravity of the mounting table and the extension member is located when the mounting table is located in the deployed position, and a third point at which the center of gravity of the mounting table and the extension member is located when the mounting table is located in the intermediate position are located, and the distance from the third point to the installation plane is greater than the distance from the second point to the installation plane. Effect of the Invention

[0007] The disclosed media transport device can reduce the force required to deploy the mounting platform. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an image reading device provided with a medium conveying device according to a first embodiment. [Diagram 2] FIG. 2 is a side cross-sectional view showing the image reading device. [Diagram 3] FIG. 3 is a perspective view showing the mounting table. [Figure 4] FIG. 4 is a plan view showing the mounting table and the extension member. [Diagram 5] FIG. 5 is a side cross-sectional view showing the lever and the main body side contact portion when the mounting table is placed at the deployed position. [Figure 6] FIG. 6 is a plan view showing the lever and the extension mechanism when the extension member is in the retracted position. [Figure 7] FIG. 7 is a perspective view showing the image reading device when the mounting table is located at the storage position. [Figure 8] FIG. 8 is a side view showing the image reading device when the mounting table is located at the storage position. [Figure 9] FIG. 9 is a perspective view showing the image reading device with the cover removed. [Figure 10] FIG. 10 is a side cross-sectional view showing the image reading device when the cover is placed in the closed position. [Figure 11] FIG. 11 is a side view showing the image reading device when the mounting table is located at the midway position. [Figure 12] FIG. 12 is a side cross-sectional view showing the lever and the main body side contact portion when the mounting table is located at the midway position. [Figure 13] FIG. 13 is a side cross-sectional view showing the image reading device when the mounting table is placed in the separated section. [Figure 14] FIG. 14 is a perspective view showing an image reading device of a comparative example. [Figure 15] FIG. 15 is a plan view illustrating the expansion and contraction mechanism of the medium transport device according to the second embodiment. [Figure 16] FIG. 16 is an enlarged plan view showing the expansion and contraction mechanism of the medium transport device according to the second embodiment. [Figure 17] FIG. 17 is a plan view showing the extension mechanism of the medium conveying device of the second embodiment when the lever is located at the protruding position. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a medium conveying device according to an embodiment disclosed in the present application will be described with reference to the drawings. Note that the following description does not limit the technology of the present disclosure. In addition, in the following description, the same components are given the same reference numerals, and duplicated descriptions are omitted. EXAMPLES

[0010] The medium conveying device of the first embodiment is provided in an image reading device 1 as shown in Fig. 1. Fig. 1 is a perspective view showing the image reading device 1 provided with the medium conveying device of the first embodiment. The image reading device 1 includes a main body 2, a scan button 3, a mounting table 5, and an extension member 6. The main body 2 is formed in a roughly box shape. The scan button 3 is disposed on the upper side of the main body 2. The scan button 3 detects whether or not it has been pressed by a user of the image reading device 1.

[0011] The mounting base 5 is supported by the main body 2 so as to be rotatable about the rotation axis 8 so as to be placed in the deployed position or the stored position. FIG. 2 is a side cross-sectional view showing the image reading device 1. The main body 2 is placed on an installation surface 10 on which the image reading device 1 is installed. The rotation axis 8 is parallel to the plane along which the installation surface 10 is aligned. The mounting base 5 is formed with a main body mounting surface 11. The plane along which the main body mounting surface 11 is aligned is parallel to the rotation axis 8. The main body mounting surface 11 faces diagonally upward when the mounting base 5 is placed in the deployed position. The extension member 6 is formed in a generally plate-like shape. The extension member mounting surface 12 is formed on the extension member 6. The extension member 6 is placed so that the extension member mounting surface 12 is aligned with the plane along which the main body mounting surface 11 is aligned, and is supported by the mounting base 5 so as to be movable.

[0012] The center of gravity 14 of the mounting table 5 and the extension member 6 is located behind the vertical plane 15 when the mounting table 5 is in the expanded position. The vertical plane 15 overlaps with the rotation axis 8 and is perpendicular to the plane along which the installation surface 10 is aligned. Therefore, when the installation surface 10 is aligned along a horizontal plane and the mounting table 5 is in the expanded position, gravity is applied to the mounting table 5 and the extension member 6 so that they rotate clockwise in FIG. 2 around the rotation axis 8.

[0013] The image reading device 1 further includes a cover 16. The cover 16 is formed in a generally plate-like shape. The cover 16 is supported by the main body 2 so as to be rotatable about a rotation shaft 17. The rotation shaft 17 is parallel to the rotation shaft 8. The image reading device 1 further includes a cover opening / closing mechanism (not shown). When the mounting base 5 moves from the storage position to the deployment position, the cover opening / closing mechanism moves the cover 16 toward the open position and places the cover 16 in the open position. When the mounting base 5 is placed in the storage position, the cover opening / closing mechanism moves the cover 16 toward the closed position and places the cover 16 in the closed position.

[0014] The main body 2 is further formed with an insertion opening 21, a discharge opening 7, and a transport path 22. The insertion opening 21 is formed on the rear side of the main body 2. The discharge opening 7 is formed on the upper side of the front side of the main body 2. The transport path 22 is formed inside the main body 2. The insertion opening 21 and the discharge opening 7 are connected via the transport path 22.

[0015] The image reading device 1 further includes a transport unit 23 and a reading unit 24. The transport unit 23 is disposed inside the main body 2. The transport unit 23 supplies one medium of the multiple media inserted into the insertion opening 21 to the transport path 22, transports the one medium disposed on the transport path 22 along the transport path 22 toward the discharge opening 7, and discharges the medium transported along the transport path 22 from the discharge opening 7. The reading unit 24 captures an image of the medium transported along the transport path 22.

[0016] FIG. 3 is a perspective view showing the mounting table 5. The mounting table 5 includes a mounting table main body 31, a right support portion 32, a left support portion 33, a right hinge pin 34, and a left hinge pin 35. The mounting table main body 31 is formed in a plate shape. The mounting table main body 31 is formed with a main body mounting surface 11. The right support portion 32 is formed in a plate shape. The right support portion 32 is disposed so as to protrude from the right end of the mounting table main body 31 in the direction in which the main body mounting surface 11 faces, and so as to be along a plane perpendicular to the rotation axis 8, and is fixed to the mounting table main body 31. The left support portion 33 is formed in a plate shape. The left support portion 33 is disposed so as to protrude from the left end of the mounting table main body 31 in the direction in which the main body mounting surface 11 faces, and so as to be along a plane perpendicular to the rotation axis 8, and is fixed to the mounting table main body 31.

[0017] The right hinge pin 34 is formed in a rod shape. The right hinge pin 34 is arranged along the rotation axis 8 so as to protrude to the right from the right support part 32, and is fixed to the right support part 32, that is, is fixed to the mounting table main body 31 via the right support part 32. The left hinge pin 35 is formed in a rod shape. The left hinge pin 35 is arranged along the rotation axis 8 so as to protrude to the left from the left support part 33, and is fixed to the left support part 33, that is, is fixed to the mounting table main body 31 via the left support part 33. The mounting table 5 is formed so that the plane along which the main body mounting surface 11 is aligned does not overlap with the rotation axis 8. The main body 2 is formed with two hinge fitting holes (not shown). The mounting table 5 is supported by the main body 2 so as to be rotatable about the rotation axis 8 by fitting the right hinge pin 34 and the left hinge pin 35 into the two hinge fitting holes, respectively.

[0018] The right hinge pin 34 and the left hinge pin 35 can approach each other by the elastic deformation of the right support part 32 and the left support part 33. The right hinge pin 34 and the left hinge pin 35 can be removed from the two hinge fitting holes by approaching each other. When the right hinge pin 34 and the left hinge pin 35 are close to each other, they are disposed at a predetermined position, and the elastic deformation of the right support part 32 and the left support part 33 returns to their original state, so that the right hinge pin 34 and the left hinge pin 35 can be fitted into the two hinge fitting holes, respectively. That is, the image reading device 1 can facilitate the work of attaching the mounting table 5 to the main body 2 and removing the mounting table 5 from the main body 2 by forming the mounting table 5 in this way.

[0019] 4 is a plan view showing the mounting table 5 and the extension member 6. The extension member 6 is supported by the mounting table main body 31 of the mounting table 5 so as to be rotatable about a rotation axis 40 so as to be disposed in an extended position or a retracted position. The rotation axis 40 is perpendicular to the plane along which the main body mounting surface 11 is aligned, that is, perpendicular to the plane along which the extension member mounting surface 12 of the extension member 6 is aligned. When the extension member 6 is disposed in the extended position, the extension member 6 protrudes toward the tip side from the tip end 39 of the mounting table main body 31 of the mounting table 5.

[0020] The image reading device 1 further includes a lever 45, an extension mechanism 46, and a main body side abutment portion 47. The lever 45 is formed in a rod shape. The lever 45 is supported by the mounting table main body 31 so as to be rotatable about a rotation shaft 48 so as to be disposed at a pushed-in position or a protruding position. The rotation shaft 48 is parallel to the rotation shaft 40. When the lever 45 is disposed at the pushed-in position, the lever 45 is disposed inside the mounting table main body 31 without protruding from an end 49 on the base side of the mounting table main body 31 of the mounting table 5.

[0021] The extension mechanism 46 includes a spring 51, a lever side link 52, and an extension member side link 53. The spring 51 is formed of a torsion coil spring. One end of the spring 51 is fixed to the mounting table main body 31, and the other end of the spring 51 is fixed to the lever 45. When the lever 45 is disposed at the pressed-in position, the spring 51 elastically deforms and applies an elastic force to the lever 45 so that the lever 45 moves toward the extended position.

[0022] The lever side link 52 is formed in a rod shape. The lever side link 52 is supported by the mounting table main body 31 so as to be rotatable around the rotation shaft 48, and is fixed to the lever 45. An engagement hole 54 is formed in the other end of the lever side link 52 opposite to the one end connected to the lever 45. The extension member side link 53 is formed in a rod shape. A pin 55 is formed in one end of the extension member side link 53. The extension member side link 53 is supported by the lever side link 52 so as to be rotatable around a rotation shaft 56 by fitting the pin 55 into the engagement hole 54. The rotation shaft 56 is parallel to the rotation shaft 40. The extension member side link 53 is further supported by the extension member 6 so as to be rotatable around a rotation shaft 57. The rotation shaft 57 is parallel to the rotation shaft 40.

[0023] The telescopic mechanism 46 is thus formed to convert the movement of the lever 45 into the movement of the extension member 6 so that the extension member 6 is disposed at another position corresponding to the position at which the lever 45 is disposed. For example, the telescopic mechanism 46 is formed so that the extension member 6 is disposed at the extended position when the lever 45 is disposed at the pressed position. The telescopic mechanism 46 is formed so that the extension member 6 is disposed at the contracted position when the lever 45 is disposed at the extended position.

[0024] The center of gravity 41 of the extension member 6 is located to the left of the vertical plane 42 when the extension member 6 is located in the extended position. The vertical plane 42 overlaps with the rotation axis 40 and is perpendicular to the plane along which the installation surface 10 is located. Therefore, when the installation surface 10 is along a horizontal plane and the extension member 6 is located in the extended position, a component force 44 of gravity 43 is applied to the extension member 6 so that the extension member 6 rotates counterclockwise in FIG. 4 around the rotation axis 40 against the frictional force applied to the telescopic mechanism 46. The extension member 6 moves toward the retracted position by rotating counterclockwise in FIG. 4 around the rotation axis 40.

[0025] The main body side abutment portion 47 is fixed to the main body 2. When the mounting base 5 is arranged at the deployed position, the main body side abutment portion 47 is closest to the end 49 of the mounting base main body 31 of the mounting base 5 as shown in FIG. 5. FIG. 5 is a side cross-sectional view showing the lever 45 and the main body side abutment portion 47 when the mounting base 5 is arranged at the deployed position. When the mounting base 5 is arranged at the deployed position, the lever 45 comes into contact with the main body side abutment portion 47 and is pushed into the main body side abutment portion 47, so that the lever 45 is arranged at the pushed-in position. The gravity of the mounting base 5 and the extension member 6 is applied to the mounting base 5 so that the mounting base 5 moves toward the deployed position. The elastic force of the spring 51 is small enough that the mounting base 5 does not move toward the storage position via the lever 45 when the mounting base 5 is arranged at the deployed position.

[0026] 6 is a plan view showing the lever 45 and the extension mechanism 46 when the extension member 6 is in the retracted position. When the extension member 6 is in the retracted position, the extension member 6 is disposed inside the mounting table main body 31 without protruding from the tip end 39 of the mounting table main body 31. When the extension member 6 is in the retracted position, the center of gravity 41 of the extension member 6 is disposed on the left side of the vertical plane 42.

[0027] When the extension member 6 is in the retracted position, the lever 45 is placed in the protruding position by the telescopic mechanism 46. When the lever 45 is in the protruding position, it protrudes from an end 49 of the mounting table main body 31 of the mounting table 5 toward the base side. When the lever 45 is in the protruding position, the spring 51 elastically deforms and applies an elastic force to the lever 45 so as to counter the force that moves the lever 45 toward the pressed-in position.

[0028] FIG. 7 is a perspective view showing the image reading device 1 when the mounting table 5 is disposed at the storage position. The mounting table 5 can be appropriately disposed at the storage position when the extension member 6 is disposed at the contracted position. When the mounting table 5 is disposed at the storage position, the mounting table 5 is disposed on the upper side of the main body 2 and is stored in the main body 2. When the mounting table 5 is disposed at the storage position, the center of gravity 14 of the mounting table 5 and the extension member 6 is disposed on the near side of the vertical plane 15 when the mounting table 5 is disposed at the storage position. Therefore, when the installation surface 10 is along a horizontal plane, the gravity of the mounting table 5 and the extension member 6 is applied to the mounting table 5 so that the mounting table 5 rotates counterclockwise in FIG. 7 around the rotation axis 8 when the mounting table 5 is disposed at the storage position.

[0029] When the mounting table 5 is in the storage position, the cover 16 is in the closed position as shown in Fig. 8. Fig. 8 is a side view showing the image reading device 1 when the mounting table 5 is in the storage position. That is, when the mounting table 5 is in the storage position, the cover opening / closing mechanism moves the cover 16 toward the closed position and places the cover 16 in the closed position. When the cover 16 is in the closed position, it is located at the rear of the main body 2 and is stored in the main body 2.

[0030] 9 is a perspective view showing the image reading device 1 with the cover 16 removed. A rear opening 58 is formed at the rear side of the main body 2. The insertion port 21, the lever 45, and the main body side abutment portion 47 are exposed to the outside through the rear opening 58 when the mounting base 5 is placed in the storage position and the cover 16 is removed.

[0031] 10 is a side cross-sectional view showing the image reading device 1 when the cover 16 is in the closed position. When the cover 16 is in the closed position, the cover 16 closes the rear opening 58. The insertion opening 21, the lever 45, and the main body side abutment portion 47 are covered by the cover 16 when the rear opening 58 is closed by the cover 16. By covering the insertion opening 21, the lever 45, and the main body side abutment portion 47 with the cover 16, the image reading device 1 can prevent foreign matter from entering the insertion opening 21 and the transport path 22 and can prevent foreign matter from adhering to the lever 45 and the main body side abutment portion 47.

[0032] The mounting table 5 is disposed at an intermediate position as shown in FIG. 11 while moving from the deployed position to the stored position, or while moving from the stored position to the deployed position. FIG. 11 is a side view showing the image reading device 1 when the mounting table 5 is disposed at the intermediate position. The center of gravity 14 of the mounting table 5 and the extension member 6 is disposed at the back side of the vertical plane 15 when the mounting table 5 is disposed at the intermediate position. The height of the center of gravity 14 when disposed at the intermediate position is higher than the height of the center of gravity 14 when disposed at the deployed position. The height of a certain point is equal to the length of a perpendicular line drawn from the point to the plane along which the installation surface 10 is aligned. Therefore, when the installation surface 10 is aligned along a horizontal plane, the gravity of the mounting table 5 and the extension member 6 is applied to the mounting table 5 when the mounting table 5 is disposed at the intermediate position so that the mounting table 5 moves toward the deployed position, that is, the mounting table 5 rotates clockwise in FIG. 11.

[0033] 12 is a side cross-sectional view showing the lever 45 and the main body side contact portion 47 when the mounting table 5 is located at the intermediate position. The main body side contact portion 47 is separated from the end 49 of the mounting table main body 31 of the mounting table 5 when the mounting table 5 is located at the intermediate position. The lever 45 is located at the protruding position and protrudes from the end 49 of the mounting table main body 31 toward the base side when the mounting table 5 is located at the intermediate position. The lever 45 is also in contact with the main body side contact portion 47 when the mounting table 5 is located at the intermediate position.

[0034] When the mounting table 5 is located in the separation section between the stored position and the intermediate position, the lever 45 is located in the protruding position as shown in Fig. 13, and protrudes from an end 49 of the mounting table main body 31 toward the base side. Fig. 13 is a side cross-sectional view showing the image reading device 1 when the mounting table 5 is located in the separation section. When the mounting table 5 is located in the separation section, the lever 45 is further away from the main body side abutment portion 47.

[0035] [Operation of image reading device 1] When a user wishes to read images of a plurality of media using the image reading device 1, the user rotates the table 5 toward the deployed position when the table 5 is in the storage position, and places the table 5 in the deployed position. The cover 16 is placed in the closed position when the table 5 is in the storage position. The extension member 6 is placed in the contracted position when the table 5 is in the storage position. The lever 45 is placed in the protruding position by the telescopic mechanism 46 when the extension member 6 is in the contracted position. The lever 45 is further fixed to the table 5 in the protruding position by the elastic force of the spring 51. When the table 5 is in the storage position, the gravity of the table 5 and the extension member 6 is applied to the table 5 so as to counter the force that moves the table 5 toward the deployed position.

[0036] When the mounting base 5 moves from the storage position to the deployment position, the cover 16 is moved toward the open position by the cover opening / closing mechanism and disposed at the open position. When the mounting base 5 moves from the storage position to the deployment position, it passes through an intermediate position. When the mounting base 5 is disposed in the separation section between the storage position and the intermediate position, the lever 45 is fixed to the mounting base 5 by the spring 51 in a state in which it is disposed at the protruding position without contacting the main body side abutment portion 47. Since the lever 45 is fixed at the protruding position, the extension member 6 is fixed to the mounting base 5 in a state in which it is disposed at the contracted position. The force that rotates the mounting base 5 toward the intermediate position in the separation section is relatively small because the rotation of the mounting base 5 is not converted into the rotation of the extension member 6, and therefore only counters the gravity of the mounting base 5 and the extension member 6.

[0037] The lever 45 comes into contact with the main body side abutment portion 47 when the mounting base 5 is disposed in the contact section between the intermediate position and the deployed position. An end 49 of the mounting base main body 31 of the mounting base 5 approaches the main body side abutment portion 47 as the mounting base 5 moves toward the deployed position. When the mounting base 5 is disposed in the contact section, the lever 45 is pushed into the main body side abutment portion 47 as the mounting base 5 moves toward the deployed position, and moves toward the pushed-in position. When the lever 45 moves toward the pushed-in position, the extension member 6 moves toward the extended position by the telescopic mechanism 46.

[0038] That is, the movement of the mounting table 5 toward the deployed position in the contact section is converted into the movement of the extension member 6 toward the extended position by the lever 45, the telescopic mechanism 46, and the main body side abutment portion 47. Therefore, the force that moves the mounting table 5 toward the deployed position in the contact section includes a force that moves the extension member 6 toward the extended position. When the mounting table 5 is disposed in the contact section, the gravity of the mounting table 5 and the extension member 6 is applied to the mounting table 5 so that the mounting table 5 moves toward the deployed position. The force required to move the mounting table 5 toward the deployed position in the contact section is reduced by the gravity of the mounting table 5 and the extension member 6 being applied to the mounting table 5.

[0039] When the mounting table 5 is in the deployed position, the lever 45 is pushed into the main body side abutment portion 47, and is thereby placed in the retracted position. When the lever 45 is in the retracted position, the extension member 6 is placed in the extended position by the telescopic mechanism 46.

[0040] When the mounting base 5 is in the deployed position and the extension member 6 is in the extended position, the user places the plurality of media to be read on the mounting base 5. At this time, the image reading device 1 places the portions of the plurality of media protruding from the mounting base 5 on the extension member 6, thereby preventing the plurality of media from shifting or falling due to the weight of the protruding portions. When the plurality of media are placed on the mounting base 5, the main body mounting surface 11 faces diagonally upward, so that the plurality of media move by gravity toward the insertion slot 21 and are inserted into the insertion slot 21. After the plurality of media are inserted into the insertion slot 21, the user presses the scan button 3 to start the image reading device 1.

[0041] After the image reading device 1 is started, the transport unit 23 supplies each of the multiple media inserted into the insertion opening 21 to the transport path 22. The transport unit 23 transports each medium supplied to the transport path 22 along the transport path 22. The reading unit 24 captures an image of the medium transported along the transport path 22. The transport unit 23 further transports the medium with the image captured along the transport path 22 and discharges it from the main body 2 via the discharge opening 7. The image reading device 1 repeatedly transports the media and captures images of the media until all of the multiple media inserted into the insertion opening 21 have been discharged.

[0042] After finishing reading the images on the multiple media, the user rotates the mounting table 5 toward the storage position and places the mounting table 5 in the storage position. When the mounting table 5 is placed in the deployed position, the gravity of the extension member 6 is applied to the extension member 6 so that the extension member 6 moves toward the contracted position. At this time, the gravity of the extension member 6 is applied to the lever 45 so that the lever 45 moves to the protruding position. The elastic force of the spring 51 is further applied to the lever 45 so that the lever 45 moves to the protruding position.

[0043] As the mounting table 5 moves toward the storage position in the contact section, the end 49 of the mounting table main body 31 of the mounting table 5 moves away from the main body side abutment portion 47. When the end 49 of the mounting table main body 31 moves away from the main body side abutment portion 47, the lever 45 moves toward the protruding position due to the gravity of the extension member 6 and the elastic force of the spring 51. The force required to move the mounting table 5 toward the storage position in the contact section is reduced by the gravity of the extension member 6 applied to the lever 45 and the elastic force of the spring 51.

[0044] When the mounting table 5 is disposed in the separated section, the lever 45 moves away from the main body side abutment portion 47. When the lever 45 moves away from the main body side abutment portion 47, the lever 45 is disposed in the protruding position, and is fixed to the mounting table main body 31 of the mounting table 5 in the protruding position by the elastic force of the spring 51. When the lever 45 is disposed in the protruding position, the extension member 6 is disposed in the contracted position, and is fixed to the mounting table main body 31 in the contracted position by the elastic force of the spring 51. Since the mounting table 5 is fixed to the mounting table main body 31 with the extension member 6 disposed in the contracted position, the mounting table 5 can be appropriately disposed in the stored position and appropriately stored in the main body 2.

[0045] The image reading device 100 of the comparative example is the same as the image reading device 1 described above, except that the spring 51 has been omitted. FIG. 14 is a perspective view showing the image reading device of the comparative example. The extension member 6 of the image reading device 100 of the comparative example may move toward the extended position due to centrifugal force when the mounting table 5 rotates at high speed about the rotation shaft 8 and moves toward the storage position. When the extension member 6 is not positioned at the retracted position, the mounting table 5 of the image reading device 100 of the comparative example may not be appropriately positioned at the storage position because the extension member 6 gets caught on the main body 2.

[0046] The image reading device 1 is provided with a spring 51, so that when the mounting table 5 moves toward the storage position, the elastic force of the spring 51 counteracts the centrifugal force to fix the extension member 6 in the shortened position, thereby allowing the mounting table 5 to be appropriately positioned in the storage position.

[0047] [Effects of the medium conveying device of the first embodiment] The medium conveying device of the first embodiment includes a main body 2, a mounting table 5, an extension member 6, a lever 45, and an extension mechanism 46. The main body 2 is formed with a conveying path 22 along which the medium is conveyed. The mounting table 5 is supported by the main body 2 so as to be rotatable about a rotation axis 8 so as to move between a storage position and an expanded position via an intermediate position, and the medium is placed on the mounting table 5. The extension member 6 is movably supported by the mounting table 5 so as to move between a contracted position and an extended position. The lever 45 is movably supported by the mounting table 5 so as to move between a protruding position and a pushing position. The extension mechanism 46 converts the movement of the lever 45 into the movement of the extension member 6 so that the extension member 6 is disposed in the contracted position when the lever 45 is disposed in the protruding position, and so that the extension member 6 is disposed in the extended position when the lever 45 is disposed in the pushing position. The lever 45 moves away from a main body side abutment portion 47 fixed to the main body 2 when the mounting table 5 is disposed in a separation section between the storage position and the intermediate position. When the mounting table 5 is disposed in the contact section between the unfolded position and the intermediate position, the lever 45 comes into contact with the main body side abutment portion 47 and moves toward the pushed-in position when the mounting table 5 moves toward the unfolded position. The medium transport device of Example 1 can prevent the extension member 6 from moving toward the extended position when the mounting table 5 is disposed in the separated section because the lever 45 is away from the main body side abutment portion 47. The medium transport device of Example 1 can reduce the force required to move the mounting table 5 to the unfolded position when the mounting table 5 is disposed in the separated section because the extension member 6 is prevented from moving toward the extended position.

[0048] In the medium conveying device of the first embodiment, the first point where the center of gravity between the mounting table 5 and the extension member 6 is located when the mounting table 5 is located at the storage position is located in front of the vertical plane 15. The vertical plane 15 overlaps with the rotation axis 8 and is perpendicular to the installation plane along which the installation surface 10 on which the main body 2 is placed is aligned. The second point where the center of gravity between the mounting table 5 and the extension member 6 is located when the mounting table 5 is located at the deployment position and the third point where the center of gravity between the mounting table 5 and the extension member 6 is located when the mounting table 5 is located at the intermediate position are located on the rear side of the vertical plane 15. The distance from the third point to the installation plane is greater than the distance from the second point to the installation plane. In the medium conveying device of the first embodiment, when the installation surface 10 is aligned along a horizontal plane, the gravity between the mounting table 5 and the extension member 6 is converted into a force that moves the extension member 6 toward the extension position, and the force required for the operation of moving the mounting table 5 to the deployment position in the contact section can be reduced.

[0049] Furthermore, lever 45 of the medium transport device of Example 1 is supported by mounting table 5 rotatably about rotation axis 48 different from rotation axis 8. Extension member 6 is supported by mounting table 5 rotatably about rotation axis 40 parallel to rotation axis 48. In the medium transport device of Example 1, because rotation axis 48 of lever 45 and rotation axis 40 of extension member 6 are parallel, the structure of extension mechanism 46 can be simplified and manufacturing costs can be reduced.

[0050] In addition, the center of gravity of the extension member 6 of the medium conveying device of the first embodiment is located at the fourth point when the mounting table 5 is located in the contact section and the extension member 6 is located at the extended position. The center of gravity of the extension member 6 is located at the fifth point when the mounting table 5 is located in the contact section and the extension member 6 is located at the contracted position, and the fourth and fifth points are located on the left side of the vertical plane 42. The vertical plane 42 overlaps with the rotation axis 40 and is perpendicular to the installation plane. The distance from the fourth point to the installation plane is greater than the distance from the fifth point to the installation plane. In this case, the extension member 6 moves toward the contracted position due to the gravity of the extension member 6 and is located at the contracted position. The medium conveying device of the first embodiment does not need to provide a separate mechanism for applying a force to the extension member 6 to move the extension member 6 toward the contracted position, and can be simplified, thereby reducing manufacturing costs.

[0051] Furthermore, the extension mechanism 46 of the medium transport device of Example 1 includes a spring 51 that applies a force to the extension member 6 so that the extension member 6 moves toward the retracted position. The medium transport device of Example 1 can reliably position the extension member 6 at the retracted position because the spring 51 is provided. The medium transport device of Example 1 can properly position the mounting table 5 at the storage position because the extension member 6 is reliably positioned at the retracted position, and can properly store the mounting table 5 in the main body 2.

[0052] Furthermore, spring 51 of the medium transport device of Example 1 applies an elastic force to lever 45 so that lever 45 moves toward the pressed-in position. In the medium transport device of Example 1, the force that moves mounting table 5 toward the deployed position in the contact section can counter the elastic force of spring 51 without going through extension / contraction mechanism 46, and the force required for the operation to move mounting table 5 toward the deployed position can be reduced. EXAMPLES

[0053] As shown in Fig. 15, the medium conveying device of the second embodiment has the extension mechanism 46 of the medium conveying device of the first embodiment replaced with another extension mechanism 71, and other parts are the same as those of the medium conveying device of the first embodiment. Fig. 15 is a plan view showing the extension mechanism 71 of the medium conveying device of the second embodiment. The extension mechanism 71 has the lever side link 52 of the extension mechanism 46 replaced with another lever side link 72, and other parts are the same as those of the extension mechanism 46. That is, the extension mechanism 71 includes a spring 51, a lever side link 72, and an extension member side link 53.

[0054] The lever side link 72 is formed in a rod shape. The lever side link 72 is supported by the table main body 31 so as to be rotatable around the rotation shaft 48, and is fixed to the lever 45. As shown in FIG. 16, a long hole 73 is formed at the other end of the lever side link 72 opposite to the one end connected to the lever 45. FIG. 16 is an enlarged plan view showing the extension mechanism 71 of the medium conveying device of the second embodiment. The straight line along which the long hole 73 runs is inclined with respect to the straight line along which the lever side link 72 runs. The pin 55 fits into the long hole 73 and can translate along the long hole 73. The extension member side link 53 is supported by the lever side link 72 so as to be rotatable around the pin 55 by fitting the pin 55 into the long hole 73.

[0055] The telescopic mechanism 71 is thus formed to convert the movement of the lever 45 into the movement of the extension member 6 so that the extension member 6 is disposed at a position corresponding to the position at which the lever 45 is disposed. In other words, the telescopic mechanism 71 is formed so that when the lever 45 is disposed at the pressed-in position, the extension member 6 is disposed at the extended position.

[0056] When the lever 45 is located at the protruding position, the extension member 6 is located at the contracted position as shown in Fig. 17. Fig. 17 is a plan view showing the extension mechanism 71 of the medium transport device of the second embodiment when the lever 45 is located at the protruding position. That is, the extension mechanism 71 is further formed such that when the lever 45 is located at the protruding position, the extension member 6 is located at the contracted position. The medium transport device of the second embodiment can reduce the force that deploys the mounting table 5 because the lever 45 is not in contact with the main body side abutment portion 47 when the mounting table 5 is located in the separated section.

[0057] The telescopic mechanism 46 of the medium conveying device of the first embodiment described above may not be assembled properly when there is dimensional variation in the components of the telescopic mechanism 46. In the medium conveying device of the second embodiment, the lever-side link 72 is provided with the long hole 73, so that the telescopic mechanism 71 can be assembled properly even when there is dimensional variation in the components of the telescopic mechanism 71.

[0058] Incidentally, the medium transport device in the above-described embodiment is provided with the spring 51, but the spring 51 may be omitted. Even if the spring 51 is omitted, the medium transport device can reduce the force for deploying the mounting table 5 because the lever 45 is not in contact with the main body side abutment portion 47 when the mounting table 5 is disposed in the separated section.

[0059] Incidentally, the medium transport device of the embodiment described above is used in the image reading device 1, but may be used in other devices. An example of such a device is a printer that prints characters and figures on a medium. In the printer, the reading unit 24 of the medium transport device of the embodiment described above is replaced with a printing unit that prints characters and figures on a medium transported along the transport path 22. In this case as well, the medium transport device can reduce the force that deploys the mounting table 5.

[0060] Although the embodiments have been described above, the embodiments are not limited to the above. The above-described components include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the above-described components can be appropriately combined. Furthermore, at least one of various omissions, substitutions, and modifications of the components can be made without departing from the gist of the embodiments. [Explanation of symbols]

[0061] 1: Image reader 2: Main unit 5: Placement table 6: Extension member 8: Rotation axis 10: Installation surface 14: Center of gravity 15: Vertical plane 22: Transport path 40: Rotation axis 41: Center of gravity 42: Vertical plane 45: Lever 46: Telescopic mechanism 47: Main body side contact part 51: Spring 52: Lever side link 53: Extension member side link 54: Fitting hole 55: Pin 72: Lever side link 73: Long hole

Claims

1. a main body in which a transport path along which a medium is transported is formed; a mounting table on which the medium is placed, the mounting table being supported by the main body so as to be rotatable about a rotation axis so as to move between a storage position and an unfolded position via intermediate positions; an extension member movably supported on the mounting table so as to move between a retracted position and an extended position; a lever supported on the mounting table so as to be movable between a protruding position and a pushing position; a mechanism for converting movement of the lever into movement of the extension member such that the extension member is disposed in the contracted position when the lever is disposed in the extended position, and the extension member is disposed in the extended position when the lever is disposed in the pressed position, The lever is When the mounting table is disposed in the spaced section between the storage position and the intermediate position, the mounting table is separated from the abutting portion fixed to the main body, When the mounting table is disposed in a contact section between the deployed position and the intermediate position, the mounting table comes into contact with the abutment portion when moving toward the deployed position, and moves toward the push-in position; a second point where the center of gravity of the mounting table and the extension member is located when the mounting table is located at the deployed position, and a third point where the center of gravity of the mounting table and the extension member is located when the mounting table is located at the intermediate position are located on the opposite side of one side of a vertical plane that includes the rotation axis and is perpendicular to an installation plane along which an installation surface on which the main body is placed is aligned, the second point where the center of gravity of the mounting table and the extension member is located when the mounting table is located at the deployed position, and the third point where the center of gravity of the mounting table and the extension member is located when the mounting table is located at the intermediate position are located, The distance from the third point to the installation plane is greater than the distance from the second point to the installation plane. Media handling device.

2. the lever is supported by the mounting table so as to be rotatable about a first rotation axis different from the rotation axis; The extension member is supported by the mounting table so as to be rotatable about a second rotation axis that is parallel to the first rotation axis. The media transport device of claim 1 .

3. The second rotation axis is perpendicular to the first rotation axis, a fifth point, on one side of a fourth point at which the center of gravity of the extension member is located when the mounting table is disposed in the contact section and the extension member is disposed in the contracted position, the fifth point, on one side of a fourth point at which the center of gravity of the extension member is located when the mounting table is disposed in the contact section and the extension member is disposed in the contracted position, the fifth point, on which the center of gravity of the extension member is located when the mounting table is disposed in the contact section and the extension member is disposed in the contracted position, the fifth point, on which the center of gravity of the extension member is located when the mounting table is disposed in the contact section and the extension member is disposed in the contracted position, The distance from the fourth point to the installation plane is greater than the distance from the fifth point to the installation plane. The media transport device of claim 2 .

4. The mechanism comprises: a link supported by the extension member so as to be rotatable about a third rotation axis parallel to the second rotation axis; A pin fixed to the link; a connection portion fixed to the lever; The link is further rotatably supported by the connection portion by fitting the pin into an oval formed in the connection portion, The pin is translatable relative to the lever along the oval. The medium transport device according to claim 2 or 3.

5. The mechanism includes a biasing portion that applies a force to the extension member to move the extension member toward the retracted position. The medium transport device according to claim 1 .

6. The biasing portion applies an elastic force to the lever so that the lever moves toward the pressed-in position, thereby applying the force to the extension member. The medium transport device of claim 5 .

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