WO2020188826A1

WO2020188826A1 - Medium transport device

Info

Publication number: WO2020188826A1
Application number: PCT/JP2019/011923
Authority: WO
Inventors: 祥悟吉田
Original assignee: 株式会社Pfu
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2020-09-24
Also published as: JPWO2020188826A1; US20220002105A1

Abstract

This medium transport device comprises a medium tray (3) on which a medium is placed, a skew correction unit (21) that rotates the medium so that a part of an edge of the medium is along a designated straight line, a rotation member (31) that contacts the medium, and a transport unit (20) that transports the medium in a transport direction (45). The rotation member (31) is rotatably supported by the medium tray (3) so as to rotate to follow the medium when the medium moves in a direction different from the transport direction (45).

Description

Media transfer device

The technology of the present disclosure relates to a medium transfer device.

There is known a medium transporting device that corrects the skew so that the tilt is reduced when the transported medium tilts (see Patent Document 1). Such a medium transporting device can reduce the time and effort for the user to arrange the media and prevent a paper jam of the medium due to skewing.

Japanese Unexamined Patent Publication No. 10-250877

However, the medium placed on the medium tray may not be properly corrected for the skew of the medium due to friction with the medium tray.

The disclosed technology was made in view of this point, and an object of the present invention is to provide a medium transport device that appropriately corrects the skew of the medium.

The medium transfer device according to one embodiment is in contact with the medium tray on which the medium is placed, the skew correction portion that rotates the medium so that a part of the edge of the medium follows a predetermined straight line, and the medium. It includes a rotating member and a transport unit that transports the medium in the transport direction. The rotating member is rotatably supported by the medium tray so that it rotates following the medium when the medium moves in a direction different from the transport direction.

The disclosed medium transfer device can appropriately correct the skew of the medium.

FIG. 1 is a side sectional view showing an image reading device provided with the medium transporting device of the first embodiment. FIG. 2 is a perspective view showing an image reading device. FIG. 3 is a cross-sectional view showing a rotating sphere. FIG. 4 is a side view showing the separated portion. FIG. 5 is a perspective view showing the medium tray and the skew correction portion. FIG. 6 is a plan view showing a medium conveyed by the separation unit. FIG. 7 is a perspective view showing a medium tray of the medium transport device of the second embodiment. FIG. 8 is a perspective view showing a medium tray of the medium transport device of the third embodiment. FIG. 9 is a perspective view showing the medium transport device of the fourth embodiment. FIG. 10 is a side view showing a separated portion of the medium transport device of the fifth embodiment. FIG. 11 is a plan view showing a medium transported by a separation unit of the medium transport device of the fifth embodiment.

The medium transfer device according to the embodiment disclosed in the present application will be described below with reference to the drawings. The following description does not limit the technology of the present disclosure. Further, in the following description, the same reference numerals are given to the same components, and duplicate description will be omitted.

The medium transfer device of the first embodiment is provided in the image reading device 1 as shown in FIG. FIG. 1 is a side sectional view showing an image reading device 1 provided with the medium transporting device of the first embodiment. The image reading device 1 includes an image reading device main body 2 and a medium tray 3. The image reading device main body 2 is formed in a box shape and is placed on an installation surface 5 on which the image reading device 1 is installed. The image reading device main body 2 has a paper feed port 6 and a discharge port 7. The paper feed port 6 is formed on the rear side of the image reading device 1. The discharge port 7 is formed on the front side opposite to the rear side where the paper feed port 6 of the image reading device 1 is formed.

The medium tray 3 is arranged near the paper feed port 6 on the rear side of the image reader main body 2. The medium tray 3 has a mounting surface 8. In the medium tray 3, the distance between the end of the mounting surface 8 near the paper feed port 6 and the installation surface 5 is the distance between the end of the mounting surface 8 far from the paper feed port 6 and the installation surface 5. It is arranged at an angle so as to be smaller than the distance between them, and is fixed to the image reading device main body 2.

The image reading device main body 2 further has a transport path 14. The transport path 14 is formed inside the image reading device main body 2. One end of the transport path 14 is connected to the paper feed port 6, and the other end of the transport path 14 is connected to the discharge port 7.

The image reading device 1 further includes a transport unit 20. The transport unit 20 includes a skew correction unit 21, a feed roller 22, and a pressure roller 23. The skew correction portion 21 includes a separation portion 24 and a resist roller pair 25. The separation unit 24 is arranged in the vicinity of the paper feed port 6 of the transport path 14. The resist roller pair 25 is arranged between the separation portion 24 of the transport path 14 and the discharge port 7.

The feed roller 22 is formed in a columnar shape. The feed roller 22 is arranged between the resist roller pair 25 on the lower side of the transport path 14 and the discharge port 7, and is rotatably supported by the image reader main body 2. The pressure roller 23 is formed in a columnar shape. The pressure roller 23 is arranged above the feed roller 22 on the upper side of the transport path 14. The pressure roller 23 is rotatably supported by the image reader main body 2. The pressure roller 23 presses the medium arranged in the transport path 14 against the feed roller 22. The feed roller 22 rotates counterclockwise in FIG. 1 to convey the medium pressed against the feed roller 22 toward the discharge port 7 along the transfer path 14.

The image reading device 1 further includes a lower reading unit 26 and an upper reading unit 27. The lower reading unit 26 is formed of a CIS (Contact Image Sensor) type image sensor. The lower reading unit 26 is arranged between the resist roller pair 25 and the feed roller 22 on the lower side of the transport path 14. The lower reading unit 26 reads an image of the lower surface of the medium conveyed along the conveying path 14. The upper reading unit 27 is formed of a CIS type image sensor. The upper reading unit 27 is arranged between the resist roller pair 25 and the pressure roller 23 on the upper side of the transport path 14 and above the lower reading unit 26. The upper reading unit 27 reads an image of the upper surface of the medium conveyed along the conveying path 14.

FIG. 2 is a perspective view showing the image reading device 1. The image reading device 1 further includes a rotating sphere 31. The rotating sphere 31 is arranged substantially in the center of the medium tray 3. The rotating sphere 31 is formed in a spherical shape as shown in FIG. FIG. 3 is a cross-sectional view showing the rotating sphere 31. The rotating sphere 31 is arranged so that a part of the rotating sphere 31 protrudes from the mounting surface 8 of the medium tray 3 and the other part of the rotating sphere 31 is embedded in the medium tray 3. .. The rotating sphere 31 is rotatably supported by the medium tray 3 in a direction of 360 ° about the center point 32 of the sphere.

The medium contact portion 33 is included in a portion of the rotating sphere 31 protruding from the mounting surface 8, and the line segment 35 connecting the medium contact portion 33 and the center point is orthogonal to the plane 34. The medium contact portion 33 may come into contact with the medium 36 placed on the medium tray 3.

FIG. 4 is a side view showing the separation unit 24. The separation unit 24 includes a separation roller 41 and a brake roller 42. The separation roller 41 is formed in a columnar shape and is arranged at the lower part of the transport path 14. The separation roller 41 is rotatably supported by the image reader main body 2. The brake roller 42 is arranged on the upper side of the transport path 14 and on the upper side of the separation roller 41 so as to come into contact with the separation roller 41. The brake roller 42 is rotatably supported by the image reader main body 2.

The separation unit 24 includes a drive source and a torque limiter (not shown). The drive source produces rotational power. The separation roller 41 rotates forward counterclockwise in FIG. 4 by transmitting the rotational power generated by the drive source. The torque limiter transmits the rotational power generated by the drive source to the brake roller 42 when the load applied to the brake roller 42 is smaller than the predetermined value, and the drive source when the load applied to the brake roller 42 is larger than the predetermined value. The rotational power generated by the brake roller 42 is not transmitted to the brake roller 42. The brake roller 42 rotates counterclockwise in FIG. 4 by transmitting the rotational power generated by the drive source. Since the rotational power of the brake roller 42 is transmitted via the torque limiter, a load larger than a predetermined value is applied when the brake roller 42 comes into contact with the separation roller 41, and the brake roller 42 rotates forward clockwise following the separation roller 41.

The plurality of media 43 placed on the medium tray 3 move toward the separation portion 24 due to their own weight due to the inclination of the medium tray 3, and come into contact with the separation roller 41 and the brake roller 42. The separation roller 41 rotates forward to allow a plurality of media 43 to enter between the separation roller 41 and the brake roller 42. When a plurality of media are sandwiched between the separation roller 41 and the brake roller 42, the brake roller 42 rotates in the reverse direction without applying a load larger than a predetermined value. By rotating in the reverse direction, the brake roller 42 conveys the medium that is not in contact with the separation roller 41 among the plurality of media sandwiched between the separation roller 41 and the brake roller 42 toward the medium tray 3. By rotating forward, the separation roller 41 further conveys the medium 44 in contact with the separation roller 41 in the transfer direction 45 along the transfer path 14. When one medium 44 is sandwiched between the separation roller 41 and the brake roller 42, the brake roller 42 receives a load larger than a predetermined value from the separation roller 41 via the medium 44, so that the separation roller 41 Follows and rotates forward.

FIG. 5 is a perspective view showing the medium tray 3 and the skew correction portion 21. The resist roller pair 25 includes a right side feed roller 51, a left side feed roller 52, a right side pressure roller 53, and a left side pressure roller 54. The right feed roller 51 is formed in a columnar shape, is arranged on the lower side of the transport path 14, and is rotatably supported by the image reader main body 2 about the rotation shaft 55. The rotation shaft 55 is parallel to the plane along the mounting surface 8 and perpendicular to the transport direction 45. The left feed roller 52 is formed in a columnar shape with the same radius as the right feed roller 51. The left feed roller 52 is arranged below the transport path 14, and is rotatably supported by the image reader main body 2 about the rotation shaft 55.

The right pressure roller 53 is formed in a columnar shape, is arranged on the upper side of the transport path 14 so as to come into contact with the right feed roller 51, and is rotatably supported by the image reader main body 2 about the rotation shaft 56. .. The rotating shaft 56 is parallel to the rotating shaft 55. The left pressure roller 54 has the same radius as the right pressure roller 53 and is formed in a columnar shape. The left pressure roller 54 is arranged above the transport path 14 so as to come into contact with the left feed roller 52, and is rotatably supported by the image reader main body 2 about the rotation shaft 56.

[Operation of image reader 1]
When the user wants to read an image of one medium using the image reading device 1, the user places one medium on the medium tray 3, and wants to read images of a plurality of media using the image reading device 1. , A plurality of media are placed on the medium tray 3. Since the medium tray 3 is tilted, the medium mounted on the medium tray 3 moves in the transport direction 45 along the mounting surface 8 toward the paper feed port 6 due to its own weight, and is moved to the paper feed port 6. It is inserted and comes into contact with the separating portion 24. At this time, the rotating sphere 31 rotates following the medium so that the medium contact portion 33 moves in the transport direction 45. The image reading device 1 can reliably move the medium by reducing the frictional force that prevents the medium from moving with respect to the medium tray 3 by rotating the rotating sphere 31 following the medium. , The medium can be appropriately brought into contact with the separation unit 24.

After placing the medium on the medium tray 3, the user operates the image reading device 1 to cause the image reading device 1 to start the image reading operation. When the image reading operation is started, the separation unit 24 rotates the separation roller 41 in the forward direction and the brake roller 42 in the reverse direction without rotating the resist roller pair 25. The medium in contact with the separation portion 24 enters between the separation roller 41 and the brake roller 42 due to the forward rotation of the separation roller 41, and is sandwiched between the separation roller 41 and the brake roller 42. Of the plurality of media sandwiched between the separation roller 41 and the brake roller 42, the medium that is not in contact with the separation roller 41 is conveyed toward the medium tray 3 by the reverse rotation of the brake roller 42. ..

One medium in contact with the separation roller 41 is conveyed in the transfer direction 45 toward the resist roller pair 25 along the transfer path 14 by the forward rotation of the separation roller 41. When one medium is sandwiched between the separation roller 41 and the brake roller 42, the brake roller 42 receives a load larger than a predetermined value from the separation roller 41 via the medium 44 to the separation roller 41. It follows and rotates forward.

When the plurality of media 62 placed on the medium tray 3 are not aligned, skew may occur in one medium 61 conveyed by the separation unit 24, as shown in FIG. .. FIG. 6 is a plan view showing the medium 61 conveyed by the separation unit 24. That is, the tip 63 of the medium 61 may hit the left feed roller 52 before hitting the right feed roller 51 of the skew correction portion 21. The medium 61 rotates so that the tip 63 approaches the right feed roller 51 by being further conveyed to the separating portion 24 after the tip 63 hits the left feed roller 52. The tip 63 abuts on both the left feed roller 52 and the right feed roller 51 as the medium 61 rotates. The medium 61 is arranged so that when the tip 63 abuts on both the left feed roller 52 and the right feed roller 51, the skew is corrected and the straight line along the tip 63 is parallel to the axis of rotation 55. ..

The tip 63 of the medium 61 may hit the right feed roller 51 before hitting the left feed roller 52 of the skew correction portion 21. The medium 61 rotates so that the tip 63 approaches the left feed roller 52 by being further conveyed to the separating portion 24 after the tip 63 hits the right feed roller 51. The tip 63 abuts on both the left feed roller 52 and the right feed roller 51 as the medium 61 rotates. The medium 61 is arranged so that when the tip 63 abuts on both the left feed roller 52 and the right feed roller 51, the skew is corrected and the straight line along the tip 63 is parallel to the axis of rotation 55. ..

The rotating sphere 31 rotates following the medium so that the medium contact portion 33 moves in a direction different from the transport direction 45 when the medium rotates. The image reading device 1 appropriately rotates the medium by reducing the frictional force that prevents the medium from rotating with respect to the medium tray 3 by rotating the rotating sphere 31 following the medium, so that the medium can be rotated appropriately. The skew can be corrected appropriately.

The skew correction section 21 rotates the right side feed roller 51 and the left side feed roller 52 in the forward direction after a predetermined time has elapsed after the separation roller 41 rotates forward. The predetermined time is set to a time sufficient for the tip 63 of the medium 61 to abut on both the left feed roller 52 and the right feed roller 51 after the separation roller 41 rotates forward. The portion of the medium that abuts on the right feed roller 51 enters between the right feed roller 51 and the right pressure roller 53 due to the forward rotation of the right feed roller 51, and enters the right feed roller 51 by the right pressure roller 53. Be pressed. Further, the portion of the medium abutting against the left feed roller 52 enters between the left feed roller 52 and the left pressure roller 54 due to the forward rotation of the left feed roller 52, and the left feed roller 54 causes the left feed roller 54 to enter between the left feed roller 52 and the left pressure roller 54. It is pressed against 52. The medium pressed against the right feed roller 51 and the left feed roller 52 enters the transport path 14 with the skew corrected by the forward rotation of the right feed roller 51 and the left feed roller 52. It is conveyed toward the discharge port 7 along the line.

The medium conveyed by the right feed roller 51 and the left feed roller 52 toward the discharge port 7 along the transfer path 14 is conveyed between the lower reading unit 26 and the upper reading unit 27 of the transfer path 14. To. The lower reading unit 26 captures an image of the lower side of the medium transported along the transport path 14. The upper reading unit 27 captures an image of the upper side of the medium transported along the transport path 14.

The transport unit 20 rotates the feed roller 22 forward when the right feed roller 51 and the left feed roller 52 are rotating forward. The medium conveyed between the lower reading unit 26 and the upper reading unit 27 then comes into contact with the feed roller 22 and the pressure roller 23. The medium in contact with the feed roller 22 and the pressure roller 23 enters between the feed roller 22 and the pressure roller 23 due to the forward rotation of the feed roller 22, and is pressed against the feed roller 22 by the pressure roller 23. The medium pressed against the feed roller 22 is conveyed toward the discharge port 7 along the transport path 14 by the forward rotation of the feed roller 22, and is discharged from the discharge port 7.

[Effect of the medium transfer device of Example 1]
The medium transfer device of the first embodiment includes a medium tray 3 on which the medium is placed, an oblique correction section 21 that rotates the medium so that the tip of the medium follows a predetermined straight line, and a rotating sphere 31 that comes into contact with the medium. And a transport unit 20 that transports the medium in the transport direction 45. The rotating sphere 31 is rotatably supported by the medium tray 3 so that it rotates following the medium when the medium moves in a direction different from the transport direction 45. At this time, in the medium transport device, when the skew correction unit 21 corrects the skew of the medium, the rotating sphere 31 rotates following the rotation of the medium, so that the medium rotates with respect to the medium tray 3. By reducing the frictional force that hinders the media, the skew of the medium can be appropriately corrected.

Further, the medium transport device of the first embodiment further includes a separation unit 24 that separates the medium in contact with the medium tray 3 from the plurality of media placed on the medium tray 3. The frictional force applied to the bottom medium of the plurality of media placed on the medium tray 3 is larger than the frictional force applied to the top medium of the plurality of media placed on the medium tray 3. .. Even if the medium transport device is a lower take-out method that separates the bottom medium from a plurality of media placed on the medium tray 3, the frictional force that prevents the medium from rotating with respect to the medium tray 3 is reduced. By doing so, the skew of the medium can be appropriately corrected.

Further, since the rotating sphere 31 of the medium transfer device of the first embodiment can rotate in the direction of 360 °, it can also rotate in the transfer direction 45. The medium transfer device of the first embodiment can appropriately convey the medium by reducing the frictional force applied to the medium when the medium is conveyed by rotating the rotating sphere 31 in the transfer direction 45.

The medium transfer device of the first embodiment described above is provided with one rotating sphere 31, but a plurality of rotating spheres may be provided. In the medium transfer device of the second embodiment, as shown in FIG. 7, the medium transfer device of the first embodiment is further provided with another rotating sphere 71, and the other portion is the above-described first embodiment. It is the same as the medium transfer device of. FIG. 7 is a perspective view showing the medium tray 3 of the medium transfer device of the second embodiment. The rotating sphere 71 is formed in a spherical shape like the rotating sphere 31, is arranged closer to the paper feed port 6 than the rotating sphere 31 of the medium tray 3, and can rotate in the direction of 360 ° around the center point of the sphere. It is supported by the medium tray 3.

Similar to the rotating sphere 31, the rotating sphere 71 can reduce the frictional force applied to the medium from the medium tray 3 by rotating following the medium when the medium rotates with respect to the medium tray 3. .. Therefore, the medium transfer device of the second embodiment can further reduce the frictional force applied to the medium from the medium tray 3 as compared with the medium transfer device of the first embodiment described above, and the skew of the medium is further reduced. Can be corrected appropriately.

In the medium transfer device of the third embodiment, as shown in FIG. 8, the medium transfer device of the second embodiment described above further includes a right-side rotating sphere 72 and a left-side rotating sphere 73, and the other parts are , The same as the medium transfer device of the second embodiment described above. FIG. 8 is a perspective view showing the medium tray 3 of the medium transfer device of the third embodiment. The right rotating sphere 72 is formed in a spherical shape like the rotating sphere 31, is arranged on the right side of the rotating sphere 31 and the rotating sphere 71 of the medium tray 3, and can rotate in the direction of 360 ° about the center point of the sphere. It is supported by the medium tray 3. The left rotating sphere 73 is formed in a spherical shape like the rotating sphere 31, is arranged on the left side of the rotating sphere 31 and the rotating sphere 71 of the medium tray 3, and can rotate in the direction of 360 ° around the center point of the sphere. It is supported by the medium tray 3. The right-side rotating sphere 72 and the left-side rotating sphere 73 are arranged so as to be symmetrical with respect to a straight line overlapping the rotating sphere 31 and the rotating sphere 71.

Similar to the rotating sphere 31, the right-side rotating sphere 72 and the left-side rotating sphere 73 rotate following the medium when the medium rotates with respect to the medium tray 3, so that the friction applied to the medium from the medium tray 3 is applied. The force can be reduced. Therefore, the medium transfer device of the third embodiment can further reduce the frictional force applied to the medium from the medium tray 3 as compared with the medium transfer device of the second embodiment described above, and the skew of the medium is further reduced. Can be corrected appropriately.

The rotating sphere 31 of the medium transport device according to the first embodiment described above is supported by the medium tray 3 so as to be rotatable in a direction of 360 ° about the center point of the sphere, but can be rotated about one rotation axis. May be supported by the medium tray 3. In the medium transfer device of the fourth embodiment, as shown in FIG. 9, the rotating sphere 31 of the medium transfer device of the first embodiment described above includes the right side rotating member 81, the left side rotating member 82, and the central rotating member. It is replaced with 83, and other parts are the same as the medium transfer device of the first embodiment described above. FIG. 9 is a perspective view showing the medium transport device of the fourth embodiment. The right-side rotating member 81 is formed in a columnar shape, is arranged on the side close to the right side surface of the medium tray 3, and is rotatably supported by the medium tray 3 around the rotating shaft 84. The rotation shaft 84 is parallel to the plane along the mounting surface 8 and is inclined with respect to the transport direction 45 so as not to be perpendicular to the transport direction 45 and not to be parallel to the transport direction 45. The left-side rotating member 82 is formed in a columnar shape, is arranged on the side close to the left side surface of the medium tray 3, and is rotatably supported by the medium tray 3 around the rotating shaft 85. The rotating shaft 85 is parallel to the plane along the mounting surface 8 and is inclined with respect to the transport direction 45 so as not to be perpendicular to the transport direction 45 and not to be parallel to the transport direction 45. The central rotating member 83 is formed in a columnar shape, is arranged between the right side rotating member 81 and the left side rotating member 82 of the medium tray 3, and is rotatably supported by the medium tray 3 around the rotating shaft 86. The rotation shaft 86 is parallel to the transport direction 45.

The portion of the medium placed on the medium tray 3 in contact with the central rotating member 83 follows the medium and is parallel to the transport direction 45 when the skew correction portion 21 corrects the skew of the medium. By rotating around the rotation shaft 86, the frictional force applied to the medium from the medium tray 3 when the skew of the medium is corrected can be reduced, and the skew of the medium can be appropriately corrected.

Further, the right-side rotating member 81 and the left-side rotating member 82 are formed so as to be rotatable in substantially the same direction as the direction of rotation when the skew of the medium placed on the medium tray 3 is corrected by the skew correction portion 21. ing. Therefore, the right-side rotating member 81 and the left-side rotating member 82 can reduce the frictional force applied to the medium from the medium tray 3 when the skew of the medium is corrected, and the skew of the medium can be appropriately corrected. Can be done. That is, the medium transfer device of the fourth embodiment can reduce the frictional force applied to the medium from the medium tray 3 when the skew of the medium is corrected, similarly to the medium transfer device of the above-described embodiment. The skew of the medium can be corrected appropriately.

By the way, the separation unit 24 of the medium transport device of the first embodiment described above separates the lowest medium from the plurality of media placed on the medium tray 3, but is placed on the medium tray 3. The top medium may be separated from the plurality of media. In the medium transfer device of the fifth embodiment, as shown in FIG. 10, the separation unit 24 of the medium transfer device of the first embodiment has been replaced with another separation unit 91, and the other parts are described above. It is the same as the medium transfer apparatus of Example 1. FIG. 10 is a side view showing the separation unit 91 of the medium transfer device of the fifth embodiment. The separation unit 91 includes a separation roller 92 and a brake roller 93. The separation roller 92 is formed in a columnar shape and is arranged in the upper part of the transport path 14. The separation roller 92 is rotatably supported by the image reader main body 2. The brake roller 93 is arranged below the transport path 14 and below the separation roller 92 so as to come into contact with the separation roller 92. The brake roller 93 is rotatably supported by the image reader main body 2.

The separation unit 91 includes a drive source and a torque limiter (not shown). The drive source produces rotational power. The separation roller 92 rotates forward clockwise in FIG. 10 by transmitting the rotational power generated by the drive source. The torque limiter transmits the rotational power generated by the drive source to the brake roller 93 when the load applied to the brake roller 93 is smaller than the predetermined value, and the drive source when the load applied to the brake roller 93 is larger than the predetermined value. The rotational power generated by the brake roller 93 is not transmitted to the brake roller 93. The brake roller 93 rotates counterclockwise in FIG. 10 by transmitting the rotational power generated by the drive source. Since the rotational power of the brake roller 93 is transmitted via the torque limiter, a load larger than a predetermined value is applied when the brake roller 93 comes into contact with the separation roller 92, and the brake roller 93 rotates forward counterclockwise following the separation roller 92.

The plurality of media 94 placed on the medium tray 3 move toward the separation portion 91 due to their own weight due to the inclination of the medium tray 3, and come into contact with the separation roller 92 and the brake roller 93. The separation roller 92 rotates forward to allow a plurality of media 94 to enter between the separation roller 92 and the brake roller 93. When a plurality of media are sandwiched between the separation roller 92 and the brake roller 93, the brake roller 93 rotates in the reverse direction without applying a load larger than a predetermined value. By rotating in the reverse direction, the brake roller 93 conveys the medium that is not in contact with the separation roller 92 among the plurality of media sandwiched between the separation roller 92 and the brake roller 93 toward the medium tray 3. By rotating forward, the separation roller 92 further conveys the medium 95 in contact with the separation roller 92 in the transfer direction 45 along the transfer path 14. When one medium 95 is sandwiched between the separation roller 92 and the brake roller 93, the brake roller 93 receives a load larger than a predetermined value from the separation roller 92 via the medium 95, thereby causing the separation roller 93. It follows 92 and rotates forward.

When a plurality of media 94 mounted on the medium tray 3 are not aligned, skew may occur in the medium 95 conveyed by the separation unit 91 as shown in FIG. FIG. 11 is a plan view showing the medium 95 transported by the separation unit 91 of the medium transport device of the fifth embodiment. That is, the tip 96 of the medium 95 may hit the left feed roller 52 before hitting the right feed roller 51. The medium 95 rotates so that the tip 96 approaches the right feed roller 51 by being further conveyed to the separation portion 91 after the tip 96 hits the left feed roller 52. The tip 96 abuts on both the left feed roller 52 and the right feed roller 51 as the medium 95 rotates. The medium 95 is arranged so that when the tip 96 hits both the left feed roller 52 and the right feed roller 51, the skew is corrected and the straight line along the tip 96 is parallel to the axis of rotation 55. .. The tip 96 of the medium 95 may hit the right feed roller 51 before hitting the left feed roller 52. Also in this case, the medium 95 rotates so as to abut against both the left feed roller 52 and the right feed roller 51, and the skew is corrected.

The plurality of media 94 rotate together with the medium 95 due to the rotation of the medium 95 when the frictional force between the plurality of media 94 and the medium 95 is large. When the plurality of media 94 rotate together with the medium 95, the rotating sphere 31 rotates following the plurality of media 94. The medium transfer device of the fifth embodiment reduces the frictional force that prevents the plurality of media 94 from rotating against the medium tray 3 by rotating the rotating sphere 31 following the plurality of media 94. The plurality of media 94 can be rotated appropriately. The medium transfer device of the fifth embodiment can appropriately correct the skew of the medium 95 by appropriately rotating the plurality of media 94.

By the way, the skew correction section 21 of the medium transport device of the first embodiment described above corrects the skew of the medium by the resist roller method, but the skew of the medium can also be corrected by another method. Examples of the method include a butt member method and an independent drive roller method. The abutting member method is known and is described in JP-A-2000-136501. The independent drive roller system is known and is described in JP-A-2000-95384. The medium transport device of the above-described embodiment reduces the frictional force applied to the medium when the medium rotates, and appropriately corrects the skew of the medium even when the skew of the medium is corrected by another method. be able to.

By the way, the medium transfer device of the above-described embodiment is used for the image reading device, but may be used for other devices. An example of the device is a printer. For example, when a medium carrier device is used in a printer, the reading unit is replaced with a printing unit that prints a figure on a medium. Even when the medium transport device of the above-described embodiment is used in a device different from the image reading device, the skew of the medium can be appropriately corrected.

Although the examples have been described above, the examples are not limited by the contents described above. Further, the above-mentioned components include those that can be easily assumed by those skilled in the art, those that are substantially the same, that is, those having a so-called equal range. Further, the above-mentioned components can be appropriately combined. Further, at least one of the various omissions, substitutions and changes of the components may be made without departing from the gist of the embodiment.

1: Image reading device 2: Image reading device main body 3: Medium tray 20: Conveying part 21: Oblique correction part 24: Separation part 31: Rotating sphere 33: Medium contact part 45: Conveying direction 71: Rotating sphere 72: Rotating to the right Sphere 73: Left rotating sphere 81: Right rotating member 82: Left rotating member 83: Central rotating member 84: Rotating axis 85: Rotating axis 86: Rotating axis 91: Separation part

Claims

The medium tray on which the medium is placed and
An oblique correction section that rotates the medium so that a part of the edge of the medium follows a predetermined straight line.
The rotating member in contact with the medium and
A transport unit for transporting the medium in the transport direction is provided.
The rotating member is a medium transport device that is rotatably supported by the medium tray so that the medium rotates following the medium when the medium moves in a direction different from the transport direction.
The medium transfer device according to claim 1, further comprising a separating unit for separating the medium in contact with the medium tray among the plurality of media placed on the medium tray from the plurality of media.
The medium transfer device according to claim 1, wherein the rotating member is rotatably supported by the medium tray so as to rotate in the transfer direction.
Further comprising other rotating members in contact with the medium
The medium according to claim 1, wherein the other rotating member is rotatably supported by the medium tray so that the medium rotates following the medium when the medium moves in a direction different from the transport direction. Conveyor device.