JP2011225327A - Automatic document feeding apparatus and document reading device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic document feeding apparatus (ADF) which has a sheet-shaped member for carrying out press-contact of the document and which can expose a document conveying route by opening a part where the sheet-shaped member is attached with simple constitution.SOLUTION: The ADF includes an opening/closing shaft 82, an opening/closing guide 81, a document conveying route 40, a sheet pasting plate 85 and a platen sheet 51. The opening/closing guide 81 has a slide member 83 which can slide in a direction of approaching the opening/closing shaft 82 and in a direction of retreating therefrom and further can be opened/closed by rotation around the opening/closing shaft 82. The document conveying route 40 is a route for conveying the document and is exposed when the opening/closing guide 81 is opened. The sheet pasting plate 85 has a sheet fixing surface 855. The platen sheet 51 has flexibility and is stuck onto the sheet fixing surface 855 near the opening/closing shaft 82 and onto an attaching surface 835 which the slide member 83 has.

Description

  The present invention relates to an automatic document feeder and a document reading device that reads image information while conveying a document by the automatic feeding and conveying device.

  2. Description of the Related Art Conventionally, there is known a document reading apparatus in which an automatic document feeder (auto document feeder, ADF) and a flat bed are integrated. In this document reading apparatus, an automatic document feeder is generally arranged on a document table cover as a flat bed cover.

  In this type of document reading apparatus, a platen sheet for pressing the document against the platen glass needs to be attached to the lower part of the automatic document feeder and the lower surface of the document table cover. However, the lower part of the automatic document feeder needs to be opened to remove a jammed document (a jammed document) when a document jam occurs. In this regard, Patent Documents 1 and 2 disclose a configuration in which a platen sheet is attached while the lower portion of the automatic document feeder is openable.

  The configuration of Patent Document 1 includes a slide rail that is slidable with respect to a lower cover (a member disposed at the lower end of the document table cover). A platen sheet is attached to the slide rail, and the platen sheet can be slid along the lower cover. The configuration of Patent Document 2 is configured such that the platen sheet is bent between the automatic document feeder and the document table cover when the automatic document feeder is opened.

  According to the configurations of Patent Documents 1 and 2 described above, it is considered that an excessive force can be prevented from being applied to the platen sheet when the lower portion of the automatic document feeder is opened.

JP 2002-278174 A Japanese Patent No. 3640955

  However, the configuration of Patent Document 1 needs to include a long slide rail along the platen cover, which makes the configuration complicated and expensive.

  Further, in the configuration of Patent Document 2, the platen sheet is bent, so that not only the path for conveying the document but also the drive mechanism and the like may be exposed. In this case, dust or the like enters the drive mechanism and the like, which may adversely affect the automatic document feeder. In addition, the platen sheet may be bent to give anxiety to the user.

  The present invention has been made in view of the above circumstances, and its main object is to provide a sheet-like member for press-contacting a document, and to open a portion where the sheet-like member is attached with a simple configuration. An object of the present invention is to provide an automatic document feeder capable of exposing a document conveyance path.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, an automatic document feeder having the following configuration is provided. That is, the automatic document feeder includes an opening / closing shaft, an opening / closing unit, a document conveying path, a fixing unit, and a sheet-like member. The opening / closing portion has a slide member that can slide in a direction approaching and leaving the opening / closing axis, and can be opened / closed by rotating about the opening / closing axis. The document transport path is a path for transporting a document, and is exposed when the opening / closing portion is opened. The fixing portion has a fixing surface. The sheet-like member has flexibility, and is attached to the vicinity of the opening / closing axis of the fixed surface and the slide surface of the slide member.

  As a result, when the opening / closing part is opened in order to eliminate jamming (document jamming) and the like, the sheet-like member slides together with the slide member, so that an unreasonable force is exerted on the sheet-like member (particularly, near the opening / closing axis). Hanging can be prevented by using a compact configuration. Further, when the opening / closing part is opened, the sheet-like member bends while maintaining a state along the opening / closing part and the fixing part, so when a drive mechanism or the like is disposed inside the sheet-like member, It is possible to prevent dust and the like from entering the drive mechanism and the like.

  The automatic document feeder preferably has the following configuration. That is, one of the opening / closing portion and the slide member includes a regulation pin. In addition, a restriction hole is formed in the other of the opening / closing part and the slide member. And the slide range of the said slide member is controlled when the said control pin is inserted in the said control hole.

  Thereby, it is possible to prevent the slide member from sliding excessively, and thus it is possible to prevent an excessive force from being applied to the slide member and the sheet-like member. Therefore, it is possible to prevent the slide member and the sheet-like member from being damaged.

  In the automatic document feeder, when viewed in the axial direction of the opening / closing shaft, the virtual perpendicular dropped from the opening / closing shaft to the sheet-like member is fixed more than the end of the sliding member on the fixed portion side. The part side is preferable.

  Thereby, it can prevent that the sheet-like member between a slide member and a fixing | fixed part deform | transforms locally locally by opening and closing of an opening-and-closing part. Therefore, it is possible to prevent the sheet-like member from being damaged.

  The automatic document feeder preferably has the following configuration. In other words, the automatic document feeder includes a discharge roller that can discharge a document transported along the document transport path to the outside. The rotation axis of the opening / closing shaft and the rotation axis of the discharge roller are the same.

  Thereby, since the rotation shaft of the opening / closing part and the discharge roller can be made common, the number of parts can be reduced, and the automatic document feeder can be reduced in cost.

  According to a second aspect of the present invention, there is provided a document reading apparatus including the automatic document feeder.

  As a result, it is possible to realize a document reading apparatus that can prevent an excessive force from being applied to the sheet-like member even when the opening / closing portion is opened to eliminate jamming or the like.

1 is an external perspective view of a multifunction peripheral according to an embodiment of the present invention. FIG. 3 is a front cross-sectional view showing the configuration of the image scanner device. The schematic diagram explaining the introduction path | route and the discharge path for single sides | surfaces. The schematic diagram explaining a 1st inversion path | route. The schematic diagram explaining a 2nd inversion path | route. The schematic diagram explaining the discharge path for both surfaces. The front view which shows the structure of the opening-and-closing guide vicinity when an opening-and-closing guide is closed. The front view which shows the structure of the opening-and-closing guide vicinity when the opening-and-closing guide is open | released.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a multifunction machine 1 according to an embodiment of the present invention.

  The multifunction device 1 has a copy function and a facsimile function, and an image scanner device (document reading device) 11 that functions as a book scanner and an auto document feed scanner is provided on the upper portion of the multifunction device 1. The multifunction machine 1 also includes an operation panel 12 for instructing the number of copies, a facsimile transmission destination, a document reading, and the like.

  The multifunction device 1 further includes a multifunction device main body 13 including an image forming unit that forms an image on a sheet as a recording medium, and a sheet feeding cassette 14 that sequentially supplies the sheet. The multifunction machine main body 13 includes a transmission / reception unit (not shown) for transmitting image information via a communication line.

  Next, the image scanner device 11 provided in the multifunction machine 1 will be described with reference to FIG. FIG. 2 is a front sectional view showing the configuration of the image scanner device 11. The front view in the present embodiment can also be expressed as a view seen in the width direction of the conveyed document.

  As shown in FIG. 2, the image scanner device 11 includes a document table cover 21, a platen glass 22, and a contact glass 23. The document table cover 21 is provided with an automatic document feeder (auto document feeder, ADF) 24. Further, the image scanner device 11 includes a scanner unit 25 for reading image information of the original 100 below the platen glass 22 and the contact glass 23.

  The scanner unit 25 includes a carriage 110 that can move in the left-right direction inside the document table. In the carriage 110, a light source 111, a plurality of reflecting mirrors 112, a condenser lens 113, and a charge coupled device (CCD) 114 are arranged. The light source 111 irradiates the read original with light, and the reflected light from the read original is reflected by a plurality of reflecting mirrors 112 and then converges through the condenser lens 113 to form an image on the surface of the CCD 114. Then, the CCD 114 converts the incident convergent light into an electrical signal and outputs it.

  Further, as shown in FIG. 2, the ADF 24 provided in the document table cover 21 includes a paper feed tray 52 provided above the document table cover 21 and a paper discharge tray provided below the paper feed tray 52. 53. A document transport path 40 that connects the paper feed tray 52 and the paper discharge tray 53 is formed inside the ADF 24.

  When the user operates the operation panel 12 shown in FIG. 1 to instruct to use the image scanner device 11 as an auto document feed scanner, the original 100 set on the paper feed tray 52 is placed on the original conveyance path 40. It is conveyed one by one along. Then, when the document 100 transported along the document transport path 40 passes through the glass surface (reading position) of the contact glass 23, the image information of the document 100 is read by the scanner unit 25. Thereafter, the document 100 is transported along the document transport path 40 and is discharged to the paper discharge tray 53.

  On the other hand, when the image scanner device 11 is used as a book scanner, the user places a book document to be read on the platen glass 22. Then, the book document is pressed from above by a platen sheet (sheet-like member) 51 disposed at the lower part of the ADF 24 and fixed so as not to move. In this state, the scanner unit 25 performs reading while moving in the left-right direction, whereby the image information of the book document is read.

  Next, the internal configuration of the ADF 24 will be described in detail. In the following description, when viewed from the front, the side with the paper feed tray 52 may be simply referred to as “right side”, and the opposite side in front view may be simply referred to as “left side”.

  In the ADF 24 according to the present embodiment, the path through which the document 100 is conveyed differs when reading only one side (first surface) of the document 100 and when reading both surfaces (first surface and second surface) of the document 100. It is configured as follows. First, a path for reading only one side of the document 100 and members arranged in the path will be described with reference to FIGS. FIG. 3 is a schematic diagram illustrating the introduction path 41 and the single-side discharge path 43.

  When only one side of the original 100 is read, as shown in FIG. 3, an introduction path 41 for guiding the original 100 to the reading position and a single-sided discharge for guiding the original 100 from the reading position to the paper discharge tray 53. The document 100 is conveyed along the path 43.

  In the introduction path 41, a pickup roller 30, a separation roller 31, a registration roller 32, a triple roller 33, and a conveyance roller 34 are arranged in order from the upstream side. Below, the structure of each part arrange | positioned on the path | route of the introductory path | route 41 is demonstrated from the upstream to the downstream order.

  A pickup roller 30 and a separation roller 31 are disposed in the vicinity of the upstream end of the introduction path 41. The pickup roller 30 is configured to be rotatable around the rotation axis of the separation roller 31. When the ADF 24 is not operating, the pickup roller 30 is held on the upper side in FIG. On the other hand, when the original 100 is fed, the pickup roller 30 rotates downward and comes into contact with the end of the original 100 on the uppermost layer of the originals 100 set on the paper feed tray 52. When the pickup roller 30 rotates in this state, the uppermost document 100 on the paper feed tray 52 is conveyed to the separation roller 31.

  The document 100 sent to the separation roller 31 by the drive of the pickup roller 30 is separated one by one by the rotationally driven separation roller 31 and then conveyed to a registration roller 32 disposed on the downstream side.

  The registration roller 32, together with the opposing roller, temporarily stops and loosens the leading edge of the document 100 being conveyed, and conveys it downstream while removing the slackness after a predetermined time. Thereby, the skew of the document 100 is corrected. The document 100 that has passed the registration roller 32 is conveyed to a triple roller 33 disposed on the downstream side.

  The introduction path 41 from the separation roller 31 to the slightly upstream side of the triple roller 33 is a linear path.

  The triple roller 33 includes a driving roller 331 disposed at the center and driven rollers 332 and 333 disposed vertically so as to sandwich the driving roller 331 therebetween. The document 100 conveyed along the introduction path 41 passes between the driving roller 331 and the driven roller 332 disposed above the driving roller 331 and is conveyed obliquely to the lower left. The document 100 that has passed through the triple roller 33 is conveyed to a conveyance roller 34 disposed on the downstream side. The driven roller 333 disposed below the driving roller 331 has a rotation direction opposite to that of the driven roller 332, and conveys the document 100 passing between the driving roller 331 and the driven roller 333 to the right side. Can do.

  The conveyance roller 34 nips and rotates the original 100 together with the opposite roller, thereby conveying the original 100 to the lower right side (reading position side). Then, when the document 100 passes through the reading position, the image information on the first surface is read by the scanner unit 25. The conveyance roller 34 is configured to be able to switch the rotation direction. By rotating in the reverse direction, the document 100 can be conveyed to the upper left side (the triple roller 33 side).

  The introduction path 41 from the slightly upstream side of the triple roller 33 to the reading position is a path (introduction curve path 411 shown in FIG. 3) that swells to the left side (curves so as to be convex on the left side). .

  Next, the single-sided discharge path 43 will be described. A triple roller 35, a transport roller 36, a common roller (discharge roller) 38, and a counter roller 39 are arranged in order from the upstream side in the single-side discharge path 43. Below, the structure of each part arrange | positioned on the path | route of the single-sided discharge path | route 43 is demonstrated in order of the downstream from an upstream.

  There is a portion that branches vertically on the slightly downstream side of the reading position, and a triple roller 35 is disposed in the vicinity of the branched portion. The triple roller 35 includes a registration roller 351 disposed at the center, and driven rollers 352 and 353 disposed above and below so as to sandwich the registration roller 351 therebetween. The document 100 whose image information has been read by the scanner unit 25 passes between the registration roller 351 and the driven roller 352 disposed above the registration roller 351 and is conveyed obliquely to the upper right. The document 100 that has passed through the triple roller 35 is conveyed to a common roller 38 that is positioned diagonally to the lower right of the conveyance roller 36 by a conveyance roller 36 disposed on the downstream side. The registration roller 351 has the same configuration as that of the registration roller 32. The registration roller 351 is inclined obliquely to the lower left side between the registration roller 351 and the driven roller 353 disposed below the registration roller 351. The line can be corrected.

  The common roller 38 nips and rotates the original 100 together with the opposing roller 39 disposed so as to face the original roller 100, thereby conveying the original 100 to the right side and discharging it to the paper discharge tray 53. As described above, image information on only one side of the original 100 set on the paper feed tray 52 is read. The common roller 38 is configured to be able to switch the rotation direction, and can rotate the document 100 to the left side (reading position side) by rotating in the opposite direction to when the document 100 is discharged.

  Next, a path for reading both sides of the document 100 will be described with reference to FIGS. 2 and 4 to 6. FIG. 4 is a schematic diagram for explaining the first inversion path 45. FIG. 5 is a schematic diagram for explaining the second inversion path 46. FIG. 6 is a schematic diagram for explaining the discharge path 47 for both sides.

  When reading both sides of the original 100, the original set on the paper feed tray 52 is conveyed to the reading position along the introduction path 41, as in the case of reading only one side of the original 100. Then, the image information on the first surface of the document 100 is read by the scanner unit 25. Further, the ADF 24 of the present embodiment is configured to be able to detect the length of the document 100 in the conveyance direction (document length), and operates a route guide or the like (not shown) based on the detected document length. Thus, the path through which the document 100 is conveyed next to the introduction path 41 can be switched.

  First, a path along which the document 100 is conveyed when the document length is short will be described. The document 100 in this case is configured to be conveyed along the first reversing path 45 shown in FIG. 4 after being conveyed along the introduction path 41 to the reading position. The first inversion path 45 includes, in order from the upstream side, a first pre-inversion path 451, a first inversion middle path 452, and a first post-inversion path 453.

  In the first pre-reversal path 451, a triple roller 35 and a transport roller 36 are arranged in order from the upstream side. Similar to the single-side discharge path 43, the document 100 conveyed along the first pre-reversal path 451 passes between the registration roller 351 and the driven roller 352 disposed thereabove and is conveyed diagonally to the upper right. Is done. Then, the document 100 is conveyed rightward by the conveyance roller 36 and conveyed to the first reverse path 452.

  The first inversion middle path 452 guides the document 100 obliquely downward to the right as in the case of the single-side discharge path 43 until halfway. However, after the branch point in the middle, the document 100 is guided so as to be conveyed obliquely downward to the left. This first inversion middle path 452 is a path that swells to the right (curves so as to be convex to the right). By being conveyed along this first reversing path 452, the front and back sides of the document 100 are reversed. That is, after the first surface facing the lower side (scanner unit 25 side) before being transported along the first reversing path 452 is transported along the first reversing path 452, Turn to face. Then, the document 100 conveyed along the first reversing path 452 is conveyed to the first reversing path 453.

  A conveyance roller 37 and a triple roller 35 are arranged in order from the upstream side in the first reverse path 453. The document 100 transported along the first reverse path 453 is transported to the left by the transport roller 37, and after the skew is corrected by the registration roller 351 of the triple roller 35, the document 100 passes through the reading position. In this way, the original 100 when the original length is short is reversed.

  Next, a path for reversing the document 100 when the document length is long will be described. Here, the case where the document length is long means that the document length is equal to the length of the first inversion path 45 or the document length is longer. If the document 100 having a long document length is conveyed along the first reversing path 45, the leading end of the document 100 after reversing the reading position with the trailing edge of the document 100 still remaining at the reading position. Since they are going to pass, the originals 100 overlap and cause a paper jam. Therefore, as shown in FIG. 5, the second inversion path 46 through which the document 100 passes when the document length is long is configured to be longer than the first inversion path 45.

  The second inversion path 46 includes a second pre-inversion path 461, a second inversion middle path 462, and a second post-inversion path 463. The second pre-inversion path 461 extends further to the right than the first pre-inversion path 451. Similar to the first inversion middle path 452, the second inversion middle path 462 has a path swelled to the right side (curved so as to be convex on the right side). The second post-inversion path 463 extends further to the right than the first post-inversion path 453.

  The second reverse path 463 passes through the common roller 38 when the document 100 is conveyed to the left side. However, as described above, the common roller 38 can be switched in the rotation direction, so that the common roller 38 is conveyed to the left side. can do. Thus, the common roller 38 has a function as a discharge roller and a function as a transport roller. In this way, the document 100 when the document length is long is reversed.

  Then, the original 100 which has been reversed by the first reversing path 45 or the second reversing path 46 and whose image information on the second surface has been read is conveyed to the duplex discharge path 47 shown in FIG.

  The document 100 conveyed along the duplex discharge path 47 passes through the reading position to the left side, and is then conveyed to the upper left side by the conveyance roller 34. Then, the document 100 passes between the driving roller 331 and the driven roller 333 disposed below the driving roller 331 and is conveyed rightward.

  Note that the duplex discharge path 47 from the reading position to the triple roller 33 is a path (a curved discharge path 471 shown in FIG. 6) that bulges to the left (curves so as to be convex on the left). Note that, in the original 100 conveyed along the introduction curved path 411 and the original 100 conveyed along the discharge curved path 471, the conveyance directions of the original 100 are opposite to each other. In this respect, the conveyance roller 34 of the present embodiment can switch the rotation direction, and further, the rotation directions of the driven roller 332 and the driven roller 333 are opposite to each other.

  Then, the document 100 conveyed along the duplex discharge path 47 and passed through the triple roller 33 is conveyed in the right direction, and after passing through the conveyance roller 36, is conveyed obliquely downward to the right. Then, similarly to the original 100 conveyed along the single-sided discharge path 43, it is discharged to the discharge tray 53 by the common roller 38 and the counter roller 39. Note that the double-side discharge path 47 from the branch point slightly downstream of the transport roller 36 to the branch point slightly upstream of the common roller 38 connects the second pre-reverse path 461 and the second post-reverse path 463 ( Connection path 472 shown in FIG. As described above, the image information on both sides of the original 100 set on the paper feed tray 52 is read.

  Next, a configuration for easily removing a jammed document when a document jam occurs in the ADF 24 will be described with reference to FIGS. FIG. 7 is a front view showing a configuration in the vicinity of the opening / closing guide 81 when the opening / closing guide 81 is closed. FIG. 8 is a front view showing a configuration in the vicinity of the opening / closing guide 81 when the opening / closing guide 81 is open.

  When the document 100 is being transported by the ADF 24, the document may be jammed for some reason. In order to eliminate the document jam, it is necessary to remove the jammed document that causes the document jam.

  The ADF 24 of the present embodiment is configured such that the lower part of the ADF 24 is opened to remove the jammed original (see FIGS. 7 and 8), and the original conveyance path 40 can be exposed. Then, by removing the jammed document from the document transport path 40 and closing the lower part of the ADF 24, the reading operation of the document 100 can be resumed.

  Here, when the lower portion of the ADF 24 is opened, a part of the platen sheet 51 attached to the lower surface of the document table cover 21 is also deformed accordingly. The ADF 24 according to the present embodiment can open the lower portion of the ADF 24 without applying an excessive force to the platen sheet 51. Hereinafter, a configuration in which the lower part of the ADF 24 is opened will be described.

  At the bottom of the ADF 24, an opening / closing guide (opening / closing part) 81 that can be rotated about an opening / closing shaft 82, and a sheet sticking plate (fixing part) 85 whose position does not change before and after the opening / closing guide 81 rotates. , Is arranged. Note that the center line of the opening / closing shaft 82 coincides with the center line of the rotation shaft of the common roller 38. The front views shown in FIGS. 2 to 8 can be said to be views seen in the width direction of the document 100 being conveyed, and can be expressed as views seen in the axial direction of the opening / closing shaft 82. You can also.

  The open / close guide 81 can guide the document 100 at its upper end surface, and constitutes a part of the document transport path 40. Then, the document guide path 40 can be exposed by rotating the open / close guide 81 to open the lower part of the ADF 24.

  The open / close guide 81 includes a guide body 86, a slide member 83, and a restriction pin 811. The guide main body 86 is rotatably attached to the opening / closing shaft 82, whereby the entire opening / closing guide 81 can be rotated as described above. The slide member 83 is disposed below the guide body 86 and can be slid in a direction perpendicular to the opening / closing shaft 82.

  In addition, a long hole (regulation hole) 832 for guiding the direction of movement of the slide member 83 is formed in the slide member 83 in the left-right direction (direction perpendicular to the opening / closing shaft 82) in FIG. On the other hand, the restriction pin 811 is fixed to the guide body 86 in a state parallel to the opening / closing shaft 82. Then, when the restriction pin 811 is inserted into the elongated hole 831, the slide member 83 is slidably attached to the guide body 86.

  A flat attachment surface (slide surface) 835 is formed on the lower surface of the slide member 83, and the platen sheet 51 is fixed to the attachment surface 835 by appropriate means such as a double-sided tape. The mounting surface 835 moves integrally with the slide member 83 as the slide member 83 slides. The platen sheet 51 is not particularly fixed to the open / close guide 81 except for the mounting surface 835 of the slide member 83. Therefore, for example, the platen sheet 51 facing the free end side of the guide main body 86 is free (not restrained), but the platen sheet 51 itself is made of a stiff material. The end of the wing does not turn or bend.

  The sheet affixing plate 85 is located below the ADF 24 (below the sheet discharge tray 53 and below the document table cover 21), and a flat sheet fixing for fixing the platen sheet 51 to the lower surface thereof. A surface (fixed surface) 855 is formed. The seat fixing surface 855 is located on the same plane as the mounting surface 835 of the slide member 83 in a state where the open / close guide 81 is closed (see FIG. 7). 7 and 8, a double-sided tape is attached to the application position surrounded by a chain line in FIG. 7 and FIG. 8, and the platen sheet 51 is fixed to the sheet fixing surface 855 by this double-sided tape. . This pasting position is in the vicinity of the end closest to the slide member 83 in the sheet fixing surface 855, but the platen sheet 51 is fixed to the sheet pasting plate 85 at an appropriate position even outside this pasting position. Is done.

  With the above configuration, when the opening / closing guide 81 is opened to remove the jammed document, the sheet pasting plate 85 and the opening / closing guide 81 (guide body 86) are in a positional relationship such that they are bent with the opening / closing shaft 82 as a boundary. Since the platen sheet 51 is disposed below (bent inside) the opening / closing shaft 82, the opening / closing guide 81 is opened, so that a portion of the platen sheet 51 near the opening / closing shaft 82 has a compression direction. Power is added. However, in this embodiment, since the platen sheet 51 is fixed to the slide member 83 instead of the guide main body 86, the slide member 83 moves away from the opening / closing shaft 82 as shown in FIG. ) By sliding, it is possible to release such a force in the compression direction. As described above, since the displacement of the positional relationship between the platen sheet 51 and the guide main body 86 can be absorbed by the movement of the slide member 83, an excessive force acts on the platen sheet 51 in a portion near the opening / closing shaft 82 (bending boundary). This can be avoided, and plastic deformation and breakage of the platen sheet 51 can be prevented.

  Further, since the position (sticking position) for fixing the platen sheet 51 to the sheet fixing surface 855 is in the vicinity of the opening / closing shaft 82, the platen sheet 51 does not separate from the sheet fixing surface 855 when the opening / closing guide 81 is rotated. Accordingly, the state in which the platen sheet 51 is along the lower surfaces of the open / close guide 81 and the sheet sticking plate 85 can be maintained.

  The slide movement range of the slide member 83 is determined by the length of the long hole 831 and the like. FIG. 7 shows a state in which the slide member 83 is moved closest to the opening / closing shaft 82. In FIG. 7, a virtual perpendicular drawn from the center of the opening / closing shaft 82 toward the platen sheet 51 is indicated by reference numeral 88. As shown in FIG. 7, when the slide member 83 is moved to the position closest to the opening / closing shaft 82, the end portion of the slide member 83 closest to the opening / closing shaft 82 is on the left side of the drawing with respect to the virtual perpendicular 88 ( The slide range and the size of the slide member 83 are set so as to be positioned on the free end side of the guide body 86. Therefore, it is possible to always ensure that the portion corresponding to the opening / closing shaft 82 in the platen sheet 51 is not restrained by the slide member 83. Therefore, when the opening / closing guide 81 is opened as shown in FIG. Can be bent without difficulty.

  The user opens the open / close guide 81 as described above, removes the jammed document, and then closes the open / close guide 81 again. As a result, the bending of the platen sheet 51 is restored, but the slide member 83 simultaneously moves toward the opening / closing shaft 82, thereby absorbing the positional relationship between the end of the platen sheet 51 and the guide body 86. To do. Thereby, the operation | work which closes the opening-and-closing guide 81 can be performed smoothly.

  As described above, by moving the slide member 83 in conjunction with opening / closing of the opening / closing guide 81, the platen sheet 51 is prevented from being greatly deformed locally, and the opening / closing guide 81 can be smoothly opened and closed. Can be realized.

  As described above, the ADF 24 of the present embodiment includes the opening / closing shaft 82, the opening / closing guide 81, the document conveyance path 40, the sheet sticking plate 85, and the platen sheet 51. The open / close guide 81 has a slide member 83 that can slide in a direction toward and away from the open / close shaft 82, and can be opened / closed by rotating about the open / close shaft 82. The document transport path 40 is a path for transporting the document 100 and is exposed when the open / close guide 81 is opened. The sheet sticking plate 85 has a sheet fixing surface 855. The platen sheet 51 has flexibility, and is affixed to the vicinity of the opening / closing shaft 82 of the sheet fixing surface 855 and the attachment surface 835 of the slide member 83.

  As a result, when the opening / closing guide 81 is opened in order to eliminate the document jam, the platen sheet 51 slides together with the slide member 83, so that an unreasonable force is applied to the platen sheet 51 (particularly, near the opening / closing shaft 82). This can be prevented with a compact configuration. Further, when the opening / closing guide 81 is opened, the platen sheet 51 bends while maintaining the state along the opening / closing guide 81 and the sheet sticking plate 85, so that a conveyance roller (for example, disposed inside the platen sheet 51 (for example, It is possible to prevent dust and the like from being mixed into a gear or the like for driving the upper common roller 38) of the platen sheet 51.

  In the ADF 24 of the present embodiment, the opening / closing guide 81 includes a regulation pin 811. Further, a long hole 831 is formed in the slide member 83. Then, when the restriction pin 811 is inserted into the long hole 831, the slide range of the slide member 83 is restricted.

  Thereby, the slide member 83 can be prevented from sliding beyond a necessary range, and therefore, an excessive force can be prevented from being applied to the slide member 83 and the platen sheet 51. Therefore, the slide member 83 and the platen sheet 51 can be prevented from being damaged.

  Further, in the ADF 24 of the present embodiment, when viewed in the axial direction of the opening / closing shaft 82, the virtual perpendicular 88 lowered from the opening / closing shaft 82 to the platen sheet 51 is more than the end of the slide member 83 on the sheet sticking plate 85 side. , The sheet sticking plate 85 side.

  Thereby, it is possible to prevent the platen sheet 51 between the slide member 83 and the sheet sticking plate 85 from being largely deformed locally by opening and closing the opening / closing guide 81. Therefore, the platen sheet 51 can be prevented from being damaged.

  In addition, the ADF 24 of the present embodiment includes a common roller 38 that can discharge the document 100 conveyed through the document conveyance path 40 to the outside. The rotation axis of the opening / closing shaft 82 and the rotation axis of the common roller 38 are the same.

  Thereby, since the rotation shafts of the open / close guide 81 and the common roller 38 can be made common, the number of parts can be reduced and the ADF 24 can be reduced in cost.

  The preferred embodiment of the present invention has been described above, but the above configuration can be modified as follows, for example.

  In the above embodiment, the attachment surface 835 and the sheet fixing surface 855 are located on the same plane, but they need not be located on the same plane. That is, when the heights at which the attachment surface 835 and the sheet fixing surface 855 are different are different, the thickness of the platen sheet 51 is partially varied so as to correspond to this height, thereby exhibiting the effect of the present invention. it can. Even when at least one of the mounting surface 835 and the sheet fixing surface 855 is inclined, the effect of the present invention can be exhibited by using the platen sheet 51 having a corresponding shape. However, the surface of the platen sheet 51 that comes into contact with the book document or the like needs to be flat (one plane).

  In the above embodiment, the guide main body 86 includes the restriction pin 811 and the long hole 831 is formed in the slide member 83. Instead, the long hole is formed in the guide main body 86, and the slide member 83 is the restriction pin. You may make it the structure provided with.

  Instead of the scanner unit 25 of the reduction optical system used in the above embodiment, a configuration using a contact image sensor or the like can be used.

  In the above-described embodiment, the image scanner device 11 is provided as a part of the multifunction device 1. However, instead of this configuration, the image scanner device 11 can be configured as a single image scanner device.

1 MFP 11 Image Scanner Device (Document Reading Device)
24 ADF (Automatic Document Feeder)
40 Document transport path 51 Platen sheet (sheet-like member)
81 Opening and closing guide (opening and closing part)
82 Opening and closing shaft 83 Slide member 85 Sheet sticking plate (fixed part)
88 Virtual perpendicular 835 Mounting surface (sliding surface)
855 Seat fixing surface (fixing surface)

Claims (5)

An opening and closing shaft;
An open / close section that has a slide member that can slide in a direction approaching and leaving the open / close shaft, and that can be opened / closed by rotating about the open / close shaft;
A path for transporting a document, the document transport path exposed when the opening / closing portion is opened, and
A fixing part having a fixing surface;
A sheet-like member that has flexibility and is attached to the slide surface of the slide member and the vicinity of the opening / closing axis of the fixed surface;
An automatic document feeder characterized by comprising: The automatic document feeder according to claim 1,
One of the opening / closing part and the slide member includes a regulation pin,
A restriction hole is formed in the other of the opening / closing part and the slide member,
An automatic document feeder, wherein a slide range of the slide member is restricted by inserting the restriction pin into the restriction hole. The automatic document feeder according to claim 1 or 2,
When viewed in the axial direction of the opening / closing shaft, a virtual perpendicular dropped from the opening / closing shaft to the sheet-like member is closer to the fixed portion than an end portion on the fixed portion side of the slide member. Automatic document feeder. An automatic document feeder according to any one of claims 1 to 3,
A discharge roller capable of discharging the document transported along the document transport path to the outside;
An automatic document feeder, wherein the rotation axis of the opening / closing shaft and the rotation axis of the discharge roller are the same.   An original reading apparatus comprising the automatic document feeder according to any one of claims 1 to 4.

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