JP3797358B2 - Image reading device - Google Patents

Description

  The present invention relates to an image reading apparatus such as a scanner, a facsimile machine, and a copying machine, which is equipped with an automatic document transport mechanism and has a document pressing plate that can be opened and closed with respect to a document reading surface of the apparatus body.

  2. Description of the Related Art Image reading apparatuses such as scanners, facsimiles, and copiers are provided with a flat bed scanner (hereinafter referred to as “FBS”) in the apparatus body, and a plurality of document pressing plates that can be opened and closed with respect to the upper surface of the apparatus body. Some of them are equipped with an automatic document feeder such as an auto document feeder (hereinafter referred to as “ADF”) that sequentially feeds documents. FIG. 17 shows a conventional copy / facsimile multifunction peripheral 900 equipped with an ADF. The copy / facsimile multifunction peripheral 900 includes a reading platen glass 901 on which a document to be read is placed as shown in FIG. Although not shown in the drawing, the main body of the copy / facsimile multifunction peripheral 900 includes a recording sheet, which includes a mounting table 902 and a document pressing plate 903 that presses and fixes the document onto the platen glass 901. Are provided with an image recording unit for recording an image, a transmission unit for transmitting the image, a paper feed cassette for supplying a recording sheet for recording the read image, and the like.

  When reading a document using the copy / facsimile multifunction device 900 as an FBS, the document pressing plate 903 is opened, a document such as a document is placed on the platen glass 901 of the reading table 902, the document pressing plate 903 is closed, The original is scanned to read an image. On the other hand, when the document is read by the ADF provided on the document pressing plate 903, the ADF continuously and automatically feeds a plurality of sheet-like documents placed on the document tray 904 one by one to the conveyance path 905. Then, the image of the original conveyed at the reading position P1 is read, and the original after reading the image is discharged to the discharge tray 906.

  The conveyance path 905 is formed in a lateral U shape with the inner guide surface 905a and the outer guide surface 905b facing each other, the inner guide surface 905a is constituted by a guide member 906, and the outer guide surface 905b is a document. The pressing plate 902 includes a main body frame 907 and an upper cover 908. In the conveyance path 905, conveyance rollers 909a and 909b and a driven roller 910 for conveying a document are arranged in a nipped state. Conveying rollers 909a and 909b that are rotated by driving transmission from a driving source such as a motor are respectively supported by the guide member 906 and partially protrude from the inner guide surface 905a. The driven roller 910 includes the main body frame 907 and The upper cover 908 protrudes from the outer guide surface 905b by being rotatably supported by the upper cover 908 and being urged toward the transport rollers 909a and 909b. A guide member 906 that pivotally supports each of the conveying rollers 909a and 909b is fixed to the main body frame 907, whereby the conveying rollers 909a and 909b and the driven roller 910 are in pressure contact with each other in the nip state, and the document is nipped in the conveying path 905. And is designed to be transported.

  By the way, in the ADF, a paper jam (jam) may occur in the document, and it is necessary to open the nip between the conveying rollers 909a and 909b and the driven roller 910 in order to eliminate the jam. The nip between the conveying roller 909a and the driven roller 910 disposed on the upper side of the guide member 906 is opened by opening the upper cover 908 as shown in the figure (see, for example, Patent Document 1 and Patent Document 2). On the other hand, the nip between the conveying roller 909b and the driven roller 910 disposed below the guide member 906 and immediately upstream and downstream of the reading position P1 can be opened because the guide member 906 is fixed. Impossible. Therefore, when the upper cover 908 is opened, the drive roller 909b drive transmission is cut by the electromagnetic clutch so that the transport roller 909b is in a free rotating state, and the jam is eliminated by pulling out the document from the upstream side or the downstream side of the transport roller 909b. It can be done.

Further, as a large number of originals are conveyed by the ADF, foreign matters such as unfixed toner, vermilion, writing instrument debris, and paper dust adhere to the conveying surfaces of the conveying rollers 909a and 909b and the driven roller 910. . Foreign matter adhering to the conveying rollers 909a and 909b and the driven roller 910 upstream of the reading position P1 is carried to the reading position P1 by the subsequent document and adheres to the platen glass 901. As a result, black streaks or the like appear in the read image. The problem of appearing arises. In addition, when foreign matter adheres to the transport roller 909b and the driven roller 910 on the downstream side of the reading position P1, the document transported by the transport roller 909b and the driven roller 910 is slipped to affect the transport speed, thereby affecting the read image. The problem arises that distortion occurs. Furthermore, when a CIS reading unit 911 that reads an image on the back side of the document is provided downstream of the reading position P1, foreign matter adhering to the conveying roller 909b and the driven roller 910 on the downstream side of the reading position P1 is Then, it is carried by the subsequent document and adheres to the CIS reading unit 911 and the platen roller 912, resulting in a problem that black streaks appear on the read image on the back surface.
Japanese Patent Laid-Open No. 11-106086 JP 7-323626 A

  In order to prevent or eliminate the above-described problems, it is necessary to clean the transport surfaces of the transport rollers 909a and 909b and the driven roller 910 with a cloth soaked with a cleaning liquid. The conveying roller 909a and the driven roller 910 arranged on the upper side of the guide member 906 are configured so that the conveying roller 909a and the driven roller 910 are opened by opening the upper cover 908 with the document pressing plate 903 closed with respect to the reading table 902. Since it is exposed and the nip is released, cleaning can be performed easily. Further, the conveying roller 909a to which the drive is transmitted can be easily cleaned on the entire circumference of the conveying surface without cutting the drive transmission by rotating at a low speed suitable for cleaning.

  However, as described above, the guide member 906 is fixed at the nip between the conveying roller 909b and the driven roller 910 disposed below the guide member 906 and immediately upstream and downstream of the reading position P1. It is impossible to open it. The driven roller 910 disposed on the main body frame 907 side can be accessed from the lower side of the main body frame 907 with the document pressing plate 903 opened with respect to the reading table 902, but the guide member 906 is accessed. The support roller 909b supported by the shaft is difficult to access from the upper side or the lower side of the document pressing plate 903. To clean the transfer roller 909b, a tool such as a screwdriver is used to clean the transfer roller 909b. It was necessary to remove the guide member 906, which was a very troublesome operation.

  The present invention has been made in view of the above-described circumstances and problems. In an image reading apparatus equipped with an automatic document conveyance mechanism, the document reading position can be adjusted without removing the guide member from the document pressing plate using a tool or the like. It is an object of the present invention to provide means capable of easily cleaning the transport rollers disposed immediately upstream and downstream.

  In order to achieve the object, an image reading apparatus according to claim 1 is provided with a document pressing plate that can be opened and closed with respect to a document reading surface of an apparatus body provided with an image reading unit. A horizontal U-shaped conveyance path that communicates from the document tray to the paper discharge tray, a conveyance roller that is arranged in the conveyance path and conveys the document, and is formed at a position facing the document reading surface of the conveyance path. In an image reading apparatus equipped with an automatic document transport mechanism having a document reading opening, the guide reading member is fixed to the document pressing plate and constitutes an inner guide surface of the transport path. A first conveyance roller immediately upstream and a second conveyance roller immediately downstream are pivotally supported, and an access portion that exposes the first conveyance roller and the second conveyance roller through the document reading opening is recessedly provided in the guide member. Cover the access section Access cover constituting the inner guide surface together with the guide member Te, characterized in that provided detachably on the guide member through the document reading opening.

  The image reading apparatus according to claim 2, wherein a second image reading unit is disposed in a conveyance path downstream of the document reading opening of the document pressing plate, and the second conveyance roller is configured to read the second image reading device. 2. The image reading apparatus according to claim 1, wherein the access unit cover corresponds to a guide cover that covers the second transport roller side of the access unit and a document reading opening of the access unit. And a platen guide that covers a portion to be covered.

  The image reading apparatus according to claim 3, wherein the platen guide is pivotally supported by the guide member so that one end side in the document conveyance direction is swingable, and is elastic between the guide member. The swing limit to the document reading opening side is regulated by the member being urged toward the document reading opening side and the locking piece projecting on the other end side locking with the guide member. It is characterized by.

  According to the image reading apparatus of the first aspect, the access portion is recessed in the guide member fixed to the document pressing plate, so that the first transport roller immediately upstream of the document reading opening and the first downstream of the document reading opening. Since the two conveying rollers are exposed through the document reading opening, the first conveying roller and the second conveying roller can be cleaned from the lower side of the document pressing plate through the document reading opening.

  The exposure of the first transport roller and the second transport roller can be easily performed by removing the access unit cover from the document reading opening with the document pressing plate opened, and the configuration is simple.

  According to the image reading apparatus of the second aspect, the second image reading unit is disposed in the conveyance path on the downstream side of the document reading opening of the document pressing plate, so that the second conveyance roller reads the document. It is also possible to deal with the case where the access portion cover is disposed downstream of the opening for use in the document, and the access portion cover is divided into the guide cover and the platen guide, so that the attachment / detachment work from the document reading opening is facilitated. .

  According to the image reading apparatus of the third aspect, the platen guide can be reliably attached to and detached from the guide member with a simple configuration. Furthermore, when the original pressing plate is closed, the position of the original conveyed from the original reading opening to the original reading surface can be kept constant, and the read image quality is stabilized.

  FIG. 1 is a diagram showing a cross section of an upper part of a copy / facsimile multifunction peripheral 100 which is an image reading apparatus according to an embodiment of the present invention. As shown in the figure, the copier / facsimile multifunction peripheral 100 is equipped with a reading table (apparatus main body) 101 having a function as an FBS and an ADF 1 as an automatic document conveying mechanism. As shown in FIG. The document pressing plate 102 is provided so as to be openable and closable via a hinge member 90 with respect to the upper surface of the table 101. As shown in FIG. 1, the reading table 101 reads the surface of a document on the upper surface of a substantially rectangular parallelepiped housing 10 with a platen glass 11 serving as a document reading surface when the document is read by the FBS, and the ADF 1. A platen glass 12 serving as an original reading surface is provided, and a CCD reading unit 13 (image reading means) for reading an image of the original is built in the housing 10.

  In order to read a document by FBS using the copy / facsimile multifunction peripheral 100, the document pressing plate 102 is opened, a document such as a document is placed on the platen glass 11 of the reading table 101, and the document pressing plate 102 is used. The image is read by scanning the CCD reading unit 13 on the original. On the other hand, in order to read the surface of the document with the ADF 1, when the document conveyed one by one by the ADF 1 passes over the platen glass 12 of the reading table 101 at the reading position P1, it is below the platen glass 12. Image reading is performed by the moved CCD reading unit 13.

  As shown in FIG. 2, the reading table 101 is configured such that the operation panel 103 for inputting the reading start of the document or the like, and whether the document pressing plate 102 is in contact with the upper surface of the reading table 101. An open / close sensor 104 which is a contact sensor for detecting the open / close state of the pressing plate 102 is provided. The open / close sensor 104 may be provided on the document pressing plate 102 or may be a magnetic sensor that detects the magnetism of a magnet provided on the document pressing plate 102. Although not shown, the copy / facsimile multifunction peripheral 100 is further provided with an image recording unit for recording an image on a recording sheet, a transmission unit for transmitting the image, and a recording sheet for recording the read image. In addition, a known configuration such as a sheet feeding cassette is also provided, and these known configurations are examples and arbitrary.

  The CCD reading unit 13 includes a light source for irradiating light to a reading position, a plurality of reflecting mirrors for guiding reflected light from a document in a predetermined direction, a condensing lens 14 for converging the reflected light, and the converged light. This is a reading unit of a so-called reduction optical system including a charge coupled device (hereinafter referred to as “CCD”) 15 that converts and outputs an electric signal. The light source and some of the reflecting mirrors are platen by a driving mechanism. A scanning unit 16 that reciprocates horizontally with respect to the glass 11 is provided. When the CCD reading unit 13 configured as described above reads an original with the FBS, the scanning unit 16 scans the original on the platen glass 11 while moving horizontally with respect to the platen glass 11, and reflects from the original. The light is guided to the CCD 15 to form an image. Further, when the original is read by the ADF 1, the scanning unit 16 moves below the platen glass 12, scans the image of the original passing through the reading position P 1 by the ADF 1, and guides reflected light from the original to the CCD 15. Form an image. Although not shown in the figure, the image signal read by the CCD reading unit 13 and converted into an electric signal is subjected to analog / digital conversion, shading processing, etc., and then recorded by an image recording unit such as a printer. It is recorded on paper or transmitted by a transmission unit such as CODEC.

  As shown in FIG. 2, the document pressing plate 102 can be opened and closed with respect to the upper surface of the reading table 101 by a hinge member 90 or the like. As shown in FIG. The ADF 1 is installed in a space formed by an ADF cover 102b that can be opened and closed with respect to the 102a.

  The ADF 1 carries a plurality of documents in a stacked state, a document tray 2 serving as a document supply unit, a laterally U-shaped transport path 3, and a transported document in a stacked state. A paper discharge tray 4 serving as a discharge unit, a paper feed roller 5 for feeding a document on the document tray 2 to the transport path 3, transport rollers 6a to 6d and driven rollers 7a to 7d for transporting the document in the transport path 3 while nipping it. And a paper discharge roller 8 provided in the vicinity of the exit of the conveyance path 3 and a CIS reading unit 9 for reading the image of the back side of the document at the reading position P2. The ADF 1 reverses the original fed from the original tray 2 to the conveyance path 3 so as to make a U-turn from the top to the bottom along the substantially U-shaped conveyance path 3 and is conveyed to the reading position P1. The image on the front side of the document is read by the CCD reading unit 13 when passing through the reading position P1, and further, the image on the back side of the document is read by the CIS reading unit 9 when transported through the transport path 3 and passes through the reading position P2. The image is read and then discharged to a discharge tray 4 below the document tray 2. It is to be noted that the double-sided reading of the original by the copy / facsimile multifunction peripheral 100 is arbitrary, and of course, only single-sided reading is possible.

  The document tray 2 is provided above the document pressing plate 102 so as to be slightly inclined in the direction in which the document is supplied, and a plurality of documents are stacked on the upper surface of the document tray 2. When the user places a document on the document tray 2, the document is placed so that the leading end of the document is inserted into the entrance of the conveyance path 3 on the inclined lower end side of the document tray 2. Although not shown in the figure, the document tray 2 is provided with a variable guide that regulates the position of the document in the width direction and prevents the document from being obliquely fed. On the other hand, the paper discharge tray 4 is provided on the upper and lower stages of the document tray 2 and is formed integrally with the main body frame 102 a of the document pressing plate 102.

  As shown in FIG. 3, the conveyance path 3 is formed in a substantially U shape in the horizontal direction from the document tray 2 to the paper discharge tray 4, and a reading position P <b> 1 facing the platen glass 12 is provided immediately downstream of the folded portion. Further, it passes below the CIS reading unit 9 which is the reading position P2 on the downstream side of the reading position P1, and communicates with the paper discharge tray 4. The conveyance path 3 is formed by an inner guide surface and an outer guide surface facing each other at a predetermined interval through which a document having a predetermined thickness can pass, and a paper guide (guide member) disposed on the main body frame 102a. The guide member 30 and the intermediate frame 102c constitute the inner guide surface, and the main body frame 102a and the ADF cover 102b constitute the outer guide surface. In addition, the member which comprises the outer side guide surface of the conveyance path 3 is not limited to the main body frame 102a etc. which were shown in this Embodiment, Although it can take another form in the range which does not change the summary of this invention. It is preferable that the body frame 102a and the ADF cover 102b of the document pressing plate 102 are integrally formed using a plastic material so that the body frame 102a and the ADF cover 102b also serve as members constituting the outer guide surface, thereby reducing the number of parts and facilitating assembly.

  The paper feed roller 5 is disposed in the ADF cover 102b near the entrance of the transport path 3, and feeds the original into the transport path 3 by rotating while being pressed against the original fed from the original tray 2. For example, a roller made of silicon or EPDM (Ethylene-Propylene-Diethylene Methylene Linkage) is fixed to a metal roller shaft. Further, on the upstream side of the paper feed roller 5, a pickup roller 50 for feeding the uppermost paper of the original placed on the original tray 2 is disposed in the ADF cover 102b. Similarly to the paper feed roller 5, the pick-up roller 50 is rotated while being in pressure contact with the original so that the original is fed into the transport path 3, and is swung up and down by a paper feed clutch (not shown). It is supported by the arm 51. Due to the swinging of the swinging arm 51, the pickup roller 50 is lifted so as to open the transport path 3 in a normal state such as when a document is placed on the document tray 2, and the document is moved when the document is fed. The sheet is lowered so as to be in contact with the uppermost sheet, and the pickup roller 50 and the sheet feeding roller 5 are rotated, whereby the uppermost sheet of the original is fed into the conveyance path 3. Since the pickup roller 50 can be lowered until it contacts the inner guide surface of the conveyance path 3, even if the thickness of the bundle of documents changes depending on the number of documents, it can always contact the uppermost sheet. Although not shown in the drawing, the presence or absence of a document on the document tray 2 is detected by a document set sensor, and the control means operates the paper feed roller 5, the pickup roller 50, and the swing arm 51 based on the detection signal. It is intended to control.

  On the other hand, a separation pad 52 is provided on the intermediate frame 102 c below the paper feed roller 5. The separation pad 52 has a friction coefficient with respect to the document lower than that with respect to the document of the paper feed roller 5 and higher than the friction coefficient between documents, and can be formed of, for example, urethane resin. Such a separation pad 52 is stuck on the upper surface of the separation pad holder 53. The separation pad holder 53 is fitted to the inner guide surface of the conveyance path 3 so as to be swingable, and is biased upward by a coil spring 54, whereby the separation pad 52 is placed on the conveyance surface of the paper feed roller 5. It can be turned downward in accordance with the thickness of the original that is in pressure contact and passes through the pressure contact portion.

  The intermediate frame 102c is equipped with a CIS reading unit 9. The CIS reading unit 9 uses a so-called contact image sensor (hereinafter referred to as “CIS”), which is not shown in detail in the drawing, but reflects reflected light from a document irradiated by a light source. This is a fixed type reading means that converges and reads on the photoconductive element with a converging fiber. As shown in FIG. 3, the CIS reading unit 9 is disposed on the intermediate frame 102c on the opposite side and the downstream side of the conveyance path 3 where the CCD reading unit 13 is located. An image on the back side of the original that has been nipped and conveyed in pressure contact with the roller 7d is read. The platen roller 18 is disposed in the ADF main body 102a, presses the conveyed document against the CIS reading unit 9, and serves as a white reference for the CIS reading unit 9. In general, the CIS adopted in the CIS reading unit 9 has a shallow subject depth, so that the image is read while the original is nipped by the platen roller 18. Note that the image signal read by the CIS reading unit 9 and converted into an electric signal is also subjected to analog / digital conversion, shading processing, etc., and is then performed by an image recording unit such as a printer, as with the CCD reading unit 13. It is recorded on a recording sheet or transmitted by a transmission unit such as CODEC.

  The conveying rollers 6a to 6d press and nip the original fed by the paper feeding roller 5 between the opposed driven rollers 7a to 7d and nip the originals along the conveying path 3 to read the position P1 and the reading position. The position P2 is passed at a constant speed and further conveyed to the paper discharge roller 8 on the downstream side. The conveyance rollers 6 a and 6 b are positioned upstream from the folded portion of the laterally substantially U-shaped conveyance path 3, and the document fed into the conveyance path 3 by the paper feed roller 5 is downstream from the folded portion of the conveyance path 3. It conveys to the side. On the other hand, the transport roller (first transport roller) 6c is positioned downstream of the laterally substantially U-shaped transport path 3 and immediately upstream of the reading position P1, and the transport roller (second transport roller) 6d is laterally oriented. A document which is located downstream of the substantially U-shaped conveyance path 3 and immediately downstream of the reading position P1 and sequentially conveys the document conveyed by the conveying rollers 6a and 6b to the reading position P1 and the reading position P2. It is. Therefore, the conveyance rollers 6c and 6d nip the original to convey the reading position P1 at a predetermined speed with respect to the reading position P1 for reading the front surface of the original, and the conveying roller 6d for the reading position P2 for reading the back side of the original. The paper discharge roller 8 nips the original and conveys the reading position P2 at a predetermined speed.

  As shown in FIG. 4, the transport rollers 6a to 6d have a plurality of roller bodies 61a to 61d pivoted on roller shafts 60a to 60d rotatably supported by a paper guide 30 fixed to the body frame 102a. For example, a roller made of silicon or EPDM is fixed to a metal roller shaft, and in this embodiment, four roller shafts 60a to 60d are provided with four rollers. Each of the roller bodies 61a to 61d is provided, and the number and position of the roller bodies 61a to 61d are appropriately set in consideration of the size of the document to be conveyed.

  As shown in FIG. 4, the paper guide 30 is provided on both sides of the upper paper guide 31 and an upper paper guide 31 that constitutes an inner guide surface upstream of the folded portion of the substantially U-shaped conveyance path 3 in the lateral direction. The side frame 32 is integrally formed of a plastic material, and further, a lower paper guide 33 that forms an inner guide surface downstream of the folded portion of the conveyance path 3 below the upper paper guide 31. A guide cover 34 and a platen guide 35 serving as an access section cover are disposed. Hereinafter, the configuration of the paper guide 30 will be described in more detail.

  The plastic material of the upper paper guide 31 and the side frame 32 is a synthetic resin that can be integrally molded using a mold. For example, ABS, high-impact polystyrene, or a material in which a reinforcing material such as glass fiber is added thereto may be used. it can. The upper paper guide 31 has an upper guide surface 310 having a shape in which the upstream side of the upper surface is inclined in the same manner as the document tray 2 and the downstream side is curved downward. An inner guide surface upstream of the folded portion of the substantially U-shaped conveyance path 3 is formed. Paper feed ribs 311 are arranged in the width direction on the upper guide surface 310 to reduce the frictional force applied to the document by reducing the contact surface with the curved document while sliding on the upper guide surface 310. is doing.

  A concave groove 314 is formed in the upper guide surface 310 in a direction perpendicular to the document transport direction. The recessed groove 314 is formed integrally with the paper guide 30 together with the upper guide surface 310 in order to accommodate the conveyance roller 6b disposed on the upper guide surface 310. From the outer shape of the roller body 61b of the conveyance roller 6b, It is a groove having a slightly large U-shaped cross section. At each position of the recessed groove 314 corresponding to the roller body 61b of the transport roller 6b, the paper feed rib 311 protrudes from the upstream wall and the downstream wall of the recessed groove 314 in the direction of narrowing the groove width.

  The side frame 32 is integrally formed on both sides of the upper paper guide 31 and supports the transport rollers 6 a to 6 d and reinforces the upper paper guide 31. As shown in FIG. 5, reinforcing ribs 320 protrude outward in the horizontal direction at the peripheral edge of each side frame 32 to enhance the rigidity of each side frame 32. Through holes 321 are appropriately formed in the reinforcing ribs 320. Fixing members such as screws are inserted into the through holes 321, and the paper guide 30 is fixed to the main body frame 102a of the original pressing plate 102 with screws. Fix it. The side frames 32 have through holes 322 through which the roller shafts 60a to 60d of the transport rollers 6a to 6d are inserted. The roller shafts 60 a to 60 d are inserted into the through holes 322 and are rotatably supported, so that the transport rollers 6 a to 6 d are arranged at predetermined positions with respect to the upper paper guide 31.

  FIG. 5 shows a drive transmission mechanism for the transport rollers 6a to 6d. Although not shown in the drawing, the drive transmission mechanism is disposed on the side of the side frame, and as shown in FIG. 5, a drive connected to a drive shaft 401 of a drive motor 400 (not shown). The gear 402 engages with the transport gear 403 connected to the roller shaft 60b of the transport roller 6b and the transport gear 404 connected to the roller shaft 60d of the transport roller 6d to transmit the drive from the drive source to the roller shafts 60b and 60d. Drive transmission is performed via an intermediate gear 409 to the transport gear 408 connected to the roller shaft 60a of the transport roller 6a. Further, a belt 407 is wound from a conveying pulley 405 connected to the roller shaft 60b to a conveying pulley 406 connected to the roller shaft 60c of the conveying roller 6c, and a roller shaft is passed from the driving gear 402 via the conveying pulleys 405 and 406. Drive transmission is performed at 60c. Note that these drive transmission mechanisms are examples, and other drive mechanisms can of course be employed. The transport rollers 6a to 6d pivotally supported on the upper paper guide 31 are rotated by such a drive transmission mechanism.

  In addition, the lower paper guide 33 and the guide cover 34 disposed on the lower side of the upper paper guide 31 are each formed of a plastic material, and as shown in FIG. A side paper guide 33 is disposed, and a guide cover 34 and a platen guide 35 are disposed on the lower paper guide 33 so that the inner guide surface on the downstream side of the folded portion of the laterally substantially U-shaped conveyance path 3 is disposed. Constitute. The platen guide 35 is used as a white reference for the CCD reading unit 13 while restricting the passage position of the document as an inner guide surface at the reading position P1. The lower paper guide 33 can be fitted to the upper paper guide 31 by snap fitting. The guide cover 34 can be fitted to the lower paper guide 33 by snap fitting from the image reading opening 20 of the main body frame 102a. The platen guide 35 is supported by a support shaft 339 formed on the lower paper guide 33, and can be fitted to the lower paper guide 33 from the image reading opening 20 of the main body frame 102a. Hereinafter, the lower paper guide 33, the guide cover 34, and the platen guide 35 will be described in detail.

  As shown in FIGS. 4, 6, and 7, the lower paper guide 33 is disposed below the upper paper guide 31, and the lower surfaces 330 a and 330 b of the lower paper guide 33 are located on the downstream side of the folded portion of the conveyance path 3. It constitutes the guide surface. The lower surface 330 a of the lower paper guide 33 constitutes an inner guide surface upstream of the reading position P <b> 1 among the inner guide surfaces downstream of the folded portion of the transport path 3. On the other hand, the lower surface 330 b of the lower paper guide 33 constitutes an inner guide surface downstream of the reading position P <b> 1 among the inner guide surfaces on the downstream side of the folded portion of the transport path 3. Claws 331 project from the upstream end of the lower paper guide 33 at a predetermined interval in the document width direction, and projecting pieces 332 having locking holes 332a formed on both side walls project outward in the horizontal direction. ing. On the other hand, the upper paper guide 31 is provided with a locking hole 316 at a position corresponding to each of the claws 331 at the downstream end of the guide surface 310 corresponding to the folded portion of the conveyance path 3. As shown in FIG. 6, hook-like locking claws 317 are formed in the vicinity of both sides of the upper paper guide 31 and at positions corresponding to the protruding pieces 332. As shown in FIG. 7, the claw 331 of the lower paper guide 33 is fitted into the locking hole 316 of the upper paper guide 31, and the protrusion 332 of the lower paper guide 33 is locked as shown in FIG. The locking pawl 317 of the upper paper guide 31 is inserted into the hole 332a and the protruding piece 332 is locked by the flange portion 317a, whereby the lower paper guide 33 is assembled to the upper paper guide 31. The locking claw 317 is made of a synthetic resin integrally formed with the upper paper guide 31, and when inserted into the locking hole 332, it can be easily deformed so as to incline to the upstream side. The lower paper guide 33 can be assembled to the upper paper guide 31 without using it.

  Further, as shown in FIGS. 7 and 9, the lower paper guide 33 has an access portion 333 recessed between the lower surface 330a and the lower surface 330b, that is, at the reading position P1. The access portion 333 is recessed across the width direction of the lower surfaces 330a and 330b between the transport rollers 6c and 6d immediately upstream and immediately downstream of the reading position P1, and the recess on the downstream side is larger than the upstream side. It is a step dent. In the upper corners on the upstream side and the downstream side of the access unit 333, punch holes 334 are formed at positions corresponding to the roller main bodies 61c and 61d of the transport rollers 6c and 6d. A part of the conveyance surface of each roller body 61c, 61d is exposed. Further, the lower surface 330a, 330b on the upstream side and the downstream side of the reading position P1 is also formed with a punch hole 335, and a part of the conveying surface of each roller body 61c, 61d is exposed from the punch hole 335. ing.

  As shown in FIGS. 4, 6, 7 and 9, the guide cover 34 is detachably assembled to the lower paper guide 33 so as to cover the downstream side of the access portion 333 of the lower paper guide 33. is there. The lower surface 340 of the guide cover 34 is provided so as to continue from the lower surface 330b of the lower paper guide 33 toward the upstream side, and along with the lower surface 330b of the lower paper guide, on the downstream side of the reading position P1 of the conveyance path 3. The inner guide surface of is constructed. At the upstream end of the guide cover 34, a projecting piece 341 having notches 341a formed at a predetermined interval in the document width direction is projected in the horizontal direction, and a claw 342 is formed at a predetermined interval in the document width direction at the downstream end. Projected. On the other hand, as shown in FIG. 6, a hook-like locking claw 336 is provided in the upstream portion of the two-stage access portion 333 of the lower paper guide 33, and in the vicinity of the lower corner portion on the downstream side of the access portion 333. A recessed portion 337 is formed in the. The claw 342 of the guide cover 34 is fitted into the recessed portion 337 of the lower paper guide 33, and the protrusion 341 of the guide cover 34 is locked by the locking claw 336 of the lower paper guide 33. A guide cover 34 is assembled to the paper guide 33. The locking claw 336 is made of a synthetic resin integrally formed with the lower paper guide 33. When the locking claw 336 is locked to the protruding piece 341, it can be easily deformed so as to incline to the upstream side. The guide cover 34 can be attached to and detached from the lower paper guide 33 only by human hands without using.

  As shown in FIGS. 4, 6, 7, 9, and 10, the platen guide 35 is detachably assembled to the lower paper guide so as to cover the upstream side of the access portion 333 of the lower paper guide 33. Is. The lower surface 350 of the platen guide 35 constitutes an inner guide surface of the conveyance path 3 between the lower surface 330a of the lower paper guide 33 and the lower surface 340 of the guide cover 34, that is, facing the reading position P1. Further, a white tape 350 a as a white reference for the CCD reading unit 13 is attached to the lower surface 350. As shown in FIG. 10, on both sides of the platen guide 35, standing portions 351 are formed at the downstream end in the document transport direction, and shaft holes 352 are formed in the standing portions 351. Further, a claw 353 that is a locking piece protrudes from the upstream end of the platen guide 35 at a predetermined interval in the document width direction. On the other hand, on both side walls of the lower paper guide 33, support pieces 338 are respectively formed by providing notches at predetermined intervals from the lower end to the vertically upper side, and a support shaft 339 is horizontally disposed inside the support piece 338. Projected to Further, as shown in FIG. 7, a locking hole 354 is formed at a position corresponding to the claw 353 in the vicinity of the lower corner portion on the upstream side of the access portion 333. The claw 353 of the platen guide 35 is engaged with the locking hole 354 of the lower paper guide 33, and the support shaft 339 of the lower paper guide 33 is inserted into the shaft hole 352 of the platen guide 35, so that the lower side A coil spring, which is an elastic member disposed in the upstream portion of the access portion 333, is assembled to the paper guide 33 so that the platen guide 35 can swing about the support shaft 339 as a swing limit within the range of the locking hole 354. The platen guide 35 is biased downward by 356, which is the direction toward the reading position P1. The support piece 338 can be easily deformed so as to incline outward when the support shaft 339 is inserted into the shaft hole 352 due to the notches on both sides thereof, so that the platen guide 35 can be moved downward without using a tool or the like. It can be attached to and detached from the paper guide 33. In addition, convex portions 355 are formed on both sides of the lower surface 350 of the platen guide 35 to keep the distance from the platen glass 12 constant. When the convex portion 355 contacts the platen glass 12 at the reading position P1, the distance between the platen guide 35 and the platen glass 12 is always kept constant, and the document is guided so as to pass through the fixed position at the reading position P1. As described above, since the platen guide 35 is swingable and biased downward, the document pressing plate 102 is not completely closed, and a slight gap is generated between the platen guide 35 and the reading table 101. Even in such a case, the platen guide 35 is swung, so that the distance between the platen guide 35 and the platen glass 12 is kept constant. In the present embodiment, the tape 350a is attached to the lower surface 350 of the platen guide 35 as the white reference of the CCD reading unit 13, but the lower surface 350 of the platen guide 35 is painted white instead of the tape 350a. It can also be a white reference.

  In this manner, the lower paper guide 33, the guide cover 34, and the platen guide 35 can be sequentially assembled to the upper paper guide 31. Further, when cleaning the roller main body 61 of each conveying roller 6, the access portion 333 of the lower paper guide 33 can be obtained by removing the platen guide 35 and the guide cover 34 through the image reading opening 20 of the main body frame 102a. Since the conveying surfaces of the roller main bodies 61c and 61d can be accessed through the punching holes 335, it is not necessary to disassemble the paper guide 30, and the platen guide 35 and the guide cover 34 can be easily attached and detached without using a tool or the like. Can be done. Further, the lower paper guide 33, the guide cover 34, and the platen guide 35 are fixed to the upper paper guide 31 or the lower paper guide 33 by a snap fit without using fixing materials such as screws, respectively. Therefore, the assembly work and the disassembly work can be easily performed only by hand without requiring a tool or the like.

  Hereinafter, the configuration of the main body frame 102a will be described in detail. As shown in FIG. 11, the main body frame 102 a has an image reading opening 20 at a position corresponding to the guide cover 34 and the platen guide 35 that cover the access portion 333 of the lower paper guide 33 of the paper guide 30. When the paper guide 30 is fixed to the main body frame 102a, the platen guide 35 protrudes from the image reading opening 20 toward the platen glass 12. As shown in FIG. 3, the image reading opening 20 is opposed to the platen glass 12 when the document pressing plate 102 is closed with respect to the reading table 101. The document conveyed along the paper guide 30 is guided from the platen glass 12 so as to pass through a certain position by the platen guide 35 protruding from the image reading opening 20 at the reading position P1, and the CCD reading unit 13 (FIG. 1), the image is read. The upstream side and the downstream side of the image reading opening 20 are outer guide surfaces 21 and 22 that are inclined upward from the image reading opening 20, respectively. A guide surface on the downstream side of the folded portion of the letter-shaped transport path 3 and upstream and downstream of the reading position P1 is formed and transported together with the opposing inner guide surfaces such as the lower paper guide 33 of the paper guide 30 and the like. A path 3 is formed.

  As shown in FIG. 11, four notches 23 and 24 are formed in the width direction in the outer guide surfaces 21 and 22, respectively, and the conveying rollers 6c and 6d are formed in the notches 23 and 24, respectively. Are respectively disposed, and a part of the roller body is exposed to the guide surfaces 21 and 22 from the notches 23 and 24, respectively. These driven rollers 7c and 7d are opposed to the respective transport rollers 6c and 6d disposed on the downstream side of the folded portion of the paper guide 30, and nip the document immediately upstream and immediately downstream of the reading position P1. Transport.

  Further, a recessed portion 25 in which the platen roller 18 facing the CIS reading unit 9 is disposed is formed on the downstream side of the guide surface 22. Further, four concave portions 26 are formed at the most downstream end of the guide surface 22 in the same manner as the notches 23 and 24, and the paper discharge roller 8 is disposed in the concave portions 26.

  Further, as shown in FIG. 11, a notch 27L is formed on the left side where the paper guide 30 is disposed on the back side of the main body frame 102a, and a concave portion 27R formed by denting the bottom surface of the main body frame 102a on the right side. Is formed. The notch 27L and the recess 27R are for attaching a hinge member 90 that pivotally supports the document pressing plate 102 with respect to the reading table 101, and are usually provided in a pair on the left and right. Reinforcing ribs 28 are appropriately formed on the back surface side where the cutout portion 27L is formed and on the front side of the outer guide surfaces 21 and 22, and around the cutout portion 27L is for fixing the hinge member to the main body frame 102a. Screw holes 29 are provided, and screw holes 29 for fixing the paper guide 30 to the main body frame 102a are also provided on both sides of the outer guide surfaces 21 and 22. On the other hand, the recess 27 </ b> R has a known configuration for attaching the hinge member 90.

  The paper guide 30 is fixed to the main body frame 102a with the outer side guide surfaces 21 and 22 of the main body frame 102a thus configured facing the inner guide surface constituted by the lower paper guide 33 and the like of the paper guide 30. Is done. Further, as shown in FIG. 3, a pressing pad 19 that presses a document placed on the platen glass 11 when the reading table 101 functions as an FBS is fixed to the lower surface of the main body frame 102a by adhesion. The

  Further, as shown in FIG. 12, the ADF cover 102b is pivotally supported at the fulcrum C1 on the main body frame 102a so as to be openable and closable with respect to the main body frame 102a. Is opened with respect to the main body frame 102a, so that the paper feed roller 5, the pickup roller 50 and the driven rollers 7a and 7b arranged on the ADF cover 102b rotate together, and the conveying rollers 6a and 6b and the driven rollers are rotated. The nips with 7a and 7b can be released respectively.

  Further, as shown in FIG. 12, the intermediate frame 102c is pivotally supported on the main body frame 102a at the same fulcrum C2 as the axis of the roller shaft 60a of the conveying roller 6a, thereby opening and closing the main frame 102a. When the intermediate frame 102c is opened with respect to the main body frame 102a, the CIS reading unit 9 and one of the paper discharge rollers 8 disposed on the intermediate frame 102c rotate together, The nip between the CIS reading unit 9 and the platen roller 18 and the nip of the paper discharge roller 8 can be respectively released.

  A procedure for cleaning the transport rollers 6a to 6d of the ADF 1 in the copy / facsimile multifunction peripheral 100 will be described below. As shown in FIG. 12, the conveyance rollers 6a and 6b open the ADF cover 102b with the document pressing plate 102 closed with respect to the reading table 101, thereby conveying the conveyance rollers 6a and 6b and the driven rollers 7a and 7b. And the conveyance surfaces are exposed, so that each conveyance surface can be cleaned with a cloth soaked with a cleaning liquid.

  However, the nip between the conveying rollers 6c and 6d disposed immediately upstream and immediately downstream of the document reading opening 20 and the driven rollers 7c and 7d facing these rollers is a paper guide 30 that supports the conveying rollers 6c and 6d. And the main body frame 102a on which the driven rollers 7c and 7d are disposed are fixed by a fixing tool such as a screw, and cannot be released unless the fixing tool is removed. Therefore, in the copy / facsimile multifunction peripheral 100, the transport rollers 6c and 6d of the ADF 1 are cleaned according to the following procedure.

  First, the document pressing plate 102 equipped with the ADF 1 is opened with respect to the reading table 101 as shown in FIG. 2, and the document reading opening 20 is opened from the lower side of the main body frame 102a as shown in FIG. Let it be in an exposed state. In this state, the transport rollers 6c and 6d are not exposed at all.

  Next, as shown in FIG. 14, the platen guide 35 is removed from the lower side of the main body frame 102 a from the paper guide 30 through the document reading opening 20. Specifically, the tip of one support piece 338 of the lower paper guide 33 of the paper guide 30 shown in FIG. 10 is pressed outward to be inclined, and the lower paper guide is inserted from the shaft hole 352 of the platen guide 35. The support shaft 339 of 33 is removed. At this time, since the platen guide 35 is urged downward by the coil spring 356 by the coil spring 356 as shown in FIG. 7, the platen guide 35 is locked with the locking hole 354 of the lower paper guide 33 by the claw 353. In this case, the support shaft 339 does not fit into the shaft hole 352 again even if the pressing of the support piece 338 is released because the rotation is slightly performed around the locking portion. Further, the shaft hole 352 on the opposite side of the platen guide 35 is similarly removed from the other support shaft 339. Next, the platen guide 35 is moved to the guide cover 34 side, the claw 353 of the platen guide 35 is released from the locking with the locking hole 354 of the lower paper guide 33, and the platen guide 35 is read by the image of the main body frame 102a. Remove from the opening 20. As described above, the support piece 338 can be easily deformed so as to incline outward when the support shaft 339 is inserted into the shaft hole 352 due to the notches on both sides thereof. The platen guide 35 can be removed from the lower paper guide 33. As a result, as shown in the figure, a part of the conveyance surface of the roller main body 61c of the conveyance roller 6c from the hole 335 of the access portion 333 of the lower paper guide 33 is located with respect to the image reading opening 20 of the main body frame 102a. Exposed.

  Next, as shown in FIG. 15, the guide cover 34 is removed from the lower paper guide 33 of the paper guide 30 through the image reading opening 20 of the main body frame 102a. Specifically, first, the vicinity of the tip of the locking claw 336 of the lower paper guide 33 is pressed toward the upstream side, the locking claw 336 is deformed and tilted, and the protruding piece 341 of the guide cover 34 is locked. 336 is released. At the same time, the guide cover 34 is moved to the downstream side, the claw 342 of the guide cover 34 is released from fitting into the recessed portion 337 of the lower paper guide 33, and the guide cover 34 is removed from the lower paper guide 33 to the main body frame 102a. It is removed through the image reading opening 20. As described above, the locking claw 336 is made of a synthetic resin integrally formed with the lower paper guide 33. When the locking claw 336 is locked to the protruding piece 341, the locking claw 336 can be deformed so as to incline toward the upstream side. Since it is easy, the guide cover 34 can be removed from the lower paper guide 33 only by hand without using a tool or the like. As a result, as shown in the figure, a part of the conveyance surface of the roller main body 61d of the conveyance roller 6d from the hole 334 of the access portion 333 of the lower paper guide 33 is located with respect to the image reading opening 20 of the main body frame 102a. Exposed.

Next, in the state shown in FIG. 15, the transport rollers 6c and 6d are rotated in the cleaning mode. Hereinafter, the cleaning mode will be described.
FIG. 16 is a diagram showing the control means 500 of the copy / facsimile multifunction peripheral 100. The control unit 500 controls the drive motor 400 and the power source 501 based on an instruction input from the operation panel 103 (see FIG. 2) or an open / close signal output from the open / close sensor 104, thereby conveying rollers 6a to 6d. And has a function of controlling the rotation of the MPU (Micro Processing Unit) and a ROM (Read Only Memory). Here, the MPU is an arithmetic processing circuit that is connected to each unit constituting the copy / facsimile multifunction peripheral 100 via a bus and controls the operation of each unit. The open / close sensor 104 detects an open / close state of the document pressing plate 102 with respect to the reading table 101, and when the document pressing plate 102 detects an open state with respect to the reading table 101, an open signal indicating an open state is provided. When it is detected that the document pressing plate 102 is completely closed with respect to the reading table 101, a closing signal indicating the closed state is output to the control means 500, respectively.

  The control unit 500 receives the normal mode setting for using the copy function, the scanner function, the facsimile function, etc. of the copy / facsimile multifunction peripheral 100 from the operation panel 103 and the open signal from the open / close sensor 104. In such a case, the conveyance rollers 6a to 6d are not rotated by turning off the power source 501. On the other hand, when the cleaning mode setting for cleaning the transport surfaces of the transport rollers 6 a to 6 d is input from the operation panel 103 and the open signal is input from the open / close sensor 104, the control unit 500 supplies the power source 501. Is kept ON, and the driving motor 400 is driven to rotate the transport rollers 6a to 6d at a predetermined speed.

A control operation of the control unit 500 will be described.
First, a case where the normal mode is input and set from the operation panel 103 by an instruction input person such as a user will be described. When the open / close sensor 104 detects that the document pressing plate 102 is completely closed with respect to the reading table 101, the open / close sensor 104 outputs a close signal to the control means 500. Based on the sensing information indicating the closed state, the control means 500 controls the drive motor 400 without turning off the power source 501 based only on the instruction input by the instruction input person from the operation panel 103, and controls the transport rollers 6a to 6d. To drive.

  On the other hand, when the normal mode is set and the open / close sensor 104 senses that the document pressing plate 102 is open, the open / close sensor 104 outputs an open signal to the control means 500. Based on the open signal, the control unit 500 controls the drive motor 400 to stop driving by turning off the power source 501, thereby stopping the rotation of the transport rollers 6a to 6d. This is for preventing cloths and the like from being wound around the rotating transport rollers 6a to 6d and the like.

  Next, a case where the cleaning mode is input and set from the operation unit panel 103 by the instruction input person will be described. Regardless of whether the document pressing plate 102 is closed or opened, the control means 500 controls the drive motor 400 without turning off the power source 501 and sets the transport rollers 6a to 6d to a predetermined value. Rotate at speed. The predetermined speed may be a speed suitable for cleaning the transport rollers 6a to 6d, and may be the same speed as a slow speed among the transport speeds for transporting the document.

  In the above-described cleaning operation, since the document pressing plate 102 of the copy / facsimile multifunction peripheral 100 is opened, the open / close sensor 104 detects that the document pressing plate 102 is open and outputs an open signal to the control means 500. Then, the control means 500 turns off the power source 501 based on this open signal. In this state, as described above, the platen guide 35 and the guide cover 34 are sequentially removed from the lower paper guide 33 through the document reading opening 20.

  Next, a cleaner who is an instruction input person inputs from the operation unit panel 103 to set the cleaning mode. When the cleaning mode is set, even when an open signal of the document pressing plate 102 is input from the open / close sensor 104, the control unit 500 turns on the power source 501 to control the drive motor 400, thereby causing the conveying rollers 6a to 6d to move at a predetermined speed. Rotate with. When the transport rollers 6c and 6d rotate, the transport surfaces of the roller main bodies 61c and 61d are pressed through the document reading opening 20 by pressing a cloth soaked with a cleaning liquid onto the exposed transport surfaces of the roller main bodies 61c and 61d, respectively. Everything can be cleaned.

  Further, after cleaning, the cleaner performs input from the operation unit panel 103 and sets to the normal mode, and then follows the reverse procedure to the above, so that the lower paper guide 33 of the document pressing plate 102 is placed on the lower paper guide 33. The guide cover 34 and the platen guide 35 are attached in this order through the image reading opening 20. The attaching operation can also be easily performed manually without using a tool or the like. Thus, without removing the paper guide 30 and the like from the document pressing plate 102, the guide cover 34 and the platen guide 35 are attached / detached through the image reading opening 20 with the document pressing plate 102 opened, and the transport rollers 6c and 6d. Since the roller main bodies 61c and 61d can be exposed through the image reading opening 20, the transport rollers 6c and 6d can be easily cleaned.

  Accordingly, as the ADF 1 transports a large number of documents, foreign materials can be removed from the transport surfaces of the transport rollers 6c and 6d to which foreign materials such as unfixed toner, vermilion, writing instrument residue, and paper dust adhere. By cleaning the conveyance roller 6c immediately upstream of the reading position P1, foreign matter adhering to the conveyance surface is carried and adhered to the platen glass 12 by the subsequent document, and appears as a black streak in the read image. It can be prevented or eliminated. Similarly, by cleaning the conveyance roller 6d immediately upstream of the reading position P2, the foreign matter adhering to the conveyance surface adheres to the CIS reading unit 9 and appears as a black streak in the read image. Can be prevented or eliminated. In addition, it is possible to prevent or eliminate the problem that the original conveyed by the conveying roller 6d slips, the satisfactory conveyance at a predetermined speed is not performed, and the read image is distorted.

  As described above, the conveyance rollers 6a and 6b, the paper discharge roller 8 and the like of the document pressing plate 102 are opened by opening the ADF cover 102b and the intermediate cover 102c, and a part of the conveyance surface is exposed. Therefore, in this state, the cleaner inputs and sets the cleaning mode from the operation panel 103 to rotate the transport rollers 6a and 6b and the paper discharge roller, and the cleaner soaks the cleaning liquid into the exposed transport surface. By pressing a cloth or the like, the entire conveying surface can be cleaned.

  In this embodiment, it is assumed that the copy / facsimile multifunction peripheral 100 can perform double-sided reading by the CCD reading unit 13 and the CIS reading unit 9, and the conveyance roller 6d immediately downstream of the document reading opening 20 is provided with the CCD reading unit 13. , And the CIS reading unit 9 functions as a conveyance roller before reading, so that the position of the conveyance roller 6d is between the reading position P1 and the reading position P2. It is disposed downstream of the document reading opening 20 so as to be in the vicinity of the middle. As a result, the access portion 333 is widened to the downstream side by a distance slightly away from the document reading opening 20. Considering the arrangement position of the driven rollers 7c and 7d facing the conveyance rollers 6c and 6d, a certain distance is required from the reading position P1 to the arrangement position of the conveyance rollers 6c and 6d. Therefore, in addition to the platen guide 35 that covers the document reading opening 20, a guide cover 34 that covers the downstream side of the access unit 333 is separately provided, so that the guide cover 34 and the platen guide 35 through the document reading opening 20 are provided. For example, if the copy / facsimile multifunction peripheral 100 is used as a single-sided read-only machine without providing the CIS reading unit 9, the document is conveyed at an accurate constant speed at the reading position P1. For this purpose, it is preferable to dispose the transport rollers 6c and 6d in the transport path 3 on the upstream side and the downstream side close to the reading position P1. In this case, the access portion 333 may be a single-step recess, instead of a two-step recess having a recess on the downstream side larger than the upstream side. Further, the access portion 333 may be configured to be covered only by the platen guide 35 as an access portion cover member without providing the guide cover 34.

  The configuration of the copy / facsimile multifunction peripheral 100 shown in the present embodiment is only one aspect of the image reading apparatus according to the present invention, and it is needless to say that the design can be changed as appropriate without departing from the gist of the present invention. For example, it can be realized as a single machine such as a copier, a facsimile machine, or a scanner.

  The image reading apparatus according to the present invention can be used as a scanner, a facsimile machine, a copying machine, or the like that has an automatic document transport mechanism and has a document pressing plate that can be opened and closed with respect to the apparatus main body.

1 is a cross-sectional view showing a schematic configuration of an upper part of a copy / facsimile multifunction peripheral 100 according to an embodiment of the present invention. FIG. 2 is a perspective view showing an upper appearance of the copy / facsimile multifunction peripheral 100 with a document pressing plate 102 opened. 2 is an enlarged cross-sectional view illustrating a schematic configuration of an upper part of the copy / facsimile multifunction peripheral 100. FIG. It is a disassembled perspective view which shows the structure of the paper guide 30 and the conveyance rollers 6a-6d. It is sectional drawing which shows the drive transmission mechanism of the conveyance rollers 6a-6d. 4 is a bottom view showing the configuration of the paper guide 30. FIG. It is an expanded sectional view which shows a part of BB cross section of FIG. It is an expanded sectional view which shows a part of CC cross section of FIG. 3 is an enlarged cross-sectional view showing the vicinity of a reading position P1 between a main body frame 102a and a paper guide 30. FIG. FIG. 6 is an exploded perspective view showing the assembly of the platen guide 35 to the lower paper guide 33. It is a top view which shows the structure of the main body frame 102a. 2 is an enlarged cross-sectional view illustrating a schematic configuration of an upper portion of the copy / facsimile multifunction peripheral 100 with an ADF cover 102b and an intermediate frame 102c opened. FIG. It is a bottom view which shows the structure of the main body frame 102a. It is a bottom view which shows the state which removed the platen guide 35 from the main body frame 102a shown in FIG. FIG. 16 is a bottom view showing a state in which a guide cover is removed from the main body frame 102a shown in FIG. 1 is a block diagram showing a configuration of a copy / facsimile multifunction peripheral 100. FIG. 10 is a cross-sectional view showing a schematic configuration of an upper part of a conventional copy / facsimile multifunction peripheral 900. FIG.

Explanation of symbols

1 ADF (automatic document feeder)
2 Document tray 3 Transport path 4 Paper discharge tray 6a, 6b Transport roller 6c Transport roller (first transport roller)
6d Conveying roller (second conveying roller)
9 CIS reading unit (second image reading means)
12 Platen glass (document reading surface)
13 CCD reading unit (image reading means)
20 Document Reading Openings 21 and 22 Outer Guide Surface 30 Paper Guide (Guide Member)
33 Lower paper guide (guide member)
34 Guide cover (access cover)
35 Platen guide (access cover)
100 Copy / facsimile multifunction peripherals (image readers)
101 Reading table (device body)
102 Document pressing plates 330a and 330b Lower surface (inner guide surface)
333 Access unit 340 Lower surface (inner guide surface)
350 Lower surface (inner guide surface)
353 Nail (locking piece)
356 Coil spring (elastic member)

Claims (3)

A document pressing plate is provided in an openable and closable manner with respect to the upper surface of the apparatus main body having a moving document reading surface for reading a moving document reading surface. A moving original positioned near the upper side of the moving original reading surface when the original pressing plate is closed with respect to the upper surface of the apparatus main body by a plurality of conveying rollers disposed along the conveying path. In an image reading apparatus equipped with an automatic document conveying mechanism for discharging to a discharge tray after being conveyed to a reading unit,
The document guide plate is provided from the end of the opening formed in the moving document reading section toward the upstream side and the downstream side, and constitutes an outer guide that constitutes the outer side of the transport path downstream from the folded portion of the transport path. A cover body having a surface,
An access unit that exposes a part of a conveyance surface of a conveyance roller disposed in a conveyance path downstream of the folded portion of the conveyance path to the opening; and a conveyance path downstream of the folded portion of the conveyance path. An inner guide surface that constitutes an inner side, and a guide member that pivotally supports the transport roller is fixed to the cover body,
An access portion cover member that includes an inner guide surface that forms the inner side of the conveyance path downstream from the folded portion of the conveyance path together with the inner guide surface of the guide member is detachably provided on the guide member via the opening. An image reading apparatus. The access portion cover member is
An inner guide surface that forms an inner side of the transport path downstream from the opening together with an inner guide surface of the guide member, and a guide cover that can be attached to and detached from the guide member;
A platen guide that includes an inner guide surface that constitutes the inside of the transport path facing the opening, and is detachable from the guide member;
The image reading apparatus according to claim 1, comprising:   The platen guide is pivotally supported by the guide member and is urged toward the opening by an elastic member positioned between the guide member and a locking piece extending from an end portion is provided on the platen guide. The image reading apparatus according to claim 2, wherein the image reading apparatus can be attached to and detached from the guide member by being locked to the guide cover so as to restrict swinging toward the opening side.

Images