WO2016067750A1 - Image reading apparatus and image forming apparatus comprising image reading apparatus - Google Patents

Image reading apparatus and image forming apparatus comprising image reading apparatus Download PDF

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Publication number
WO2016067750A1
WO2016067750A1 PCT/JP2015/075255 JP2015075255W WO2016067750A1 WO 2016067750 A1 WO2016067750 A1 WO 2016067750A1 JP 2015075255 W JP2015075255 W JP 2015075255W WO 2016067750 A1 WO2016067750 A1 WO 2016067750A1
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WO
WIPO (PCT)
Prior art keywords
document
guide member
reading apparatus
image reading
image
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Application number
PCT/JP2015/075255
Other languages
French (fr)
Japanese (ja)
Inventor
岡田　武彦
岡田　誠司
Original Assignee
京セラドキュメントソリューションズ株式会社
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Application filed by 京セラドキュメントソリューションズ株式会社 filed Critical 京セラドキュメントソリューションズ株式会社
Priority to JP2016556421A priority Critical patent/JP6361895B2/en
Publication of WO2016067750A1 publication Critical patent/WO2016067750A1/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G03B27/50—Projection printing apparatus, e.g. enlarger, copying camera with slit or like diaphragm moving over original for progressive exposure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa

Definitions

  • the present invention relates to an image reading apparatus and an image forming apparatus provided with the image reading apparatus.
  • an image reading apparatus which reads an image of a document conveyed from a paper feed tray by an image sensor and discharges the read document onto a paper discharge tray.
  • the document transport path is formed by a guide plate disposed along the transport path.
  • a contact image sensor also referred to as CIS (contact image sensor)
  • the contact image sensor is housed inside a housing covered on one side with a contact glass.
  • the housing is disposed such that the contact glass faces the document conveyance path.
  • the housing is disposed between a guide plate and a guide plate adjacent to each other in the document conveyance direction.
  • the contact image sensor since the contact image sensor has a narrow depth of field, it is preferable to keep the distance between the contact image sensor and the document passing through the document conveyance path constant as much as possible in order to perform image reading well.
  • the present invention has been made in view of such a point, and the object of the present invention is to improve the accuracy of reading a document image by the contact image sensor by improving the positioning accuracy of the contact image sensor with respect to the document conveyance path. It is to let
  • the image reading apparatus includes a document feeding mechanism, a guide member, a contact image sensor, and a transparent glass plate.
  • the document feeding mechanism conveys a document placed on a paper feed tray along a predetermined document conveyance path and discharges the document onto a paper discharge tray.
  • the guide member is disposed along the predetermined document conveyance path to form the document conveyance path.
  • the contact image sensor is disposed to the side of the predetermined document conveyance path, and reads an image of a document passing through the predetermined document conveyance path.
  • a transparent glass plate covers the document conveyance path side of the contact image sensor.
  • the guide member has a recess and a positioning surface.
  • the recess accommodates the contact image sensor and is covered by the transparent glass plate.
  • the positioning surface is formed on the open peripheral edge of the recess, and by contacting the peripheral edge of the transparent glass plate, the surface of the transparent glass plate on the document transport path side faces the document transport surface of the guide member.
  • the transparent glass is positioned to have a predetermined height.
  • the concave portion for housing the contact image sensor is integrally formed in the guide member that forms the document conveyance path, so that the document can be compared to when the sensor unit is configured separately from the guide member.
  • the positioning accuracy of the contact image sensor with respect to the transport path can be improved.
  • a positioning surface that contacts the transparent glass plate that covers the recess is formed on the open-side peripheral edge of the recess. When the transparent glass plate abuts on the positioning surface, the surface of the transparent glass plate on the document conveyance path side becomes flush with the document conveyance surface of the guide member.
  • the transparent glass plate it is possible to prevent the transparent glass plate from being disposed in a state in which the transparent glass plate is shifted inward or outward with respect to the document conveyance surface of the guide member.
  • the distance between the contact image sensor and the document passing through the document conveyance path (on the contact glass) can be maintained constant. Therefore, the reading accuracy of the document image by the contact image sensor can be further improved.
  • An image forming apparatus includes the above-described image reading apparatus.
  • the present invention by improving the positioning accuracy of the contact image sensor with respect to the document conveyance path, it is possible to improve the reading accuracy of the document image by the contact image sensor.
  • FIG. 1 is a schematic view showing the inside of an image forming apparatus provided with a document feeding device (corresponding to an image reading device) in the embodiment.
  • FIG. 2 is an external perspective view showing the document feeder.
  • FIG. 3 is a schematic vertical sectional view showing the document feeder.
  • FIG. 4 is an external perspective view showing the upstream guide member of the inner guide portion disposed along the document conveyance path.
  • FIG. 5 is an external perspective view showing the document feeder with the upper cover removed.
  • FIG. 6 is an external perspective view showing the document feeder with the upper cover removed.
  • 7 is a cross-sectional view taken along line VII-VII of FIG.
  • FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG.
  • FIG. 9 is a perspective view of a side wall portion of the pair of side wall portions of the document feeding device, which is located closer to the rear side of the image forming apparatus, as viewed from the inside of the pair of side wall portions.
  • FIG. 10 is a view as viewed in the direction of the arrow X in FIG. 9 and is an enlarged view showing a positioning portion formed at the lower end portion of the groove portion.
  • FIG. 1 shows an image forming apparatus 1 provided with a document feeding device (corresponding to an image reading device) 221 in the present embodiment.
  • the image forming apparatus 1 is a laser printer using an electrophotographic method.
  • the image forming apparatus 1 includes an image forming apparatus main body 100, an image reading unit 200 attached to the upper part of the image forming apparatus main body 100, and an operation panel 290 which can be operated by a user.
  • the front side and the rear side respectively mean the front side and the rear side (the left side and the right side in the left and right direction of FIG. 1) of the image forming apparatus 1, and the left side and the right mean the image forming apparatus 1 from the front side. When viewed, it means the left side and the right side (front side and back side in the direction perpendicular to the paper surface of FIG. 1).
  • the image forming apparatus main body 100 has a box-like case 60.
  • An image reading unit 200 is provided on the top of the case 60.
  • a sheet feeding unit 10 In the housing 60, a sheet feeding unit 10, an image forming unit 20, and a fixing unit 40 are accommodated.
  • a plurality of conveyance roller pairs 11 to 13 In the sheet conveyance path L from the sheet feed unit 10 to the sheet discharge tray unit 50, a plurality of conveyance roller pairs 11 to 13 which sandwich and convey the sheet P are disposed.
  • a reverse conveyance path L ′ is provided which branches from the downstream side of the sheet conveyance path L and joins on the upstream side. Conveying roller pairs 14 to 16 are disposed in the reverse conveying path L ′.
  • the sheet feeding unit 10 is disposed at a lower portion in the housing 60.
  • the sheet feeding unit 10 has a sheet feeding cassette 10a in which sheet-like sheets P are stored, and a pickup roller 10b for taking out the sheets P in the sheet feeding cassette 10a and feeding the sheet P out of the cassette.
  • the sheet P fed out of the cassette from the sheet feeding cassette 10 a is supplied to the image forming unit 20 via the conveyance roller pair 11.
  • image forming units 20Bk, 20M, 20C and 20Y for forming toner images corresponding to the respective colors of black, magenta, cyan and yellow are arranged in a line.
  • Each of the image forming units 20Bk, 20M, 20C, and 20Y includes a photosensitive drum 21, a charging device 22, a developing device 23, and a cleaning device 24.
  • an exposure device 25 that irradiates the surface of each photosensitive drum 21 with a laser beam is disposed.
  • An intermediate transfer unit 26 is disposed above the image forming units 20Bk, 20M, 20C, and 20Y.
  • the intermediate transfer unit 26 is provided with an intermediate transfer belt 27 traveling in contact with each photosensitive drum 21.
  • a primary transfer roller 28 is provided inside the intermediate transfer belt 27 so as to sandwich the intermediate transfer belt 27 with the photosensitive drum 21.
  • a secondary transfer roller 29 is provided in contact with the surface of the intermediate transfer belt 27.
  • toner containers 30Bk, 30M, 30C, and 30Y are disposed above the intermediate transfer unit 26.
  • toner containers 30Bk, 30M, 30C, and 30Y are disposed in the toner containers 30Bk, 30M, 30C and 30Y. In the toner containers 30Bk, 30M, 30C and 30Y, toners of respective colors to be supplied to the respective developing devices 23 of the image forming units 20Bk, 20M, 20C and 20Y are stored.
  • the exposure device 25 irradiates the surface of each photosensitive drum 21 with laser light based on predetermined image data (in the present embodiment, document image data read by the image reading unit 200). Form a latent image.
  • the image forming unit 20 develops the formed electrostatic latent image by the developing device 23 to form a toner image of each color.
  • the toner images of the respective colors formed on the surfaces of the photosensitive drums 21 are transferred onto the surface of the intermediate transfer belt 27 by the primary transfer roller 28 and superimposed. Then, the toner image transferred onto the intermediate transfer belt 27 is transferred by the secondary transfer roller 29 onto the sheet P supplied from the sheet feeding unit 10.
  • the sheet P after the transfer is supplied to the fixing unit 40.
  • the fixing unit 40 fixes the toner image on the sheet P by pressing the sheet P supplied from the image forming unit 20 between the fixing roller 40 a and the pressure roller 40 b. Then, the sheet P on which the toner image is fixed by the fixing unit 40 is sent to the downstream side by both the rollers 40 a and 40 b. The sheet P fed from the fixing unit 40 is discharged to the sheet discharge tray unit 50 through the conveyance roller pair 13. When toner images are formed on both sides of the sheet P, the sheet P is switched back by the transport roller pair 13 and transported to the reverse transport path L ′.
  • the image reading unit 200 includes a substantially rectangular case body 250, a document pressing cover 240, and a document feeding device 221.
  • the upper surface of the case body 250 forms a document placement surface 250a on which a document is placed.
  • the image reading unit 200 has a fixed reading mode for reading an image of a document placed on the document placement surface 250 a and a flow reading mode for reading the image while feeding a document one by one continuously by the document feeding device 221. And have.
  • the scanner unit 210 (see FIG. 3) is housed inside the case body 250.
  • the scanner unit 210 optically reads an image of a document placed on the document placement surface 250 a in the fixed reading mode, and optically reads an image on the surface of the document in the flow reading mode to generate image data thereof. .
  • the scanner unit 210 is configured of, for example, a reflection mirror, a CCD sensor, or the like.
  • the document pressing cover 240 covers the document placement surface 250 a so as to be openable and closable.
  • the document pressing cover 240 is rotatably attached to the case body 250 via a hinge mechanism (not shown).
  • the document feeding device 221 is provided on the upper surface side of the document pressing cover 240.
  • the document feeder 221 has a main body case 222.
  • the main body case 222 is provided at the left end of the upper surface side of the document pressing cover 240.
  • the main body case 222 has a pair of side wall portions 222 e and an openable and closable upper cover 222 k.
  • the lower surface of the main body case 222 is constituted by the upper surface of the document pressing cover 240.
  • the pair of side wall portions 222 e are disposed opposite to each other in the front-rear direction across a document conveyance path 225 (see FIG. 3) provided in the document feeding device 221.
  • the pair of side wall portions 222 e is fixed to the upper surface of the document pressing cover 240.
  • FIG. 3 is a longitudinal sectional view of the document feeder 221.
  • a sheet feed port 222f and a sheet discharge port 222g arranged in the vertical direction are formed on the right side surface of the main body case 222.
  • a paper feed tray 223 and a paper discharge tray 228 are provided on the right side of the paper feed port 222f and the paper discharge port 222g, respectively.
  • a substantially U-shaped document conveyance path 225 extending from the paper feed port 222f to the paper discharge port 222g is formed.
  • a delivery roller 261, a feed roller 262, a pair of transport rollers 263, 264, 265, and a pair of discharge rollers 266 are provided in this order from the upstream side to the downstream side along the transport path 225. It is done.
  • the rollers 261 and 262 and the transport roller pairs 263 to 265 are arranged to extend in the front-rear direction.
  • An inner guide portion 270 and an outer guide portion 280 are provided on the side of the document conveyance path 225.
  • the inner guide portion 270 and the outer guide portion 280 are disposed to face each other with the document conveyance path 225 interposed therebetween.
  • the inner guide portion 270 and the outer guide portion 280 are disposed along the document conveyance path 225.
  • the inner guide portion 270 forms the inner wall surface of the U-shaped document conveyance path 225
  • the outer guide portion 280 forms the outer wall surface of the document conveyance path 225.
  • the feed roller 261 and the paper feed roller 262 are connected via a bracket 231.
  • the bracket portion 231 pivots around the support shaft 232 in the clockwise direction in the figure, whereby the delivery roller 261 abuts on the upper surface of the document.
  • Reference numeral 205 in FIG. 3 denotes a stopper that regulates the leading end position of the document placed on the document feed tray 223.
  • the document placed on the sheet feeding tray 223 is supplied to the document feeding path 225 by the feed roller 261 and the sheet feeding roller 262, and then the feed roller pair 263 is provided.
  • the paper is discharged onto the paper discharge tray 228 by the paper discharge roller pair 266 via the points 265 265 (see thick arrows in FIG. 3).
  • a first image reading position 226 and a second image reading position 227 for reading a document image in the flow reading mode are set.
  • the scanner unit 210 reads an image on the surface of the document.
  • the contact image sensor 211 is provided in the vicinity of the inner side of the document conveyance path 225.
  • the contact image sensor 211 is disposed such that the image reading surface thereof faces the document conveyance path 225 side.
  • the contact image sensor 211 is a light source (not shown) for emitting light toward the document passing through the document conveyance path 225, and arranged in the document width direction (a direction perpendicular to the document conveyance direction and the vertical direction in FIG. 3).
  • a plurality of light receiving elements are provided. Each light receiving element receives reflected light from a document and outputs an image signal having a size corresponding to the amount of light received.
  • the image signal output from each light receiving element is transmitted to the controller.
  • the controller generates image data of the back side of the document based on the image signals received from the light receiving elements.
  • the inner guide portion 270 has an upstream guide member 271 provided upstream of the transport roller pair 265 and a downstream guide member 272 provided downstream of the transport roller pair 265.
  • a recess 273 extending in the document width direction to accommodate the contact image sensor 211 is formed at the central portion of the upstream guide member 271 in the document conveyance direction.
  • the concave portion 273 is formed in a rectangular shape in cross section opened to the document conveyance path 225 side.
  • the recess 273 is formed over the entire document width direction of the upstream guide member 271.
  • the recess 273 is formed by a pair of vertical wall portions 271 e facing each other at intervals in the document conveyance direction and a bottom wall portion 271 f connecting lower ends of the vertical wall portions 271 e.
  • each protrusion 271 m is inserted into a groove 224 (see FIG. 9) formed on the opposing surface of the pair of side walls 222 e of the document feeding device 221. The details of the groove portion 224 will be described later.
  • Three upstream openings 271g and three downstream openings 271h are respectively formed on the upstream side and the downstream side of the concave portion 273 in the upstream guide member 271 in the document conveyance direction.
  • the drive roller 263a of the transport roller pair 263 is exposed from the upstream opening 271g, and the drive roller 264a of the transport roller pair 264 is exposed from the downstream opening 271h.
  • the open side of the recess 273 is closed by a contact glass 274 as a transparent glass plate. That is, the recess 273 is covered by the contact glass 274.
  • the contact glass 274 is formed of a rectangular plate material extending in the document width direction.
  • a biasing spring 276 is disposed between the contact image sensor 211 housed in the recess 273 and the bottom wall 271 f of the recess 273.
  • the biasing spring 276 is a compression coil spring and biases the contact image sensor 211 upward.
  • the biasing spring 276 presses the contact image sensor 211 against the lower surface of the contact glass 274 to bring it into close contact.
  • the contact glass 274 is supported by the L-shaped stepped portion 271a.
  • the stepped portions 271a are respectively formed at two open end portions located at the open side end of the concave portion 273 and opposed in the document conveyance direction.
  • Each stepped portion 271a has an abutting surface 271b abutting on the contact glass 274, and a vertical surface 271c formed perpendicular to the abutting surface 271b.
  • the contact surface 271 b is formed in parallel with the document conveyance surface 271 d of the upstream guide member 271.
  • the contact surface 271b is located lower than the document conveyance surface 271d by the thickness of the contact glass 274.
  • the vertical surface 271 c connects the contact surface 271 b and the document conveyance surface 271 d of the upstream guide member 271.
  • the document conveyance surface 271 d is a surface that forms the document conveyance path 225 and is a portion of the upper surface of the upstream guide member 271 located upstream and downstream of the recess 273.
  • the contact surface 271b functions as a positioning surface for positioning the contact glass 274 so that the document conveyance surface 271d and the upper surface of the contact glass 274 are flush (that is, the same height).
  • the contact glass 274 is pressed and fixed to the contact surface 271 b by a pair of detachable fixing members 275.
  • the pair of fixing members 275 respectively fix the longitudinal opposite end portions of the contact glass 274.
  • the fixing member 275 has a fixing plate portion 275a and a pair of leg portions 275b.
  • the fixing plate portion 275a is a plate portion that contacts the upper surface of the contact glass 274, and is formed in a U shape in plan view (see, for example, FIGS. 5 and 6).
  • the pair of legs 275 b extend downward from both ends of the fixed plate 275 a in the document conveyance direction.
  • the pair of leg portions 275b is configured to be flexible in the document conveyance direction (left and right direction in FIG.
  • the fixing member 275 is preferably made of a resin material in order to provide such flexibility.
  • An engagement claw portion 275c is formed at the lower end portion of each leg portion 275b. The engagement claws 275 c project inward from the inner surfaces of the pair of legs 275. The engagement claws 275c are engaged with engagement recesses 271k formed on the outer surfaces of the pair of vertical wall portions 271e.
  • the upstream guide member 271 is inserted from the upper side and set between the pair of side wall portions 222 e (see FIGS. 5 and 6) of the document feeding device 221.
  • grooves 224 are formed on the opposing surfaces of the pair of side walls 222 e (only the rear side wall 222 e is shown in FIG. 9).
  • the groove portion 224 extends substantially in the vertical direction.
  • the groove portion 224 has an insertion side guide portion 224a, a guide portion 224b, and a positioning portion 224c.
  • the insertion side guide part 224a is open to the upper side, and receives the protrusion 271m of the upstream side guide member 271 from the upper side.
  • the guide portion 224b is connected to the lower end portion of the insertion side guide portion 224a.
  • the guide portion 224b is disposed adjacent to the upper side of the positioning portion 224c.
  • the guide portion 224b is formed so that the groove width becomes narrower toward the lower side, as shown enlarged in FIG.
  • the guide portion 224b guides the projection 271m of the upstream guide member 271 received from the insertion side guide portion 224a to the positioning portion 224c.
  • the positioning portion 224 c is connected to the lower end of the guide portion 224 b.
  • the lower end side of the positioning portion 224c is closed.
  • the positioning portion 224 c engages with the projection (engaging portion) 271 m of the upstream guide member 271 to position the upstream guide member 271.
  • the upstream guide member 271 is inserted from the upper side between the pair of side wall portions 222e. At this time, the protrusion 271m formed on the upstream guide member 271 is inserted into the groove 224 formed on the inner side surface of the side wall 222e. Then, when the upstream guide member 271 is moved downward while being supported by hand, the protrusion 271m fits into the lower end portion (that is, the positioning portion 224c) of the groove portion 224. Then, the protrusion 271 m of the upstream guide member 271 is fitted (engaged) into the positioning portion 224 c to complete the positioning of the upstream guide member 271. In the present embodiment, as shown in FIG. 10, when the positioning of the upstream guide member 271 is completed, the outer periphery of the protrusion 271m is in point contact with the side wall of the groove portion 224.
  • the recess 273 for housing the contact image sensor 211 is integrally formed on the upstream guide member 271 forming the document conveyance path 225.
  • the positioning accuracy of the contact image sensor 211 with respect to the document conveyance path 225 can be improved as compared with the case where the sensor unit is separately provided.
  • contact surfaces 271b which are in contact with the contact glass 274 and position the contact glass 274 are formed at the open end side edge portions of the recess 273.
  • the contact glass 274 abuts on the contact surface 271, the surface of the contact glass 274 on the document conveyance path 225 side becomes flush with the document conveyance surface 271 d of the upstream guide member 271. Therefore, the contact glass 274 can be prevented from being disposed inward or outward of the conveyance path 225 with respect to the document conveyance surface 271 d of the upstream guide member 271.
  • the distance between the contact glass 274 and the document passing through the document conveyance path 225 can be maintained constant. Therefore, the reading accuracy of the document image by the contact image sensor 211 can be reliably improved.
  • the contact glass 274 is pressed and fixed to the contact surface 271 b by a detachable fixing member 275. Therefore, only by removing the fixing member 275, the cleaning operation in the recess 273 and the replacement operation of the contact image sensor 211 can be easily performed.
  • the contact image sensor 211 is biased upward by the biasing spring 276 and is in close contact with the contact glass 274.
  • the position of the contact image sensor 211 with respect to the contact glass 274 can be always maintained constant.
  • the position of the contact image sensor 211 with respect to the upstream guide member 271 supporting the contact glass 274 can always be maintained constant, and the variation in the position of the contact image sensor 211 with respect to the document conveyance path 225 can be made more reliably. It can be suppressed.
  • the groove portion 224 extending in the vertical direction is formed on the opposing surfaces of the pair of side wall portions 222 e of the document feeding device 221.
  • a positioning portion 224c which positions the upstream guide member 271 by engaging with a protrusion 271m formed on the upstream guide member 271.
  • the upstream guide member 271 can be set with high positional accuracy between the pair of side wall portions 222e, and the variation in the position of the document conveyance surface 271d of the upstream guide member 271 can be prevented. it can. Accordingly, it is possible to prevent the document being conveyed from being displaced in the thickness direction in the conveyance path 225 due to the gap of the document conveyance path 225 being too wide or the like. Therefore, the variation in the distance between the document being conveyed and the contact image sensor 211 can be further reliably suppressed.
  • a guide portion 224b whose groove width becomes narrower toward the lower side is formed.
  • the projection 271m can be smoothly guided to the positioning portion 224c by the guide portion 224b. Therefore, the setting operation of the upstream guide member 271 can be easily performed.
  • the protrusion 271m of the upstream guide member 271 is formed to point-contact with the side wall of the positioning portion 224c in a state engaged with the positioning portion 224c at the lower end portion of the groove portion 224.
  • the image forming apparatus 1 in the above-described embodiment is provided with the above-mentioned document feeding device 221. Therefore, the reading accuracy of the document image by the contact image sensor 211 is improved, so that the document image can be reproduced and printed on the sheet P by the image forming unit 20 with high accuracy.
  • the contact image sensor 211 is provided inside the document conveyance path 225.
  • the invention is not limited to this.
  • the contact image sensor 211 may be provided both inside and outside the document conveyance path 225 .
  • the contact glass 274 is fixed to the contact surface 271b by the detachable fixing member 275.
  • the present invention is not limited thereto. It may be fixed to
  • the contact surface 271b is configured to position the contact glass 274 so that the document conveyance surface 271d and the upper surface of the contact glass 274 are flush with each other. It is not That is, the contact surface 271b may be configured to position the contact glass 274 such that the document conveyance surface 271d is higher or lower than the upper surface of the contact glass 274d by a predetermined height.
  • the image forming apparatus 1 is a printer
  • the present invention is not limited to this, and the image forming apparatus 1 may be, for example, a facsimile, a copier, or a multifunction peripheral.
  • the present invention is useful for an image reading apparatus and an image forming apparatus provided with the image reading apparatus.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

A guide member (271) that forms a document conveying path has: a recess (273) that accommodates a contact image sensor (211) therein and is covered by a transparent glass plate (274); and a positioning surface (271b) that is formed on the peripheral edge of the opening side of the recess (273) and abuts the peripheral edge of the transparent glass plate (274), thereby positioning the transparent glass plate (274) such that the surface of the transparent glass plate (274) on the document conveying path side has a predetermined height with respect to a document conveying surface (271d) of the guide member. The guide member (271) is further provided with a detachable fixing member for pressing and immobilizing the transparent glass plate (274) against the positioning surface (271).

Description

画像読取装置及び該画像読取装置を備えた画像形成装置Image reading apparatus and image forming apparatus provided with the image reading apparatus
　本発明は、画像読取装置及び該画像読取装置を備えた画像形成装置に関する。 The present invention relates to an image reading apparatus and an image forming apparatus provided with the image reading apparatus.
　従来より、給紙トレイから搬送される原稿の画像をイメージセンサーにより読取り、該読取り後の原稿を排紙トレイに排出する画像読取装置は知られている。原稿搬送路は、該搬送路に沿って配置されたガイド板によって形成されている。上記イメージセンサーとしては例えばコンタクトイメージセンサー（ＣＩＳ(contact image sensor)とも言う）が使用される（例えば、特許文献１参照）。このコンタクトイメージセンサーは、一側面がコンタクトガラスで覆われた筐体の内部に収容されている。筐体は、コンタクトガラスが原稿搬送路に臨むように配置されている。筐体は、原稿搬送方向に相隣接するガイド板とガイド板との間に配置されている。 2. Description of the Related Art Conventionally, there is known an image reading apparatus which reads an image of a document conveyed from a paper feed tray by an image sensor and discharges the read document onto a paper discharge tray. The document transport path is formed by a guide plate disposed along the transport path. For example, a contact image sensor (also referred to as CIS (contact image sensor)) is used as the image sensor (see, for example, Patent Document 1). The contact image sensor is housed inside a housing covered on one side with a contact glass. The housing is disposed such that the contact glass faces the document conveyance path. The housing is disposed between a guide plate and a guide plate adjacent to each other in the document conveyance direction.
特開２００９－１４３６９６号公報JP, 2009-143696, A
　ところで、コンタクトイメージセンサーは被写界深度が狭いので、画像読取りを良好に行うためにコンタクトイメージセンサーと原稿搬送路を通過する原稿との距離を極力、一定に維持することが好ましい。 By the way, since the contact image sensor has a narrow depth of field, it is preferable to keep the distance between the contact image sensor and the document passing through the document conveyance path constant as much as possible in order to perform image reading well.
　しかしながら、上記特許文献１に示す画像読取装置では、その組立工程において、コンタクトイメージセンサーを収容する筐体の原稿搬送路に対する組付け位置がばらつく結果、コンタクトイメージセンサーと原稿との距離がばらついて画像読取りを良好に行うことができないという問題がある。 However, in the image reading apparatus disclosed in Patent Document 1, as a result of variations in the assembly position of the housing accommodating the contact image sensor with respect to the document conveyance path in the assembly process, the distance between the contact image sensor and the document varies There is a problem that the reading can not be performed well.
　本発明は、かかる点に鑑みてなされたものであり、その目的とするところは、コンタクトイメージセンサーの原稿搬送路に対する位置決め精度を向上させることにより、該コンタクトイメージセンサーによる原稿画像の読取り精度を向上させることにある。 The present invention has been made in view of such a point, and the object of the present invention is to improve the accuracy of reading a document image by the contact image sensor by improving the positioning accuracy of the contact image sensor with respect to the document conveyance path. It is to let
　本発明に係る画像読取装置は、原稿送り機構と、ガイド部材と、コンタクトイメージセンサーと、透明ガラス板とを備えている。原稿送り機構は、給紙トレイに載置された原稿を所定の原稿搬送路に沿って搬送して排紙トレイに排出する。ガイド部材は、上記所定の原稿搬送路に沿って配置されて該原稿搬送路を形成する。コンタクトイメージセンサーは、上記所定の原稿搬送路の側方に配置され、該所定の原稿搬送路を通過する原稿の画像を読取る。透明ガラス板は、該コンタクトイメージセンサーにおける原稿搬送路側を覆っている。 The image reading apparatus according to the present invention includes a document feeding mechanism, a guide member, a contact image sensor, and a transparent glass plate. The document feeding mechanism conveys a document placed on a paper feed tray along a predetermined document conveyance path and discharges the document onto a paper discharge tray. The guide member is disposed along the predetermined document conveyance path to form the document conveyance path. The contact image sensor is disposed to the side of the predetermined document conveyance path, and reads an image of a document passing through the predetermined document conveyance path. A transparent glass plate covers the document conveyance path side of the contact image sensor.
　そして、上記ガイド部材は、凹部と位置決め面とを有している。該凹部は、上記コンタクトイメージセンサーを内部に収容すると共に上記透明ガラス板によって覆われている。上記位置決め面は、該凹部の開放側の周縁部に形成され、上記透明ガラス板の周縁部に当接することにより、該透明ガラス板における原稿搬送路側の面が上記ガイド部材の原稿搬送面に対して所定高さになるように当該透明ガラスの位置決めを行うように構成されている。 The guide member has a recess and a positioning surface. The recess accommodates the contact image sensor and is covered by the transparent glass plate. The positioning surface is formed on the open peripheral edge of the recess, and by contacting the peripheral edge of the transparent glass plate, the surface of the transparent glass plate on the document transport path side faces the document transport surface of the guide member. The transparent glass is positioned to have a predetermined height.
　この構成によれば、原稿搬送路を形成するガイド部材にコンタクトイメージセンサーを収容する凹部を一体形成するようにしたことで、センサーユニットをガイド部材とは別体で構成した場合に比べて、原稿搬送路に対するコンタクトイメージセンサーの位置決め精度を向上させることができる。しかも、この凹部の開放側の周縁部には、該凹部を覆う透明ガラス板に当接する位置決め面が形成されている。透明ガラス板がこの位置決め面に当接することで、透明ガラス板の原稿搬送路側の面とガイド部材の原稿搬送面とが面一になる。これにより、透明ガラス板がガイド部材の原稿搬送面に対して搬送路内方側又は外方側にずれた状態で配置されるのを防止することができる。延いては、コンタクトイメージセンサーと原稿搬送路（コンタクトガラス上）を通過する原稿との距離を一定に維持することができる。よって、コンタクトイメージセンサーによる原稿画像の読取り精度をより一層向上させることができる。 According to this configuration, the concave portion for housing the contact image sensor is integrally formed in the guide member that forms the document conveyance path, so that the document can be compared to when the sensor unit is configured separately from the guide member. The positioning accuracy of the contact image sensor with respect to the transport path can be improved. In addition, a positioning surface that contacts the transparent glass plate that covers the recess is formed on the open-side peripheral edge of the recess. When the transparent glass plate abuts on the positioning surface, the surface of the transparent glass plate on the document conveyance path side becomes flush with the document conveyance surface of the guide member. Accordingly, it is possible to prevent the transparent glass plate from being disposed in a state in which the transparent glass plate is shifted inward or outward with respect to the document conveyance surface of the guide member. In addition, the distance between the contact image sensor and the document passing through the document conveyance path (on the contact glass) can be maintained constant. Therefore, the reading accuracy of the document image by the contact image sensor can be further improved.
　本発明に係る画像形成装置は、上記画像読取装置を備えている。 An image forming apparatus according to the present invention includes the above-described image reading apparatus.
　この構成によれば、コンタクトイメージセンサーによる原稿画像の読取り精度が向上するので、画像形成部によって原稿画像を用紙に精度良く再現印刷することができる。 According to this configuration, since the reading accuracy of the document image by the contact image sensor is improved, it is possible to reproduce and print the document image on the sheet with high accuracy by the image forming unit.
　本発明によれば、コンタクトイメージセンサーの原稿搬送路に対する位置決め精度を向上させることにより該コンタクトイメージセンサーによる原稿画像の読取り精度を向上させることができる。 According to the present invention, by improving the positioning accuracy of the contact image sensor with respect to the document conveyance path, it is possible to improve the reading accuracy of the document image by the contact image sensor.
図１は、実施形態における原稿給紙装置（画像読取装置に相当）を備えた画像形成装置の内部を示す概略図である。FIG. 1 is a schematic view showing the inside of an image forming apparatus provided with a document feeding device (corresponding to an image reading device) in the embodiment. 図２は、原稿給紙装置を示す外観斜視図である。FIG. 2 is an external perspective view showing the document feeder. 図３は、原稿給紙装置を示す概略の縦断面図である。FIG. 3 is a schematic vertical sectional view showing the document feeder. 図４は、原稿搬送路に沿って配置される内側ガイド部の上流側ガイド部材を示す外観斜視図である。FIG. 4 is an external perspective view showing the upstream guide member of the inner guide portion disposed along the document conveyance path. 図５は、原稿給紙装置の上部カバーを取外した状態を示す外観斜視図である。FIG. 5 is an external perspective view showing the document feeder with the upper cover removed. 図６は、原稿給紙装置の上部カバーを取外した状態を示す外観斜視図である。FIG. 6 is an external perspective view showing the document feeder with the upper cover removed. 図７は、図６のVII－VII線断面図である。7 is a cross-sectional view taken along line VII-VII of FIG. 図８は、図６のVIII－VIII線断面図である。FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 図９は、原稿給紙装置の一対の側壁部のうち画像形成装置の後側寄りに位置する側壁部を、一対の側壁部の内側から見た斜視図である。FIG. 9 is a perspective view of a side wall portion of the pair of side wall portions of the document feeding device, which is located closer to the rear side of the image forming apparatus, as viewed from the inside of the pair of side wall portions. 図１０は、図９のＸ方向矢視図であって、溝部の下端部に形成された位置決め部を拡大して示す拡大図である。FIG. 10 is a view as viewed in the direction of the arrow X in FIG. 9 and is an enlarged view showing a positioning portion formed at the lower end portion of the groove portion.
　以下、本発明の実施形態を図面に基づいて詳細に説明する。尚、本発明は、以下の実施形態に限定されるものではない。 Hereinafter, embodiments of the present invention will be described in detail based on the drawings. The present invention is not limited to the following embodiments.
　《実施形態》
　図１は、本実施形態における原稿給紙装置（画像読取装置に相当）２２１を備えた画像形成装置１を示している。画像形成装置１は、電子写真方式を利用したレーザープリンターである。画像形成装置１は、画像形成装置本体１００と、画像形成装置本体１００の上部に取り付けられた画像読取部２００と、ユーザーが操作可能な操作パネル２９０と、を備えている。尚、以下の説明において、前側、後側はそれぞれ、画像形成装置１の前側、後側（図１の左右方向の左側、右側）を意味し、左側、右側は、画像形成装置１を前側から見たときの左側、右側（図１の紙面垂直方向の手前側、奥側）を意味する。 << Embodiment >>
FIG. 1 shows an image forming apparatus 1 provided with a document feeding device (corresponding to an image reading device) 221 in the present embodiment. The image forming apparatus 1 is a laser printer using an electrophotographic method. The image forming apparatus 1 includes an image forming apparatus main body 100, an image reading unit 200 attached to the upper part of the image forming apparatus main body 100, and an operation panel 290 which can be operated by a user. In the following description, the front side and the rear side respectively mean the front side and the rear side (the left side and the right side in the left and right direction of FIG. 1) of the image forming apparatus 1, and the left side and the right mean the image forming apparatus 1 from the front side. When viewed, it means the left side and the right side (front side and back side in the direction perpendicular to the paper surface of FIG. 1).
　画像形成装置本体１００は箱状の筐体６０を有している。筐体６０の上部には画像読取部２００が設けられている。上記筐体６０内には、給紙部１０、画像形成部２０、定着部４０が収容されている。給紙部１０から排紙トレイ部５０に至る用紙搬送路Ｌには、用紙Ｐを挟持して搬送する複数の搬送ローラー対１１～１３が配置されている。また、筐体６０内には、用紙搬送路Ｌの下流側から分岐して上流側に合流する反転搬送路Ｌ´が設けられている。反転搬送路Ｌ´には搬送ローラー対１４～１６が配置されている。 The image forming apparatus main body 100 has a box-like case 60. An image reading unit 200 is provided on the top of the case 60. In the housing 60, a sheet feeding unit 10, an image forming unit 20, and a fixing unit 40 are accommodated. In the sheet conveyance path L from the sheet feed unit 10 to the sheet discharge tray unit 50, a plurality of conveyance roller pairs 11 to 13 which sandwich and convey the sheet P are disposed. Further, in the housing 60, a reverse conveyance path L ′ is provided which branches from the downstream side of the sheet conveyance path L and joins on the upstream side. Conveying roller pairs 14 to 16 are disposed in the reverse conveying path L ′.
　上記給紙部１０は、筐体６０内の下部に配置されている。給紙部１０は、シート状の用紙Ｐが収容される給紙カセット１０ａと、該給紙カセット１０ａ内の用紙Ｐを取り出して該カセット外に送り出すためのピックアップローラー１０ｂとを有している。給紙カセット１０ａよりカセット外に送り出された用紙Ｐは、搬送ローラー対１１を介して画像形成部２０に供給される。 The sheet feeding unit 10 is disposed at a lower portion in the housing 60. The sheet feeding unit 10 has a sheet feeding cassette 10a in which sheet-like sheets P are stored, and a pickup roller 10b for taking out the sheets P in the sheet feeding cassette 10a and feeding the sheet P out of the cassette. The sheet P fed out of the cassette from the sheet feeding cassette 10 a is supplied to the image forming unit 20 via the conveyance roller pair 11.
　画像形成部２０では、ブラック、マゼンタ、シアンおよびイエローの各色にそれぞれ対応するトナー画像を形成する作像ユニット２０Ｂｋ、２０Ｍ、２０Ｃ、２０Ｙが一列に配置されている。各作像ユニット２０Ｂｋ、２０Ｍ、２０Ｃ、２０Ｙは、感光体ドラム２１、帯電装置２２、現像装置２３およびクリーニング装置２４を備えている。作像ユニット２０Ｂｋ、２０Ｍ、２０Ｃ、２０Ｙの下方には、各感光体ドラム２１の表面にレーザー光を照射する露光装置２５が配置されている。また、作像ユニット２０Ｂｋ、２０Ｍ、２０Ｃ、２０Ｙの上側には、中間転写ユニット２６が配置されている。中間転写ユニット２６には、各感光体ドラム２１に接して走行する中間転写ベルト２７が設けられている。中間転写ベルト２７の内側には感光体ドラム２１との間で中間転写ベルト２７を挟み込むように、一次転写ローラー２８が設けられている。また、作像ユニット２０Ｂｋの下流側には、中間転写ベルト２７の表面に接触するように二次転写ローラー２９が設けられている。中間転写ユニット２６の上側には、トナーコンテナ３０Ｂｋ、３０Ｍ、３０Ｃ、３０Ｙが配置されている。トナーコンテナ３０Ｂｋ、３０Ｍ、３０Ｃ、３０Ｙには、作像ユニット２０Ｂｋ、２０Ｍ、２０Ｃ、２０Ｙの各現像装置２３に補給される各色のトナーが収納されている。 In the image forming unit 20, image forming units 20Bk, 20M, 20C and 20Y for forming toner images corresponding to the respective colors of black, magenta, cyan and yellow are arranged in a line. Each of the image forming units 20Bk, 20M, 20C, and 20Y includes a photosensitive drum 21, a charging device 22, a developing device 23, and a cleaning device 24. Under the image forming units 20Bk, 20M, 20C, and 20Y, an exposure device 25 that irradiates the surface of each photosensitive drum 21 with a laser beam is disposed. An intermediate transfer unit 26 is disposed above the image forming units 20Bk, 20M, 20C, and 20Y. The intermediate transfer unit 26 is provided with an intermediate transfer belt 27 traveling in contact with each photosensitive drum 21. A primary transfer roller 28 is provided inside the intermediate transfer belt 27 so as to sandwich the intermediate transfer belt 27 with the photosensitive drum 21. Further, on the downstream side of the image forming unit 20Bk, a secondary transfer roller 29 is provided in contact with the surface of the intermediate transfer belt 27. Above the intermediate transfer unit 26, toner containers 30Bk, 30M, 30C, and 30Y are disposed. In the toner containers 30Bk, 30M, 30C and 30Y, toners of respective colors to be supplied to the respective developing devices 23 of the image forming units 20Bk, 20M, 20C and 20Y are stored.
　画像形成部２０では、露光装置２５によって各感光体ドラム２１の表面に所定の画像データ（本実施形態では、画像読取部２００により読み込んだ原稿画像データ）に基づくレーザー光を照射することで静電潜像を形成する。画像形成部２０は、この形成した静電潜像を現像装置２３によって現像することで各色のトナー像を形成する。各感光体ドラム２１の表面に形成された各色のトナー像は、一次転写ローラー２８によって中間転写ベルト２７の表面に転写されて重ね合わせられる。そして、中間転写ベルト２７上に転写されたトナー像は二次転写ローラー２９によって、給紙部１０より供給された用紙Ｐに対して転写される。該転写後の用紙Ｐは定着部４０に供給される。定着部４０では、画像形成部２０より供給される用紙Ｐを定着ローラー４０ａ及び加圧ローラー４０ｂ間で加圧することにより、当該用紙Ｐにトナー像を定着させる。そして、定着部４０にてトナー像が定着された用紙Ｐは、両ローラー４０ａ，４０ｂにより下流側へと送り出される。定着部４０より送り出された用紙Ｐは、搬送ローラー対１３を介して上記排紙トレイ部５０に排出される。また、用紙Ｐの両面にトナー像を形成する場合には、搬送ローラー対１３によって用紙Ｐはスイッチバックされて、反転搬送路Ｌ´に搬送される。　 In the image forming unit 20, the exposure device 25 irradiates the surface of each photosensitive drum 21 with laser light based on predetermined image data (in the present embodiment, document image data read by the image reading unit 200). Form a latent image. The image forming unit 20 develops the formed electrostatic latent image by the developing device 23 to form a toner image of each color. The toner images of the respective colors formed on the surfaces of the photosensitive drums 21 are transferred onto the surface of the intermediate transfer belt 27 by the primary transfer roller 28 and superimposed. Then, the toner image transferred onto the intermediate transfer belt 27 is transferred by the secondary transfer roller 29 onto the sheet P supplied from the sheet feeding unit 10. The sheet P after the transfer is supplied to the fixing unit 40. The fixing unit 40 fixes the toner image on the sheet P by pressing the sheet P supplied from the image forming unit 20 between the fixing roller 40 a and the pressure roller 40 b. Then, the sheet P on which the toner image is fixed by the fixing unit 40 is sent to the downstream side by both the rollers 40 a and 40 b. The sheet P fed from the fixing unit 40 is discharged to the sheet discharge tray unit 50 through the conveyance roller pair 13. When toner images are formed on both sides of the sheet P, the sheet P is switched back by the transport roller pair 13 and transported to the reverse transport path L ′.
　上記画像読取部２００は、略直方体状のケース体２５０と、原稿押さえカバー２４０と、原稿給紙装置２２１とを有している。ケース体２５０の上面は、原稿が載置される原稿載置面２５０ａを形成している。画像読取部２００は、原稿載置面２５０ａに載置された原稿の画像を読取る固定読取りモードと、原稿給紙装置２２１により原稿を一枚ずつ連続的に供給しながらその画像を読取る流し読みモードとを備えている。上記ケース体２５０の内部にはスキャナ部２１０（図３参照）が収容されている。スキャナ部２１０は、固定読取りモードにおいては原稿載置面２５０ａに載置された原稿画像を光学的に読取り、流し読みモードにおいては原稿の表面の画像を光学的に読み取ってその画像データを生成する。スキャナ部２１０は、例えば、反射ミラー、ＣＣＤセンサー等により構成されている。上記原稿押さえカバー２４０は、上記原稿載置面２５０ａを開閉可能に覆っている。原稿押さえカバー２４０は、不図示のヒンジ機構を介してケース体２５０に回動可能に取付けられている。 The image reading unit 200 includes a substantially rectangular case body 250, a document pressing cover 240, and a document feeding device 221. The upper surface of the case body 250 forms a document placement surface 250a on which a document is placed. The image reading unit 200 has a fixed reading mode for reading an image of a document placed on the document placement surface 250 a and a flow reading mode for reading the image while feeding a document one by one continuously by the document feeding device 221. And have. The scanner unit 210 (see FIG. 3) is housed inside the case body 250. The scanner unit 210 optically reads an image of a document placed on the document placement surface 250 a in the fixed reading mode, and optically reads an image on the surface of the document in the flow reading mode to generate image data thereof. . The scanner unit 210 is configured of, for example, a reflection mirror, a CCD sensor, or the like. The document pressing cover 240 covers the document placement surface 250 a so as to be openable and closable. The document pressing cover 240 is rotatably attached to the case body 250 via a hinge mechanism (not shown).
　上記原稿給紙装置２２１は原稿押さえカバー２４０の上面側に設けられている。図２に示すように、原稿給紙装置２２１は、本体ケース２２２を有している。本体ケース２２２は、原稿押さえカバー２４０の上面側の左側端部に設けられている。本体ケース２２２は、一対の側壁部２２２ｅと、開閉可能な上部カバー２２２ｋとを有している。上記本体ケース２２２の下面は原稿押さえカバー２４０の上面により構成されている。上記一対の側壁部２２２ｅは、原稿給紙装置２２１内に設けられた原稿搬送路２２５（図３参照）を挟んで前後方向において対向配置されている。一対の側壁部２２２ｅは、原稿押さえカバー２４０の上面に固定されている。 The document feeding device 221 is provided on the upper surface side of the document pressing cover 240. As shown in FIG. 2, the document feeder 221 has a main body case 222. The main body case 222 is provided at the left end of the upper surface side of the document pressing cover 240. The main body case 222 has a pair of side wall portions 222 e and an openable and closable upper cover 222 k. The lower surface of the main body case 222 is constituted by the upper surface of the document pressing cover 240. The pair of side wall portions 222 e are disposed opposite to each other in the front-rear direction across a document conveyance path 225 (see FIG. 3) provided in the document feeding device 221. The pair of side wall portions 222 e is fixed to the upper surface of the document pressing cover 240.
　図３は、原稿給紙装置２２１の縦断面図である。同図に示すように、本体ケース２２２の右側面には、上下方向に並ぶ給紙口２２２ｆ及び排紙口２２２ｇが形成されている。給紙口２２２ｆ及び排紙口２２２ｇの右側にはそれぞれ、給紙トレイ２２３及び排紙トレイ２２８が設けられている。本体ケース２２２内には、給紙口２２２ｆから排紙口２２２ｇに至る略Ｕ字状の原稿搬送路２２５が形成されている。本体ケース２２２内には、この搬送路２２５に沿って上流側から下流側に向かって順に、送出しローラー２６１、給紙ローラー２６２、搬送ローラー対２６３，２６４，２６５及び排紙ローラー対２６６が設けられている。これらローラー２６１,２６２及び搬送ローラー対２６３～２６５は、前後方向に延びるように配置されている。原稿搬送路２２５の側方には、内側ガイド部２７０及び外側ガイド部２８０が設けられている。内側ガイド部２７０及び外側ガイド部２８０は、原稿搬送路２２５を挟んで対向して配置されている。内側ガイド部２７０及び外側ガイド部２８０は、原稿搬送路２２５に沿って配置されている。内側ガイド部２７０はＵ字状の原稿搬送路２２５の内側壁面を形成し、外側ガイド部２８０は該原稿搬送路２２５の外側壁面を形成している。 FIG. 3 is a longitudinal sectional view of the document feeder 221. As shown in FIG. As shown in the figure, on the right side surface of the main body case 222, a sheet feed port 222f and a sheet discharge port 222g arranged in the vertical direction are formed. A paper feed tray 223 and a paper discharge tray 228 are provided on the right side of the paper feed port 222f and the paper discharge port 222g, respectively. In the main body case 222, a substantially U-shaped document conveyance path 225 extending from the paper feed port 222f to the paper discharge port 222g is formed. In the main body case 222, a delivery roller 261, a feed roller 262, a pair of transport rollers 263, 264, 265, and a pair of discharge rollers 266 are provided in this order from the upstream side to the downstream side along the transport path 225. It is done. The rollers 261 and 262 and the transport roller pairs 263 to 265 are arranged to extend in the front-rear direction. An inner guide portion 270 and an outer guide portion 280 are provided on the side of the document conveyance path 225. The inner guide portion 270 and the outer guide portion 280 are disposed to face each other with the document conveyance path 225 interposed therebetween. The inner guide portion 270 and the outer guide portion 280 are disposed along the document conveyance path 225. The inner guide portion 270 forms the inner wall surface of the U-shaped document conveyance path 225, and the outer guide portion 280 forms the outer wall surface of the document conveyance path 225.
　送出しローラー２６１と給紙ローラー２６２とはブラケット２３１を介して連結されている。給紙動作時には、ブラケット部２３１が支持シャフト２３２回りに図の時計回り方向に回動することで、送出しローラー２６１が原稿の上面に当接するようになっている。尚、図３中の符号２０５は、原稿給紙トレイ２２３に載置された原稿の先端位置を規制するストッパーである。 The feed roller 261 and the paper feed roller 262 are connected via a bracket 231. At the time of sheet feeding operation, the bracket portion 231 pivots around the support shaft 232 in the clockwise direction in the figure, whereby the delivery roller 261 abuts on the upper surface of the document. Reference numeral 205 in FIG. 3 denotes a stopper that regulates the leading end position of the document placed on the document feed tray 223.
　上記原稿給紙装置２２１の給紙動作が開始すると、給紙トレイ２２３に載置された原稿が、送出しローラー２６１及び給紙ローラー２６２によって原稿搬送路２２５に供給された後、搬送ローラー対２６３～２６５を経由して排紙ローラー対２６６によって排紙トレイ２２８に排出される（図３の太矢印参照）。原稿搬送路２２５の途中には、上記流し読みモードにおいて原稿画像を読み取るための第１画像読取位置２２６及び第２画像読取位置２２７が設定されている。第１画像読取位置２２６では、コンタクトイメージセンサー（Contact Image Sensor）２１１により原稿の裏面の画像が読取られる。第２画像読取位置２２７では、上記スキャナ部２１０により原稿の表面の画像が読取られる。 When the sheet feeding operation of the document feeding device 221 is started, the document placed on the sheet feeding tray 223 is supplied to the document feeding path 225 by the feed roller 261 and the sheet feeding roller 262, and then the feed roller pair 263 is provided. The paper is discharged onto the paper discharge tray 228 by the paper discharge roller pair 266 via the points 265 265 (see thick arrows in FIG. 3). In the middle of the document conveyance path 225, a first image reading position 226 and a second image reading position 227 for reading a document image in the flow reading mode are set. At the first image reading position 226, the image on the back side of the document is read by the contact image sensor 211. At the second image reading position 227, the scanner unit 210 reads an image on the surface of the document.
　コンタクトイメージセンサー２１１は、原稿搬送路２２５の内側近傍に設けられている。コンタクトイメージセンサー２１１は、その画像読取面が原稿搬送路２２５側を向くように配置されている。コンタクトイメージセンサー２１１は、原稿搬送路２２５を通過する原稿に向けて光を出射する光源（図示省略）と、原稿幅方向（原稿搬送方向に直交する方向あって図３の紙面垂直方向）に並ぶ複数の受光素子（図示省略）とを有している。各受光素子は、原稿からの反射光を受光して、その受光量に応じた大きさの画像信号を出力する。各受光素子から出力された画像信号はコントローラーに送信される。コントローラーでは、各受光素子から受信した画像信号を基に原稿の裏面の画像データを生成する。 The contact image sensor 211 is provided in the vicinity of the inner side of the document conveyance path 225. The contact image sensor 211 is disposed such that the image reading surface thereof faces the document conveyance path 225 side. The contact image sensor 211 is a light source (not shown) for emitting light toward the document passing through the document conveyance path 225, and arranged in the document width direction (a direction perpendicular to the document conveyance direction and the vertical direction in FIG. 3). A plurality of light receiving elements (not shown) are provided. Each light receiving element receives reflected light from a document and outputs an image signal having a size corresponding to the amount of light received. The image signal output from each light receiving element is transmitted to the controller. The controller generates image data of the back side of the document based on the image signals received from the light receiving elements.
　上記内側ガイド部２７０は、搬送ローラー対２６５よりも上流側に設けられた上流側ガイド部材２７１と該搬送ローラー対２６５よりも下流側に設けられた下流側ガイド部材２７２とを有している。 The inner guide portion 270 has an upstream guide member 271 provided upstream of the transport roller pair 265 and a downstream guide member 272 provided downstream of the transport roller pair 265.
　図４に示すように、上流側ガイド部材２７１の原稿搬送方向の中央部には、原稿幅方向に延びて上記コンタクトイメージセンサー２１１を収容する凹部２７３が形成されている。凹部２７３は、原稿搬送路２２５側に開放する断面矩形状に形成されている。凹部２７３は、上流側ガイド部材２７１における原稿幅方向の全体に亘って形成されている。詳しくは、凹部２７３は、原稿搬送方向において間隔を空けて対向する一対の縦壁部２７１ｅと該縦壁部２７１ｅの下端部同士を連結する底壁部２７１ｆとによって形成されている。上流側ガイド部材２７１における原稿幅方向の両端部には、該原稿幅方向の外側に突出する突部２７１ｍが形成されている。各突部２７１ｍは、原稿給紙装置２２１の一対の側壁部２２２ｅの互いの対向面に形成された溝部２２４（図９参照）に挿入される。溝部２２４の詳細については後述する。 As shown in FIG. 4, a recess 273 extending in the document width direction to accommodate the contact image sensor 211 is formed at the central portion of the upstream guide member 271 in the document conveyance direction. The concave portion 273 is formed in a rectangular shape in cross section opened to the document conveyance path 225 side. The recess 273 is formed over the entire document width direction of the upstream guide member 271. Specifically, the recess 273 is formed by a pair of vertical wall portions 271 e facing each other at intervals in the document conveyance direction and a bottom wall portion 271 f connecting lower ends of the vertical wall portions 271 e. At both end portions of the upstream guide member 271 in the document width direction, protrusions 271m that protrude outward in the document width direction are formed. Each protrusion 271 m is inserted into a groove 224 (see FIG. 9) formed on the opposing surface of the pair of side walls 222 e of the document feeding device 221. The details of the groove portion 224 will be described later.
　上記上流側ガイド部材２７１における凹部２７３よりも原稿搬送方向の上流側及び下流側にはそれぞれ、上流側開口部２７１ｇ及び下流側開口部２７１ｈが３つずつ形成されている。図５及び図６に示すように、上流側開口部２７１ｇからは搬送ローラー対２６３の駆動ローラー２６３ａが露出し、下流側開口部２７１ｈからは搬送ローラー対２６４の駆動ローラー２６４ａが露出している。上記凹部２７３の開放側は、透明ガラス板としてのコンタクトガラス２７４により閉塞されている。すなわち、凹部２７３は、コンタクトガラス２７４により覆われている。コンタクトガラス２７４は、原稿幅方向に延びる長方形状の板材で構成されている。 Three upstream openings 271g and three downstream openings 271h are respectively formed on the upstream side and the downstream side of the concave portion 273 in the upstream guide member 271 in the document conveyance direction. As shown in FIGS. 5 and 6, the drive roller 263a of the transport roller pair 263 is exposed from the upstream opening 271g, and the drive roller 264a of the transport roller pair 264 is exposed from the downstream opening 271h. The open side of the recess 273 is closed by a contact glass 274 as a transparent glass plate. That is, the recess 273 is covered by the contact glass 274. The contact glass 274 is formed of a rectangular plate material extending in the document width direction.
　図７に示すように、凹部２７３内に収容されたコンタクトイメージセンサー２１１と凹部２７３の底壁部２７１ｆとの間には、付勢バネ２７６が配置されている。付勢バネ２７６は、圧縮コイルバネからなり、コンタクトイメージセンサー２１１を上側に付勢している。そして、付勢バネ２７６は、コンタクトイメージセンサー２１１をコンタクトガラス２７４の下面に押付けて密着させている。 As shown in FIG. 7, a biasing spring 276 is disposed between the contact image sensor 211 housed in the recess 273 and the bottom wall 271 f of the recess 273. The biasing spring 276 is a compression coil spring and biases the contact image sensor 211 upward. The biasing spring 276 presses the contact image sensor 211 against the lower surface of the contact glass 274 to bring it into close contact.
　上記コンタクトガラス２７４はＬ字状の段差部２７１ａに支持されている。段差部２７１ａは、凹部２７３の開放側端に位置し且つ原稿搬送方向において対向する２つの縁部にそれぞれ形成されている。各段差部２７１ａは、コンタクトガラス２７４に当接する当接面２７１ｂと、該当接面２７１ｂに対して垂直に形成された垂直面２７１ｃと、を有している。当接面２７１ｂは、上流側ガイド部材２７１の原稿搬送面２７１ｄと平行に形成されている。当接面２７１ｂは、原稿搬送面２７１ｄよりもコンタクトガラス２７４の厚さ分だけ下側に位置している。垂直面２７１ｃは、該当接面２７１ｂと上流側ガイド部材２７１の原稿搬送面２７１ｄとを接続する。原稿搬送面２７１ｄは、原稿搬送路２２５を形成する面であって、上流側ガイド部材２７１の上面のうち凹部２７３よりも上流側及び下流側に位置する部分からなる。上記当接面２７１ｂは、この原稿搬送面２７１ｄと上記コンタクトガラス２７４の上面とが面一（つまり同じ高さ）になるように、コンタクトガラス２７４の位置決めを行う位置決め面として機能する。 The contact glass 274 is supported by the L-shaped stepped portion 271a. The stepped portions 271a are respectively formed at two open end portions located at the open side end of the concave portion 273 and opposed in the document conveyance direction. Each stepped portion 271a has an abutting surface 271b abutting on the contact glass 274, and a vertical surface 271c formed perpendicular to the abutting surface 271b. The contact surface 271 b is formed in parallel with the document conveyance surface 271 d of the upstream guide member 271. The contact surface 271b is located lower than the document conveyance surface 271d by the thickness of the contact glass 274. The vertical surface 271 c connects the contact surface 271 b and the document conveyance surface 271 d of the upstream guide member 271. The document conveyance surface 271 d is a surface that forms the document conveyance path 225 and is a portion of the upper surface of the upstream guide member 271 located upstream and downstream of the recess 273. The contact surface 271b functions as a positioning surface for positioning the contact glass 274 so that the document conveyance surface 271d and the upper surface of the contact glass 274 are flush (that is, the same height).
　図８に示すように、上記コンタクトガラス２７４は、着脱式の一対の固定部材２７５により上記当接面２７１ｂに押し付けて固定されている。一対の固定部材２７５はそれぞれコンタクトガラス２７４の長手方向の両端部を固定している。上記固定部材２７５は、固定板部２７５ａと一対の脚部２７５ｂを有している。固定板部２７５ａは、コンタクトガラス２７４の上面に当接する板部であって平面視でコ字状に形成されている（例えば図５及び図６参照）。一対の脚部２７５ｂは、固定板部２７５ａの原稿搬送方向の両端部からそれぞれ下方に延びている。一対の脚部２７５ｂは、その基端部（固定部材２７５との接続部）を支点として原稿搬送方向（図８の左右方向）に可撓可能に構成されている。固定部材２７５は、このような可撓性を持たせるために樹脂材で構成されることが好ましい。各脚部２７５ｂの下端部には係合爪部２７５ｃが形成されている。各係合爪部２７５ｃは、一対の脚部２７５の互いの内側面から該内側に突出している。係合爪部２７５ｃは、上記一対の縦壁部２７１ｅの互いの外側面に形成された係合凹部２７１ｋに係合している。 As shown in FIG. 8, the contact glass 274 is pressed and fixed to the contact surface 271 b by a pair of detachable fixing members 275. The pair of fixing members 275 respectively fix the longitudinal opposite end portions of the contact glass 274. The fixing member 275 has a fixing plate portion 275a and a pair of leg portions 275b. The fixing plate portion 275a is a plate portion that contacts the upper surface of the contact glass 274, and is formed in a U shape in plan view (see, for example, FIGS. 5 and 6). The pair of legs 275 b extend downward from both ends of the fixed plate 275 a in the document conveyance direction. The pair of leg portions 275b is configured to be flexible in the document conveyance direction (left and right direction in FIG. 8) with the base end portion (the connection portion with the fixing member 275) as a fulcrum. The fixing member 275 is preferably made of a resin material in order to provide such flexibility. An engagement claw portion 275c is formed at the lower end portion of each leg portion 275b. The engagement claws 275 c project inward from the inner surfaces of the pair of legs 275. The engagement claws 275c are engaged with engagement recesses 271k formed on the outer surfaces of the pair of vertical wall portions 271e.
　上流側ガイド部材２７１は、原稿給紙装置２２１の一対の側壁部２２２ｅ（図５及び図６参照）の間に上側から挿入されてセットされる。図９に示すように、一対の側壁部２２２ｅ（図９では、後側の側壁部２２２ｅのみを示す）の互いの対向面には溝部２２４が形成されている。溝部２２４は、略上下方向に延びている。溝部２２４は、挿入側ガイド部２２４ａと案内部２２４ｂと位置決め部２２４ｃとを有している。挿入側ガイド部２２４ａは、上側に開放していて、上流側ガイド部材２７１の突部２７１ｍを上側から受け入れる。案内部２２４ｂは、挿入側ガイド部２２４ａの下端部に接続されている。案内部２２４ｂは、位置決め部２２４ｃの上側に隣接して配置されている。案内部２２４ｂは、図１０に拡大して示すように、下側ほど溝幅が狭くなるように形成されている。案内部２２４ｂは、挿入側ガイド部２２４ａより受け入れた上流側ガイド部材２７１の突部２７１ｍを位置決め部２２４ｃへと案内する。位置決め部２２４ｃは、案内部２２４ｂの下端に接続されている。位置決め部２２４ｃの下端側は閉塞されている。そして、位置決め部２２４ｃは、上流側ガイド部材２７１の突部（係合部）２７１ｍに係合して該上流側ガイド部材２７１の位置決めを行う。 The upstream guide member 271 is inserted from the upper side and set between the pair of side wall portions 222 e (see FIGS. 5 and 6) of the document feeding device 221. As shown in FIG. 9, grooves 224 are formed on the opposing surfaces of the pair of side walls 222 e (only the rear side wall 222 e is shown in FIG. 9). The groove portion 224 extends substantially in the vertical direction. The groove portion 224 has an insertion side guide portion 224a, a guide portion 224b, and a positioning portion 224c. The insertion side guide part 224a is open to the upper side, and receives the protrusion 271m of the upstream side guide member 271 from the upper side. The guide portion 224b is connected to the lower end portion of the insertion side guide portion 224a. The guide portion 224b is disposed adjacent to the upper side of the positioning portion 224c. The guide portion 224b is formed so that the groove width becomes narrower toward the lower side, as shown enlarged in FIG. The guide portion 224b guides the projection 271m of the upstream guide member 271 received from the insertion side guide portion 224a to the positioning portion 224c. The positioning portion 224 c is connected to the lower end of the guide portion 224 b. The lower end side of the positioning portion 224c is closed. The positioning portion 224 c engages with the projection (engaging portion) 271 m of the upstream guide member 271 to position the upstream guide member 271.
　上流側ガイド部材２７１のセット作業では、先ず、上流側ガイド部材２７１を一対の側壁部２２２ｅの間に上側から挿入する。このとき、上流側ガイド部材２７１に形成された突部２７１ｍを側壁部２２２ｅの内側面に形成された溝部２２４に挿入する。そして、上流側ガイド部材２７１を手で支えながら徐々に下側に移動させて行くと突部２７１ｍが溝部２２４の下端部（つまり位置決め部２２４ｃ）に嵌り込む。そうして、上流側ガイド部材２７１の突部２７１ｍが位置決め部２２４ｃに嵌り込む（係合する）ことで上流側ガイド部材２７１の位置決めが完了する。本実施形態では、図１０に示すように、上流側ガイド部材２７１の位置決めが完了した状態では、突部２７１ｍの外周が溝部２２４の側壁に点接触した状態になる。 In the setting operation of the upstream guide member 271, first, the upstream guide member 271 is inserted from the upper side between the pair of side wall portions 222e. At this time, the protrusion 271m formed on the upstream guide member 271 is inserted into the groove 224 formed on the inner side surface of the side wall 222e. Then, when the upstream guide member 271 is moved downward while being supported by hand, the protrusion 271m fits into the lower end portion (that is, the positioning portion 224c) of the groove portion 224. Then, the protrusion 271 m of the upstream guide member 271 is fitted (engaged) into the positioning portion 224 c to complete the positioning of the upstream guide member 271. In the present embodiment, as shown in FIG. 10, when the positioning of the upstream guide member 271 is completed, the outer periphery of the protrusion 271m is in point contact with the side wall of the groove portion 224.
　以上説明したように上記実施形態では、原稿搬送路２２５を形成する上流側ガイド部材２７１にコンタクトイメージセンサー２１１を収容するための凹部２７３を一体形成するようにしたので、上流側ガイド部材２７１とは別体でセンサーユニットを設けるようにした場合に比べて、原稿搬送路２２５に対するコンタクトイメージセンサー２１１の位置決め精度を向上させることができる。 As described above, in the above embodiment, the recess 273 for housing the contact image sensor 211 is integrally formed on the upstream guide member 271 forming the document conveyance path 225. The positioning accuracy of the contact image sensor 211 with respect to the document conveyance path 225 can be improved as compared with the case where the sensor unit is separately provided.
　しかも、上記凹部２７３部の開放側の一対の端縁部にはそれぞれ、コンタクトガラス２７４に当接して該コンタクトガラス２７４の位置決め行う当接面２７１ｂが形成されている。この当接面２７１にコンタクトガラス２７４が当接することにより、コンタクトガラス２７４の原稿搬送路２２５側の面が上流側ガイド部材２７１の原稿搬送面２７１ｄと面一になる。したがって、コンタクトガラス２７４が上流側ガイド部材２７１の原稿搬送面２７１ｄよりも搬送路２２５の内方側又は外方側にずれた状態で配置されるのを防止することができる。延いては、コンタクトガラス２７４と、原稿搬送路２２５を通過する原稿との距離を一定に維持することができる。よって、コンタクトイメージセンサー２１１による原稿画像の読取り精度を確実に向上させることができる。 In addition, contact surfaces 271b which are in contact with the contact glass 274 and position the contact glass 274 are formed at the open end side edge portions of the recess 273. When the contact glass 274 abuts on the contact surface 271, the surface of the contact glass 274 on the document conveyance path 225 side becomes flush with the document conveyance surface 271 d of the upstream guide member 271. Therefore, the contact glass 274 can be prevented from being disposed inward or outward of the conveyance path 225 with respect to the document conveyance surface 271 d of the upstream guide member 271. As a result, the distance between the contact glass 274 and the document passing through the document conveyance path 225 can be maintained constant. Therefore, the reading accuracy of the document image by the contact image sensor 211 can be reliably improved.
　さらに、コンタクトガラス２７４は着脱式の固定部材２７５によって上記当接面２７１ｂに押付けて固定されている。したがって、この固定部材２７５を取外すだけで凹部２７３内の清掃作業やコンタクトイメージセンサー２１１の交換作業を容易に行うことができる。 Further, the contact glass 274 is pressed and fixed to the contact surface 271 b by a detachable fixing member 275. Therefore, only by removing the fixing member 275, the cleaning operation in the recess 273 and the replacement operation of the contact image sensor 211 can be easily performed.
　さらに上記実施形態では、コンタクトイメージセンサー２１１は、付勢バネ２７６により上側に付勢されて上記コンタクトガラス２７４に密着している。 Further, in the above embodiment, the contact image sensor 211 is biased upward by the biasing spring 276 and is in close contact with the contact glass 274.
　したがって、コンタクトガラス２７４に対するコンタクトイメージセンサー２１１の位置を常に一定に維持することができる。延いては、コンタクトガラス２７４を支持する上流側ガイド部材２７１に対するコンタクトイメージセンサー２１１の位置を常に一定に維持することができ、原稿搬送路２２５に対するコンタクトイメージセンサー２１１の位置のばらつきをより一層確実に抑制することができる。 Therefore, the position of the contact image sensor 211 with respect to the contact glass 274 can be always maintained constant. In other words, the position of the contact image sensor 211 with respect to the upstream guide member 271 supporting the contact glass 274 can always be maintained constant, and the variation in the position of the contact image sensor 211 with respect to the document conveyance path 225 can be made more reliably. It can be suppressed.
　さらに上記実施形態では、原稿給紙装置２２１の一対の側壁部２２２ｅの互いの対向面に上下方向に延びる溝部２２４を形成するようにしている。この溝部２２４の下端部には、上流側ガイド部材２７１に形成された突部２７１ｍに係合することで当該上流側ガイド部材２７１の位置決めを行う位置決め部２２４ｃが形成されている。 Further, in the above embodiment, the groove portion 224 extending in the vertical direction is formed on the opposing surfaces of the pair of side wall portions 222 e of the document feeding device 221. At the lower end portion of the groove portion 224, there is formed a positioning portion 224c which positions the upstream guide member 271 by engaging with a protrusion 271m formed on the upstream guide member 271.
　これによれば、上流側ガイド部材２７１を上記一対の側壁部２２２ｅの間に高い位置精度でセットすることができ、上流側ガイド部材２７１の原稿搬送面２７１ｄの位置がばらつくのを防止することができる。したがって、原稿搬送路２２５の隙間が広過ぎる等して搬送中の原稿が該搬送路２２５内において厚さ方向に変位するのを防止することができる。よって、搬送中の原稿とコンタクトイメージセンサー２１１ーとの距離がばらつくのをより一層確実に抑制することができる。 According to this, the upstream guide member 271 can be set with high positional accuracy between the pair of side wall portions 222e, and the variation in the position of the document conveyance surface 271d of the upstream guide member 271 can be prevented. it can. Accordingly, it is possible to prevent the document being conveyed from being displaced in the thickness direction in the conveyance path 225 due to the gap of the document conveyance path 225 being too wide or the like. Therefore, the variation in the distance between the document being conveyed and the contact image sensor 211 can be further reliably suppressed.
　また、上記溝部２２４における上記位置決め部２２４ｃの上側に隣接する部分には、下側ほど溝幅が狭くなる案内部２２４ｂが形成されている。 Further, in a portion of the groove portion 224 adjacent to the upper side of the positioning portion 224c, a guide portion 224b whose groove width becomes narrower toward the lower side is formed.
　これによれば、上流側ガイド部材２７１のセット作業に際して、上記突部２７１ｍを案内部２２４ｂによって位置決め部２２４ｃへとスムーズに案内することができる。よって、上流側ガイド部材２７１のセット作業を容易に行うことができる。 According to this, when the upstream guide member 271 is set, the projection 271m can be smoothly guided to the positioning portion 224c by the guide portion 224b. Therefore, the setting operation of the upstream guide member 271 can be easily performed.
　さらに、上流側ガイド部材２７１の突部２７１ｍは、溝部２２４の下端部の位置決め部２２４ｃに係合した状態において、位置決め部２２４ｃの側壁に点接触するように形成されている。 Furthermore, the protrusion 271m of the upstream guide member 271 is formed to point-contact with the side wall of the positioning portion 224c in a state engaged with the positioning portion 224c at the lower end portion of the groove portion 224.
　この構成によれば、上流側ガイド部材２７１のセット作業時に該上流側ガイド部材２７１が傾いたとしても、突部２７１ｍと溝部２２４の側壁との接触によるこじりが生じ難い。したがって、上流側ガイド部材２７１のセット作業をより一層容易化することができる。 According to this configuration, even if the upstream side guide member 271 is inclined at the time of setting operation of the upstream side guide member 271, the contact due to the contact between the protrusion 271m and the side wall of the groove portion 224 does not easily occur. Therefore, the setting operation of the upstream guide member 271 can be further facilitated.
　上記実施形態における画像形成装置１は、上記原稿給紙装置２２１を備えている。したがって、コンタクトイメージセンサー２１１による原稿画像の読取り精度が向上するので、画像形成部２０によって原稿画像を用紙Ｐに精度良く再現印刷することができる。 The image forming apparatus 1 in the above-described embodiment is provided with the above-mentioned document feeding device 221. Therefore, the reading accuracy of the document image by the contact image sensor 211 is improved, so that the document image can be reproduced and printed on the sheet P by the image forming unit 20 with high accuracy.
　《他の実施形態》
　上記実施形態では、コンタクトイメージセンサー２１１を原稿搬送路２２５の内側に設けるようにしているが、これに限ったものではなく、例えば原稿搬送路２２５の内側及び外側の双方に設けるようにしてもよい。 Other Embodiments
In the above embodiment, the contact image sensor 211 is provided inside the document conveyance path 225. However, the invention is not limited to this. For example, the contact image sensor 211 may be provided both inside and outside the document conveyance path 225 .
　上記実施形態では、コンタクトガラス２７４を着脱式の固定部材２７５によって上記当接面２７１ｂに固定するようにしているが、これに限ったものではなく、コンタクトガラス２７４を接着剤等により当接面２７１ｂに固定するようにしてもよい。 In the above embodiment, the contact glass 274 is fixed to the contact surface 271b by the detachable fixing member 275. However, the present invention is not limited thereto. It may be fixed to
　上記実施形態では、上記当接面２７１ｂは、原稿搬送面２７１ｄと上記コンタクトガラス２７４の上面とが面一になるように、コンタクトガラス２７４の位置決めを行うように構成されているが、これに限ったものではない。すなわち、当接面２７１ｂは、原稿搬送面２７１ｄがコンタクトガラス２７４ｄの上面よりも所定高さだけ高くなるように又は低くなるようにコンタクトガラス２７４の位置決めを行うように構成されていてもよい。 In the above embodiment, the contact surface 271b is configured to position the contact glass 274 so that the document conveyance surface 271d and the upper surface of the contact glass 274 are flush with each other. It is not That is, the contact surface 271b may be configured to position the contact glass 274 such that the document conveyance surface 271d is higher or lower than the upper surface of the contact glass 274d by a predetermined height.
　上記実施形態では、画像形成装置１がプリンターである例について説明したが、これに限ったものではなく、画像形成装置１は、例えばファクシミリ、複写機、及び複合機等であってもよい。 In the above embodiment, an example in which the image forming apparatus 1 is a printer has been described. However, the present invention is not limited to this, and the image forming apparatus 1 may be, for example, a facsimile, a copier, or a multifunction peripheral.
　以上説明したように、本発明は、画像読取装置及び該画像読取装置を備えた画像形成装置に有用である。 As described above, the present invention is useful for an image reading apparatus and an image forming apparatus provided with the image reading apparatus.

Claims (9)

  1. 　給紙トレイに載置された原稿を所定の原稿搬送路に沿って搬送して排紙トレイに排出する原稿送り機構と、上記所定の原稿搬送路に沿って配置されて該原稿搬送路を形成するガイド部材と、上記所定の原稿搬送路の側方に配置され、該所定の原稿搬送路を通過する原稿の画像を読取るコンタクトイメージセンサーと、該コンタクトイメージセンサーにおける原稿搬送路側を覆う透明ガラス板と、を備えた画像読取装置であって、
    　上記ガイド部材は、上記コンタクトイメージセンサーを内部に収容すると共に上記透明ガラス板によって覆われた凹部と、該凹部の開放側の周縁部に形成され、上記透明ガラス板の周縁部に当接することにより、該透明ガラス板における原稿搬送路側の面が上記ガイド部材の原稿搬送面に対して所定高さになるように当該透明ガラス板の位置決めを行う位置決め面と、を有する画像読取装置。     A document feeding mechanism for conveying a document placed on a paper feed tray along a predetermined document conveyance path and discharging the document onto a discharge tray, and a document conveyance mechanism disposed along the predetermined document conveyance path Guide member, a contact image sensor disposed on the side of the predetermined document conveyance path and reading an image of a document passing through the predetermined document conveyance path, and a transparent glass plate covering the document conveyance path side of the contact image sensor And an image reading apparatus comprising
    The guide member is formed in the concave portion which accommodates the contact image sensor inside and is covered by the transparent glass plate, and the peripheral portion on the open side of the concave portion, and abuts on the peripheral portion of the transparent glass plate And a positioning surface for positioning the transparent glass plate such that the surface of the transparent glass plate on the side of the document conveyance path is at a predetermined height with respect to the document conveyance surface of the guide member.
  2. 　請求項１記載の画像読取装置において、
    　上記所定高さは、上記透明ガラス板における原稿搬送側の面が上記ガイド部材の原稿搬送面に対して面一になるような高さである、画像読取装置。     In the image reading apparatus according to claim 1,
    The image reading apparatus, wherein the predetermined height is such that the surface on the document conveyance side of the transparent glass plate is flush with the document conveyance surface of the guide member.
  3. 　請求項１記載の画像読取装置において、
    　上記コンタクトイメージセンサーが上記透明ガラス板に密着するように該コンタクトイメージセンサーを付勢する付勢部材をさらに備えている、画像読取装置。     In the image reading apparatus according to claim 1,
    The image reading apparatus further comprising a biasing member for biasing the contact image sensor such that the contact image sensor is in close contact with the transparent glass plate.
  4. 　請求項１記載の画像読取装置において、
    　上記透明ガラス板を上記ガイド部材に形成された上記位置決め面に対して押付けて固定する着脱式の固定部材をさらに備えている、画像読取装置。     In the image reading apparatus according to claim 1,
    An image reading apparatus further comprising a detachable fixing member for pressing and fixing the transparent glass plate to the positioning surface formed on the guide member.
  5. 　請求項１に記載の画像読取装置において、
    　上記原稿の幅方向において、上記原稿搬送路を挟んで互いに対向して配置された一対の側壁部を備え、
    　上記側壁部における互いの対向面にはそれぞれ、上記ガイド部材における原稿幅方向の両端部にそれぞれ形成された係合部に係合することで当該ガイド部材の位置決めを行う位置決め部が形成されている、画像読取装置。     In the image reading apparatus according to claim 1,
    The apparatus has a pair of side wall portions disposed to face each other across the document conveyance path in the width direction of the document,
    Positioning portions for positioning the guide member are formed by engaging engaging portions respectively formed on both ends of the guide member in the document width direction on mutually facing surfaces of the side wall portions. , Image reader.
  6. 　請求項５記載の画像読取装置において、
    　上記ガイド部材は、上記一対の側壁部の間に上側からセットされるものであり、
    　上記係合部は、上記ガイド部材における原稿幅方向の両端部からそれぞれ突出する一対の突部であり、
    　上記一対の側壁部における互いの対向面には、上下方向に延びると共に上記突部を上側から受け入れる溝部が形成され、
    　上記溝部の下端部は、上記突部に係合することにより上記ガイド部材の位置決めを行う上記位置決め部として機能する、画像読取装置。　     In the image reading apparatus according to claim 5,
    The guide member is set from the upper side between the pair of side wall portions,
    The engaging portions are a pair of protrusions which respectively project from both end portions in the document width direction of the guide member,
    Grooves extending in the vertical direction and receiving the protrusions from the upper side are formed on mutually opposing surfaces of the pair of side wall portions,
    The lower end portion of the groove functions as the positioning portion which positions the guide member by engaging with the protrusion.
  7. 　請求項６記載の画像読取装置において、
    　上記溝部における上記位置決め部の上側に隣接する部分には、下側ほど溝幅が狭くなる案内部が形成されている、画像読取装置。     In the image reading apparatus according to claim 6,
    The image reader according to claim 1, wherein a guide portion is formed in a portion of the groove adjacent to the upper side of the positioning portion, the groove being narrower toward the lower side.
  8. 　請求項７記載の画像読取装置において、
    　上記突部は、上記溝部の下端部の位置決め部に係合した状態において、当該溝部の側壁に点接触するように形成されている、画像読取装置。     In the image reading apparatus according to claim 7,
    The image reading apparatus, wherein the projection is in point contact with the side wall of the groove in a state of being engaged with the positioning portion at the lower end of the groove.
  9. 　請求項１記載の画像読取装置を備えた画像形成装置。 An image forming apparatus comprising the image reading apparatus according to claim 1.
PCT/JP2015/075255 2014-10-31 2015-09-04 Image reading apparatus and image forming apparatus comprising image reading apparatus WO2016067750A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63184453A (en) * 1987-01-26 1988-07-29 Minolta Camera Co Ltd Picture reader
JP2008010978A (en) * 2006-06-27 2008-01-17 Brother Ind Ltd Image reader, and image forming apparatus provided with same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63184453A (en) * 1987-01-26 1988-07-29 Minolta Camera Co Ltd Picture reader
JP2008010978A (en) * 2006-06-27 2008-01-17 Brother Ind Ltd Image reader, and image forming apparatus provided with same

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JPWO2016067750A1 (en) 2017-10-12

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