JP5278793B2 - Image reading apparatus and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reader capable of achieving improvement of positioning accuracy, at least, in a height direction of a guide member relative to a supporting member, and an image forming apparatus equipped with the image reader. <P>SOLUTION: The image reader 150 includes: a light source 190; a deflection means for deflecting reflected light from a non-reading surface of an image reading object; a light receiving means 221 for receiving the deflected light; an image information generating means 220 for generating image information from the received light; a traveling body 163 configured such that at least the deflection means is installed, moving along a surface to be read; a guide member 501 having a guide surface 505 guiding the traveling body in a moving direction; and a supporting member 502 supporting the guide member. The reader has a protrusive part 503 provided by extending a part of a sidewall which forms the guide surface in a direction orthogonal to the moving direction in parallel with the guide surface and protruding it to the guide member, and a positioning hole 504 joined with the protrusive part to position the guide member relative to the supporting member, and provided in the supporting member. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an image reading apparatus such as a scanner for reading an optical image obtained by irradiating light on a document on which an image is recorded, and an image forming apparatus such as a copying machine or a facsimile provided with the image reading apparatus.

Conventionally, image reading is performed by irradiating a document with an image capturing unit such as a CCD (Charge Coupled Devices) or CMOS (Complementary Metal Oxide Semiconductor) based on light reflected from the document and reading the image of the document. The device is known.
FIG. 19 shows an example of a conventional image reading apparatus. As shown in FIG. 19, the image reading apparatus 101 includes a cylindrical xenon lamp 104 as a light source. The image reading apparatus 101 irradiates a document placed on the contact glass 102 with irradiation light of the xenon lamp. The diffuse reflected light from the light is guided to the image sensor 110 through the lens 109 and converted into an electric signal by the image sensor. Such an image reading apparatus includes a first traveling body 103 including a first mirror 105 that deflects reflected light from the original, and a second mirror 107 and a third mirror 108 that further deflect light from the first mirror 105. The 2nd traveling body 106 containing is provided. Then, the first traveling body 103 travels along the document surface on the traveling surface of the rail 201 shown in FIG. 20 provided in the image reading apparatus 101, and the second traveling body 106 travels on the traveling surface of the rail 202 on the document surface. Scan along the document.

  In addition, there are U-shaped and L-shaped as the shape of the rail, and a traveling surface on which the traveling body travels is formed on one side wall adjacent to the U-shaped or L-shaped bent portion. The other side wall is attached to a frame provided in the apparatus main body by screws or the like (Patent Document 1 and Patent Document 2).

JP 2005-215420 A Japanese Patent Laid-Open No. 6-233067 Japanese Patent No. 3877266

Generally, a rail such as an L-shape or a U-shape is fitted into a plurality of positioning holes provided in the frame by embedding a plurality of embossments provided on an opposite surface facing the frame on the other side wall. The rail is attached to the frame with screws or the like with the rail positioned.
However, since there are tolerances in the positions of the positioning holes provided in the frame, the embossing positions provided in the rails, etc., when the embosses are fitted into the positioning holes, the tolerances increase. If the tolerance is increased, the position of the traveling surface in the height direction is greatly deviated from an appropriate position with respect to the frame to which the rail is attached. Therefore, the traveling position in the apparatus main body of the traveling body traveling on the traveling surface of the rail is shifted from an appropriate position in the apparatus main body height direction. Therefore, the light incident position on the image sensor that receives the light deflected by the mirror provided on the traveling body traveling on the traveling surface of the rail through the lens is deviated from an appropriate position and read. There arises a problem that geometric characteristics such as image skew and magnification error deviation deteriorate.

  Further, in the image reading device described in Patent Document 3, the frame bottom surface and the rail bottom end are welded and positioned. However, if the frame bottom surface is bent by its own weight, the rail is also bent by the bending, and the rail against the frame side surface. The position of the traveling surface in the height direction will deviate from the proper position. In particular, in an A3-compatible image reading apparatus, at least the longitudinal dimension of the bottom surface of the frame is 420 mm or more, so that the positional deviation in the height direction of the running surface of the rail with respect to the side surface of the frame due to bending of the bottom surface of the frame becomes significant. Therefore, the above problem occurs similarly.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an image reading apparatus capable of improving at least the positioning accuracy of the guide member in the height direction with respect to the support member, and the image reading apparatus. An image forming apparatus is provided.

In order to achieve the above object, the invention of claim 1 is directed to a light source for irradiating light on an image reading object, a deflecting means for deflecting reflected light reflected by the image reading object, and deflected by the deflecting means. A light receiving means for receiving the received light, an image information generating means for generating image information based on the light received by the light receiving means, and a deflecting means provided at least and moving along the surface to be read of the image reading object Possible traveling body, a guide member having a guide surface for guiding the traveling body in the moving direction when the traveling body moves along the surface to be read, and a support provided on the apparatus main body for supporting the guide member In the image reading apparatus provided with a member, a protruding portion provided by extending a part of the side wall on which the guide surface is formed in a direction perpendicular to the moving direction in parallel to the guide surface and protruding from the guide member; The guide fitting with the protrusion Positioning the timber relative to the support member, have a positioning hole provided in the support member, is characterized in that a projecting portion of the upper surface and the guide surface formed on the same plane .
According to a second aspect of the present invention, in the image reading apparatus according to the first aspect, the positioning hole communicates in the movement direction, and a dimension in a direction orthogonal to the movement direction is the same as the direction orthogonal to the protrusion. It is characterized by comprising a certain first hole portion and a second hole portion whose dimension in the orthogonal direction is larger than that of the projecting portion in the orthogonal direction.
According to a third aspect of the present invention, in the image reading apparatus of the second aspect, the second hole is provided on the opposite side of the positioning hole in the moving direction with respect to the initial position on the guide surface of the traveling body. It is characterized by this.
According to a fourth aspect of the present invention, in the image reading apparatus according to the first, second, or third aspect, the side walls of the guide member and the support member facing each other are elongated in a direction perpendicular to the moving direction. A long hole is provided.
According to a fifth aspect of the present invention, in the image reading apparatus according to the first, second, or third aspect, the guide with respect to the support member is brought about by contacting the protruding portion with an inner wall of the positioning hole in the moving direction. The member is positioned in the moving direction.
According to a sixth aspect of the present invention, in the image reading apparatus of the first, second, third, fourth or fifth aspect, the hook shape provided on the guide member and the hook shape provided on the support member are hooked. It has a hook part.
According to a seventh aspect of the present invention, there is provided an image forming apparatus comprising: an image reading unit that reads information relating to an image from an image reading target; and an image forming unit that forms an image based on the information read by the image reading unit. The image reading device of claim 1, 2, 3, 4, 5 or 6 is provided as the image reading means.

  In the conventional image reading apparatus, the embossment that is a positioning reference provided on the side wall adjacent to the side wall where the guide surface of the guide member is formed is not provided on the same plane as the guide surface. Further, the distance in the height direction from the emboss to the guide surface varies depending on the tolerance of the position where the emboss is provided with respect to the adjacent side wall. Thus, when the distance in the height direction between the emboss and the guide surface changes due to the above-described tolerance, when the guide member is attached to the support member with the emboss fitted in the positioning hole provided in the support member, the positioning hole and the guide The positional relationship with the surface in the height direction changes by the tolerance.

  In the present invention, the protruding portion provided by extending a part of the side wall on which the guide surface is formed in a direction perpendicular to the moving direction in parallel with the guide surface and protruding from the guide member is the height of the guide member relative to the support member. It becomes the standard of direction. That is, the positioning in the height direction is performed on the same plane as the guide surface of the protrusion fitted in the positioning hole provided in the support member. Accordingly, since the positioning in the height direction is substantially the same as that performed on the guide surface, the positional relationship in the height direction between the positioning hole and the guide surface when the protruding portion is fitted into the positioning hole. However, it does not change as in the conventional image reading apparatus. Therefore, there is no tolerance for the positional relationship between the positioning hole and the guide surface in the height direction, and the stacking tolerance when the guide member is attached to the support member is reduced. The positioning accuracy in the height direction can be improved.

  As mentioned above, according to this invention, there exists the outstanding effect that the positioning accuracy of the height direction of the guide member with respect to a support member can be improved.

Hereinafter, an embodiment in which the present invention is applied to a copying machine (hereinafter simply referred to as a copying machine) which is an electrophotographic image forming apparatus will be described.
First, a basic configuration of the copying machine according to the present embodiment will be described. FIG. 2 is a schematic configuration diagram showing the copying machine. The copying machine includes an image forming unit 1, a blank paper supply device 40, and a document conveyance reading unit 50. The document conveyance reading unit 50 includes a scanner 150 that is an image reading device fixed on the image forming unit 1 and an ADF 51 that is a document conveyance device supported by the scanner 150.

  The blank paper supply device 40 separates and feeds the two paper feed cassettes 42 arranged in multiple stages in the paper bank 41, the feed roller 43 for feeding the recording paper as the recording material from the paper feed cassette 42, and the fed recording paper. A separation roller 45 and the like that are supplied to the paper path 44 are provided. In addition, it has a plurality of transport rollers 46 for transporting the recording paper to the paper feed path 37 of the copying machine. Then, the recording paper in the paper feeding cassette 42 is fed into a paper feeding path 37 in the copying machine.

  The copying machine includes an optical writing device 2, four process units 3K, 3Y, 3M, and 3C that form toner images of K, Y, M, and C, a transfer unit 24, a paper transport unit 28, and a registration roller pair 33. A fixing device 34, a switchback device 36, a paper feed path 37, and the like. Then, a light source such as a laser diode or LED (not shown) disposed in the optical writing device 2 is driven, and the laser is directed toward the photosensitive members 4K, 4Y, 4M, 4C of the process units 3K, 3Y, 3M, 3C. Irradiate light L. By this irradiation, electrostatic latent images are formed on the surfaces of the drum-shaped photoconductors 4K, 4Y, 4M, and 4C, and the latent images are developed into toner images through a predetermined development process. Note that the subscripts K, Y, M, and C added after the reference numerals indicate specifications for black, yellow, magenta, and cyan.

  FIG. 3 is an enlarged partial configuration diagram illustrating a part of the internal configuration of the copying machine. In the figure, process units 3K, 3Y, 3M, and 3C each support a photosensitive member and various devices disposed around it as a unit on a common support, On the other hand, it is removable. Taking the process unit 3K for black as an example, this has a developing device 6K for developing the electrostatic latent image formed on the surface of the photosensitive member 4K into a black toner image in addition to the photoreceptor 4K. Further, it also includes a drum cleaning device 15K that cleans transfer residual toner adhering to the surface of the photoreceptor 4K after passing through a K primary transfer nip described later. This copying machine has a so-called tandem configuration in which four process units 3K, 3Y, 3M, and 3C are arranged so as to face an intermediate transfer belt 25, which will be described later, along the endless movement direction. .

  FIG. 4 is a partially enlarged view showing a part of a tandem part composed of four process units 3K, 3Y, 3M, 3C. Since the four process units 3K, 3Y, 3M, and 3C have the same configuration except that the colors of the toners to be used are different, the subscripts K, Y, M, and C attached to the respective reference numerals in FIG. Omitted. As shown in the figure, the process unit 3 includes a charging device 5, a developing device 6, a drum cleaning device 15, a charge removal lamp 22, and the like around the photoconductor 4.

  As the photoreceptor 4, a drum-shaped member is used in which a photosensitive layer is formed by applying a photosensitive organic photosensitive material to a base tube made of aluminum or the like. However, an endless belt may be used.

  The developing device 6 develops the latent image using a two-component developer containing a magnetic carrier and a nonmagnetic toner (not shown). Then, the agitation unit 7 that conveys the two-component developer contained therein and supplies the developer sleeve 12 with stirring, and the toner in the two-component developer carried on the development sleeve 12 is transferred to the photoreceptor 4. And a developing unit 11 for the purpose.

  The stirring unit 7 is provided at a position lower than the developing unit 11, and is provided on the bottom surface of the developing case 9, two conveying screws 8 arranged in parallel to each other, a partition plate provided between these screws. The toner density sensor 10 is included.

  The developing unit 11 includes a developing sleeve 12 that faces the photosensitive member 4 through the opening of the developing case 9, a magnet roller 13 that is non-rotatably provided inside the developing sleeve 12, a doctor blade 14 that approaches the developing sleeve 12, and the like. ing. The developing sleeve 12 has a non-magnetic rotatable cylindrical shape. The magnet roller 13 has a plurality of magnetic poles arranged along the rotation direction of the sleeve. Each of these magnetic poles applies a magnetic force to the two-component developer on the sleeve at a predetermined position in the rotation direction. As a result, the two-component developer sent from the stirring unit 7 is attracted and carried on the surface of the developing sleeve 12 and a magnetic brush is formed along the magnetic field lines on the sleeve surface.

  This magnetic brush is regulated to an appropriate layer thickness when passing through the position facing the doctor blade 14 as the developing sleeve 12 rotates, and then conveyed to the developing area facing the photoreceptor 4. Then, the toner is transferred onto the electrostatic latent image by the potential difference between the developing bias applied to the developing sleeve 12 and the electrostatic latent image on the photosensitive member 4, thereby contributing to development. Further, as the developing sleeve 12 rotates, the developing sleeve 12 is returned to the developing portion 11 again, and after being separated from the sleeve surface by the influence of the repulsive magnetic field formed between the magnetic poles of the magnet roller 13, the developing sleeve 12 is returned to the stirring portion 7. An appropriate amount of toner is supplied to the two-component developer in the stirring unit 7 based on the detection result of the toner density sensor 10. The developing device 6 may employ a one-component developer that does not include a magnetic carrier, instead of one that uses a two-component developer.

  As the drum cleaning device 15, a system in which a polyurethane rubber cleaning blade 16 is pressed against the photosensitive member 4 is used, but another system may be used. For the purpose of enhancing the cleaning property, this example employs a system having a contact conductive fur brush 17 whose outer peripheral surface is in contact with the photoreceptor 4 so as to be rotatable in the direction of the arrow in the figure. The fur brush 17 also serves to apply the lubricant to the surface of the photosensitive member 4 while scraping the lubricant from a solid lubricant (not shown) into a fine powder. A metal electric field roller 18 for applying a bias to the fur brush 17 is rotatably provided in the direction of the arrow in the figure, and the tip of the scraper 19 is pressed against it. The toner attached to the fur brush 17 is transferred to the electric field roller 18 to which a bias is applied while rotating in contact with the fur brush 17 in the counter direction. Then, after being scraped from the electric field roller 18 by the scraper 19, it falls onto the recovery screw 20. The collection screw 20 conveys the collected toner toward the end of the drum cleaning device 15 in the direction perpendicular to the drawing surface, and delivers it to an external recycling conveyance device. The recycle transport device sends the delivered toner to the developing device 15 for recycling.

  The neutralization lamp 22 neutralizes the photoreceptor 4 by light irradiation. The surface of the photoreceptor 4 that has been neutralized is uniformly charged by the charging device 5 and then subjected to optical writing processing by the optical writing device 2. As the charging device 5, a charging device to which a charging roller to which a charging bias is applied is rotated while being in contact with the photosensitive member 4 is used. A scorotron charger or the like that performs a non-contact charging process on the photoreceptor 4 may be used.

  In FIG. 3 described above, 4K, 4Y, 4M, and 4C toner images are formed on the photoreceptors 4K, 4Y, 4M, and 4C of the four process units 3K, 3Y, 3M, and 3C by the processes described above. Is done.

  A transfer unit 24 is disposed below the four process units 3K, 3Y, 3M, and 3C. The transfer unit 24 moves the intermediate transfer belt 25 stretched by a plurality of rollers endlessly in the clockwise direction in the drawing while contacting the photoreceptors 4K, 4Y, 4M, and 4C. As a result, primary transfer nips for K, Y, M, and C in which the photoreceptors 4K, 4Y, 4M, and 4C contact the intermediate transfer belt 25 are formed. In the vicinity of the primary transfer nips for K, Y, M, and C, the intermediate transfer belt 25 is moved by the primary transfer rollers 26K, 26Y, 26M, and 26C disposed inside the belt loop to the photoreceptors 4K, 4Y, 4M, and so on. It is pressing toward 4C. A primary transfer bias is applied to the primary transfer rollers 26K, 26Y, 26M, and 26C by a power source (not shown). As a result, a primary transfer electric field for electrostatically moving the toner images on the photoconductors 4K, 4Y, 4M, and 4C toward the intermediate transfer belt 25 is formed in the primary transfer nips for K, Y, M, and C. Has been. In the drawing, a toner image is formed on each of the primary transfer nips on the front surface of the intermediate transfer belt 25 that sequentially passes through the primary transfer nips for K, Y, M, and C with endless movement in the clockwise direction. Are sequentially superimposed and primarily transferred. By this primary transfer of superposition, a four-color superposed toner image (hereinafter referred to as a four-color toner image) is formed on the front surface of the intermediate transfer belt 25.

  Below the transfer unit 24 in the figure, a paper transport unit 28 is provided between the drive roller 30 and the secondary transfer roller 31 to endlessly move the endless paper transport belt 29. The intermediate transfer belt 25 and the paper transport belt 29 are sandwiched between the secondary transfer roller 31 and the lower stretching roller 27 of the transfer unit 24. As a result, a secondary transfer nip is formed in which the front surface of the intermediate transfer belt 25 and the front surface of the paper transport belt 29 come into contact with each other. A secondary transfer bias is applied to the secondary transfer roller 31 by a power source (not shown). On the other hand, the lower stretching roller 27 of the transfer unit 24 is grounded. Thereby, a secondary transfer electric field is formed in the secondary transfer nip.

  A registration roller pair 33 is disposed on the right side of the secondary transfer nip in the drawing, and the secondary transfer nip 33 is arranged at a timing at which the recording paper sandwiched between the rollers can be synchronized with the four-color toner image on the intermediate transfer belt 25. Send to transfer nip. In the secondary transfer nip, the four-color toner images on the intermediate transfer belt 25 are secondarily transferred onto the recording paper under the influence of the secondary transfer electric field and nip pressure, and become a full-color image combined with the white color of the recording paper. The recording paper that has passed through the secondary transfer nip is separated from the intermediate transfer belt 25 and is conveyed to the fixing device 34 along with its endless movement while being held on the front surface of the paper conveying belt 29.

  On the surface of the intermediate transfer belt 25 that has passed through the secondary transfer nip, residual transfer toner that has not been transferred to the recording paper at the secondary transfer nip adheres. This transfer residual toner is scraped off and removed by a belt cleaning device in contact with the intermediate transfer belt 25.

  The recording paper conveyed to the fixing device 34 is fixed to a full-color image by pressurization or heating in the fixing device 34 and then sent from the fixing device 34 to the paper discharge roller pair 35 shown in FIG. It is discharged outside the machine.

  In FIG. 2 described above, a switchback device 36 is disposed under the paper transport unit 22 and the fixing device 34. As a result, the recording paper that has undergone the image fixing process on one side is switched by the switching claw to the recording paper reversing device side, and is reversed there to enter the secondary transfer transfer nip again. Then, after the secondary transfer process and the fixing process of the image are performed on the other side, the sheet is discharged onto a discharge tray.

  A reading unit that reads an image of an original of the scanner 150 fixed on the copying machine includes a first carriage 162 and a second carriage 163. The first carriage 162 and the second carriage 163 are arranged directly below a contact glass (not shown) fixed to the upper wall of the casing of the scanner 150 so as to contact the document MS. The first carriage 162 is provided with a light source, a reflection mirror, and the like, and the second carriage 163 is provided with a reflection mirror and the like. When reading the image of the document MS conveyed by the ADF 51, the first carriage 162 and the second carriage 163 move to the position A in FIG. 2, and the document MS conveyed by the ADF 51 is stationary there. While passing through the contact glass, the light emitted from the light source is sequentially reflected by the original surface, and the image of the original MS is read by the CCD as the imaging means via a plurality of reflecting mirrors. Hereinafter, control for reading the image of the document MS by the reading unit while conveying the document by the ADF 51 is referred to as through-reading control.

  On the other hand, when reading the image of the document MS placed on the contact glass, the first carriage 162 and the second carriage 163 are moved from the left side to the right side in the drawing. Then, in the process of moving the first carriage 162 and the second carriage 163 from the left side to the right side in the figure, the light emitted from the light source is reflected by the document placed on the contact glass, and a plurality of reflecting mirrors and a connection are formed. An image of the document MS is read by a CCD as an imaging means via an image lens or the like.

  An ADF 51 disposed on the scanner 150 includes a document placing table 53 for placing a document MS before reading on a main body cover 52, a transport unit 54 for transporting the document MS, and a document MS after reading. A document stack base 55 for stacking is held. As shown in FIG. 5, it is supported by a hinge 159 fixed to the scanner 150 so as to be swingable in the vertical direction. Then, by swinging, it moves like an open / close door, and the contact glass 155 on the upper surface of the scanner 150 is exposed in the opened state. In the case of a single-bound document such as a book in which one corner of a document bundle is bound, the documents cannot be separated one by one, and therefore cannot be transported by the ADF 51. Therefore, in the case of a single-sided original, the ADF 51 is opened as shown in FIG. Then, the image of the page is read by the reading unit of the scanner 150 shown in FIG.

  On the other hand, in the case of a document bundle in which a plurality of independent documents MS are simply stacked, the documents MS can be sequentially read by the reading unit of the scanner 150 while being automatically conveyed one by one by the ADF 51. In this case, after setting the original bundle on the original placing table 53, the copy start button of the operation unit 140 is pressed. Then, the ADF 51 sends the originals MS of the original bundle placed on the original placement table 53 into the conveyance unit 54 in order from the top, and conveys the original MS toward the original stack table 55 while inverting it. In the course of this conveyance, immediately after the document MS is reversed, the original MS is passed directly over the first carriage 162 and the second carriage 162 of the scanner 150. At this time, the image of the document MS is read by the reading unit of the scanner 150.

Next, the reading unit of the scanner 150 will be described with reference to FIGS.
FIG. 6 is a perspective view showing the reading unit of the scanner 150 from obliquely above. For convenience, the illustration of the contact glass 155 shown in FIG. 7 is omitted. FIG. 7 is an enlarged configuration diagram showing the moving reading unit of the scanner 150 from the side. As shown in the figure, a first carriage 162 and a second carriage 163 are provided in the housing 160 of the scanner 150. The first carriage 162 includes a light source unit 190 in which light emitting diodes (hereinafter referred to as LEDs) as a plurality of light emitting elements are arranged in an array, and a first mirror 162a. The second carriage 163 includes a second mirror 163a and a third mirror 163b.

In the housing 160 of the scanner 150, although not shown, two metal first rails extending in the longitudinal direction are fixed at a predetermined interval in the short direction. A first carriage 162 is bridged between one rail and can travel along the longitudinal direction on the first rail. Below the first rail, two metal second rails (not shown) extending in the longitudinal direction of the casing are fixed at a predetermined interval in the lateral direction of the casing. A second carriage 163 is bridged between two second rails (not shown) so that the second carriage 163 can travel along the longitudinal direction on the second rail.
Also, a metal beam plate 164 is fixed to the housing 160, and a scanner board which is an electronic circuit board having an imaging lens 200 and a CCD 221 fixed to the upper surface of the metal beam plate 164 by screws. A lens unit 210 including a unit 220 (hereinafter referred to as SBU 220) is supported.

  As shown in FIG. 6, a drive motor 170 is provided at the upper right in the drawing, and a drive timing pulley 172 is fixed to the rotation shaft of the driven gear 171 that meshes with the drive gear of the drive motor 170. In addition, a rotation shaft 173 is rotatably supported at one end portion in the longitudinal direction in the casing on the right side in the drawing. A driven timing pulley 174 is fixed to one end portion of the rotating shaft 173, and a driving timing belt 175 is stretched between the driving timing pulley 172 and the driven timing pulley 174. Further, the first pulley 180 is fixed in the vicinity of both end portions of the rotating shaft 173. In addition, two second pulleys 181 are rotatably supported at a predetermined interval in the short side direction of the other end in the longitudinal direction in the housing on the left side in the drawing, and the first pulley 180 and the second pulley 181 are supported. The first timing belt 182 is stretched between the two.

  The second carriage 163 includes a pair of mirror stay portions 163c that support both ends of the second mirror 163a and the third mirror 163b in the main scanning direction, and arm portions 163d that respectively extend from the mirror stay portion 163c toward the first carriage. doing. Further, a third pulley 183 is rotatably supported on the side surface of the housing of the mirror stay portion 163c. A bracket 163e is provided at the tip of the arm portion 163d, and a fourth pulley 184 is rotatably supported by the bracket 163e. A second timing belt 185 is stretched around the third pulley 183 and the fourth pulley 184, and a part of the second timing belt 185 is fixed to the bottom of the housing 160 by a fixing member (not shown). .

  Further, the first timing belt 182 and the second timing belt 185 are fixed to the bottom of the first carriage 162, respectively.

  When the image reading is started, the light source unit 190 irradiates light to a document MS (not shown). Further, the drive motor 170 is driven, and the rotational driving force of the drive motor 170 is transmitted to the rotary shaft 173 via the drive timing belt 175, so that the rotary shaft 173 rotates. As the rotating shaft 173 rotates, the first timing belt 182 rotates clockwise in the drawing. As a result, the first carriage 162 fixed to the first timing belt 182 moves from the left side to the right side in the drawing. Further, when the first carriage 162 moves, the second timing belt 185 fixed to the first carriage 162 moves to the right side in the drawing. Since a part of the second timing belt 185 is fixed to the bottom of the housing 160, the second timing belt 185 does not rotate on the spot but moves the second carriage 163 to the right in the drawing. It rotates with it. Here, since the diameters of the third and fourth pulleys 183 and 184 are twice the diameters of the first and second pulleys, the second carriage 163 is half the speed of the first carriage 162. Move to the right in the figure. Thus, the second carriage 163 moves in the same direction as the first carriage at half the speed of the first carriage 162 so that the optical path length of the light flux from the document surface to the imaging lens 200 does not change. ing.

  A control unit that controls the drive motor 170 controls the drive motor 170 in accordance with an image reading request signal for each line sent from the host computer, and controls the moving speed between the second carriage 163 and the first carriage 162. I have control.

  A document (not shown) on which light emitted from the light source unit 190 is placed on the contact glass 155 in the process of moving the first and second carriages 162 and 163 from the left side to the right side in the drawing at a speed ratio of 2: 1. Reflect with MS. The optical image obtained by this reflection is guided to the imaging lens 200 via the first mirror 162a, the second mirror 163a, and the third mirror 163c, and is imaged on the CCD 221 that is an imaging means.

  The CCD 221 photoelectrically converts the formed reflected light image of the document MS and outputs an analog image signal that is a read image. Then, when the first carriage 162 and the second carriage 163 move to the position shown by the dotted line in FIG. 7, the reading of the document MS is finished, and the first carriage 162 and the second carriage 163 are at the home position shown by the solid line in the drawing. Return to The analog image signal output from the CCD 221 is converted into a digital image signal by an analog / digital converter, and each image processing (binarization, multi-value conversion, gradation) is performed on a circuit board on which an image processing circuit is mounted. Processing, scaling processing, editing processing, etc.).

[Configuration example 1]
As shown in FIG. 8, two metal first rails 601 and 611 extending in the longitudinal direction (traveling direction of the traveling body) are disposed in the housing 160 of the scanner 150 in the short direction (first direction). They are fixed to the front and rear of the scanner at a predetermined interval in the longitudinal direction of the carriage. In addition, two metal second rails 501 and 511 extending in the longitudinal direction of the housing 160 are fixed to the front and rear of the scanner at a predetermined interval in the lateral direction of the housing. The first rail is formed integrally with the casing 160, and the second rails 501 and 511 are attached to the front frame 502 and the rear frame 512 that are the side walls of the casing 160 below the first rails 601 and 611.

  FIG. 9 is an enlarged view of the front frame side in the conventional scanner. Conventionally, by attaching the second rail 401 to the frame 402 so that the reference position in the height direction provided on the side surface of the second rail 401 matches the reference position provided on the frame 402, the second position on the frame 402 is adjusted. The two rails 401 have been positioned. In FIG. 9, the screw holes provided in the second rail 401 and the frame 402 are used as positioning references. Further, conventionally, there is a configuration in which the second frame 401 is positioned with respect to the frame 402 by providing an emboss on the side surface of the second rail 401 and fitting the emboss into a hole provided on the side surface of the frame 402.

  In the example shown in FIG. 9, positioning is performed at three locations, but the rail travel surface 403 that is provided on the second rail 401 and travels while contacting a second carriage (not shown) is provided on the side surface of the second rail 401. The distance a between the reference hole 404 in the height direction varies from the processing tolerance of the reference hole 404, and the positional relationship in the height direction between the reference hole 404 and the rail running surface 403 changes. Further, when the reference hole 404 is provided in the frame 402, there is a processing tolerance. Therefore, as these tolerances increase, the positioning accuracy in the height direction of the second rail 401 with respect to the frame 402 decreases.

  On the other hand, in this configuration example, as shown in FIG. 1, the projection shape 503 provided on the second rail 501 is inserted into the positioning hole 504 having the shape as shown in FIG. The second rail 501 is positioned with respect to the frame 502 in the height direction. Although FIG. 1 illustrates the front frame side, the second rail 511 is positioned with respect to the rear frame 512 on the rear frame side in the same manner as the front frame side. The basic concept of the configuration is the same as that of the previous frame 502 although there are differences due to the difference in orientation with respect to the frame 512 and the description of the rear frame 512 is omitted.

  Since the projection shape 503 provided on the second rail 501 is formed by extending the rail running surface 505 in the same plane, the wall surface 506 on the same plane as the rail running surface 505 of the projection shape 503 is the second rail. 501 is the reference in the height direction. Therefore, unlike the conventional scanner described above, there is no processing tolerance such that the distance a between the rail running surface 403 and the reference hole 404 which is the reference in the height direction of the second frame 401 varies. That is, the protrusion shape 503 is inserted into the positioning hole 504 provided in the front frame 502, and the positioning in the height direction is performed on the wall surface 506 on the same plane as the rail running surface 505 of the protrusion shape 503. Since it is the same as the positioning in the height direction on the traveling surface 505, the positional relationship in the height direction between the positioning hole 504 and the rail traveling surface 505 may change as in the conventional scanner. Absent. Therefore, there is no tolerance regarding the positional relationship in the height direction between the positioning hole 504 and the rail running surface 505, and the stacking tolerance when the second rail 501 is attached to the front frame 502 is reduced. The positioning accuracy in the height direction of the second rail 501 with respect to the front frame 502 can be improved.

  In addition, as shown in FIG. 1, by providing the protrusion shape 503 and the positioning hole 504 at two locations in the traveling body traveling direction in the second rail 501 and the front frame 502, the deviation in the traveling direction of positioning can be reduced. .

  Here, in this configuration example, the width w in the short direction of the positioning hole 504 shown in FIG. 10 is the same as the thickness of the second rail 501 in the thickness of the projection shape 503, and the thickness of the second rail 501. Is 1 (+ 0.03 / −0.07) mm, the width w in the short direction of the positioning hole 504 is required to be 1.04 mm or more, but 1 (+0. A tolerance of 09 / + 0.04) mm is desirable.

  As shown in FIG. 10, both ends of the positioning hole 504 have a long hole shape 507 orthogonal to the longitudinal direction of the positioning hole 504. This is because when the positioning hole 504 is to be formed in a rectangular shape in the front frame 502, both ends in the longitudinal direction of the positioning hole 504 are inevitably formed in an R shape. Thus, when both ends of the positioning hole 504 have an R shape, the width in the short direction at both ends of the positioning hole 504 becomes narrower than the center in the longitudinal direction of the positioning hole 504. That is, the width in the short direction at both ends of the positioning hole 504 becomes narrower than the above-described tolerance, so that the protrusion shape 503 cannot be inserted into the positioning hole 504 or is very difficult to insert. Therefore, as shown in FIG. 10, by providing the long hole shape 507 at both ends of the positioning hole 504, the protrusion shape 503 and the inner wall in the short hole direction are not in contact at both ends of the positioning hole 504. Widths in the short direction at both ends of 504 are narrowed, and problems such as the protrusion shape 503 being unable to be inserted into the positioning hole 504 can be suppressed.

  Further, when the second rail 501 is attached to the front frame 502, as shown in FIG. 1, it can be fastened by screwing or the like using a screw 508, but in the case of screwing, the screw 508 is attached to the front frame 502. There is a possibility that the position of the second rail 501 in the height direction is restricted. Therefore, in order to fasten the front frame 502 and the second rail 501 with the screws 508, it is desirable that the size of the screw holes 509 provided in the front frame 502 is larger than the diameter of the screws 508 to have play.

  In addition, not only the second rails 501 and 511 but also the reference of the lens unit 210 and the reference of the drive shaft are arranged on the front and rear frames in the front and rear frames (front frame 502 and rear frame 512). Therefore, by arranging these on the same plane of the front and rear frames, not only the front-rear deviation and the deviation in the traveling direction of the second rails 501 and 511, but also the variation from the lens unit 210 and the like are reduced.

[Configuration example 2]
Next, configuration example 2 will be described. In the configuration example 1, since the thickness of the protrusion shape 503 shown in FIG. 1 and the width w of the positioning hole 504 in the short direction are the same, it is difficult to insert the protrusion shape 503 into the positioning hole 504, and the second rail 501 It is considered that when attaching to the front frame 502, the protrusion shape 503 and the positioning hole 504 may be damaged or the productivity may be deteriorated due to difficulty in assembling.

  On the other hand, in this configuration example, a positioning hole 514 as shown in FIG. 12 is formed in the front frame 502 as shown in FIG. The positioning hole 514 is formed by communicating a hole 514 a having the same width in the short direction as the plate thickness of the protrusion shape 503 and a hole 514 b having a width in the short direction larger than the plate thickness of the protrusion shape 503. Then, the projection shape 503 provided on the second rail 501 is inserted into the hole 514b, and then the projection shape 503 is slid into the hole 514a portion to fit the projection shape 503 and the hole 514a. The second rail 501 is positioned with respect to 502.

  Further, as shown in FIG. 11, the positioning hole 514 is provided on the opposite side of the home position (the upper left end in FIG. 11 of the second rail 701) to widen the width in the short direction as shown in FIG. When the protrusion 503 inserted into the hole 514b and the hole 514a are fitted to each other, the second rail 501 is slid toward the home position side with respect to the front frame 502 as shown in FIG. And by making it slide in this way, it can be arranged so that the right frame 701 and the end of the second rail 501 are adjacent to each other as shown by a circled portion in FIG.

  On the contrary, when the hole 514b is disposed on the home position side of the positioning hole 514 and the width in the short direction is widened, when the protrusion shape 503 inserted into the hole 514b is fitted to the hole 514a In addition, the second rail 501 is slid to the opposite side of the home position with respect to the front frame 502. Therefore, a gap corresponding to the slide is generated between the right frame 701 and the end of the second rail 501. Since the second carriage 163 cannot be arranged and scanned in the gap, the home position of the second carriage 163 on the second rail 501 is inward of the traveling body traveling direction of the housing 160 by the gap, and a useless space is generated. Therefore, the scanner 150 is increased in size.

[Configuration example 3]
Next, Configuration example 3 will be described. In FIG. 15, one long hole 551 and 552 perpendicular to the traveling direction of the second carriage 163 is provided in the second rail 501 and the front frame 502, respectively. When the second rail 501 is attached to the front frame 502, the long holes 551 and 552 provided in the second rail 501 and the front frame 502 have at least the same width as the width in the short direction of the long holes 551 and 552. By inserting a jig such as a pin having a diameter, the second rail 501 can be positioned with respect to the front frame 502 in the traveling body traveling direction. Further, after the second rail 501 and the front frame 502 are fastened with the screws 508 in such a state that the traveling body traveling direction is positioned, it is not necessary to insert a jig into the long holes 551 and 552. The jig is extracted from the long holes 551 and 552.

  As shown in FIG. 15, the second rail 501 includes a lens unit 210 including an imaging lens 200, a CCD 221 and an SBU 220 supported by a beam plate 164 fixed to the housing 160, and a first carriage 162 and a second carriage 163. A traveling body positioning hole 553 used for positioning the first carriage 162 and the second carriage 163 in the traveling direction is provided with respect to the second rail 501 so that the distance in the traveling direction is a predetermined distance.

  Although not shown, the first carriage 162 and the second carriage 163 are also provided with holes corresponding to the traveling body positioning holes 553. When the first carriage 162 and the second carriage 163 are assembled to the housing 160, holes corresponding to the traveling body positioning holes 553 provided in the first carriage 162 and the second carriage 163, respectively, coaxially with the traveling body positioning holes 553. And jigs such as pins are inserted into the holes and the traveling body positioning holes 553. Accordingly, the first carriage 162 and the second carriage 163 can be assembled in a state where the first carriage 162 and the second carriage 163 are positioned in the traveling direction with respect to the second rail 501. Further, after the first carriage 162 and the second carriage 163 are assembled, the jig is removed from the traveling body positioning hole 553 and the like.

  Here, not only the second rail 501 but also the lens unit 210 and the like are arranged on the front frame 502 in the front frame 502. Further, as described above, the second rail 501 is fastened to the front frame 502 while being positioned in the traveling body traveling direction by the long hole 552 and the jig. Therefore, the first carriage 162 and the second carriage 163 are positioned in the traveling direction with respect to the second rail 501 attached to the front frame 502 on which the lens unit 210 is provided. The first carriage 162 and the second carriage 163 are positioned in the traveling direction.

  Therefore, the distance in the traveling direction between the first carriage 162 and the second carriage 163 with the lens unit 210, the position in the traveling direction on the document surface, and the like can be made appropriate when the apparatus main body is assembled.

[Configuration Example 4]
Next, Configuration example 4 will be described. As shown in FIG. 16, when two or more protrusion shapes 503 of the second rail 501 and positioning holes 514 of the front frame 502 are provided, one of them is a positioning reference in the traveling direction of the traveling body of the second rail 501 with respect to the front frame 502. To do. In this configuration example, the projection shape 503 on the c side and the positioning hole 514 in the drawing are used as the positioning reference for the traveling direction of the second rail 501 with respect to the front frame 502, and in the drawing of the projection shape 503 on the c side in the drawing. The end of the left side (traveling direction home position side) is abutted against the inner wall of the hole 514a on the left side (longitudinal direction home position side) in the drawing (the portion surrounded by the circle on the c side in FIG. 16). Thus, the protrusion shape 503 is abutted against the inner wall in the longitudinal direction of the positioning hole 514, whereby the traveling direction of the traveling body of the second rail 501 with respect to the front frame 502 can be determined.

  Further, with respect to the projection shape 503 on the d side and the positioning hole 514 in the other drawing, as shown in FIG. 16, between the left end of the projection shape 503 in the drawing and the inner wall on the left side in the drawing of the hole 514a. A gap is left (a part surrounded by a circle on the d side in FIG. 16). If the end portion of the projection shape 503 on the d side and the inner wall of the hole 514b are abutted against each other in the drawing, depending on the processing accuracy of the projection shape 503 and the positioning hole 514, the projection shape 503 on the c side in the drawing is illustrated. Before the left end hits the inner wall on the left side of the hole 514 in the drawing, the end of the protrusion shape 503 on the d side in the drawing may hit the inner wall of the hole 514a. In this case, since a gap is formed between the end portion of the protrusion shape 503 on the c side in the drawing and the inner wall of the hole 514a, positioning of the second rail 501 with respect to the front frame 502 by the gap in the traveling direction of the traveling body. The position will shift.

  Therefore, as in this configuration example, it is not the positioning reference in the traveling direction of the traveling body of the second rail 501 with respect to the front frame 502. The left end portion of the projection shape 503 on the d side in the drawing and the inner wall on the left side in the drawing of the hole 514a. In this way, the second rail 501 is reliably positioned in the traveling direction of the second rail 501 with respect to the front frame 502 by the projection shape 503 and the positioning hole 514 on the c side in the drawing. it can.

  Further, as a positioning reference in the traveling direction of the traveling body of the second rail 501 with respect to the front frame 502, the projection shape 503 on the d side in the drawing is used instead of the projection shape 503 and the positioning hole 514 on the c side in the drawing as in this configuration example. And the positioning hole 514.

[Configuration Example 5]
Next, Configuration example 5 will be described. As shown in FIG. 17, a hook shape 554 is provided in the second rail 501, and a hook hole 555 in which the hook shape 554 is hooked is provided in the front frame 502. The hook shape 554 is hooked in the hook hole 555 by sliding the second rail 501 in the upper left direction in FIG. That is, when the protrusion shape 503 is inserted into the hole 514b of the positioning hole 514 and the second rail 501 is slid in the upper left direction in FIG. 17 to engage the hole 514a and the protrusion shape 503, the hook shape 554 is hooked. It is configured to be hooked in the hole 555.

  Therefore, after the protrusion shape 503 and the positioning hole 514 are fitted and the second rail 501 is positioned with respect to the front frame 502, the hook shape 554 is hooked on the hook hole 555 as shown in FIG. Therefore, when the second rail 501 and the front frame 502 are fastened with the screws 508, the second rail 501 and the front frame 502 do not come out in the insertion direction of the screws 508. Therefore, the second rail 501 is not detached from the front frame 502 during the screw tightening operation when the second rail 501 and the front frame 502 are fastened with the screws 508, and it is possible to prevent the mounting work time from being wasted. The productivity of the apparatus can be improved.

As described above, according to the present embodiment, the light source unit 190 that is a light source that irradiates light to the image reading object, the mirror that is the deflecting unit that deflects the reflected light reflected by the image reading object, and the light deflected by the mirror. A CCD 221 that is a light receiving unit that receives light, an SBU 220 that is an image information generation unit that generates image information based on the light received by the CCD 221, and at least the mirror is installed along the surface to be read of the image reading object. The first carriage 162 and the second carriage 163 which are movable traveling bodies, and a guide for guiding the second carriage 163 in the traveling body traveling direction which is the moving direction when the second carriage 163 moves along the surface to be read. A second rail 501 that is a guide member having a rail running surface 505 that is a surface, and a support that is provided in the apparatus body and supports the second rail 501 In a scanner 150, which is an image reading apparatus including a front frame 502 that is a material, a part of a side wall forming the rail traveling surface 505 is extended in parallel to the rail traveling surface 505 in a direction perpendicular to the traveling body traveling direction. A protrusion shape 503 that is a protrusion provided to protrude from the two rails 501, and a positioning hole 504 provided in the front frame 502 that fits the protrusion shape 503 and positions the second rail 501 with respect to the front frame 502. possess a 514, to form an upper surface and the rail running surface 505 of the projection-shaped 503 on the same plane. Thereby, the protrusion shape 503 becomes a reference in the height direction of the second rail 501 with respect to the front frame 502. That is, the positioning in the height direction is performed on the same plane as the rail running surface 505 of the projection shape 503 fitted in the positioning hole 504 provided in the front frame 502. Thereby, since the positioning in the height direction is substantially the same as that performed on the rail running surface 505, the positioning hole 504 and the rail running surface 505 when the projection shape 503 is fitted into the positioning hole 504 are arranged. The positional relationship in the height direction does not change as in the conventional image reading apparatus. Therefore, there is no above-described tolerance regarding the positional relationship in the height direction between the positioning hole 504 and the rail running surface 505, and the stacking tolerance when the second rail 501 is attached to the front frame 502 is reduced. Therefore, the positioning accuracy in the height direction of the rail running surface 505 with respect to the front frame 502 can be improved.
Further, according to the present embodiment, the positioning hole 514 communicates in the traveling direction of the traveling body, the hole 514a having the same plate thickness as the protrusion shape 503 and the width in the short direction, and the shorter direction than the plate thickness of the protrusion shape 503. The hole 514b has a large width. Accordingly, when the second rail 501 is attached to the front frame 502 by inserting the projection shape 503 into the hole 514b and then sliding the projection shape 503 in the traveling body moving direction to fit the projection shape 503 and the hole 514a. There is less risk of component damage, and the work time for attaching the second rail 501 to the front frame 502 can be shortened, so that the productivity of the product can be improved.
In addition, according to the present embodiment, the second rail is provided by providing the hole 514b on the opposite side to the home position that is the initial position on the rail travel surface 505 of the second carriage 163 in the traveling body travel direction of the positioning hole 514. Since the second rail 501 can be attached to the front frame 502 in a state where the second rail 501 is close to the vicinity of the right frame 701 in the traveling body traveling direction of 501, there is no wasted space as described above, and the scanner 150 Miniaturization can be achieved.
Further, according to the present embodiment, by providing the long holes 551 and 552 that are long in the direction orthogonal to the traveling body traveling direction on the mutually opposing side walls of the second rail 501 and the front frame 502, As described above, since the positioning of the second rail 501 in the traveling body traveling direction can be performed with high accuracy, a better image can be obtained.
Further, according to the present embodiment, the second rail 501 is positioned in the traveling body traveling direction with respect to the front frame 502 by bringing the protrusion shape 503 into contact with the inner wall of the positioning hole 514 in the traveling body traveling direction. Further, since the positioning of the second rail 501 in the traveling direction of the traveling body can be performed with high accuracy without using a special jig such as a pin, a better image can be obtained.
Further, according to the present embodiment, the hook shape 554 provided on the second rail 501 and the hook hole 555 on which the hook shape 554 provided on the front frame 502 is hooked are provided. Thereby, when the second rail 501 and the front frame 502 are fastened with the screw 508, the second rail 501 and the front frame 502 are inserted into the screw 508 because the hook shape 554 is hooked in the hook hole 555. It does not come out in the direction. Therefore, during the screw tightening operation when the second rail 501 and the front frame 502 are fastened with the screws 508, the second rail 501 is not detached from the front frame 502, and the work efficiency is improved, so that the product productivity is improved. be able to.
In addition, according to the present embodiment, in an image forming apparatus including an image reading unit that reads information about an image from an image reading object, and an image forming unit that forms an image based on the information read by the image reading unit. By using the scanner 150, which is the image reading apparatus of the present invention, as the image reading means, the above-described effects can be obtained and a good image can be formed.

  In the scanner 150 of the present embodiment, the first rail is formed integrally with the housing 160, but the first rails 601 and 611 are provided separately from the housing 160, and the front and rear are the same as the second rails 501 and 511. When the first rails 601 and 611 are attached to the frame by screws or the like, the first rail 601 can be applied to the front and rear frames by applying the above-described configuration examples to the first rails 601 and 611 and the like. , 611, the positioning accuracy in the height direction of the traveling surface on which the first carriage 162 travels can be improved.

FIG. 4 is an enlarged view of the front frame side of the scanner according to Configuration Example 1. 1 is a schematic configuration diagram of a copier according to an embodiment. Partially enlarged configuration showing an enlarged part of the internal configuration of the copier. The elements on larger scale which show a part of tandem part of the copier. FIG. 2 is a perspective view showing an ADF and a scanner of the copier. The fragmentary perspective view which shows the scanner partially. The block diagram which shows the movement reading part of the scanner from the side. 2 is a perspective view of a scanner according to Configuration Example 1. FIG. The enlarged view of the front frame side in the conventional image reading apparatus. FIG. 5 is a schematic diagram of positioning holes provided in the frame of Configuration Example 1; FIG. 6 is an enlarged view of a front frame side of a scanner according to Configuration Example 2. FIG. 6 is a schematic diagram of positioning holes provided in the frame of Configuration Example 2. The schematic diagram which showed the state before a protrusion shape and the hole for positioning fit. The schematic diagram which shows the state which protrusion shape and the hole for positioning were fitted. FIG. 10 is an enlarged view of a front frame side of a scanner according to Configuration Example 3. FIG. 10 is an enlarged view of a front frame side of a scanner according to Configuration Example 4; FIG. 10 is an enlarged view of a front frame side of a scanner according to Configuration Example 5. The enlarged view of the front frame side at the time of hooking a hook shape in the hole which is a hook part provided in the frame. FIG. 6 is a schematic diagram showing a scanner of a conventional copying machine viewed from the side. FIG. 9 is a partial schematic configuration diagram partially showing a scanner of a conventional copying machine.

Explanation of symbols

140 Operation unit 150 Scanner 155 Contact glass 160 Housing 162 First carriage 163 Second carriage 190 Light source unit 200 Imaging lens 210 Lens unit 220 SBU
221 CCD
501 Second frame 502 Front frame 503 Projection shape 504 Positioning hole 505 Rail running surface 506 Wall surface 507 Long hole shape 508 Screw 514 Positioning hole 551 Long hole 552 Long hole 553 Running body positioning hole 554 Hook shape 555 Hook hole 701 Right frame

Claims (7)

A light source for irradiating the image reading object with light
Deflection means for deflecting reflected light reflected by the image reading object;
A light receiving means for receiving the light deflected by the deflecting means;
Image information generating means for generating image information based on the light received by the light receiving means;
A traveling body in which at least the deflection unit is installed and movable along a surface to be read of the image reading object;
A guide member having a guide surface for guiding the traveling body in the moving direction when the traveling body moves along the surface to be read;
In an image reading apparatus provided with a support member provided in the apparatus main body and supporting the guide member,
A protruding portion provided by extending a part of the side wall on which the guide surface is formed in a direction perpendicular to the moving direction in parallel to the guide surface and protruding from the guide member;
The combined the guide member fitted with projecting portions for positioning relative to the support member, have a positioning hole provided in the support member,
An image reading apparatus , wherein the upper surface of the protruding portion and the guide surface are formed on the same plane . The image reading apparatus according to claim 1.
The positioning hole communicates in the moving direction, the first hole portion having the same dimension in the direction orthogonal to the moving direction as the orthogonal direction of the protruding portion, and the dimension in the orthogonal direction is the protruding portion. An image reading apparatus comprising: a second hole portion that is larger than the direction perpendicular to the first hole portion. The image reading apparatus according to claim 2.
An image reading apparatus, wherein the second hole portion is provided on the opposite side of the positioning hole in the moving direction with respect to the initial position on the guide surface of the traveling body. The image reading apparatus according to claim 1, 2 or 3.
An image reading apparatus, wherein a long hole elongated in a direction orthogonal to the moving direction is provided in each of the side walls of the guide member and the support member facing each other. The image reading apparatus according to claim 1, 2 or 3.
An image reading apparatus characterized in that the guide member is positioned in the moving direction with respect to the support member by bringing the protruding portion into contact with an inner wall of the positioning hole in the moving direction. The image reading apparatus according to claim 1, 2, 3, 4 or 5.
A hook shape provided on the guide member;
An image reading apparatus comprising: a hook portion provided on the support member to which the hook shape is hooked. Image reading means for reading information about the image from the image reading object;
An image forming apparatus comprising: an image forming unit that forms an image based on the information read by the image reading unit;
7. An image forming apparatus comprising the image reading device according to claim 1, 2, 3, 4, 5 or 6 as the image reading means.

Images