JP5515802B2 - Reader - Google Patents

Description

The present invention relates to a reading device.

  2. Description of the Related Art Conventionally, a reading device that reads a document placed on a transparent document table is known (see, for example, Patent Document 1). In the reading apparatus of Patent Document 1, spacers made of a material having good slidability are arranged before and after the carriage (sensor holder) including the image sensor in the moving direction. When reading an image written on a document by the reading device of Patent Document 1, the spacer is slid with respect to the guide shaft, and the sensor holder is moved along the guide shaft. Then, the image sensor is scanned in parallel with the platen glass.

JP 2008-35172 A

  However, in the above-described conventional reading device, the carriage feeding accuracy may be reduced due to, for example, vibration of the carriage, depending on the dimensional accuracy of the sliding member that slides on the guide shaft, such as a spacer, and the mounting structure with respect to the carriage. . Such a decrease in carriage feed accuracy has been a factor in reducing the reading accuracy of the image sensor.

Therefore, the present invention provides a reading apparatus that can prevent a decrease in reading accuracy even when a sliding member is used for a carriage.

In order to solve the above-described problems, a reading apparatus according to the present invention supports an image sensor that detects light reflected by a reading target, a carriage that holds the image sensor, and a carriage that is slidable in one direction. And a sliding member fixed to the carriage and in contact with the guide rail, wherein the carriage has a recess for holding the sliding member, and the sliding The member is engaged with the concave portion in an elastically deformed state, and is disposed on the front side in the moving direction of the carriage when the reading target is read .

With this configuration, when the sliding member is engaged with the concave portion of the carriage, an elastic force due to elastic deformation of the sliding member can be applied between the sliding member and the concave portion of the carriage. . Therefore, for example, even when the dimensional accuracy of the sliding member is not so high, the sliding member can be attached to the concave portion of the carriage with high accuracy in a stable state without rattling. This prevents the carriage feed accuracy from being lowered due to, for example, carriage vibration. Therefore, according to the reading device of the present invention, it is possible to prevent the reading accuracy of the image sensor from being lowered.
In addition, even when a force toward the guide rail acts on a portion on the front side in the movement direction of the carriage during the movement of the carriage, the sliding member causes the front portion in the movement direction of the carriage and the guide rail to The frictional resistance between the two can be reduced. Therefore, vibration of the carriage and the like can be prevented, and a decrease in carriage feed accuracy can be prevented.

  In the reading device according to the present invention, the sliding member includes an elastic portion provided so as to be elastically deformable, and a contact portion that contacts the guide rail, and is along the guide rail of the elastic portion. An area of a cross section is smaller than an area of a cross section along the guide rail of the contact portion.

  With this configuration, it is possible to facilitate the elastic deformation of the elastic portion and to ensure the strength of the contact portion.

  Further, in the reading device of the present invention, the sliding member has a protruding portion protruding in a direction along the guide rail and a direction intersecting the guide rail, and the carriage is engaged with the protruding portion. It has the engaging part to do.

  With this configuration, when the sliding member is engaged with the concave portion of the carriage, the portion excluding the protruding portion of the sliding member is accommodated in the concave portion from the direction along the guide rail, and finally the protruding portion of the sliding member. The part can be engaged with the engaging part. Therefore, the sliding member can be easily attached to the carriage. Further, when the protrusion is engaged with the engaging portion, the portion of the protrusion that protrudes in the direction intersecting with the guide rail can be brought into contact with the carriage. Accordingly, the sliding member can be positioned with respect to the carriage in the direction along the guide rail.

  The reading device of the present invention is characterized in that the recess has a first holding surface and a second holding surface provided so as to cross each other along the guide rail.

  With this configuration, the sliding member is elastically deformed, and the sliding member abuts against the first holding surface and the second holding surface in a state where the sliding member is urged against the first holding surface and the second holding surface. Can be made. Then, due to the frictional resistance between the first holding surface and the second holding surface and the sliding member, the sliding member can be attached to the concave portion of the carriage with high accuracy in a stable state without rattling.

  Further, the sliding structure of the present invention includes a guide rail, a slide portion provided so as to be slidable with respect to the guide rail, and a sliding member fixed to the slide portion and contacting the guide rail. The slide structure includes a recess that holds the slide member, and the slide member is engaged with the recess in an elastically deformed state.

  By comprising in this way, when the sliding member is engaged with the recessed part of a slide part, the elastic force by the elastic deformation of a sliding member can be made to act between a sliding member and a recessed part. Therefore, for example, even when the dimensional accuracy of the sliding member is not so high, the sliding member can be attached to the concave portion of the sliding member with high accuracy in a stable state without rattling. As a result, it is possible to prevent the feeding accuracy of the slide portion from being lowered due to, for example, vibration. Therefore, the reading accuracy of the image sensor can be prevented from being lowered by applying the sliding structure of the present invention to, for example, the carriage of the image sensor.

It is a top view of the reading apparatus in the embodiment of the present invention. It is a perspective view of the reading apparatus shown in FIG. It is a schematic block diagram which shows the system configuration | structure of the reader shown in FIG. FIG. 2 is an enlarged perspective view of a carriage of the reading apparatus shown in FIG. It is a perspective view of the sliding member with which the carriage of the reading apparatus shown in FIG. 1 is provided. It is sectional drawing which shows the contact state of the sliding member shown in FIG. 5, and a guide rail.

  Hereinafter, embodiments of a reading apparatus and a reading method of the present invention will be described in detail with reference to the drawings. In the present embodiment, two different reading methods can be executed: a reading method in which the image sensor is scanned while the reading object is stationary, and a reading method in which the reading object is moved while the image sensor is stationary. The apparatus will be described.

  FIG. 1 is a plan view of the reading apparatus according to the present embodiment. FIG. 2 is a perspective view of the reading apparatus shown in FIG. FIG. 3 is a block diagram showing an outline of the system configuration of the reading apparatus shown in FIG. FIG. 4 is an enlarged perspective view of the carriage of the reading apparatus shown in FIG.

As shown in FIGS. 1 and 2, the reading device SCN includes a document support unit 1 that supports a document to be read, and a cover unit 2 that is provided on the document support unit 1 so as to be openable and closable.
Inside the document support unit 1, a reading unit 3 including an image sensor and a driving unit 4 that drives the reading unit 3 are provided. Although not shown in FIGS. 1 and 2, the reading device SCN measures and records the document reading unit and the conveyance amount, and the conveyance unit 5 that conveys the document as shown in FIG. 3. A counting unit 6 and a control unit 7 for controlling each unit of the reading device SCN are provided.

  As shown in FIGS. 1 and 2, the document support unit 1 includes a casing 13 in which a document support surface 1 a that supports a document is provided with two large and small rectangular first openings 11 and second openings 12. have. The reading unit 3 is provided so as to be movable within a range R between a position P1 in the formation region of the first opening 11 and a position P2 applied to one outer edge of the second opening 12. The length L1 of the first opening 11 in the moving direction of the reading unit 3 is shorter than the length L2 of the second opening 12 in the same direction. The length L1 of the first opening 11 in the same direction is, for example, about the same size to several times as the length L3 of the reading unit 3 in the same direction. The second opening 12 is provided with a size that is slightly larger than the size of the readable document, for example.

  A translucent sheet 14 made of a material such as a transparent resin that transmits light is disposed in the first opening 11. In addition, a placement glass 15 made of a material such as transparent glass that transmits light is disposed in the second opening 12. The placement glass 15 places and supports a document when the document is read in a scanning reading mode to be described later.

  The reading unit 3 includes a light source and an image sensor (not shown), and a carriage 33 that holds them. As the light source, for example, LEDs of R, G, B, and three colors are used. The light source radiates the emitted R, G, and B light through the translucent sheet 14 or the placement glass 15 and irradiates the original. For example, a contact image sensor (CIS) is used as the image sensor. The CIS uses, for example, a sensor having the same width as that of the original, and is an equal-magnification lens in which light emitted from a light source, reflected by the original, and transmitted through the translucent sheet 14 or the placement glass 15 is arranged in a line corresponding to each pixel. By using this array, an image of a document, characters, and the like are read.

  The drive unit 4 includes a belt 41 fixed to the carriage 33 of the reading unit 3, a pair of pulleys 42 and 43 that drive the belt 41, a motor 44 that drives the pulley 42, and a guide rail 45 that guides the carriage 33. have. The belt 41 is stretched around a pair of pulleys 42 and 43 disposed on both sides inside the housing 13 and is disposed substantially parallel to the moving direction of the reading unit 3.

  The guide rail 45 is a round bar-shaped member having both ends fixed to the housing 13 and disposed substantially parallel to the moving direction of the reading unit 3. A groove-like engagement sliding portion 33 a provided on the carriage 33 of the reading unit 3 is engaged with the guide rail 45. The guide rail 45 is engaged with the engagement sliding portion 33 a of the carriage 33, thereby restricting the moving direction of the carriage 33 and supporting the carriage 33 slidably along the guide rail 45.

FIG. 4 is an enlarged perspective view of the carriage 33. In FIG. 4, the guide rail 45 is not shown.
As shown in FIG. 4, the engagement sliding portion 33 a of the carriage 33 is configured by a sliding member 34 that is fixed to the carriage 33 and that contacts the guide rail 45, and a concave portion 35 that holds the sliding member 34. Yes. The sliding member 34 is made of a low friction material such as polyacetal (Polyacetal, POM), polytetrafluoroethylene (Polytetrafluoroethylene, PTFE), polychlorotrifluoroethylene (Poly Chloro Tri Furuoro Ethylene, PCTFE).

FIG. 5 is a perspective view showing the sliding member 34 in a state where it is removed from the recess 35 of the carriage 33 shown in FIG. FIG. 6 is a cross-sectional view showing a contact state between the sliding member 34 attached to the recess 35 and the guide rail 45.
As shown in FIGS. 5 and 6, the sliding member 34 is a long and thin plate-like member extending in one direction, and both ends in the longitudinal direction are formed in a substantially semicircular shape in a side view. An elastic portion 34 a that can be elastically deformed is provided at the center of the sliding member 34. On both sides of the elastic portion 34a, contact portions 34b that contact the guide rail 45 when the elastic portion 34a is elastically deformed are provided.

  The thickness Ta of the elastic portion 34a is formed thinner than the thickness Tb of the contact portions 34b provided on both sides thereof. Further, the width Wa of the elastic part 34a is equal to the width Wb of the contact part 34b. Thus, in this embodiment, by making the thickness Ta of the elastic part 34a thinner than the thickness Tb of the contact part 34b, the area of the cross section parallel to the guide rail 45 of the elastic part 34a can be reduced. It is formed so as to be smaller than the area of the cross section parallel to the guide rail 45.

  As shown in FIG. 4, the abutting portion 34b is held against the guide rail 45 in a state where the sliding member 34 is held in the recess 35 of the carriage 33 and the sliding member 34 is elastically deformed as shown in FIG. A part of the contact surface 34 c comes into contact with the surface of the guide rail 45. Here, the contact surface 34c and the guide rail 45 contact each other in a state close to a line contact. Further, the peripheral edge portion of the contact surface 34c is chamfered. The contact portion 34b has a protrusion 34d that protrudes in the width Wb direction and the thickness Tb direction.

  As shown in FIG. 1, the protrusion 34 d has a direction substantially parallel to the guide rail 45 and a direction substantially perpendicular to the guide rail 45 in a state where the engagement sliding portion 33 a of the carriage 33 is engaged with the guide rail 45. It is provided so as to protrude from each. The protrusion 34d has a substantially pentagonal shape in which one corner of a quadrangle is obliquely cut off to provide a hypotenuse and all corners are rounded when viewed from a side parallel to the guide rail 45. ing. The protrusion 34d is provided such that a pentagonal surface with rounded corners is perpendicular to the width Wb direction and parallel to the thickness Tb direction. The protruding portion 34d is configured such that a portion provided with a hypotenuse of a substantially pentagonal surface protrudes from the contact portion 34b in the thickness Tb direction.

  As shown in FIG. 4, the concave portion 35 provided in the carriage 33 has a first holding surface 35a and a second holding surface 35b provided in a substantially V shape so as to cross each other. A rectangular groove 35c having a rectangular shape in cross section is provided between the first holding surface 35a and the second holding surface 35b. As shown in FIG. 1, the first holding surface 35 a and the second holding surface 35 b are provided substantially parallel to the guide rail 45 in a state where the engagement sliding portion 33 a of the carriage 33 is engaged with the guide rail 45. Yes. On the front side of the concave portion 35 in the movement direction of the carriage 33, an engaging portion 35 d is provided in the vicinity of the opening edge of the concave portion 35 so as to engage the protruding portion 34 d of the sliding member 34.

  As shown in FIG. 4, each engagement portion 35 d of the carriage 33 is provided corresponding to the shape of the portion of each protrusion 34 d on the end portion side in the longitudinal direction of the sliding member 34. That is, the engaging portion 35d has a shape along the outer shape of the portion outside the substantially pentagonal projection 34d (on the end side in the longitudinal direction of the sliding member 34) in plan view.

  Specifically, the engaging portion 35d has a surface provided so as to be in contact with the surface forming the hypotenuse of the substantially pentagonal projection 34d in plan view and along the vertical direction. Further, the engaging portion 35d provided on the first holding surface 35a side of the concave portion 35 is in contact with the surface forming the side adjacent to the oblique side with the substantially pentagonal surface of the projection 34d, and the first holding surface 35a. And a surface provided so as to intersect substantially perpendicularly. Further, the engaging portion 35d provided on the second holding surface 35b side of the concave portion 35 is in contact with the surface forming the side adjacent to the oblique side of the guide rail 45 with the substantially pentagonal surface of the protruding portion 34d. It has a surface provided so as to intersect the second holding surface 35b substantially perpendicularly.

  When the sliding member 34 is engaged with the concave portion 35 of the carriage 33, first, the contact portion 34b of the sliding member 34 is held, and the contact surfaces 34c of the contact portion 34b are opposed to each other. The elastic part 34a is elastically deformed. Then, the sliding member 34 in an elastically deformed state is accommodated in the recess 35. Next, the projecting portion 34d is engaged with the engaging portion 35d so as to restore the elastically deformed elastic portion 34a, and the contact portion 34b is supported by the first holding surface 35a and the second holding surface 35b of the recess 35. Thus, the restoration of the elastic portion 34a is restricted.

  As a result, the sliding member 34 is engaged with the recess 35 of the carriage 33 in an elastically deformed state, and is fixed to the carriage 33. At this time, due to the elastic force of the elastic portion 34a, each contact portion 34b is biased toward the first holding surface 35a and the second holding surface 35b of the recess 35. Further, the projecting portion 34d is biased toward the engaging portion 35d by the elastic force of the elastic portion 34a. In this way, the sliding member 34 is fixed to the concave portion 35 of the carriage 33, and a groove-like engaging sliding portion 33 a that engages with the guide rail 45 is formed.

  That is, in this embodiment, the guide rail 45, the carriage (sliding portion) 33 provided so as to be slidable with respect to the guide rail 45, and the sliding member 34 fixed to the carriage 33 and abutting on the guide rail 45 Thus, a sliding structure for sliding the carriage 33 is configured.

  As shown in FIGS. 1 and 2, the cover unit 2 is attached to the document support unit 1 via a hinge unit 21, and can be opened and closed with respect to the document support unit 1 in an angle range of 0 ° to about 90 °. It has been. In addition, the cover unit 2 of the present embodiment includes a transport unit 5 (see FIG. 3) that transports a document.

  The transport unit 5 includes, for example, a plurality of transport rollers and driven rollers (not shown), and a document guide (not shown) that is arranged along the document transport path and defines the document transport direction. The plurality of transport rollers and the driven roller are arranged along the document transport path, and the document roller is transported along the document guide by rotating the transport roller while the document is sandwiched between the transport roller and the driven roller. It is supposed to be. The transport unit 5 transports a document supplied from a document tray (not shown) of the cover unit 2 using a transport roller and a driven roller. The document is moved so as to pass over the first opening 11 of the document support unit 1, and then discharged to a document discharge tray (not shown) provided in the cover unit 2.

  As shown in FIG. 3, the conveyance unit 5 is provided with a counting unit 6 that measures the number of originals read and the conveyance amount. Here, the number of readings is the total number of documents conveyed by the conveying unit 5 and passed through the first opening 11 within a predetermined period. The carry amount is the sum of the lengths in the carrying direction of the originals carried by the carrying unit 5 within a predetermined period. The counting unit 6 includes, for example, a sensor that detects a document that passes through the transport unit 5, a sensor that detects the length of the transported document, an encoder that measures the number of rotations of the transport roller, and a memory.

  The control unit 7 illustrated in FIG. 3 includes, for example, a plurality of memories and a calculation unit. The control unit 7 transmits a control signal C5 to the conveyance unit 5 to convey the document to the conveyance unit 5 and allow the document to pass through the first opening 11. The control unit 7 receives and records an output signal D5 such as a conveyance state from the conveyance unit 5. The control unit 7 transmits and controls the control signal C6 to the counting unit 6, and receives and records the output signal D6 such as the number of conveyances (reading number) and the conveyance amount from the counting unit 6. Yes.

  Further, the control unit 7 moves the reading unit 3 by transmitting the control signal C4 to the driving unit 4 to drive it, and receives an output signal D4 such as position information of the reading unit 3 from the driving unit 4. It has become. In addition, the control unit 7 controls the light source and the image sensor of the reading unit 3 by transmitting a control signal C3 and receives the output signal D3 of the image sensor from the reading unit 3.

  The control unit 7 is configured to switch between the scanning reading mode and the conveyance reading mode, for example, by operating a button on an operation panel (not shown). In the scanning reading mode, the control unit 7 places the reading unit 3 in parallel with the mounting glass 15 in a state where the document is mounted on the mounting glass 15 of the second opening 12 of the document support unit 1 shown in FIG. The document is read by scanning from one end to the other end of the second opening 12 in the length L2 direction. In the conveyance reading mode, the control unit 7 moves the reading unit 3 below the translucent sheet 14 disposed in the second opening 12 of the document support unit 1 shown in FIG. Thus, the document is read while being moved with respect to the reading unit 3.

Hereinafter, the operation of the reading device SCN to which the sliding structure of the present embodiment is applied will be described.
First, a scanning reading mode in which the document is read by scanning the reading unit 3 while the document is stationary will be described.
First, the cover unit 2 shown in FIG. 1 is opened, and the document is set at a predetermined position on the placement glass 15 disposed in the second opening 12 of the document support unit 1. Thereafter, the cover unit 2 is closed, and the document is held between the cover unit 2 and the placement glass 15. Then, a reading button on an operation panel (not shown) of the reading device SCN is pressed to start reading a document.

  Then, as illustrated in FIG. 3, the control unit 7 transmits a control signal C <b> 4 to the drive unit 4 to drive the drive unit 4. Then, the reading unit 3 is moved from the initial position between the first opening 11 and the second opening 12 toward the second opening 12. Next, the control unit 7 transmits the control signal C4 to drive the drive unit 4, and moves the reading unit 3 with respect to the document on the placement glass 15, while outputting the output signal D3 of the image sensor of the reading unit 3. Receive. Then, the reading unit 3 is scanned from the end of the original on the initial position side to the end on the opposite side. Thereby, it is possible to read a document set on the placement glass 15.

  Here, in the reading device SCN of the present embodiment, the carriage 33 is provided with a recess 35 for holding the sliding member 34, and the sliding member 34 is engaged with the recess 35 in an elastically deformed state. Therefore, when the sliding member 34 is engaged with the concave portion 35 of the carriage 33, the contact portions 34 b provided on both sides of the elastic portion 34 a are elastically deformed so that the first holding surface 35 a and the first holding surface 35 a of the concave portion 35 are formed. 2 The state is biased toward the holding surface 35b. In addition, due to the elastic deformation of the elastic portion 34a, the protruding portion 34d is biased toward the engaging portion 35d.

  Thereby, for example, even when the dimensional accuracy of the sliding member 34 is not so high, the sliding member 34 can be attached to the concave portion 35 of the carriage 33 with high accuracy in a stable state without rattling. Thereby, for example, the feeding accuracy of the carriage 33 is prevented from being lowered due to vibration of the carriage 33 or the like. Therefore, according to the reading device SCN of the present embodiment, it is possible to prevent the reading accuracy of the image sensor from being lowered.

  The sliding member 34 has an area of a cross section along the guide rail 45 of the elastic portion 34a smaller than an area of a cross section along the guide rail 45 of the contact portion 34b. For this reason, the section modulus of the elastic portion 34a is smaller than the section modulus of the contact portion 34b. Further, the thickness Ta of the elastic portion 34a is formed thinner than the thickness Tb of the contact portion 34b. Therefore, the section modulus of the elastic part 34a can be reduced more effectively. Therefore, the elastic portion 34a can be easily elastically deformed. In addition, the strength of the contact portion 34b can be ensured.

  The abutting portion 34 b has a protruding portion 34 d that protrudes in a direction substantially parallel to the guide rail 45 and a direction that intersects the guide rail 45 substantially perpendicularly. The carriage 33 has an engaging portion 35d with which the protruding portion 34d is engaged. Therefore, when the sliding member 34 is engaged with the recess 35 of the carriage 33, the portion of the sliding member 34 excluding the protrusion 34 d is accommodated in the recess 35 from the direction along the guide rail 45, and finally the sliding member 34. The protrusion 34d can be engaged with the engaging portion 35d. Therefore, the sliding member 34 can be easily attached to the carriage 33.

  As shown in FIG. 4, when the sliding member 34 is elastically deformed, the contact portion 34b of the sliding member 34 is urged toward the first holding surface 35a and the second holding surface 35b. At this time, a larger urging force acts toward the end of the sliding member 34 in the longitudinal direction. However, in the present embodiment, it is possible to apply a drag force in a direction opposite to the above urging force to the projecting portion 34d by a surface provided along the vertical direction of the engaging portion 35d of the carriage 33. Thereby, it becomes possible to make each contact part 34b, and the 1st holding surface 35a and the 2nd holding surface 35b contact uniformly.

  Further, as shown in FIG. 4, when the sliding member 34 is elastically deformed, the longitudinal ends of the sliding member 34 are opened along the first holding surface 35a and the second holding surface 35b. An urging force is applied to move to the side. However, in the present embodiment, the surface provided to intersect the first holding surface 35a of the engaging portion 35d substantially perpendicularly and the surface provided to intersect the second holding surface 35b of the engaging portion 35d substantially perpendicularly. With the formed surface, it is possible to prevent the end portion in the longitudinal direction of the sliding member 34 from moving to the opening end side of the recess 35 along the first holding surface 35a and the second holding surface 35b. Thereby, it is possible to prevent the sliding member 34 from dropping from the recess 35.

  Further, when the protrusion 34 d is engaged with the engaging portion 35 d, the portion protruding in the direction intersecting the guide rail 45 of the protrusion 34 d can be brought into contact with the front surface of the carriage 33. Accordingly, the sliding member 34 can be positioned with respect to the carriage 33 in a direction substantially parallel to the guide rail 45.

  The sliding member 34 is disposed on the front side in the moving direction of the carriage 33 when reading a document. Therefore, even when a force toward the guide rail 45 acts on a portion on the front side in the movement direction of the carriage 33 when the carriage 33 moves, the sliding member 34 causes the front side in the movement direction of the carriage 33 to move. The frictional resistance between the portion and the guide rail 45 can be reduced. Therefore, vibration of the carriage 33 and the like can be prevented, and a decrease in the feeding accuracy of the carriage 33 can be prevented.

  Further, the peripheral edge portion of the contact surface 34c of the sliding member 34 is chamfered. Therefore, the corner of the contact portion 34 b of the sliding member 34 is prevented from being pressed against the guide rail 45 when the carriage 33 moves. Thus, the sliding member 34 is prevented from being caught on the guide rail 45 when the carriage 33 is moved, and vibration of the carriage 33 can be prevented.

  The concave portion 35 of the carriage 33 has a first holding surface 35a and a second holding surface 35b formed in a substantially V shape. Therefore, the first holding surface 35a and the second holding surface are formed in a state where the elastic portion 34b of the sliding member 34 is elastically deformed and the contact portion 34b is urged against the first holding surface 35a and the second holding surface 35b. 35b. Then, due to the frictional resistance between the first holding surface 35a and the second holding surface 35b and the contact portion 34b, the sliding member 34 is attached to the concave portion 35 of the carriage 33 with no looseness and in a stable state with high accuracy. be able to.

Next, a transport reading mode in which the document is transported by the transport unit 5 and the document is read while the reading unit 3 is stationary will be described.
As shown in FIG. 3, the control unit 7 drives the drive unit 4 by transmitting a control signal C <b> 4 to the drive unit 4 in the conveyance reading mode. Then, the reading unit 3 is moved from an initial position between the first opening 11 and the second opening 12 to a reading position below the first opening 11. Next, the control unit 7 drives the transport unit 5 by transmitting a control signal C5 as shown in FIG. 3 while the reading unit 3 is stationary. Then, a document placed on a document tray (not shown) of the cover unit 2 shown in FIG.

  The document transported by the transport unit 5 moves relative to the reading unit 3 in a stationary state while being in sliding contact with the translucent sheet 14 disposed in the first opening 11. At this time, as shown in FIG. 4, the control unit 7 transmits a control signal C <b> 3 to the reading unit 3 to emit light from the light source, and receives an output signal D <b> 3 of the image sensor from the reading unit 3. In this way, the original is read by detecting the R, G, and B light emitted from the light source of the reading unit 3 and reflected by the original through the translucent sheet 14.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the elastic part may be formed not only by making the thickness thinner than the contact part, but also by making the width narrower than the contact part. Further, the protrusion is not limited to the shape described in the above embodiment.

33 Carriage (slide part), 34 Sliding member, 34a Elastic part, 34b Abutting part, 34d Projection part, 35 Recessed part, 35a First holding surface, 35b Second holding surface, 35d Engaging part, 45 Guide rail, SCN Reader

Claims (4)

An image sensor that detects light reflected by the reading target, a carriage that holds the image sensor, a guide rail that supports the carriage so as to be slidable in one direction, and a guide rail that is fixed to the carriage and contacts the guide rail. A sliding device in contact with the reading member,
The carriage has a recess for holding the sliding member;
The reading device according to claim 1, wherein the sliding member is engaged with the recess in an elastically deformed state, and is disposed on the front side in the moving direction of the carriage when the reading target is read . The sliding member has an elastic portion provided so as to be elastically deformable, and a contact portion that contacts the guide rail,
The reading device according to claim 1, wherein an area of a cross section of the elastic portion along the guide rail is smaller than an area of a cross section of the contact portion along the guide rail. The sliding member has a projecting portion projecting in a direction along the guide rail and in a direction intersecting the guide rail,
The reading apparatus according to claim 1, wherein the carriage has an engaging portion with which the protrusion is engaged. 4. The reading according to claim 1 , wherein the concave portion has a first holding surface and a second holding surface provided so as to intersect with each other along the guide rail. 5. apparatus.

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