JP2006072141A - Scanner and printer with scanner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost scanner, and a printer with the scanner. <P>SOLUTION: The printer with a scanner is equipped with a scanner main part base, a bracket 29, a first step gear 43 and a second step gear 45. a pulley 23, a belt 27, a motor 31, and a spring 37. The bracket 29 is slidably installed to the scanner main part base. The first step 43 and the second step gear 45 are arranged at the bracket 29. The pulley 23 is fixed to the scanner main part base apart spacing from the bracket 29. The belt 27 is spanned between the pulley 23 and the second step gear 45. The belt 27 is driven by accompanying the rotation of the first step 43 and the second step gear 45 and thereby, an image sensor is moved. The motor 31 rotates the first step gear 43 and the second step gear 45. The spring 37 energizes the bracket 29 in a direction where the bracket separates from the pulley 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scanner and a printer with a scanner, and more particularly to a scanner and a printer with a scanner that include a mechanism for moving an image reading apparatus.

2. Description of the Related Art Conventionally, an electronic apparatus including an image reading device including an image sensor or a light source for reading an image formed on a document or the like such as a scanner or a printer with a scanner is known. Such an image reading apparatus is disposed under a glass surface of a scanner or the like. Then, in order to read the image of the document placed on the glass surface, the image reading apparatus is moved so as to scan the entire glass surface. In order to move the image reading apparatus in this way, conventionally, gears, endless belts, and the like have been used to transmit driving force from a driving source such as a motor to the driving mechanism of the image reading apparatus (for example, Patent Documents 1 to 3). 3).
Japanese Patent Laid-Open No. 6-266021 JP 2001-295900 A JP 2004-85890 A

  As described above, when an endless belt is used to transmit driving force from a driving source, it is necessary to apply a predetermined tension to the endless belt in order to ensure accurate operation. In order to ensure such tension, conventionally, one pulley on which an endless belt is stretched is made movable, and a predetermined tension is generated by applying stress to the pulley using a spring or the like ( For example, refer to Patent Document 1) By applying a stress in a predetermined direction using a spring or the like to a base on which a pulley that transmits driving force between two endless belts is mounted, a predetermined stress in the endless belt is obtained. Has been proposed (see, for example, Patent Documents 2 and 3).

  However, in the conventional method described above, it is necessary to prepare a plurality of members for generating a predetermined tension in the endless belt, such as a base body and a spring for movably arranging the pulley, and a mechanism for transmitting a driving force The structure of (driving force transmission mechanism) was complicated. As a result, the manufacturing process of the driving force transmission mechanism becomes complicated and the cost of parts increases, which increases the manufacturing cost of a scanner or a printer with a scanner.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a low-cost scanner or a printer with a scanner.

  A printer with a scanner including a scanner unit and a printer unit according to the present invention includes a base member, a substrate, a gear, a pulley, a belt, a motor, a biasing member, and an insertion unit. The base member constitutes a scanner unit and has a recess. The substrate is installed on the base member so as to be rotatable about the rotation axis. An opening is formed in the substrate. The gear is disposed on the substrate. The pulley is installed on the base member at a distance from the substrate. The belt is bridged between the pulley and the gear. The belt moves the image sensor by being driven as the gear rotates. A motor is arrange | positioned inside a recessed part and rotates a gear. The biasing member biases the substrate in a direction away from the pulley. The insertion portion is inserted into the opening of the substrate and is fixed to the base member. The planar shape of the opening is an arc shape extending along the circumferential direction of a circle around the rotation axis.

  In this way, the substrate can be pressed in the direction away from the pulley about the rotation axis, so that tension can be generated in the belt spanned between the gear of the substrate and the pulley. In addition, since the belt on which the gears are originally arranged can be rotated to generate tension on the belt using a biasing member such as a spring, the pulley is arranged on a movable movable housing, By applying stress to the movable housing using an urging member, the number of parts can be reduced as compared with the case where tension is generated in the belt. For this reason, the manufacturing cost of the printer with a scanner can be reduced.

  The scanner according to the present invention includes a base member, a substrate, a gear, a pulley, a belt, a motor, and a biasing member. The substrate is movably installed on the base member. The gear is disposed on the substrate. The pulley is fixed to the base member at a distance from the substrate. The belt is bridged between the pulley and the gear. The belt is driven as the gear rotates to move the image sensor. The motor rotates the gear. The biasing member biases the substrate in a direction away from the pulley.

  In this way, the substrate is urged away from the pulley, so that tension can be generated in the belt spanned between the gear of the substrate and the pulley. In addition, since the belt on which the gears are originally arranged can be moved to generate tension on the belt using the biasing member, the pulley is disposed on the movable movable housing, and the biasing member such as a spring. The number of parts can be reduced as compared with the case where tension is applied to the belt by applying a stress to the movable housing. For this reason, the manufacturing cost of the scanner can be reduced.

  In the scanner, the substrate may be formed with an opening for restricting the rotational movement of the substrate. The scanner may include an insertion portion that is inserted into the opening of the substrate and is fixed to the base member.

  In this case, the range of the movement (that is, the rotational movement) of the substrate can be determined by changing the planar shape of the opening of the substrate. For this reason, the belt is excessively rotated in the direction away from the pulley and the belt is deformed or cut by applying unnecessary stress to the belt, or the substrate is excessively rotated in the direction of approaching the pulley and the belt is loosened. Therefore, the probability of occurrence of a problem such as the belt being detached from the pulley can be reduced.

  In the scanner, the substrate may be installed on the base member so as to be rotatable about the rotation axis. The planar shape of the opening may be an arc extending along the circumferential direction of a circle centered on the rotation axis. In this case, even when the insertion portion is inserted into the opening, the substrate can be smoothly rotated about the rotation axis.

  In the scanner, the motor may be fixed to the base member. In this case, it is possible to reduce the weight of the rotationally moving portion including the substrate on which the gears and the like are disposed, compared to the case where the motor is disposed on the substrate. For this reason, it is not necessary to use a member that generates a relatively strong stress as the urging member (a relatively weak stress that can rotate only the substrate on which a gear or the like is installed can be generated). Such a biasing member can be used).

  In the scanner, the base member may have a recess in which the motor is disposed, and the motor may be disposed in the recess of the base member. In this way, since the motor is not arranged on the substrate (on the surface of the substrate opposite to the surface facing the base member), it becomes possible to arrange other devices of the scanner in the region on the substrate. . For this reason, the freedom degree of the structure of a scanner can be enlarged.

  In the scanner, the motor may be fixed on the substrate. In this case, the structure around the substrate of the conventional scanner (the structure of the substrate on which the motor and the gear are arranged) such that the motor and the gear are arranged on the substrate and the substrate is fixed to the base member is used. The structure of the scanner according to the present invention can be realized. In this case, since the motor and the gear are both arranged on the substrate, the relative positional relationship between the motor and the gear can be fixed. For this reason, since the connection between the gear installed on the motor shaft of the motor and the gear arranged on the substrate can always be maintained, the driving force of the motor can be reliably transmitted to the gear.

  According to the present invention, the substrate itself (having the gears) that has existed in the past is movably disposed on the base member, and stress is applied to the substrate using the urging member, whereby the belt is predetermined. Tension can be generated. That is, since it is not necessary to use a separate member such as a moving housing for enabling the pulley to move, the number of parts can be reduced. As a result, a low-cost scanner or printer with a scanner can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic perspective view showing Embodiment 1 of a printer with a scanner according to the present invention. FIG. 2 is a schematic perspective view showing a state where the lid of the printer with a scanner shown in FIG. 1 is opened. FIG. 3 is a schematic perspective view showing the structure of the portion where the image sensor is mounted in the scanner main body of the printer with a scanner shown in FIGS. 1 and 2. FIG. 4 is a schematic diagram showing a drive mechanism for moving the image sensor shown in FIG. FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. FIG. 6 is a schematic cross-sectional view taken along line VI-VI in FIG. The scanner-equipped printer according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1 and FIG. 2, a printer with a scanner as a scanner according to the present invention includes a main body 1 and a lid 7 that can be opened and closed on the main body 1. The main unit 1 includes a printer main unit 5 as a printer unit and a scanner main unit 3 as a scanner unit installed on the printer main unit 5. A printing mechanism for printing a predetermined image on a sheet is disposed inside the printer body 5. Formed on the front surface of the printer main body 5 is a paper discharge port 6 through which paper on which an image is printed is discharged. A paper feed tray 9 and a guard member 11 are installed on the upper surface of the lid 7.

  A glass plate 4 is installed on the upper surface of the scanner body 3 as shown in FIG. On this glass plate 4, a reading object such as a sheet-like paper on which an image or characters are formed is mounted. An image sensor 15 for reading an image is installed under the glass plate 4. The image sensor 15 is movable in the direction indicated by the arrow 21.

  Next, a drive mechanism that moves the image sensor 15 will be described with reference to FIGS. As shown in FIG. 3, the image sensor 15 is installed inside a scanner body base 13 as a base member constituting the scanner body 3 (see FIG. 1). A pedestal member 18 is connected below the image sensor 15. The pedestal member 18 is in a state of being fitted with a guide rod 17 extending in a direction substantially perpendicular to the direction in which the image sensor 15 extends. The guide rod 17 is connected and fixed to the scanner body base 13. One end of the guide bar 17 is fixed by a fixing portion 19 of the scanner body base 13. In order to move the image sensor 15 in the direction indicated by the arrow 21 in a portion along the guide rod 17 (so as to extend in the same direction as the direction in which the guide rod 17 extends) in a portion adjacent to the guide rod 17. The belt 27 is arranged.

  The belt 27 has a loop shape. A part of the belt 27 is wound around a pulley 23 as a pulley fixed to an end of the scanner body base 13 in the recess 14. The pulley 23 is rotatable about the pulley shaft 25. The pulley shaft 25 is connected and fixed to the bottom wall of the scanner body base 13. The belt 27 is also wound around a second gear 45 (see FIG. 4) disposed on a bracket 29 as a substrate disposed at a distance from the pulley 23. That is, the belt 27 is stretched over the pulley 23 and the second-stage gear 45. The belt 27 moves the image sensor 15 by being driven as the second gear 45 rotates.

  The bracket 29 is connected to the scanner body base 13 by inserting and fixing the fixing screw 31 to the boss portion 58 (see FIG. 5) of the scanner body base 13 through the hole formed in the bracket 29. The bracket 29 is rotatable in the direction indicated by the arrow 47 in FIG. 4 around the fixing screw 31 as the rotation axis. The arrangement of the fixing screw 31 can be arbitrarily determined. For example, as shown in FIG. 4, the fixing screw 31 is positioned so as not to overlap the belt 27 when viewed from the direction in which the belt 27 extends (the pulley 23 and the second gear shaft 62 of the second gear 45 (see FIG. 6)). You may arrange | position in the position which does not overlap with the straight line to connect. In this case, the rotation axis of the bracket 29 is disposed at a position that does not overlap with the direction in which the belt 27 is stretched (in order to generate tension). Tension can be easily generated. Further, although the fixing screw 31 is used as the rotation axis of the bracket 29, other connection structures may be used as long as the bracket 29 can be connected to the scanner body base 13 in a rotatable manner.

  Next, the structure of the bracket 29 will be described in more detail with reference to FIGS. A first-stage gear 43 and a second-stage gear 45 as gears are attached to the resin bracket 29. The scanner body base 13 below the bracket 29 is formed with a recess 49 for arranging the motor 39. A motor 39 for rotating the first-stage gear 43 and the second-stage gear 45 is installed inside the recess 49. In this way, the weight of the portion that rotates about the fixing screw 31 (the weight of the portion including the bracket 29) can be made smaller than when the motor 39 is installed on the bracket 29. For this reason, it is not necessary to use a spring 37 that generates a relatively strong stress, and a relatively small spring can be used. Further, since the motor 39 is not disposed on the bracket 29 (on the surface of the bracket 29 opposite to the surface facing the scanner body base 13), other devices of the scanner body 3 are disposed in the region on the bracket 29. It becomes possible. For this reason, the freedom degree of the structure of the scanner main-body part 3 can be enlarged.

  A flange portion 51 (see FIG. 5) is formed on the outer edge portion of the upper portion of the motor 39. A hole (not shown) is formed in the flange portion 51. A screw is inserted so as to pass through the hole, and the motor 39 is fixed to the scanner main body base 13 by connecting and fixing the screw to the scanner main body base 13.

  A motor gear 41 is fixed to the tip of the motor shaft 40 of the motor 39. A large-diameter gear 55 constituting the first-stage gear 43 is disposed so as to come into contact with the motor gear 41. The first-stage gear 43 includes the above-described large-diameter gear 55 and a small-diameter gear 56 having a smaller diameter than the large-diameter gear 55. The centers of the large diameter gear 55 and the small diameter gear 56 are arranged so as to overlap and are fixed to each other. A first stage gear shaft 53 is disposed at the center. The first stage gear 43 is connected to the bracket 29 by the first stage gear shaft 53. The first stage gear 43 is rotatable about the first stage gear shaft 53.

  The bracket 29 is provided with a second-stage gear 45 so as to be in contact with the first-stage gear 43 (specifically, in contact with the small-diameter gear 56 of the first-stage gear 43). The second-stage gear 45 has a large-diameter gear 60 disposed so as to come into contact with the small-diameter gear 56 of the first-stage gear 43 and a smaller diameter than the large-diameter gear 60. It consists of a small-diameter gear 61 whose center is arranged at the same position. Each of the large diameter gear 60 and the small diameter gear 61 is connected to the bracket 29 by a second stage gear shaft 62. The large-diameter gear 60 and the small-diameter gear 61 are connected and fixed to each other, and can rotate around the second-stage gear shaft 62. Although not shown, the outer peripheral surfaces of the motor gear 41, the large diameter gears 55 and 60, and the small diameter gear 56 are formed with a plurality of teeth that mesh with each other. Further, the outer peripheral surface of the small-diameter gear 61 constituting the second gear 45 is not gear-shaped but has a groove-like structure so that the belt 27 can be wound thereon. As a result, the driving force generated by the motor 39 is transmitted from the motor shaft 40 and the motor gear 41 to the belt 27 through the first gear 43 and the second gear 45.

  Here, as described above, the bracket 29 can move (rotate) in the direction indicated by the arrow 47 in FIG. 4 around the position where the fixing screw 31 is disposed. Further, the bracket 29 is formed with an opening 35 for restricting the movement range of the rotational movement of the bracket 29. The opening 35 has an arcuate planar shape extending along the circumferential direction of a circle centered on the fixing screw 31. A guide screw 33 as an insertion portion that is fixed by reaching the scanner main body base 13 from the upper surface of the bracket 29 through the opening 35 is disposed. In this way, even when the guide screw 33 as the insertion portion is inserted into the opening 35, the bracket 29 can be smoothly rotated about the fixing screw 31. If the range of rotational movement of the bracket 29 can be regulated by being inserted into the opening 35, the structure other than the guide screw 33, for example, the surface of the scanner body base 13 is inserted into the opening 35. You may use the structure of the formed convex part.

  In this way, the range of movement (that is, rotational movement) of the bracket 29 can be determined by changing the planar shape of the opening 35 of the bracket 29 as a substrate. For this reason, the bracket 29 is excessively rotated in a direction away from the pulley 23 as a pulley and an excessive stress is applied to the belt 27, whereby the belt 27 is deformed or cut, or the bracket 29 is moved to the pulley 23 side. It is possible to reduce the probability of occurrence of a problem that the belt 27 is detached from the pulley 23 because the belt 27 loosens due to excessive rotational movement in the approaching direction.

  Further, a spring 37 as an urging member for applying a stress in the direction indicated by the arrow 48 to the bracket 29 is disposed at a position adjacent to the opening 35. One end of the spring 37 is a fixed portion 38 a connected to the bracket 29, and the other end is a fixed portion 38 b connected to the scanner body base 13. With such a configuration, it is possible to apply stress to the bracket 29 so that the bracket 29 is moved in the direction indicated by the arrow 48 around the position of the fixing screw 31 by the elastic force of the spring 37. For this reason, a predetermined tension can be applied to the belt 27. Instead of the spring 37, any elastic body other than the helical spring such as the spring 37 may be used as long as stress can be applied to the bracket 29 in the direction indicated by the arrow 48.

  Here, the effect of the printer with a scanner according to the present invention will be described in comparison with the configuration of the drive unit of the conventional image sensor. FIG. 10 is a schematic diagram showing a structure of a drive unit of an image sensor in a conventional printer with a scanner as a comparative example. 11 is a schematic cross-sectional view taken along line XI-XI in FIG. With reference to FIG. 10 and FIG. 11, the drive part of the image sensor as a comparative example is demonstrated. 10 and 11 correspond to FIGS. 4 and 5, respectively.

  The driving unit of the image sensor as a comparative example shown in FIGS. 10 and 11 basically has the same structure as the driving unit of the image sensor according to the present invention shown in FIGS. The pulley 23 is installed in an idler housing 65 movable relative to the scanner body base 13, and is fixed to the scanner body base 13 by a fixing screw 63. The point which receives the stress in the direction shown in 71 is greatly different. One end of the spring 67 is in contact with the idler housing 65, and the other is in contact with a fixed portion 69 formed on the scanner body base 13. With such a configuration, tension is generated in the belt 27 by the elastic force of the spring 67. As can be seen from FIG. 11, in the image ship driving unit as a comparative example, a motor 39 is disposed on the upper surface of the bracket 29, and the flange portion 51 of the motor 39 is connected and fixed to the bracket 29 by a screw 52. This is also different from the drive unit according to the present invention shown in FIGS.

  Thus, conventionally, the pulley 23 is disposed on the idler housing 65 movable with respect to the scanner main body base 13, and the idler housing 65 is urged in the direction indicated by the arrow 71 by using the spring 67, whereby the belt 27, tension was generated. However, in such a drive mechanism as a comparative example, a member such as the idler housing 65 is necessary to generate tension in the belt 27. On the other hand, in the drive mechanism shown in FIGS. 4 and 5 according to the present invention, the above-described idler housing 65 (see FIG. 10) is not necessary, and the bracket 29 itself can be rotated around the fixing screw 31. Thus, tension can be generated in the belt 27 by a relatively simple configuration in which the spring 37 is disposed. For this reason, since the number of parts can be made smaller than in the comparative example, the manufacturing cost of the printer with a scanner can be reduced.

(Embodiment 2)
FIG. 7 is a schematic diagram for explaining a portion where an image sensor is installed in Embodiment 2 of the printer with a scanner according to the present invention. FIG. 8 is a schematic diagram for explaining a drive mechanism of the image sensor in the printer with a scanner shown in FIG. FIG. 9 is a schematic cross-sectional view taken along line IX-IX in FIG. 7 to 9 correspond to FIGS. 3 to 5, respectively. A second embodiment of the printer with a scanner according to the present invention will be described with reference to FIGS.

  The printer with a scanner shown in FIGS. 7 to 9 basically has the same structure as that of the first embodiment of the printer with a scanner according to the present invention, but the structure of a drive unit for driving the image sensor 15 is different. . That is, in Embodiment 2 of the printer with a scanner according to the present invention, the motor 39 is disposed on the upper surface of the bracket 29 that constitutes the drive unit of the image sensor 15. In the motor 39, a flange portion 51 formed on the outer peripheral portion of the lower end thereof is connected and fixed to the bracket 29 by a screw 52. The motor shaft 40 of the motor 39 is disposed so as to protrude to the lower surface side of the bracket 29 through a hole formed in the bracket 29. A motor gear 41 is disposed at the tip of the motor shaft 40. The motor gear 41 is in contact with the large diameter gear 55 of the first stage gear 43. The structure of the first gear 43 and the second gear 45 is the same as the structure of the first gear 43 and the second gear 45 shown in FIGS. Even with such a structure, the driving force of the motor 39 can be transmitted to the belt 27 via the first gear 43 and the second gear 45. Since the spring 37 can apply stress so that the bracket 29 rotates about the fixing screw 31 in the direction indicated by the arrow 48, a predetermined tension can be generated in the belt 27.

  In this way, the same effect as in the first embodiment of the printer with a scanner according to the present invention can be obtained. Furthermore, since the motor 39 is disposed on the upper surface of the bracket 29, it is not necessary to form a recess for housing the motor 39 on the scanner body base 13 side. Therefore, the structure of the scanner main body base 13 can be further simplified. Also, the structure around the bracket 29 of the printer with a scanner of the comparative example as shown in FIGS. 10 and 11 (structure of the bracket 29 in which the motor 39, the first stage gear 43 and the second stage gear 45 are arranged) is diverted. Thus, the structure of the printer with a scanner according to the present invention can be realized. Further, since the motor 39 and the first-stage gear 43 and the second-stage gear 45 are arranged on the bracket 29, the relative positional relationship between the motor 39 and the first-stage gear 43 and the second-stage gear 45 is provided. Can be fixed. For this reason, since the connection between the motor gear 41 installed on the motor shaft 40 of the motor 39 and the first-stage gear 43 disposed on the bracket 29 can be maintained at all times, the driving force of the motor 39 is reliably supplied to the first-stage gear 43. Can be communicated to. Note that the driving mechanism of the image sensor 15 according to the present invention described above can be applied not only to a printer with a scanner as shown in FIG. 1 but also to a scanner and other electric devices using an image sensor.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above-described embodiment but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 is a schematic perspective view showing Embodiment 1 of a printer with a scanner according to the present invention. FIG. 2 is a schematic perspective view illustrating a state in which a lid of the printer with a scanner illustrated in FIG. 1 is opened. FIG. 3 is a schematic perspective view illustrating a structure of a portion in which an image sensor is mounted in the scanner main body of the printer with a scanner illustrated in FIGS. 1 and 2. It is a schematic diagram which shows the drive mechanism for moving the image sensor shown in FIG. It is a cross-sectional schematic diagram in line segment VV of FIG. It is a cross-sectional schematic diagram in line segment VI-VI of FIG. It is a schematic diagram for demonstrating the part in which the image sensor was installed in Embodiment 2 of the printer with a scanner by this invention. It is a schematic diagram for demonstrating the drive mechanism of the image sensor in the printer with a scanner shown in FIG. It is a cross-sectional schematic diagram in line segment IX-IX of FIG. It is a schematic diagram which shows the structure of the drive part of the image sensor in the conventional printer with a scanner as a comparative example. It is a cross-sectional schematic diagram in line segment XI-XI of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Main body part, 3 Scanner main body part, 4 Glass plate, 5 Printer main body part, 6 Paper discharge port, 7 Lid, 9 Paper feed tray, 11 Guard member, 13 Scanner main body base, 14 Recessed part, 15 Image sensor, 17 Guide rod , 18 base member, 19, 69 fixing part, 21 arrow, 23 pulley, 25 pulley shaft, 27 belt, 29 bracket, 31 fixing screw, 33 guide screw, 35 opening, 37, 67 spring, 38a, 38b fixing part, 39 Motor, 40 Motor shaft, 41 Motor gear, 43 First gear, 45 Second gear, 47, 48, 71 Arrow, 49 Recess, 51 Flange, 52 Screw, 53 First gear, 55, 60 Large Diameter gear, 56, 61 Small diameter gear, 58 Boss, 60 Large diameter gear, 62 Second gear shaft, 63 Fixing screw, 65 Id Lahousing.

Claims (7)

A printer with a scanner including a scanner unit and a printer unit,
A base member that forms a scanner part and has a recess;
The base member is installed so as to be rotatable around a rotation axis, and a substrate having an opening formed therein,
A gear disposed on the substrate;
A pulley installed on the base member at a distance from the substrate;
A belt that moves across the pulley and the gear and moves the image sensor by being driven along with the rotation of the gear;
A motor that is disposed inside the recess and rotates the gear;
A biasing member that biases the substrate in a direction away from the pulley;
An insertion portion that is inserted into the opening of the substrate and fixed to the base member;
The printer with a scanner, wherein the planar shape of the opening is an arc shape extending along a circumferential direction of a circle around the rotation axis. A base member;
A substrate movably installed on the base member;
A gear disposed on the substrate;
A pulley installed on the base member at a distance from the substrate;
A belt that moves across the pulley and the gear and moves the image sensor by being driven along with the rotation of the gear;
A motor for rotating the gear;
And a biasing member that biases the substrate in a direction away from the pulley. The substrate is formed with an opening for restricting the rotational movement of the substrate,
The scanner according to claim 2, further comprising an insertion portion that is inserted into the opening of the substrate and is fixed to the base member. The substrate is installed on the base member so as to be rotatable about a rotation axis,
4. The scanner according to claim 3, wherein the planar shape of the opening is an arc shape extending along a circumferential direction of a circle around the rotation axis.   The scanner according to claim 2, wherein the motor is fixed to the base member. The base member is formed with a recess in which the motor is disposed,
The scanner according to claim 5, wherein the motor is disposed inside the concave portion of the base member.   The scanner according to claim 2, wherein the motor is fixed on the substrate.

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