JP2014099828A - Image reading apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading apparatus capable of downsizing a translucent member.SOLUTION: A first portion 131 of a spacer 102 and a first portion 141 of a spacer 103 are interposed between a contact image sensor module 64 and a contact glass 63. A second portion 132 of the spacer 102 and a second portion 142 of the spacer 103 are interposed between the contact glass 63 and an engaging wall 112. Accordingly, in comparison to a constitution in which the contact glass 63 extends to the engaging wall 112, the horizontal size of the contact glass 63 can be reduced.

Description

  The present invention relates to an image reading apparatus.

  The image reading apparatus disclosed in Patent Document 1 includes a contact glass and an image reading unit. The conveyance path through which the sheet is conveyed passes through the contact glass. The image reading unit is disposed on the side opposite to the conveyance path side with respect to the contact glass. When the sheet passes over the contact glass, light is irradiated from the image reading unit to the sheet on the contact glass. And the image of a sheet | seat is read by the reflected light in a sheet | seat being received by the image sensor of an image reading part.

  The housing of the image reading apparatus includes a wall portion that extends in a direction orthogonal to the conveyance direction at a position spaced apart from the image reading unit in the conveyance direction. The contact glass is provided on the wall portion of the contact glass.

JP 2010-219952 A

  For this reason, there is a problem that the size of the contact glass, particularly the size in the transport direction, is large.

  An object of the present invention is to provide an image reading apparatus capable of reducing the size of a translucent member.

  In order to achieve the above object, an image reading apparatus according to an aspect of the present invention includes a housing, a transport unit that is provided in the housing and configured to transport a sheet in a first direction, A reading unit provided in a housing and extending in a second direction orthogonal to the first direction and configured to read an image of a sheet conveyed by the conveying unit; and the first direction with respect to the reading unit And a translucent member located on one side of a third direction orthogonal to the second direction, a first portion interposed between the reading unit and the translucent member, and the first portion to the first And a spacer having a second portion extending to one side of the direction.

  According to this configuration, the first portion of the spacer is interposed between the reading unit and the translucent member. Thereby, the interval between the reading unit and the translucent member is adjusted to a certain distance, that is, the thickness of the first portion. Therefore, the distance between the sheet disposed on the translucent member and the reading unit can be a constant distance. As a result, the image on the sheet can be satisfactorily read by the reading unit.

  The second portion extends from the first portion of the spacer to one side in the first direction. Therefore, the second portion can be interposed between the translucent member and the wall portion that is separated from the reading unit in the housing to one side in the first direction. Therefore, the size of the translucent member in the first direction can be reduced as compared with the configuration in which the translucent member extends to the wall portion of the housing.

  The spacer may protrude from the second portion to one side in the third direction, and may have a protruding portion in which the protruding amount on the other side in the first direction is larger than the protruding amount on the one side in the first direction.

  According to this configuration, when the sheet is conveyed from one side to the other side in the first direction, the sheet can be rubbed against the protruding portion. Since the protrusion amount on the other side in the first direction of the protrusion is larger than the protrusion amount on the one side in the first direction, the protrusion can smoothly guide the sheet onto the translucent member.

  The spacer may have an engaging portion configured to extend from the second portion to the other side in the third direction, a tip portion thereof extending to one side in the first direction, and engage with the housing. .

  According to this structure, it can suppress that a spacer floats from a housing | casing because an engaging part engages with a housing | casing. As a result, the movement of the reading unit can be suppressed by the first portion of the spacer.

  The reading unit includes a main body that extends in the second direction, and a positioning unit that protrudes from the main body to one side in the first direction and is configured to position the reading unit on the housing. The part may be covered from one side in the third direction.

  According to this structure, it can suppress that a positioning part moves to the one side of a 3rd direction by the 2nd part of a spacer. As a result, the movement of the reading unit can be suppressed.

  According to this invention, size reduction of a translucent member can be achieved.

FIG. 1 is a perspective view of the image reading apparatus 1 according to an embodiment of the present invention as viewed from the upper left front, and shows a state where the tray 3 is located at the tray position. FIG. 2 is a cross-sectional view of the image reading apparatus 1 shown in FIG. FIG. 3 is a perspective view of the image reading apparatus 1 as viewed from the upper left front, and shows a state where the discharge cover 5 is located at the tray position. 4 is a cross-sectional view of the image reading apparatus 1 shown in FIG. FIG. 5 is a perspective view of the upper reading unit 30 as viewed from the lower right front. FIG. 6 is a perspective view of the upper reading unit 30 as viewed from the lower right rear side. FIG. 7 is a plan view of the upper reading unit 30 as viewed from below. FIG. 8 is a cross-sectional view of the upper reading unit 30 taken along the cutting line AA shown in FIG. FIG. 9 is a cross-sectional view of the upper reading unit 30 taken along the cutting line BB shown in FIG. FIG. 10 is a perspective view of the front spacer 102 as viewed from the lower right rear. FIG. 11 is a perspective view of the rear spacer 103 viewed from the lower right front. FIG. 12 is an explanatory diagram for explaining the arrangement of the contact glass 63, the contact image sensor module 64, and the spacers 102 and 103.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Appearance configuration>

  As shown in FIGS. 1 and 3, the image reading apparatus 1 includes a housing 2, a tray 3, a maintenance cover 4 and a discharge cover 5. The tray 3, the maintenance cover 4 and the discharge cover 5 are attached to the housing 2.

  It is to be noted that the direction in which the tray 3 and the maintenance cover 4 are provided is defined as the upper side, and the side in which the discharge cover 5 is provided is defined as the left side. And in each figure after FIG. 1, a direction is displayed with an arrow.

  The housing 2 is coupled from above to a housing of a printer (not shown). The housing 2 includes a front side plate 6, a rear side plate 7, a left side plate 8 and a right side plate 9. The front side plate 6 and the rear side plate 7 are arranged at an interval in the front-rear direction. The left side plate 8 is constructed between the left end portions of the front side plate 6 and the rear side plate 7. The left side plate 8 is divided into a front left side plate 10 and a rear left side plate 11. The front left side plate 10 and the rear left side plate 11 are separated from each other in the front-rear direction. The right side plate 9 is installed between the right end portions of the front side plate 6 and the rear side plate 7.

  The tray 3 is disposed between the central portions of the front side plate 6 and the rear side plate 7. The tray 3 is provided between a cover position and a tray position shown in FIG. 1 or the like so as to be rotatable around a rotation axis extending in the front-rear direction along the right edge. The tray 3 extends along the upper surface 12 of the housing 2 at the cover position. The tray 3 extends upward from the housing 2 at the tray position.

  The maintenance cover 4 is disposed between the front side plate 6 and the rear side plate 7. The maintenance cover 4 is provided between a closed position and an open position so as to be rotatable around a rotation axis extending in the front-rear direction along the right end edge thereof. The maintenance cover 4 extends along the upper surface 12 of the housing 2 in the closed position. The maintenance cover 4 extends upward from the housing 2 in the open position.

  The discharge cover 5 is disposed between the front left side plate 10 and the rear left side plate 11. The discharge cover 5 is provided between a cover position and a tray position so as to be rotatable about a rotation shaft 13 extending in the front-rear direction along the lower edge thereof. As shown in FIGS. 1 and 2, the discharge cover 5 extends in the vertical direction at the cover position. In a state where the discharge cover 5 is located at the cover position, the outer surface of the discharge cover 5 is disposed on substantially the same plane as the outer surfaces of the front left side plate 10 and the rear left side plate 11. As shown in FIGS. 3 and 4, the discharge cover 5 extends upward from the housing 2 at the tray position.

<Internal configuration>

  2 and 4, the image reading apparatus 1 includes a supply unit 21, a pair of sheet width guides 22, a supply roller 23, a separation roller 24, a separation piece 25, a common path forming unit 26, and a conveyance unit. As an example, three first LF rollers 27 as an example, three driven rollers 28 as an example of a conveyance unit, a lower reading unit 29, an upper reading unit 30, three second LF rollers 31 as an example of a conveyance unit, and an example of a conveyance unit 3 driven rollers 32, a driven roller 33 as an example of a conveying unit, a first path forming unit 35, three driven rollers 36 as an example of a conveying unit, a discharge unit 37, and a second path forming unit 38.

  The supply unit 21 is provided at the center in the left-right direction of the housing 2. The sheet S that is the target of image reading is placed on the upper surface 41 of the supply unit 21.

  The pair of sheet width guides 22 is provided in the supply unit 21. The pair of sheet width guides 22 face each other in the front-rear direction. The pair of sheet width guides 22 are configured to be able to approach and separate with the same amount of movement with respect to the center between them. The distance between the pair of sheet width guides 22 is adjusted according to the width in the front-rear direction of the sheet S placed on the upper surface 41 of the supply unit 21. The sheet S is inserted between the pair of sheet width guides 22 from the right side. Accordingly, the sheet S is placed on the upper surface 41 of the supply unit 21 with a center reference.

  The supply roller 23 is disposed on the left side of the supply unit 21 and in the central part in the front-rear direction. The supply roller 23 is provided in the housing 2 so as to be rotatable around a rotation axis extending in the front-rear direction.

  The separation roller 24 is disposed on the left side of the supply roller 23 and at the center in the front-rear direction. The separation roller 24 is provided in the housing 2 so as to be rotatable around a rotation axis extending in the front-rear direction.

  The separation piece 25 is disposed on the upper side of the separation roller 24. The separation piece 25 is in elastic contact with the peripheral surface of the separation roller 24 from above.

  The common path forming unit 26 is provided in the housing 2 on the left side of the separation roller 24 and below the maintenance cover 4. The common path forming unit 26 includes an upper side forming unit 51 and a lower side forming unit 52. The lower surface 53 of the upper forming portion 51 is inclined downward to the left. The upper surface 54 of the lower forming portion 52 extends substantially in parallel with the lower surface 53 of the upper forming portion 51 with a space therebetween. A space between the lower surface 53 of the upper forming portion 51 and the upper surface 54 of the lower forming portion 52 is a common path 55 through which the sheet S passes.

  The three first LF rollers 27 are attached to a rotating shaft 56 extending in the front-rear direction at equal intervals in the front-rear direction. The rotation shaft 56 is disposed above the upper surface 54 of the upper forming portion 51 at the center in the left-right direction of the upper forming portion 51. The rotating shaft 56 is rotatably held by the housing 2. A part of the peripheral surface of each first LF roller 27 protrudes into the common path 55.

  The three driven rollers 28 are provided at equal intervals in the front-rear direction. Each driven roller 28 is rotatably supported by a spring shaft 57 extending in the front-rear direction. The spring shaft 57 is disposed below the upper surface 54 of the lower forming portion 52 at the center in the left-right direction of the lower forming portion 52. The spring shaft 57 is held by the housing 2. A part of the peripheral surface of each driven roller 28 protrudes into the common path 55. A part of the peripheral surface of each driven roller 28 is in contact with the peripheral surface of the first LF roller 27 from the lower right in the common path 55. Each driven roller 28 rotates following the rotation of the first LF roller 27.

  As shown in FIGS. 2 and 4, the lower reading unit 29 includes a contact glass 61 and a contact image sensor module 62.

  The contact glass 61 is held by the housing 2 below the supply unit 21, the supply roller 23, the separation roller 24, and the driven roller 28. The contact glass 61 extends in the left-right direction and the front-rear direction substantially parallel to the upper surface 12 of the housing 2. The left end portion of the contact glass 61 is located on the left side of the common path forming portion 26. The common path 55 extends to the left via the upper side of the contact glass 61 from between the lower surface 53 of the upper forming portion 51 and the upper surface 54 of the lower forming portion 52.

  The contact image sensor module 62 is provided below the contact glass 61 so as to be movable in the left-right direction. For example, an LED light source, a lens, and an image sensor are provided inside the contact image sensor module 62. The contact image sensor module 62 is disposed below the left end portion of the contact glass 61 when ADF is read and when the image reading apparatus 1 is not used.

  The upper reading unit 30 includes a contact glass 63 as an example of a translucent member and a contact image sensor module 64 as an example of a reading unit.

  The contact glass 63 is held by the housing 2 at a position on the left side of the contact glass 61 and above the contact glass 61. The contact glass 63 extends in the front-rear direction. The common path 55 extends to the left via the lower side of the contact glass 63.

  The contact image sensor module 64 is disposed below the contact glass 63. In the contact image sensor module 64, for example, an LED light source, a lens, an image sensor, and the like are provided.

  The three second LF rollers 31 are provided on the left side of the upper reading unit 30. The three second LF rollers 31 are attached to the rotary shaft 65 extending in the front-rear direction at equal intervals. The rotating shaft 65 is rotatably held by the housing 2.

  The three driven rollers 32 are disposed below the second LF roller 31. The three driven rollers 32 are attached to a rotating shaft 66 extending in the front-rear direction at equal intervals. The rotating shaft 66 is rotatably held by the housing 2. A part of the peripheral surface of each driven roller 32 is in contact with the peripheral surface of the second LF roller 31. The driven roller 32 rotates following the rotation of the second LF roller 31.

  The driven roller 33 is disposed below the center second LF roller 31 and on the left side of the driven roller 32. A rotation shaft 67 extending in the front-rear direction is inserted through the driven roller 33. The rotating shaft 67 is held by the housing 2. A part of the peripheral surface of the driven roller 33 is in contact with the center second LF roller 31. The driven roller 33 rotates following the rotation of the second LF roller 31. The common path 55 extends from a contact position between the separation roller 24 and the separation piece 25 to a contact position between the second LF roller 31 and the driven roller 33.

  The first path forming unit 35 includes an upper forming unit 71 and a lower forming unit 72. The upper forming portion 71 is provided on the inner surface of the maintenance cover 4. The lower surface of the left end portion 73 of the upper forming portion 71 is curved along the peripheral surface of the second LF roller 31 from a position spaced on the left side of the second LF roller 31. The lower surface of the right end portion 74 of the upper forming portion 71 extends in the front-rear direction and the left-right direction substantially parallel to the upper surface 12 of the housing 2. The lower forming portion 72 extends in the front-rear direction and the left-right direction with a space below the right end portion 74 of the upper forming portion 71. A space between the second LF roller 31 and the upper forming portion 71 and a space between the upper forming portion 71 and the lower forming portion 72 are a first pass 75 through which the sheet S passes.

  The three driven rollers 36 are disposed on the upper side of the second LF roller 31. The three driven rollers 36 are attached to a rotating shaft 76 extending in the front-rear direction at equal intervals. The rotating shaft 76 is rotatably held by the maintenance cover 4. A part of the peripheral surface of each driven roller 36 is in contact with the peripheral surface of the second LF roller 31 in the first pass 75. The driven roller 32 rotates following the rotation of the second LF roller 31.

  The discharge part 37 is provided on the right side of the lower forming part 72 with an interval above the supply part 21. The upper surface 77 of the discharge part 37 is formed in a substantially flat surface extending in the front-rear direction and the left-right direction.

  The second path forming unit 38 is provided in the housing 2 on the left side of the driven roller 33. The second path forming portion 38 extends slightly to the left from the position spaced on the left side of the driven roller 33, bends upward to the left, and extends to the position spaced on the right side of the lower end portion of the discharge cover 5. Yes. The space above the second path forming unit 38 is a second path 78 through which the sheet S passes.

  In addition, the image reading apparatus 1 includes a flapper 81 and a link mechanism 82.

  The flapper 81 is disposed below the left end portion of the upper forming portion 71 of the first path forming portion 35. The flapper 81 is provided on the housing 2 so as to be able to swing between the state shown in FIG. 2 and the state shown in FIG. The flapper 81 in the state shown in FIG. 2 extends along the first path 75. The flapper 81 in the state shown in FIG. 2 allows the sheet S to enter the first path 75. The flapper 81 in the state shown in FIG. 4 extends along the second path 78. The flapper 81 in the posture shown in FIG. 4 allows the sheet S to enter the second path 78.

  The link mechanism 82 displaces the flapper 81 between the state shown in FIG. 2 and the state shown in FIG. 4 in conjunction with the displacement of the discharge cover 5. Specifically, when the discharge cover 5 is displaced from the cover position to the tray position, the flap mechanism 81 moves from the state shown in FIG. 2 to the state shown in FIG. Further, when the discharge cover 5 is displaced from the tray position to the cover position, the flap mechanism 81 moves from the state shown in FIG. 4 to the state shown in FIG.

  The image reading apparatus 1 includes a first receiving member 91 and a second receiving member 93.

  The first receiving member 91 is provided on the discharge cover 5 with a space from the inner surface 94 of the discharge cover 5. Thereby, a space 95 in which the second receiving member 93 can be accommodated is formed between the first receiving member 91 and the inner surface 94 of the discharge cover 5.

  The second receiving member 93 is rotatably provided at a storage position stored in the space 95 and a deployed position extending from the space 95. As shown in FIG. 3, the second receiving member 93 extends from the space 95 along the inner surface 94 of the discharge cover 5 in the deployed position. The second receiving member 93 includes an extending part 97 and a protruding part 98. The protruding portion 98 is formed at the left end portion of the extending portion 97 in a state where the second receiving member 93 is located at the deployed position. The protruding portion 98 protrudes from the extending portion 97 to the same side as the protruding portion 92.

<Image reading operation 1>

  When the image reading target sheet S in the image reading apparatus 1 is a relatively weak sheet such as a copy sheet, the discharge cover 5 is closed as shown in FIGS. 1 and 2. As described above, the sheet S is placed on the supply unit 21 and the tray 3 on the basis of the center.

  The leading end of the sheet S is disposed on the peripheral surface of the supply roller 23. When the supply roller 23 is rotated counterclockwise as viewed from the front side, the sheet S is separated by the frictional force between the lower surface of the lowermost sheet S on the supply unit 21 and the peripheral surface of the supply roller 23. And the separation piece 25.

  The separation roller 24 is rotated counterclockwise when viewed from the front side. When the leading end of the sheet S is sandwiched between the separation roller 24 and the separation piece 25, the sheet S is separated, for example, one by one, and one sheet S is between the separation roller 24 and the separation piece 25. And is sent to the common path 55.

  The first LF roller 27 is rotated clockwise as viewed from the front side. The driven roller 28 rotates counterclockwise as viewed from the front side as the first LF roller 27 rotates. When the leading edge of the sheet S sent to the common path 55 reaches the contact portions of the peripheral surfaces of the first LF roller 27 and the driven roller 28, a conveying force is applied to the sheet S from the first LF roller 27 and the driven roller 28. The When the size of the sheet S in the front-rear direction is equal to or greater than the distance between the driven rollers 28 on both sides in the front-rear direction, a conveying force is applied to the sheet S from the three sets of the first LF roller 27 and the driven roller 28.

  Thereafter, the sheet S sequentially passes over the contact glass 61 and the contact glass 63. The sheet S on the contact glass 61 and the contact glass 63 is irradiated with light from the LED light sources of the contact image sensor modules 62 and 64, respectively. Then, the reflected light on the sheet S is received by the image sensors of the contact image sensor modules 62 and 64, whereby the images drawn on both surfaces of the sheet S are read.

  The second LF roller 31 is rotated clockwise as viewed from the front side. The driven rollers 32 and 33 rotate counterclockwise when viewed from the front side. When the leading edge of the sheet S reaches the contact portions of the peripheral surfaces of the second LF roller 31 and the driven roller 32, a conveying force is applied to the sheet S from the second LF roller 31 and the driven roller 32. Thereafter, when the leading edge of the sheet S reaches the contact portions of the peripheral surfaces of the second LF roller 31 and the driven roller 33, a conveying force is applied to the sheet S from the second LF roller 31 and the driven roller 33.

  Since the discharge cover 5 is closed, the flapper 81 is located in the state shown in FIG. That is, the flapper 81 closes the path to the second path 78 and opens the path to the first path 75. Note that “closing the path to the second path 78” does not always mean that the path to the second path 78 is completely closed. For example, the path to the second path 78 is partially closed. It is an expression including the form which suppresses approach of sheet S. The same applies to “open”. Therefore, the sheet S fed from between the second LF roller 31 and the driven roller 32 is conveyed along the first path 75 as the leading edge thereof moves along the flapper 81.

  The driven roller 36 rotates counterclockwise when viewed from the front side as the second LF roller 31 rotates. When the leading end of the sheet S reaches the contact portions of the peripheral surfaces of the second LF roller 31 and the driven roller 36, a conveying force is applied from the second LF roller 31 to the sheet S.

  The sheet S that has passed between the second LF roller 31 and the driven roller 36 is discharged, for example, in a state straddling the discharge unit 37 and the tray 3. The leading end of the sheet S is placed on the tray 3 beyond the right edge of the discharge unit 37, for example. For example, the rear end of the sheet S remains on the discharge unit 37 and is placed on the discharge unit 37. Thereby, it is suppressed that the sheet S on the discharge unit 37 overlaps with the sheet placed across the supply unit 21 and the tray 3.

<Image reading operation 2>

  When the image reading target sheet S in the image reading apparatus 1 is a relatively stiff sheet such as a postcard, the discharge cover 5 is opened as shown in FIGS. Moreover, the 2nd receiving member 93 is arrange | positioned in the expansion | deployment position. The sheet S is inserted between the pair of sheet width guides 22 from the right side and is placed on the upper surface 41 of the supply unit 21 on the basis of the center.

  The leading end of the sheet S is disposed on the peripheral surface of the supply roller 23. When the supply roller 23 is rotated counterclockwise as viewed from the front side, the sheet S is separated by the frictional force between the lower surface of the lowermost sheet S on the supply unit 21 and the peripheral surface of the supply roller 23. And the separation piece 25.

  The separation roller 24 is rotated counterclockwise when viewed from the front side. When the leading end of the sheet S is sandwiched between the separation roller 24 and the separation piece 25, the sheet S is separated, for example, one by one, and only one sheet S is formed between the separation roller 24 and the separation piece 25. Passing through, it is sent to the common path 55.

  The first LF roller 27 is rotated clockwise as viewed from the front side. The driven roller 28 rotates counterclockwise as viewed from the front side as the first LF roller 27 rotates. When the leading edge of the sheet S sent to the common path 55 reaches the contact portions of the peripheral surfaces of the first LF roller 27 and the driven roller 28, a conveying force is applied to the sheet S from the first LF roller 27 and the driven roller 28. The

  Thereafter, the sheet S sequentially passes over the contact glass 61 and the contact glass 63. The sheet S on the contact glass 61 and the contact glass 63 is irradiated with light from the LED light sources of the contact image sensor modules 62 and 64, respectively. Then, the reflected light on the sheet S is received by the image sensors of the contact image sensor modules 62 and 64, whereby the images drawn on both surfaces of the sheet S are read.

  The second LF roller 31 is rotated clockwise as viewed from the front side. The driven rollers 32 and 33 rotate counterclockwise when viewed from the front side. When the leading edge of the sheet S reaches the contact portions of the peripheral surfaces of the second LF roller 31 and the driven roller 32, a conveying force is applied to the sheet S from the second LF roller 31 and the driven roller 32. Thereafter, when the leading edge of the sheet S reaches the contact portions of the peripheral surfaces of the second LF roller 31 and the driven roller 33, a conveying force is applied to the sheet S from the second LF roller 31 and the driven roller 33.

  Since the discharge cover 5 is opened, the flapper 81 is located in the state shown in FIG. That is, the flapper 81 opens the path to the second path 78 and closes the path to the first path 78. Therefore, the sheet S fed from between the second LF roller 31 and the driven roller 32 is conveyed below the flapper 81.

  The sheet S that has passed under the flapper 81 is conveyed through the second path 78. When the sheet S leaves between the second LF roller 31 and the driven roller 32, the discharge of the sheet S from the housing 2 is completed. The sheet S discharged from the housing 2 is received by the first receiving member 91 and the second receiving member 93.

<Upper reading unit>

  As shown in FIGS. 5, 6, and 7, the upper reading unit 30 includes a frame 101 and two spacers 102 and 103 in addition to the contact glass 63 and the contact image sensor module 64. The contact image sensor module 64 extends in the longitudinal direction as shown in FIG. The contact image sensor module 64 is provided in the housing 2 such that the longitudinal direction is along the front-rear direction. Therefore, the contact image sensor module 64 extends in the front-rear direction in the state of being provided in the housing 2. Hereinafter, the directions of the contact image sensor module 64, the frame 101, and the two spacers 102 and 103 will be described as directions in a state in which these are provided in the housing 2.

  The frame 101 is attached to the housing 2. The frame 101 includes a left wall portion 104, a right wall portion 105, a front wall portion 106, a rear wall portion 107, a bottom wall portion 108, an insertion wall portion 109, a glass support portion 110, a glass pressing portion 111, and an engaging wall portion 112. Prepare.

  The left wall portion 104 extends in the front-rear direction and the up-down direction.

  The right wall portion 105 is provided on the right side of the left wall portion 104 with a gap. The right wall portion 105 extends in the front-rear direction and the up-down direction. The front end portion 113 and the rear end portion 114 of the right wall portion 105 are formed in a concave shape that is recessed forward.

  The front wall portion 106 is constructed between the front end of the left wall portion 104 and the front end of the right wall portion 105.

  The rear wall portion 107 is constructed between the rear end of the left wall portion 104 and the rear end of the right wall portion 105.

  The bottom wall portion 108 is constructed between the upper ends of the left wall portion 104, the right wall portion 105, the front wall portion 106 and the rear wall portion 107.

  A recess 115 is formed in the frame 101 by the left wall portion 104, the right wall portion 105, the front wall portion 106, the rear wall portion 107, and the bottom wall portion 108. The contact image sensor module 64 is accommodated in the recess 115.

  As shown in FIGS. 8 and 9, the insertion wall portion 109 is provided in a portion surrounded by the front end portion 113 of the right wall portion 103 in the concave portion 115 on the front side, the rear side, and the right side. Further, the insertion wall portion 109 is provided in a portion surrounded by the rear end portion 114 of the right wall portion 103 in the concave portion 115 on the front side, the rear side, and the right side. Each insertion wall 109 rises from the bottom wall 108 and extends in the left-right direction. As shown in FIG. 9, each insertion wall portion 109 is notched downward from its upper end edge, so that an insertion groove 116 is formed through each insertion wall portion 109 in the front-rear direction.

  As shown in FIGS. 5, 6, and 7, a pair of glass support portions 110 are provided on the front and rear sides. As shown in FIGS. 5 and 6, the front glass support portion 110 extends downward from the front wall portion 106 and bends and extends rearward. The rear glass support part 110 extends downward from the rear wall part 107 and is bent and extends forward.

  The glass pressing part 111 is provided on the right side of the front glass support part 110. The rear end portion of the glass pressing portion 111 is located above the front wall portion 106. The glass pressing part 111 is formed to be elastically deformable. By the elastic deformation of the glass pressing portion 111, the rear end portion of the glass pressing portion 111 can move in the front-rear direction.

  The engagement wall portion 112 is provided at a position that is spaced forward from the front end portion 113 and the rear end portion 114 of the front wall portion 106. Each engagement wall 112 extends in the front-rear direction and the up-down direction. As shown in FIG. 9, a notch 117 is formed in the upper end portion of each engagement wall portion 112.

  The contact image sensor module 64 includes a main body part 121 and a positioning part 122.

  The main body 121 is accommodated in the recess 115 and extends in the front-rear direction.

  The positioning part 122 protrudes to the right from the front end part and the rear end part of the main body part 121. Each positioning portion 122 is disposed on the rear side of each insertion wall portion 109. The positioning part 122 includes a protrusion 123. The protruding portion 123 protrudes forward from the positioning portion 122 and is inserted into the insertion groove 116 of the insertion wall portion 109. By inserting the projection 123 into the insertion groove 116, the contact image sensor module 64 is positioned in the left-right direction with respect to the frame 101.

  Further, the contact image sensor module 64 includes a cable 124 as shown in FIG. One end of the cable 124 is connected to the front upper end of the main body 121. The other end of the cable 124 is connected to a substrate (not shown). A middle portion of the cable 124 is bent in a zigzag manner and is disposed between the main body 121 and the bottom wall 108.

  As shown in FIG. 10, the spacer 102 includes a first portion 131, a second portion 132, an engaging portion 133, and a protruding portion 134.

  The first portion 131 extends in the left-right direction. The first portion 131 includes a protruding shaft 135 that protrudes upward from the upper surface thereof.

  The second portion 132 extends to the right side of the first portion 131 and extends in the front-rear direction.

  The engaging portion 133 extends upward from the right end edge of the second portion 132. A protrusion 136 is formed at the tip of the engaging portion 133. The protrusion 136 protrudes from the engagement portion 133 to the right and extends in the front-rear direction.

  The protrusion 134 is provided at a position offset to the rear side of the lower surface 137 of the second portion 132. The protruding portion 134 is formed such that the protruding amount with respect to the left lower surface 137 is larger than the protruding amount with respect to the right lower surface 137. The protrusion 134 has an inclined portion inclined downward from the right side to the left side.

  The first portion 131 is disposed below the front end portion of the main body 121 of the contact image sensor module 64. In this state, the protruding shaft 135 is fitted into a hole 138 formed in the main body 121 as shown in FIG. The second portion 132 covers the positioning part 122 on the front side of the contact image sensor module 64 from below. The engaging portion 133 enters between the front end portion 113 of the right wall portion 103 and the engaging wall portion 112. Then, the protrusion 136 of the engaging portion 133 enters the notch 117 of the engaging wall portion 112, and the protrusion 136 engages with the engaging wall portion 112. Thereby, the spacer 102 is attached to the frame 101.

  As shown in FIG. 11, the spacer 103 includes a first portion 141, a second portion 142, an engaging portion 143, and a protruding portion 144.

  The first portion 141 extends in the left-right direction. The first portion 141 includes a protruding shaft 145 that protrudes upward from the upper surface thereof.

  The second portion 142 extends to the right side of the first portion 141 and extends in the front-rear direction.

  The engaging portion 143 extends upward from the right end edge of the second portion 142. A protrusion 146 is formed at the tip of the engaging portion 143. The protrusion 146 protrudes to the right side from the engaging portion 143 and extends in the front-rear direction.

  The protruding portion 144 is provided at a position offset to the rear side of the lower surface 147 of the second portion 142. The protruding portion 144 is formed so that the protruding amount with respect to the left lower surface 147 is larger than the protruding amount with respect to the right lower surface 147. The protrusion 144 has an inclined portion inclined downward from the right side to the left side.

  The first portion 141 is disposed below the rear end portion of the main body 121 of the contact image sensor module 64. In this state, the projecting shaft 145 is fitted into a hole (not shown) formed in the main body 121. As shown in FIG. 12, the second portion 142 covers the positioning portion 122 on the rear side of the contact image sensor module 64 from below. The engaging portion 143 enters between the rear end portion 114 of the right wall portion 103 and the engaging wall portion 112. Then, the protrusion 146 of the engagement portion 143 enters the notch 117 of the engagement wall portion 112, and the protrusion 146 engages with the engagement wall portion 112. As a result, the spacer 103 is attached to the frame 101.

  The front end portion of the contact glass 63 is inserted between the first portion 131 of the spacer 102 and the front glass support portion 110. Accordingly, the first portion 131 of the spacer 102 is interposed between the contact glass 63 and the front end portion of the main body 121 of the contact image sensor module 64. On the other hand, the rear end portion of the contact glass 63 is inserted between the first portion 141 of the spacer 103 and the rear glass support portion 110. Accordingly, the first portion 141 of the spacer 103 is interposed between the contact glass 63 and the rear end portion of the main body 121 of the contact image sensor module 64.

  The right edge of the contact glass 63 is in contact with the second portion 132 of the spacer 102 and the second portion 142 of the spacer 103. The second portions 132 and 142 are interposed between the contact glass 63 and the engaging wall portion 112.

  Further, when the front end portion of the contact glass 63 is inserted between the first portion 131 of the spacer 102 and the front glass support portion 110, the glass pressing portion 111 is elastically deformed, and the rear end portion of the glass pressing portion 111. Is moved forward. After the front end portion of the contact glass 63 is inserted between the first portion 131 of the spacer 102 and the front glass support portion 110, the contact glass 63 is pressed rearward by the rear end portion of the glass pressing portion 111. . By this pressing, the rear end portion of the contact glass 63 comes into contact with the rear glass support portion 110. As a result, the contact glass 63 is sandwiched between the glass pressing portion 111 and the rear glass support portion 110 and is attached to the frame 101 while being supported by the glass support portion 110 from below.

<Effect>

  As described above, the first portion 131 of the spacer 102 and the first portion 141 of the spacer 103 are interposed between the contact image sensor module 64 and the contact glass 63. As a result, the distance between the contact image sensor module 64 and the contact glass 63 is adjusted to a certain distance, that is, the thickness of the first portions 131 and 141. Therefore, the distance between the sheet S arranged on the contact glass 63 and the contact image sensor module 64 can be set to a constant distance. As a result, the image of the sheet S can be satisfactorily read by the contact image sensor module 64.

  The second portions 132 and 142 are interposed between the contact glass 63 and the engaging wall portion 112. Therefore, the size of the contact glass 63 in the left-right direction can be reduced as compared with the configuration in which the contact glass 63 extends to the engagement wall portion 112.

  The spacers 102 and 103 include protrusions 134 and 144, respectively. Therefore, when the sheet S is conveyed, the sheet S can be rubbed against the protrusions 134 and 144. The protruding portions 134 and 144 are formed such that the protruding amount with respect to the left lower surface 137 is larger than the protruding amount with respect to the right lower surface 137. Therefore, the sheet S can be smoothly guided onto the contact glass 63 by the protrusions 134 and 144.

  Further, in a state where the spacer 102 is attached to the frame 101, the engaging portion 133 of the spacer 102 and the engaging portion 143 of the spacer 103 are engaged with the engaging wall portion 112. Thereby, it is possible to suppress the spacers 102 and 103 from floating from the frame 101. As a result, the movement of the contact image sensor module 64 can be suppressed by the first portion 131 of the spacer 102 and the first portion 141 of the spacer 103.

  Further, the second portion 132 of the spacer 102 covers the positioning portion 122 on the front side of the contact image sensor module 64 from below. The second portion 142 of the spacer 103 covers the positioning portion 122 on the rear side of the contact image sensor module 64 from the lower side. Therefore, the second portions 132 and 142 can suppress the positioning portion 122 from moving downward. As a result, the movement of the contact image sensor module 64 can be suppressed.

<Modification>

  As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, in the above-described embodiment, the configuration in which the protrusion 123 is inserted into the insertion groove 116 is taken up as a configuration for positioning the contact image sensor module 64 in the left-right direction with respect to the frame 101. However, the present invention is not limited to this configuration, and for example, a contact image sensor module is formed by forming a hole in the positioning portion 122 and forming a protrusion extending in the front-rear direction on the insertion wall portion 109 and inserting the protrusion into the hole. 64 may be positioned in the left-right direction with respect to the frame 101. That is, if the contact image sensor module 64 can be disposed at a substantially constant position in the frame 101 in the left-right direction, the configuration for positioning the contact image sensor module 64 in the left-right direction with respect to the frame 101 is Various configurations can be employed.

  In addition, various design changes can be made to the above-described configuration within the scope of the matters described in the claims.

DESCRIPTION OF SYMBOLS 1 Image reader 2 Housing | casing 27 1st LF roller 28 Driven roller 31 2nd LF roller 32 Driven roller 33 Driven roller 36 Driven roller 30 Upper reading part 63 Contact glass 64 Contact | adherence image sensor module 102 Spacer 103 Spacer 122 Positioning part 131 1st part 132 Second part 134 Protruding part 133 Engaging part 141 First part 142 Second part 143 Engaging part 144 Protruding part

Claims (4)

A housing,
A transport unit provided in the housing and configured to transport a sheet in a first direction;
A reading unit provided in the housing, extending in a second direction orthogonal to the first direction, and configured to read an image of a sheet conveyed by the conveying unit;
A translucent member located on one side of a third direction orthogonal to the first direction and the second direction with respect to the reading unit;
An image reading apparatus, comprising: a spacer having a first portion interposed between the reading portion and the translucent member; and a second portion extending from the first portion to one side in the first direction. .   The spacer protrudes from the second portion to the one side in the third direction, and has a protruding portion whose protruding amount on the other side in the first direction is larger than the protruding amount on the one side in the first direction. The image reading apparatus according to claim 1.   The spacer includes an engaging portion configured to extend from the second portion to the other side in the third direction, a tip portion thereof extending to the one side in the first direction, and to engage with the housing. The image reading apparatus according to claim 1, further comprising: The reading unit includes a main body that extends in the second direction, and a positioning unit that protrudes from the main body to the one side in the first direction and is configured to position the reading unit on the housing. ,
The image reading apparatus according to claim 1, wherein the second portion covers the positioning portion from one side in the third direction.

Images