MEDIUM FEEDING DEVICE

Abstract

A manual paper feeding portion includes a medium placing portion on which paper to be fed is placed, a guide portion that is provided on the medium placing portion, guides a side edge of the paper in a width direction intersecting with a feeding direction, and is movable in the width direction, and a positioning mechanism that determines a position of the guide portion in the width direction, in which the positioning mechanism regulates the position of the guide portion by positioning portions arranged with a predetermined interval in a first region of a moving region of the guide portion and regulates the position of the guide portion in a stepless manner in a second region which is a region other than the first region.

Claims

1. A medium feeding device comprising: a medium placing portion on which a medium to be fed is placed; a guide portion that is provided on the medium placing portion, guides a side edge of the medium in a width direction intersecting with a feeding direction of the medium, and is movable in the width direction; and a positioning mechanism that determines a position of the guide portion in the width direction, wherein the positioning mechanism regulates the position of the guide portion by positioning portions arranged with a predetermined interval in a first region of a moving region of the guide portion and regulates the position of the guide portion in a stepless manner in a second region which is a region other than the first region.

2. The medium feeding device according to claim 1, wherein the positioning mechanism includes a protruding portion that is provided on a side of the guide portion, a plurality of recessed portions, as the positioning portions, that is provided with the predetermined interval on a part corresponding to the first region in the medium placing portion and regulates the position of the guide portion by receiving the protruding portion, and a friction member that is provided on a part corresponding to the second region in the medium placing portion and regulates the position of the guide portion by frictional resistance between the protruding portion and the friction member.

3. The medium feeding device according to claim 2, wherein a height of an opening edge of the recessed portion and a height of a contact surface of the friction member with the protruding portion are the same as each other.

4. A medium feeding device comprising: a medium placing portion on which a medium to be fed is placed; a guide portion that is provided on the medium placing portion, guides a side edge of the medium in a width direction intersecting with a feeding direction of the medium, and is movable in the width direction; and a positioning mechanism that determines a position of the guide portion in the width direction, wherein the positioning mechanism regulates the position of the guide portion by first positioning portions arranged with a first interval in a first region of a moving region of the guide portion and regulates the position of the guide portion by a second positioning portion disposed with a second interval narrower than the first interval in a second region which is a region other than the first region.

5. The medium feeding device according to claim 4, wherein the positioning mechanism includes a protruding portion that is provided on a side of the guide portion, a plurality of first recessed portions, as the first positioning portions, that is provided with the first interval on a part corresponding to the first region in the medium placing portion and regulates the position of the guide portion by receiving the protruding portion, and a plurality of second recessed portions, as the second positioning portions, that is provided with the second interval on a part corresponding to the second region in the medium placing portion and regulates the position of the guide portion by receiving the protruding portion.

6. The medium feeding device according to claim 2, wherein the protruding portion is configured to be displaceable between a contact state in which the protruding portion comes into contact with the recessed portion and the friction member or the first recessed portion and the second recessed portion and a separated state in which the protruding portion is separated from the recessed portion and the friction member or the first recessed portion and the second recessed portion, and is pressed in the contact state.

7. The medium feeding device according to claim 1, wherein the second region is disposed in an inside of the first region in the width direction of the medium.

8. The medium feeding device according to claim 7, wherein the second region is a region where the guide portion regulates the position of the side edge of a medium having a postcard size or less in the width direction.

9. The medium feeding device according to claim 1, wherein the moving region of the guide portion includes an outside first region which is a first region provided to the outside of the medium in the width direction, an inside first region which is a first region provided in the inside of the medium in the width direction, and a second region which is provided between the outside first region and the inside first region, and wherein the second region is a region where the position of the side edge of a medium having at least a postcard size in the width direction is regulated.

10. A recording apparatus comprising: the medium feeding device according to claim 1, and a recording portion that performs recording on a medium to be fed from the medium feeding device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The disclosure will be described with reference to the accompanying drawings, wherein like numbers reference like elements.

[0038] FIG. 1 is an external perspective view of a printer according to a first embodiment of the disclosure.

[0039] FIG. 2 is a perspective view illustrating a manual paper feeding portion in a developed state.

[0040] FIG. 3 is a schematic diagram illustrating a transportation path of paper in the printer.

[0041] FIG. 4 is a perspective view illustrating a main part of a medium placing portion.

[0042] FIG. 5 is a plan view illustrating the main part of the medium placing portion.

[0043] FIG. 6 is a view describing a moving mechanism in a guide portion.

[0044] FIG. 7 is a sectional view illustrating a state in which the guide portion of a first placing portion is positioned in a first region.

[0045] FIG. 8 is a sectional view illustrating a state in which the guide portion of the first placing portion is positioned in a second region.

[0046] FIG. 9 is an enlarged view of the main part of FIG. 7.

[0047] FIG. 10 is a perspective view illustrating a switching mechanism in a case in which a protruding portion is set in a contact state.

[0048] FIG. 11 is a perspective view illustrating the switching mechanism in a case in which the protruding portion is set in a separated state.

[0049] FIG. 12 is a view describing an operation of the switching mechanism.

[0050] FIG. 13 is a view describing the operation of the switching mechanism.

[0051] FIG. 14 is a view describing a positioning mechanism according to a second embodiment.

[0052] FIG. 15 is a view describing a medium placing portion according to a third embodiment.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

First Embodiment

[0053] First, an outline of a recording apparatus according to an embodiment of the disclosure will be described. As an example of the recording apparatus of this example, an ink jet printer 1 (hereinafter, simply refer to as printer 1) is exemplified.

[0054] FIG. 1 is an external perspective view of the printer according to the example of the disclosure. FIG. 2 is a perspective view illustrating a manual paper feeding portion in a developed state. FIG. 3 is a schematic diagram illustrating a transportation path of paper in the printer. FIG. 4 is a perspective view illustrating a main part of a medium placing portion. FIG. 5 is a plan view illustrating the main part of the medium placing portion. FIG. 6 is a view describing a moving mechanism of a guide portion. FIG. 7 is a sectional view illustrating a state in which the guide portion of a first placing portion is positioned in a first region. FIG. 8 a sectional view illustrating a state in which the guide portion of the first placing portion is positioned in a second region. FIG. 9 is an enlarged view of the main part of FIG. 7. FIG. 10 is a perspective view illustrating a switching mechanism in a case in which a protruding portion is set in a contact state. FIG. 11 is a perspective view illustrating a switching mechanism in a case in which the protruding portion is set in a separated state. FIGS. 12 and 13 are views describing an operation of the switching mechanism.

[0055] Regarding an X-Y-Z coordinate system illustrated in each drawing, an X direction indicates a width direction of a recording medium in a transportation path in the recording apparatus, a Y direction indicates a transporting direction of the recording medium, and a Z direction indicates a height direction of the apparatus. In each drawing, a X direction is set to a front surface side of the apparatus, and a +X direction side is set to a rear surface side of the apparatus.

Outline of Printer

[0056] Hereinafter, the printer 1 will be mainly described with reference to FIG. 1.

[0057] The printer 1 is configured as a complex machine including a recording unit 2 that includes a line head 10 as a recording portion which performs recording on paper therein, and a scanner unit 3 that reads an original document. The recording unit 2 includes a plurality of paper accommodating cassettes 4 which accommodates a bundle of paper. Each paper accommodating cassette 4 is detachably attached to a front surface side (X axis direction side in FIG. 1) of the recording unit 2. Moreover, in this specification, the paper as a medium means paper such as plain paper, cardboard, or photo paper.

[0058] The paper accommodated in the paper accommodating cassette 4 is transported to the line head 10, and a recording operation is performed. In the embodiment, the paper recorded by the line head 10 is discharged from either of a first discharging portion 7 for stacking paper P (FIG. 3) on a first paper discharging tray 5 provided on the line head 10 and a second discharging portion 9 (FIG. 3) for stacking the paper on a second paper discharging tray 8 (FIG. 3) provided on a side surface of a +Y direction side of the recording unit 2.

[0059] The recording unit 2 is configured to be capable of feeding paper from the manual paper feeding portion 11 (also refer to FIGS. 2 and 3) as a medium feeding device, in addition to a case in which recording is performed by feeding the paper accommodated in the paper accommodating cassette 4. In other words, the line head 10 is capable of performing recording on the paper fed from the manual paper feeding portion 11.

[0060] The manual paper feeding portion 11 is provided on a side surface of a Y direction side of the recording unit 2, and may become a stored state of being stored integrally with the side surface as illustrated in FIG. 1 or become a developed state in which the manual paper feeding portion is opened as illustrated in FIG. 2 and the medium placing portion where paper is placed appears. The manual paper feeding portion 11 opens and closes by being rotated around a rotating shaft 11a (FIG. 3) as a shaft, and is displaced between the stored state and the developed state. Also, a more specific configuration of the manual paper feeding portion 11 will be described later.

[0061] In addition, an operation panel 6 is provided on a front surface side of the recording unit 2. A display unit such as a liquid crystal panel is provided in the operation panel 6. In addition, instructions of a recording operation and an image reading operation can be input to the printer 1 by operating the operation panel 6.

Regarding Transportation Path of Printer

[0062] Next, with reference to FIG. 3, a transportation path of paper from the manual paper feeding portion 11 in the printer 1 will be described.

[0063] In FIG. 3, a dotted line illustrated by a reference number 12 is a first feeding path 12 which is a feeding path in a case in which paper is fed from the manual paper feeding portion 11. The paper set in the manual paper feeding portion 11 is fed by a first feeding roller 17 and is entered to a straight path 13 (illustrated by broken line) from the first feeding path 12.

[0064] A resist roller 19 is provided on a downstream side of the first feeding roller 17 in a transporting direction. In the embodiment, the first feeding path 12 and the straight path 13 are connected to each other at a position of the resist roller 19.

[0065] The straight path 13 is configured as a path extending in a substantially straight line shape, and a pair of upstream side transporting rollers 20, the line head 10, and a pair of downstream side transporting rollers 21 are formed on a downstream side of the resist roller 19. A recording region by the line head 10 is included in the straight path 13.

[0066] A supporting portion 22 which supports paper from an opposite side of a recording surface thereof is disposed on a region facing a head surface of the line head 10.

[0067] The line head 10 is configured to perform recording by ejecting ink (liquid) to a recording surface of paper after the paper is transported to the recording region facing the line head 10 on the supporting portion 22. The line head 10 is a recording head provided to cover the entire width of the paper with nozzles which eject ink, and is configured as a recording head capable of performing recording on the entire width of a medium without being moved in a medium width direction of the medium.

[0068] Also, the printer 1 of the example includes the line head 10, but may include a serial type recording head which is mounted in a carriage and performs recording by ejecting liquid to a medium while reciprocating in a direction intersecting with a transporting direction of the medium.

[0069] Subsequently, the paper on which recording is performed by the line head 10 is transported to either of a first discharging path 14 (illustrated by two-dot chain line in FIG. 3) and a second discharging path 24 (illustrated by long and short dash line in FIG. 3) from the straight path 13 according to a discharging destination of the recorded paper.

[0070] The first discharging path 14 is a curved path connected to the straight path 13 on a downstream side of the line head 10, and is a path where the paper is fed to be discharged from the first discharging portion 7 with a recording surface of the paper down.

[0071] The second discharging path 24 is a path extending in a substantially straight line shape from the straight path 13 on a downstream side of the line head 10, and is a path where the paper is fed to be discharged from the second discharging portion 9 with the recording surface of the paper up.

[0072] The first discharging path 14 and the second discharging path 24 are provided to be branched from the straight path 13 on a downstream side of the pair of downstream side transporting rollers 21.

[0073] The paper fed from the straight path 13 to the first discharging path 14 is discharged from the first discharging portion 7 and is placed on the first paper discharging tray 5 with the recording surface of the paper down.

[0074] In addition, the paper fed from the straight path 13 to the second discharging path 24 is discharged from the second discharging portion 9 and is placed on the second paper discharging tray 8 with the recording surface of the paper up.

[0075] Also, the paper accommodated in the paper accommodating cassette 4 is picked up by a second feeding roller 18 and is transported to a second feeding path 25 (illustrated by solid line in FIG. 3). The second feeding path 25 joins the straight path 13 in front of the resist roller 19. Since a transportation path subsequent to the straight path 13 is the same as the transportation path of the paper fed from the manual paper feeding portion 11, description thereof will be omitted.

[0076] In addition, the printer 1 is capable of performing double-side recording in which recording is performed on a first surface and then the recording is performed on a second surface which is a rear surface thereof. The paper in which the recording is performed on the first surface is reversed through a switch-back path 15 and a reverse path 16.

Regarding Manual Paper Feeding Portion

[0077] Hereinafter, a configuration of the manual paper feeding portion 11 (medium feeding device) which is a main part of the disclosure will be described.

[0078] The manual paper feeding portion 11 illustrated in FIG. 2 includes the medium placing portion 30 on which paper to be fed is placed and guide portions 31a and 31b which are provided on the medium placing portion 30 and guide a side edge of the paper in a width direction (X axis direction) intersecting with a feeding direction (+Y direction) of the paper.

[0079] The medium placing portion 30 illustrated in FIG. 2 includes the guide portions 31a and 31b provided therein and also includes a first placing portion 32 (also refer to FIGS. 4 and 5) including bearing portions 35a and 35b (FIG. 4) receiving the rotating shaft 11a (FIG. 3) provided on a main body of the recording unit 2, a second placing portion 33 which supports the paper on an upstream side of the first placing portion 32, and a third placing portion 34 which is provided to be stored in the second placing portion 33 and can be taken out. The third placing portion 34 is configured to be taken out corresponding to a length (size of medium in transporting direction) of the paper being set in the medium placing portion 30. In addition, when the manual paper feeding portion 11 is set in the stored state (FIG. 1), the third placing portion 34 is stored in the second placing portion 33.

[0080] The guide portions 31a and 31b are provided to slide and be movable in the X axis direction corresponding to a width size of the paper with respect to an upper surface of the first placing portion 32. In the example, the guide portions 31a and 31b follow movement of one guide portion 31a in the X axis direction, and moves in a direction opposite to the other guide portion 31b.

[0081] That is, in the medium placing portion 30, the paper is provided to the center in a width direction, and is configured to feed paper in a called center paper feeding method.

[0082] Also, in FIG. 5, positions of the guide portions 31a and 31b illustrated by a solid line is a position corresponding to a side edge of the paper having a maximum width size at which the paper can be placed on the medium placing portion 30, positions of the guide portions 31a and 31b illustrated by a dotted line is a position corresponding to the side edge of the paper having a minimum width size at which the paper can be placed on the medium placing portion 30, and positions of the guide portions 31a and 31b illustrated by a two-dot chain line is a position corresponding to the side edge of the paper having a postcard width size.

Regarding Moving Mechanism of Guide Portion

[0083] Hereinafter, with reference to FIG. 6, the guide portion 31a and the guide portion 31b will be described.

[0084] As a moving mechanism of the guide portion 31a and the guide portion 31b, an arm portion 36a in which one end side extending in the X axis direction is provided in the guide portion 31a, and an arm portion 36b in which one end side extending in the X axis direction is provided in the guide portion 31b, a rack portion 38a constituted by a plurality of teeth 37a provided in the arm portion 36a, and a rack portion 38b constituted by a plurality of teeth 37b provided in the arm portion 36b, and a pinion teeth wheel 39 which is rotatably attached to the center of the first placing portion 32 in the width direction are included. The rack portion 38a and the rack portion 38b are engaged with the pinion teeth wheel 39 as illustrated in an upper drawing of FIG. 6.

[0085] Also, in FIG. 6, the first placing portion 32 is illustrated by a dotted line. The moving mechanism (arm portions 36a and 36b, rack portions 38a and 38b, and pinion teeth wheel 39) of the guide portion 31a and the guide portion 31b is actually disposed on a lower surface (Z direction side) of the first placing portion 32.

[0086] In the upper drawing of FIG. 6, the guide portions 31a and 31b are disposed at a position corresponding to a width direction of the paper having a maximum size at which the paper can be set in the medium placing portion 30, that is, are disposed on the outermost side. In a state of the upper drawing of FIG. 6, when the guide portion 31a is moved from the outside to the inside in the width direction, that is, when the guide portion is moved in the +X direction, the arm portion 36a is also moved in the +X direction, and thus the pinion teeth wheel 39 engaged with the rack portion 38a is rotated in a A direction of directions illustrated by a double-head arrow.

[0087] When the pinion teeth wheel 39 is rotated in the A direction, the arm portion 36b including the rack portion 38b engaged with the pinion teeth wheel 39 is moved in the X direction. Therefore, the guide portion 31b is also moved in the x direction. Intervals between the plurality of teeth 37a and intervals between the plurality of teeth 37b are set to be the same as each other, and when the guide portion 31a is moved to the inside in the width direction of the paper, as illustrated in a lower drawing of FIG. 6, the guide portion 31b is also moved to the inside in the width direction of the paper in the same as that of the guide portion 31a.

[0088] Conversely, in a case in which the guide portion 31a is moved from the inside to the outside in the width direction, that is, the guide portion is moved in the X direction, the pinion teeth wheel 39 is rotated in a +A direction, and the guide portion 31b is moved in the +X direction.

Positioning Mechanism of Guide Portion

[0089] Here, in order to appropriately match positions of the guide portion 31a and the guide portion 31b to a width size of the paper set in the medium placing portion 30, in the first placing portion 32, as illustrated in FIGS. 4 and 5, a positioning mechanism 40 which determines the positions of the guide portions 31a and 31b in the width direction is provided. In the embodiment, the positioning mechanism 40 is provided in a moving region M (FIG. 7) of the guide portion 31a which is one of the guide portions.

[0090] Also, the positioning mechanism 40 regulates the position of the guide portion 31a by a positioning portion 41a disposed with predetermined intervals d (FIG. 9) in a first region M1, and regulates the position of the guide portion 31a in a stepless manner in a second region M2 which is a region other than the first region M1, in the moving region M of the guide portion 31a illustrated in FIG. 7.

[0091] More specifically, as illustrated in FIGS. 7 and 9, the positioning mechanism 40 includes a protruding portion 42 provided on a guide portion 31a side, a plurality of recessed portions 43a as the positioning portion 41a which is provided with predetermined intervals d (FIG. 9) on a part corresponding to the first region M1 in the first placing portion 32 (medium placing portion 30) and regulate the position of the guide portion 31a receiving the protruding portion 42, and a friction member 44 which is provided on a part corresponding to the second region M2 in the first placing portion 32 (the medium placing portion 30) illustrated in FIG. 7 and regulates the position of the guide portion 31a due to a frictional resistance between the protruding portion 42 with the guide portion. As the friction member 44, an elastic member including the frictional resistance such as rubber, cork, or a resin material is used.

[0092] The position of the guide portion 31a in the first region M1 is determined, as illustrated in FIG. 7, by engaging the protruding portion 42 provided on the guide portion 31a side with the plurality of recessed portions 43a which is provided with a predetermined interval d (FIG. 9) on a first placing portion 32 side. Therefore, an accuracy of position determination in the first region M1 becomes an accuracy in accordance with the predetermined intervals d between the plurality of recessed portions 43a.

[0093] Meanwhile, since the position of the guide portion 31a in the second region M2 is determined by regulating the position of the guide portion 31a due to the frictional resistance between the friction member 44 and the protruding portion 42 as illustrated in FIG. 8, the position of the guide portion 31a can be regulated in a stepless manner. Therefore, an accuracy of the position determination in the second region M2 is higher than an accuracy of the position determination in the first region M1.

[0094] Also, in the guide portion 31a, a switching mechanism 50 which switches a locked state in which the guide portion 31a is locked at a position determined by the positioning mechanism 40 and a non-locked state in which the position of the guide portion 31a is provided to be free so as to be changed. The switching mechanism 50 will be described later.

[0095] In addition, in a further inside (+X direction side) of the second region M2, a first region M3 is provided. The first region M3 is an inside first region which is provided in the inside of the first region M1 in a case in which the first region M1 is set as an outside first region which is the first region provided on the outside in the width direction of the paper.

[0096] In other words, in the moving region M of the guide portion 31a, the second region M2 is provided between the first region M1 (outside first region) and the first region M3 (inside first region).

[0097] Also, the second region M2 is a region where a position of a side edge in the width direction of the paper having at least a postcard size is regulated.

[0098] A plurality of recessed portions 43b as a positioning portion 41b which is provided with predetermined intervals d in the same as that of the positioning portion 41a provided in the first region M1 and regulates the position of the guide portion 31a receiving the protruding portion 42 is provided in the first region M3 on the first placing portion 32 (medium placing portion 30).

[0099] The positioning mechanism 40 which determines the position of the guide portion 31a in the width direction includes a configuration described above, and thus action effects as follows can be obtained.

[0100] That is, since the positioning mechanism 40 regulates the position of the guide portion 31a by the positioning portion 41a (recessed portion 43a) and the positioning portion 41b (recessed portion 43b) which are disposed with predetermined intervals d in the first region M1 and the first region M3, and regulates the position of the guide portion 31a in a stepless manner when the friction member 44 is disposed in the second region M2 which is a region other than the first region M1 and the first region M3, in the moving region M of the guide portion 31a, an accuracy of position determination of the guide portion 31a can be changed corresponding to the size of the paper. Therefore, the position of the guide portion 31a can be appropriately determined corresponding to the size of the paper.

[0101] If the guide portion 31a is positioned on the outside of a position suitable for the size of the paper, the paper to be guided may be inclined. For example, in a case in which positions of a corner of a distal end of the paper on a +X side and a corner of a distal end of the paper on a X side are inclined so as to be deviated by a predetermined amount (for example, 1 mm) in the Y axis direction, an angle of the inclined paper increases as the width of the paper becomes narrow. In addition, the paper tends to have a shorter length as the width becomes narrow. In a case in which a length of the paper is short, since a rear end side of the paper becomes in a state of being mostly deviated from guiding of the guide portions 31a and 31b as a distal end of the paper reaches the first feeding roller 17 illustrated in FIG. 3, it can be assumed that the angle of the inclination of the paper increases. That is, as the paper has a narrow width, an accuracy of the position determination of the guide portion 31a tends to easily influence on generation of the inclination of the paper.

[0102] In the embodiment, since the second region M2 with high accuracy of the position determination where the position can be determined in a stepless manner is a region where a position of the side edge in the width direction of the paper having at least a postcard size is regulated, generation of the inclination can be suppressed by increasing the accuracy of the position determination in a case in which the position of the side edge having a postcard size is regulated.

[0103] In addition, since the position of the guide portion 31a is regulated in a stepless manner in the second region M2 requiring a high accuracy of the position determination, and the position of the guide portion 31a is regulated by the positioning portion 41a disposed with predetermined intervals d in the first region M1 which is the other region not requiring a higher accuracy of the position determination than that of the second region M2, the positioning mechanism 40 can be formed with low costs and a simple configuration compared to a case in which the accuracy of the position determination in the entire moving region M of the guide portion 31a increases (for example, friction member is provided in the entire moving region M).

[0104] In addition, in the embodiment, the first region M3 is provided in the inside of the second region M2 in the width direction, but the first region M3 (the inside first region) cannot be provided. That is, in the moving region M of the guide portion 31a, the entire inside of the first region M1 in the width direction can be set as the second region M2. In other words, the second region M2 can be disposed in the inside in the width direction further than the first region M1.

[0105] The second region M2 is a region where the guide portion 31a regulates the position of the side edge of a medium having a size equal to or less than a postcard size in the width direction.

[0106] As seen from the above, an accuracy of the position determination in a case in which the guide portion 31a regulates the position of the side edge in the width direction of the paper having a postcard size or less increases, generation of inclination when the paper having a postcard size or less is fed can be suppressed.

[0107] Also, for example, particularly, in a case in which it is specialized that the paper having a postcard size is frequently used and an accuracy of the guide position with respect to the paper having a postcard size increases, if a configuration of FIG. 5 in which the first region M3 (inside first region) is provided is used, since a region where the friction member 44 is provided is reduced and a required friction member 44 is also reduced so that the regions are not enough, and thereby it is advantageous in regards of costs.

[0108] In addition, in the embodiment, a height of an opening edge 45 (FIG. 9) of the recessed portion 43a and a height of a contact surface of the friction member 44 with the protruding portion 42 are disposed to be the same as each other. An opening edge (not illustrated) of the recessed portion 43b also has the same height of the opening edge 45 of the recessed portion 43a.

[0109] If the height of the contact surface of the friction member 44 with the protruding portion 42 is higher than the height of the opening edge 45 of the recessed portion 43a, the guide portion 31a comes into contact with the friction member 44, and thus there is a concern that resistance is generated when the guide portion 31a is moved. If the height of the contact surface of the friction member 44 with the protruding portion 42 is lower than the height of the opening edge of the recessed portion 43a, a holding property of the protruding portion 42 on the contact surface of the friction member 44 decreases.

[0110] If the height of the opening edge 45 of the recessed portion 43a and the height of the contact surface of the friction member 44 are the same as each other, both a good mobility of the guide portion 31a in the width direction and the holding property of the protruding portion 42 on the contact surface of the friction member 44 can be achieved.

[0111] In addition, as illustrated in FIGS. 7 and 8, the recessed portion 43a, the recessed portion 43b, and the friction member 44 are positioned under a placing surface 32a which mainly supports the paper in the first placing portion 32. Accordingly, a concern that the opening edge 45 of the recessed portion 43a, the opening edge (no reference number given) of the recessed portion 43b, and the friction member 44 come into contact with the paper so as to become a transporting resistance of the paper can be reduced.

Regarding Switching Mechanism

[0112] As described above, in the guide portion 31a, the switching mechanism 50 (FIG. 4) which switches the locked state in which the guide portion 31a is locked at a position determined by the positioning mechanism 40 and the non-locked state in which the position of the guide portion 31a is provided to be free so as to be changed.

[0113] As illustrated in FIGS. 10 and 11, a part of the switching mechanism 50 is provided inside the guide portion 31a. FIGS. 10 and 11 illustrate a state in which an outer surface portion 46 constituting the guide portion 31a is removed.

[0114] The switching mechanism 50 (FIGS. 10 and 11) includes an operating portion 51 (also refer to FIG. 4) for being operated by a user, a displacement member 52 including the protruding portion 42 on a distal end thereof, and a holding portion 53 holding the displacement member 52. The operating portion 51 is attached to a shaft portion 54 connected to the holding portion 53.

[0115] As illustrated in FIG. 13, the displacement member 52 can be displaced between a contact state (left drawing of FIG. 13) in which the protruding portion 42 comes into contact with the recessed portions 43a and 43b and the friction member 44 and a separated state (right drawing of FIG. 13) in which the protruding portion is separated from the recessed portion 43a and the friction member 44, and is pressed in the contact state by a pressing member 55 such as a coil spring.

[0116] Also, the guide portion 31a is locked (in locked state) when the protruding portion 42 is in the contact state, and the guide portion 31a can be freely moved (in non-locked state) when the protruding portion 42 is in the separated state.

[0117] More specifically, as illustrated in left drawings of FIGS. 10 and 12, in a case in which the operating portion 51 is disposed toward a surface of the outer surface portion 46, the protruding portion 42 becomes in the contact state as illustrated in the left drawing of FIG. 13, that is, the guide portion 31a becomes in the locked state, as illustrated in right drawings of FIGS. 11 and 12, in a case in which the operating portion 51 is rotated in a clockwise direction when seen from the Y direction side, the displacement member 52 is displaced upwardly, and the protruding portion 42 becomes in the separated state as illustrated in the right drawing of FIG. 13, that is, the guide portion 31a becomes in the non-locked state.

[0118] When the protruding portion 42 is fit into the recessed portions 43a and 43b and is pressed, the protruding portion 42 is reliably held by the recessed portions 43a and 43b. In addition, when the protruding portion 42 comes into contact with the friction member 44 and is pressed, the protruding portion 42 is pushed into the friction member 44 (formed of elastic member such as rubber or cork) so as to be reliably held. Therefore, the guide portion 31a can be reliably held at a determined position.

[0119] Also, in FIG. 12, a position B1 illustrated by a dotted line is a position of the protruding portion 42 in a Z axis direction in the contact state, and a position B2 illustrated by a dotted line is a position of the protruding portion 42 in the Z axis direction in the separated state.

Second Embodiment

[0120] In a second embodiment, with reference to FIG. 14, another example of the positioning mechanism will be described. FIG. 14 is a view describing a positioning mechanism according to the second embodiment. In the embodiment, a reference number same as that of the first embodiment is given to a configuration same as that of the first embodiment, and description thereof will be omitted.

[0121] A positioning mechanism 60 illustrated in FIG. 14 regulates the position of the guide portion 31a by first recessed portions 61a and 61b as a first positioning portion disposed with a first interval d1 in the first regions M1 and M3 in the moving region M of the guide portion 31a, and regulates the position of the guide portion 31a by a second recessed portion 62 as a second positioning portion disposed with a second interval d2 which is narrower than the first interval d1 in the second region M2 which is a region other than the first regions M1 and M3.

[0122] The first recessed portions 61a and 61b and the second recessed portion 62 regulate the position of the guide portion 31a receiving the protruding portion 42 provided on the guide portion 31a side.

[0123] In the first embodiment, in the second region M2, the position of the guide portion 31a is regulated in a stepless manner by the friction member 44, but in this embodiment, the position of the guide portion 31a can be regulated by the second recessed portion 62 disposed with the second interval d2 in the second region M2 narrower than the first interval d1 in the first regions M1 and M3.

[0124] Since the second recessed portions 62 are provided with narrower intervals than the first recessed portions 61a and 61b, an accuracy of the position determination of the guide portion 31a in the second region M2 can be increased more than an accuracy of the position determination of the guide portion 31a in the first regions M1 and M3.

[0125] In addition, in the embodiment, the protruding portion 42 can be displaced between a contact state of coming into contact with the first recessed portions 61a and 61b and the second recessed portion 62 and a separated state of being separated from the first recessed portions 61a and 61b and the second recessed portion 62, and is pressed in the contact state by the pressing member 55. Therefore, the guide portion 31a can be reliably held at a determined position.

Third Embodiment

[0126] In a third embodiment, with reference to FIG. 15, still another example of the medium placing portion constituting the manual paper feeding portion (medium feeding device) will be described. FIG. 15 is a view describing a medium placing portion according to the third embodiment.

[0127] A medium placing portion 70 described in this embodiment includes a pair of guide portions 71a and 71b which guides the side edge in the width direction of the paper. In the guide portions 71a and 71b, so-called a biasing paper feeding method in which one guide portion 71b is fixed and the other guide portion 71a is only moved in the X axis direction is used.

[0128] An upper drawing of FIG. 15 illustrates a state in which the guide portion 71a is disposed at a position in accordance with the side edge of the paper having a maximum width size which can be placed on the medium placing portion 70, and a lower drawing of FIG. 15 illustrates a state in which the guide portion 71a is disposed at a position in accordance with the side edge of the paper having a postcard size.

[0129] In the medium placing portion 70, a positioning mechanism 72 configured to be the same as the positioning mechanism 40 in the first embodiment is provided with respect to the guide portion 71a to be moved.

[0130] The positioning mechanism 72 is provided in the moving region M (FIG. 7) of the guide portion 71a, and regulates the position of the guide portion 31a by a recessed portion 73a and a recessed portion 73b (positioning portion) disposed with predetermined intervals in the first region M1 and the first region M3, and regulates the position of the guide portion 31a in a stepless manner by the friction member 74 in the second region M2 which is a region between the first region M1 and the first region M3, in the moving region M. The second region M2 is a region where the position of the side edge in the width direction of the paper having at least a postcard size is regulated.

[0131] Also, the protruding portion (not illustrated) can be fit into the recessed portion 73a is provided on the guide portion 31a side.

[0132] With the configuration described above, effects the same as the effects described in the first embodiment can be obtained.

[0133] Also, in the positioning mechanism 72, in the same manner as the first embodiment, the friction member 74 is provided in the first region M3, the entire inside of the first region M1 in the width direction can be set to the second region M2. In addition, instead of the positioning mechanism 72, a positioning mechanism having the same configuration as the positioning mechanism 60 in the second embodiment can be provided.

[0134] Also, the configuration of the positioning mechanism of the guide portion described in each embodiment can be applied to, for example, a positioning mechanism that guides a rear end of the paper in the transporting direction and guides the rear end to be movable in a direction (Y axis direction) along the transporting direction corresponding to a size of paper.

[0135] In addition, a medium feeding device that feeds an original document to be read by an image reading apparatus represented by a scanner can be provided.

[0136] In addition, the disclosure is not limited to the embodiments described above, various modification can be made within a range of the disclosure disclosed in claims, and it is needless to say that modifications thereof are also included in the range of the disclosure.