JP2017159992A - Medium feeding unit, image reader and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feeding unit capable of obtaining effect for appropriately improving separability.SOLUTION: A medium feeding unit comprises: a medium placement section placing a medium; a feeding roller feeding the medium from the medium placement section; and a belt unit comprising a separation belt separating the medium between the feeding roller and the separation belt by nipping the medium. The belt unit comprises: a first pulley of which rotation is imparted with resistance; and a freely rotatable second pulley. The separation belt is wound around the first pulley and the second pulley. The first pulley is provided at a medium feeding direction upstream side, and the second pulley is provided at a medium feeding direction downstream side. A contact position between the separation belt and the feeding roller is positioned closer to the medium feeding direction upstream side in the separation belt.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a medium feeding apparatus for feeding a medium, and an image reading apparatus and a recording apparatus including the medium feeding apparatus.

  Hereinafter, a scanner which is an example of an image reading apparatus will be described as an example. The scanner is provided with a feeding device (also called ADF (Auto Document Feeder)) that automatically feeds a document that is an example of a medium, and may be configured to automatically feed and read a plurality of documents. is there.

  As a configuration of such a feeding device, as shown in Patent Document 1, a tray on which a document is placed (“Shooter 14” in Patent Document 1) and a surface of the document set in the tray are brought into contact. And a separation roller for separating the document in contact with the feeding roller (“separation roller 12” in Patent Document 1). There is something with.

  The feeding roller described in Patent Literature 1 is configured to sequentially feed a lower sheet, that is, a sheet on the tray mounting surface side, among a plurality of sheets (sheet bundle) stacked on the tray. The upper sheet, that is, the sheet to be separated, comes into contact with the separation roller so that the downstream sheet is prevented from proceeding downstream.

Japanese Patent No. 4820314

  The effect of separating the paper by the separation roller is exhibited by the frictional force between the paper to be fed and the separation roller. In order to increase the frictional force in order to improve the separation performance, it is conceivable to increase the urging force for urging the separation roller toward the feeding roller.

  However, increasing the urging force that urges the separation roller toward the feeding roller increases the frictional force between the paper that is about to be fed and the separation roller. Further, since the frictional force between the sheets increases, there is an adverse effect that the double feed tendency also increases.

  Further, as a measure for increasing the frictional force, it is conceivable to soften the material of the separation roller and increase the contact length between the paper to be double fed and the separation roller. If the material of the separation roller is made soft, the effect of preventing double feeding can be obtained, but on the other hand, the paper to be double fed is likely to push the separation roller, and the double feeding tendency also increases.

  Therefore, the present invention has been made in view of such problems, and an object of the present invention is to provide a feeding device capable of appropriately improving the separability.

  In order to solve the above problems, a medium feeding device according to a first aspect of the present invention includes a medium loading unit for loading a medium, a feeding roller for feeding the medium from the medium loading unit, and the feeding roller. And a belt unit including a separation belt for separating the medium by nipping the medium with the feeding roller.

  According to this aspect, the separation belt is used as the separation member, and the medium is separated by nipping the medium with the feeding roller by the separation belt. Therefore, the separation member is biased toward the feeding roller. The contact length between the medium and the separating member can be ensured without increasing the force more than necessary and without making the material of the separating member softer than necessary, and as a result, the effect of appropriately improving the separability can be obtained. be able to.

  According to a second aspect of the present invention, in the first aspect, the belt unit includes a first pulley that is given resistance to rotation and a second pulley that can freely rotate, and the separation belt includes the first pulley. It is characterized by being wound around one pulley and the second pulley.

  According to this aspect, since the separation belt is wound around the first pulley and the second pulley, the structure of the belt unit can be simplified and the cost can be reduced.

According to a third aspect of the present invention, in the second aspect, the first pulley is provided upstream in the medium feeding direction, and the second pulley is provided downstream in the medium feeding direction. To do.
According to this aspect, the first pulley with resistance to rotation is provided on the upstream side in the medium feeding direction, and the second pulley capable of free rotation is provided on the downstream side in the medium feeding direction. When the separation belt is moved, the separation belt is hardly slackened, and appropriate separation can be performed.

According to a fourth aspect of the present invention, in the second or third aspect, the contact position between the separation belt and the feeding roller is upstream of the medium feeding direction in the separation belt. .
According to this aspect, the contact position between the separation belt and the feeding roller is located upstream of the separation belt in the medium feeding direction, so that the medium enters the contact position between the separation belt and the feeding roller. In doing so, the separation belt is unlikely to get in the way, and non-feed can be suppressed.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, an urging unit that urges the belt unit against the feeding roller and an urging force of the urging unit are adjusted. And adjusting means.

  According to this aspect, since the urging means for urging the belt unit with respect to the feeding roller and the adjusting means for adjusting the urging force of the urging means are provided, by adjusting the urging force, Thus, the effect of improving the separability more appropriately can be obtained.

According to a sixth aspect of the present invention, in the fifth aspect, the control unit that controls the adjusting unit adjusts the urging force of the urging unit according to the type of the medium.
According to this aspect, the control unit that controls the adjusting unit adjusts the urging force of the urging unit according to the type of the medium. Therefore, by adjusting the urging force according to the type of the medium, The effect of improving separability can be obtained appropriately.

  According to a seventh aspect of the present invention, in the sixth aspect, when the control unit feeds an embossed medium, the control unit feeds an unembossed medium. The urging force is increased.

  Since the embossed medium has a convex portion formed on the surface of the medium, the convex portion is easily caught during separation and non-feeding tends to occur. However, according to this aspect, the control unit that controls the adjusting unit is configured to supply the embossed medium more frequently than the case where the embossed medium is fed. By increasing the force, the medium conveying force can be improved to the extent that it exceeds the frictional resistance of the hooked portion, and the occurrence of non-feed as described above can be suppressed.

According to an eighth aspect of the present invention, in any one of the second to fourth aspects, a tension adjusting unit that adjusts tensions of the first pulley and the separation belt is provided.
According to this aspect, since the tension adjusting means for adjusting the tension of the first pulley and the separation belt is provided, the effect of improving the separability more appropriately can be obtained by adjusting the tension.

  An image reading apparatus according to a ninth aspect of the present invention includes a reading unit that reads a medium, and a medium feeding device according to any one of the first to eighth aspects that feeds the medium toward the reading unit. , Provided.

  A recording apparatus according to a tenth aspect of the present invention is a medium feeding apparatus according to any one of the first to eighth aspects, wherein the recording means performs recording on a medium, and the medium is fed to the recording means side. And.

  According to the ninth aspect, in the image reading apparatus, and according to the tenth aspect, in the recording apparatus, it is possible to obtain the same operational effects as any of the first to eighth aspects described above. .

FIG. 3 is a side view showing a medium feeding path of the image reading apparatus according to the present invention. The schematic diagram explaining the biasing means which gives biasing force to the belt unit which concerns on this invention, and the adjustment means which adjusts the said biasing force. The schematic diagram explaining the tension adjustment means which adjusts the tension of the belt unit concerning the present invention. 1 is a schematic diagram of a recording apparatus including a belt unit according to the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the same structure in each Example, the same code | symbol is attached | subjected and it demonstrates only in the first Example, The description of the structure is abbreviate | omitted in a subsequent Example.

  FIG. 1 is a side view showing a medium feeding path of an image reading apparatus according to the present invention, and FIG. 2 is a biasing means for applying a biasing force to a belt unit according to the present invention, and an adjusting means for adjusting the biasing force. 3 is a schematic diagram illustrating tension adjusting means for adjusting the tension of the belt unit according to the present invention, and FIG. 4 is a schematic diagram of a recording apparatus including the belt unit according to the present invention. is there.

  In the XYZ coordinate system shown in each figure, the X direction is the apparatus width direction, the sheet width direction, the Y direction is the sheet conveyance direction in the image reading apparatus, and the Z direction is a direction orthogonal to the Y direction. A direction substantially perpendicular to the surface of the sheet to be conveyed is shown. In each figure, the −Y direction side is the front side of the apparatus, and the + Y direction side is the back side of the apparatus.

■■■ First Example ■■■■
<<< Overview of Image Reading Apparatus >>>
The image reading apparatus 10 will be described with reference to FIG. In this embodiment, the image reading apparatus 10 is configured as a document scanner that can read at least one of the front and back surfaces of a sheet P as a “medium”. In FIG. 1, a thick solid line with a reference symbol P indicates a guide path for paper conveyed along the medium feeding path 30 in the image reading apparatus 10.

  The image reading apparatus 10 includes a medium feeding device 14 provided in the apparatus main body 12, a conveying roller pair 16, an image reading unit 18 as “reading means”, and a discharge roller pair 20. Further, a discharge port 22 for discharging the paper P sent out from the discharge roller pair 20 is provided on the front side of the apparatus main body 12.

  In the present embodiment, the medium feeding device 14 includes a medium placement unit 24, a feeding roller 26, and a belt unit 28. The paper P placed on the medium placement unit 24 is nipped by the feed roller 26 and the belt unit 28 and fed along the medium feed path 30 downstream in the feed direction. In this embodiment, the feeding roller 26 is driven to rotate by a driving source (not shown). The belt unit 28 will be described later.

  The paper P that is nipped by the feed roller 26 and the belt unit 28 and sent downstream in the feed direction is nipped by the transport roller pair 16 and transported to the image reading unit 18 that is located downstream of the transport roller pair 16. Is done.

  The conveyance roller pair 16 includes a conveyance driving roller 16a and a conveyance driven roller 16b that rotates following the conveyance driving roller 16a. In the present embodiment, the transport drive roller 16a is driven to rotate by a drive source (not shown).

  Here, the image reading unit 18 includes an upper reading unit 32 provided so as to face the upper surface of the sheet P conveyed along the medium feeding path 30 and a sheet conveyed along the medium feeding path 30. And a lower reading unit 34 provided to face the lower surface of P. In the present embodiment, the upper reading unit 32 and the lower reading unit 34 are configured as reading units, and as an example, configured as a contact image sensor module (CISM).

  The sheet P is read by the image reading unit 18 at least one of the front and back surfaces of the sheet P, and then nipped by the discharge roller pair 20 positioned on the downstream side in the transport direction of the image reading unit 18. 22 is discharged.

  In this embodiment, the discharge roller pair 20 includes a discharge drive roller 20a and a discharge driven roller 20b that rotates following the discharge drive roller 20a. In the present embodiment, the discharge drive roller 20a is driven to rotate by a drive source (not shown). In addition, the conveyance drive roller 16a and the discharge drive roller 20a may be rotationally driven by a common drive source, or may be separately rotationally driven by separate drive sources.

  In the present embodiment, a control unit 36 is provided in the apparatus main body 12. In the present embodiment, the control unit 36 is configured as an electric circuit including a plurality of electronic components. The control unit 36 controls a driving source that rotationally drives the upper reading unit 32, the lower reading unit 34, the feeding roller 26, the transport driving roller 16a, and the discharge driving roller 20a.

  In this embodiment, the control unit 36 is configured to control the conveyance of the paper P and the image reading operation in the image reading apparatus 10. Further, the control unit 36 may control an operation necessary for executing the document reading operation in the image reading apparatus 10 by an instruction from the outside (PC or the like).

<< About the belt unit >>>>
The belt unit 28 according to this embodiment will be described with reference to FIGS. 2 and 3 in addition to FIG. The belt unit 28 includes a first pulley 38, a second pulley 40, and a separation belt 42 as a “separation member”. In the present embodiment, the first pulley 38 is provided on the upstream side in the feeding direction in the medium feeding path 30. The second pulley 40 is provided downstream in the feeding direction in the medium feeding path 30. The separation belt 42 is wound around the first pulley 38 and the second pulley 40.

  In the present embodiment, the first pulley 38 is provided with a torque limiter (not shown) as an example, and the torque limiter provides resistance to the rotation of the first pulley 38, that is, the movement of the separation belt 42. The resistance is given. In the present embodiment, the second pulley 40 is configured to be freely rotatable.

  Next, in this embodiment, the outer peripheral surface of the separation belt 42 wound around the first pulley 38 and the second pulley 40 is made of a high friction material (for example, an elastomer such as rubber). 2 and 3, in this embodiment, the contact position W1 of the separation belt 42 with the feeding roller 26 is closer to the first pulley 38 in the medium feeding direction, that is, upstream in the medium feeding direction. Is set to the side. Specifically, the separation belt 42 is in contact with the feeding roller 26 in the range of the contact length W along the feeding direction. In this embodiment, the contact position W1 is a position on the most upstream side in the feeding direction in the range of the contact length W between the separation belt 42 and the feeding roller 26.

  In this embodiment, since the first pulley 38 to which rotational resistance is applied is arranged upstream of the second pulley 40 that can freely rotate in the feeding direction, when the separation belt 42 is moved, It is possible to make it difficult for slack to occur.

  In this embodiment, the contact position W1 between the separation belt 42 and the feeding roller 26 is located upstream of the separation belt 42 in the medium feeding direction, so that the sheet P is fed to the separation belt 42 as shown in FIG. When entering the contact position W <b> 1 with the roller 26, the separation belt 42 is less likely to get in the way, and non-feed can be suppressed.

<<< About urging means and adjusting means >>>
Referring to FIG. 2, the medium feeding device 14 includes first biasing means 44 and adjusting means 46 as “biasing means” for biasing the belt unit 28 toward the feeding roller 26. As shown in FIG. 2, the rotation shaft 38 a of the first pulley 38 and the rotation shaft 40 a of the second pulley 40 are rotatably attached to the bearing member 48. One end of the first biasing means 44 is connected to the bearing member 48.

  The adjusting means 46 includes a first cam member 50 and a first cam contact member 52. The other end of the first urging means 44 is connected to the first cam contact member 52. In the present embodiment, the first biasing means 44 is configured as a compression spring as an example.

  In the present embodiment, the first cam member 50 is configured as a disc-shaped eccentric cam in which the radial distance from the rotation center to the outer peripheral surface 50a changes along the circumferential direction. In this embodiment, the outer peripheral surface 50a is configured as a cam surface.

  The first cam member 50 is rotationally driven by a drive motor 54 controlled by the control unit 36. The first cam contact member 52 that comes into contact with the outer peripheral surface (cam surface) 50a of the first cam member 50 by the rotational drive of the first cam member 50 is in a direction in which the first cam contact member 52 contacts or separates from the feed roller 26 (in FIG. 2). Advances and retracts in the Z-axis direction). Thereby, the length of the 1st biasing means 44 changes, and the biasing force of the 1st biasing means 44 is adjusted.

  In this embodiment, the urging force of the first urging means 44 acts on the rotating shaft 38 a of the first pulley 38 and the rotating shaft 40 a of the second pulley 40 via the bearing member 48. As a result, the separation belt 42 and thus the belt unit 28 are urged toward the feeding roller 26. Then, by adjusting the urging force of the first urging means 44, the urging force of the separation belt 42 to the feeding roller 26 can be adjusted.

  Here, the feeding of the paper P by the separation belt 42 will be described. In the present embodiment, when the separation belt 42 is in direct contact with the feeding roller 26, the rotational torque received from the feeding roller 26 exceeds the limit torque of the torque limiter of the first pulley 38. The separation belt 42 rotates following the feeding roller 26 (clockwise direction in FIGS. 1 to 3).

  Then, as shown in FIG. 2, when the feeding of the sheet P is started from the medium placement unit 24 and a plurality of documents enter between the feeding roller 26 and the separation belt 42, the separation belt 42 and, consequently, the first pulley. 38 no longer receives rotational torque from the feed roller 26, and rotation following the feed roller 26 stops. As a result, the upper document excluding the lowest document to be fed (the document that should be prevented from being double-fed) is not subjected to the conveyance force for proceeding to the downstream side, and its leading end is in contact with the separation belt 42 It cannot proceed downstream in the feeding direction. As a result, double feeding of documents is prevented. Since the lowest document to be fed is in direct contact with the feeding roller 26, the lowermost document advances downstream by the conveyance force received from the feeding roller 26.

  In this embodiment, since the separation belt 42 is urged toward the feeding roller 26 by the first urging means 44, the contact length W of the separation belt 42 with respect to the feeding roller 26 is increased. That is, the grip area for gripping the paper P can be increased. As a result, the separation property of the paper P can be improved, and the double feeding of the paper P can be prevented or suppressed.

  Further, in this embodiment, the separation member is configured as the separation belt 42, so that the urging force for urging the separation belt 42 toward the feeding roller 26 is not increased more than necessary, and the material of the separation belt 42 is changed. Without making it softer than necessary, the contact length W of the separation belt 42 with respect to the feeding roller 26 can be increased, and the grip area for gripping the paper P can be increased.

  In this embodiment, the control unit 36 rotates the drive motor 54 before feeding the paper P based on the type of the paper P previously input by the user to the image reading apparatus 10 or input from an external device. The urging force of the first urging means 44 is adjusted by the first cam member 50, that is, the adjusting means 46 by being driven. Accordingly, the separation belt 42 is urged against the feeding roller 26 with an appropriate urging force with respect to the input type of paper P, so that the separability with respect to the input type of paper P can be improved.

Specifically, for example, in the case of a sheet having a large coefficient of friction between sheets (for example, a dedicated sheet having a coat layer) that is likely to cause double feeding, the urging force of the first urging unit 44 is increased, In the case of thin paper that is easily generated, the urging force of the first urging means 44 is weakened.
More specifically, the type of the paper P can be classified by the paper thickness, and the paper thickness can be detected by a detection unit such as an ultrasonic sensor.

  Further, when the type of the input paper P is an embossed paper, the control unit 36 increases the urging force of the separation belt 42 against the feeding roller 26 as compared to a paper that has not been embossed. In addition, the drive motor 54 and, consequently, the adjusting means 46 are controlled.

  As a result, in the embossed paper P having a convex portion formed on the surface of the paper, even if the convex portion is caught by the feeding roller 26 or the separation belt 42 during separation, the conveyance force is improved to the extent that it exceeds the frictional resistance of the catching portion. It is possible to prevent or suppress non-feeding.

■■■ Second Example ■■■■
<<< About tension adjusting means >>>
Next, a second embodiment of the image reading apparatus 10 will be described with reference to FIG. In the present embodiment, the medium feeding device 14 includes a tension adjusting unit 56. The tension adjusting unit 56 includes a second cam member 58, a second cam contact member 60, and a second urging unit 62. In the present embodiment, one end of the second urging means 62 is connected to the rotation shaft 38 a of the first pulley 38. In the present embodiment, the second biasing means 62 is configured as a tension spring as an example.

  In the present embodiment, the second cam member 58 is configured as a disc-shaped eccentric cam in which the radial distance from the rotation center to the outer peripheral surface 58a varies along the circumferential direction. In this embodiment, the outer peripheral surface 58a is configured as a cam surface. The second cam member 58 is rotationally driven by a drive motor 64 controlled by the control unit 36.

  The second cam contact member 60 is provided with a swing shaft 60a. The second cam contact member 60 is configured to be swingable about the swing shaft 60a. The other end of the second urging means 62 is connected to one end of the second cam contact member 60. Further, the other end of the second cam contact member 60 opposite to one end of the swing shaft 60 a is in contact with the outer peripheral surface (cam surface) 58 a of the second cam member 58. Note that the other end of the second cam contact member 60 is biased toward the second cam member 58 by the biasing force of the second biasing means 62.

  When the second cam member 58 is rotationally driven by the drive motor 64, the second cam contact member 60 swings about the swing shaft 60a. Then, when one end of the second cam contact member 60 swings away from the first pulley 38 against the urging force of the second urging means 62, the other end of the second urging means 62 becomes the second. It is pulled by the cam contact member 60. Thereby, the urging force of the second urging means 62 is increased.

  On the other hand, when one end of the second cam contact member 60 swings in a direction approaching the first pulley 38, the urging force of the second urging means 62 that urges the first pulley 38 decreases. That is, when the second cam member 58 is rotationally driven to swing the second cam contact member 60, the length of the second urging means 62 in the Y-axis direction changes, and the second urging means 62 The biasing force is adjusted.

  Further, in the present embodiment, the rotation shaft 38a of the first pulley 38 is biased to the upstream side in the feeding direction by the second biasing means 62. When one end of the second cam contact member 60 is swung in a direction away from the first pulley 38 and the other end of the second urging means 62 is pulled by the second cam contact member 60, the separation belt 42 tension increases.

  On the other hand, when one end of the second cam contact member 60 is swung in a direction approaching the first pulley 38, the urging force of the second urging means 62 that urges the first pulley 38 decreases. As a result, the tension of the separation belt 42 is reduced. That is, the tension of the first pulley 38 and the separation belt 42 can be adjusted by adjusting the biasing force of the second biasing means 62.

<<<< Modification Example in Each Example >>>>
(1) In each of the above embodiments, the first pulley 38 of the belt unit 28 is provided with a torque limiter, but instead of this configuration, the first pulley 38 is fed by a drive source controlled by the controller 36 The roller 26 may be rotated in the direction opposite to the rotation direction (counterclockwise direction in FIGS. 1 to 3) (counterclockwise direction in FIGS. 1 to 3).
(2) Although the first pulley 38 is provided with a torque limiter in each of the above-described embodiments, the second pulley 40 may be provided with a torque limiter instead of this configuration.
(3) In the first embodiment, the urging force of the first urging means 44 is adjusted by the first cam member 50. It may be configured by a cylinder member or a solenoid that expands and contracts.
(4) In the second embodiment, the urging force of the second urging means 62 is adjusted by the second cam member 58, but instead of this structure, the second urging means 62 is along the axial direction. It may be configured by a cylinder member or a solenoid that expands and contracts.
(5) The medium feeding device 14 is applied to the image reading device 10 in each of the above embodiments. Instead of this configuration, the medium feeding device is added to a printer 70 as an example of a recording device as shown in FIG. 14 may be applied. Specifically, the printer 70 is movable in the apparatus width direction (direction intersecting the paper surface in FIG. 4) and the recording head 66 that performs recording by discharging ink toward the paper P, and the recording head is disposed below the recording head 66. And a carriage 68 provided with 66. Then, the paper P may be fed from the medium placement unit 24 to the area facing the recording head 66 by the medium feeding device 14.

  Summarizing the above description, the medium feeding device 14 includes a medium loading unit 24 on which a sheet is loaded, a feeding roller 26 that feeds the sheet P from the medium loading unit 24, and a sheet between the feeding roller 26. A belt unit including a separation belt 42 for separating the paper P by nipping the paper P.

  According to the above configuration, the separation belt 42 is used as the separation member, and the separation sheet 42 is separated by nipping the separation sheet 42 between the separation roller 42 and the feeding roller 26. The contact length W between the paper P and the separation belt 42 can be ensured without increasing the urging force urging toward the image more than necessary and without softening the material of the separation belt 42 more than necessary. As a result, the effect which improves a separability appropriately can be acquired.

  The belt unit 28 includes a first pulley 38 that is given resistance to rotation and a second pulley 40 that can freely rotate. A separation belt 42 is wound around the first pulley 38 and the second pulley 40. Yes. According to this configuration, since the separation belt 42 is wound around the first pulley 38 and the second pulley 40, the belt unit 28 can be configured simply and at low cost.

  The first pulley 38 is provided on the upstream side in the medium feeding direction, and the second pulley 40 is provided on the downstream side in the medium feeding direction. According to this configuration, when the paper P moves the separation belt 42, the separation belt 42 is hardly slackened, and appropriate separation can be performed.

  The contact position W <b> 1 between the separation belt 42 and the feeding roller 26 is upstream of the separation belt 42 in the medium feeding direction. According to this configuration, when the paper P enters the contact position between the separation belt 42 and the feeding roller 26, the separation belt 42 is unlikely to get in the way, and non-feed can be suppressed.

  First urging means 44 for urging the belt unit 28 against the feeding roller 26 and adjustment means 46 for adjusting the urging force of the first urging means 44 are provided. According to this structure, the effect which improves separability more appropriately can be acquired by adjusting biasing force.

  The control unit 36 that controls the adjusting unit 46 adjusts the urging force of the first urging unit 44 according to the type of paper. According to this configuration, by adjusting the urging force according to the type of the paper P, it is possible to obtain an effect of improving the separability more appropriately.

  When feeding the paper P that has been embossed, the control unit 36 reduces the biasing force of the first biasing means 44 compared to feeding the paper that has not been embossed.

  The embossed paper P has a convex portion formed on the surface of the paper P. Therefore, the convex portion is easily caught during separation, and non-feeding tends to occur. However, according to the above configuration, the control unit 36 that controls the adjusting unit 46 feeds the paper P that has been embossed, as compared to feeding the paper P that has not been embossed. Since the urging force of the first urging means 44 is increased, the conveying force can be improved to the extent that it exceeds the frictional resistance of the hooked portion, and the occurrence of non-feed as described above can be suppressed.

  A tension adjusting means 56 for adjusting the tension of the first pulley 38 and the separation belt 42 is provided. According to this configuration, it is possible to obtain an effect of improving the separation more appropriately by adjusting the tension.

  The image reading device 10 includes an image reading unit 18 that reads a medium, and a medium feeding device 14 that feeds the paper P to the image reading unit 18 side.

  The printer 70 includes a recording head 66 that records on the paper P, and a medium feeding device 14 that feeds the paper P to the recording head 66 side.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

DESCRIPTION OF SYMBOLS 10 ... Image reading apparatus, 12 ... Apparatus main body, 14 ... Medium feeding apparatus, 16 ... Conveyance roller pair, 16a ... Conveyance drive roller, 16b ... Conveyance driven roller, 18 ... Image reading part, 20 ... Discharge roller pair, 20a ... Discharge drive roller, 20b ... discharge driven roller, 22 ... discharge port, 24 ... medium placement unit, 26 ... feed roller, 28 ... belt unit, 30 ... medium feed path, 32 ... upper reading unit, 34 ... lower reading Unit: 36 ... control unit 38 ... first pulley 38a, 40a ... rotating shaft 40 ... second pulley 42 ... separation belt 44 ... first biasing means 46 ... adjusting means 48 ... bearing member 50 ... 1st cam member, 50a, 58a ... Outer peripheral surface (cam surface), 52 ... 1st cam contact member, 54, 64 ... Drive motor, 56 ... Tension adjusting means, 58 ... 2nd cam part , 60 ... second cam contact member, 60a ... pivot shaft, 62 ... second biasing means, 66 ... recording head, 68 ... carriage, 70 ... printer, P ... paper, W ... contact length, W1 ... contact position

Claims (10)

A medium placement unit for placing a medium;
A feeding roller for feeding out the medium from the medium mounting section;
A belt unit including a separation belt for separating the medium by nipping the medium with the feeding roller;
A medium feeding device comprising: The medium feeding device according to claim 1, wherein the belt unit includes a first pulley that is given resistance to rotation, and a second pulley that can freely rotate.
The separation belt is wound around the first pulley and the second pulley;
A medium feeding device. The medium feeding device according to claim 2, wherein the first pulley is provided on the upstream side in the medium feeding direction, and the second pulley is provided on the downstream side in the medium feeding direction.
A medium feeding device. The medium feeding device according to claim 2 or 3, wherein a contact position between the separation belt and the feeding roller is closer to the upstream side in the medium feeding direction in the separation belt.
A medium feeding device. The medium feeding device according to any one of claims 1 to 4, wherein a biasing unit that biases the belt unit against the feeding roller;
Adjusting means for adjusting the biasing force of the biasing means;
A medium feeding device comprising: 6. The medium feeding apparatus according to claim 5, wherein the control unit that controls the adjusting unit adjusts the biasing force of the biasing unit according to a type of the medium.
A medium feeding device. 7. The medium feeding apparatus according to claim 6, wherein the controller is configured to feed the medium that has been embossed as compared with the case of feeding the medium that has not been embossed. To increase the power,
A medium feeding device. The medium feeding device according to any one of claims 2 to 4, further comprising a tension adjusting unit that adjusts tensions of the first pulley and the separation belt.
A medium feeding device. Reading means for reading the medium;
The medium feeding device according to any one of claims 1 to 8, wherein the medium is fed to the side of the reading unit.
An image reading apparatus comprising: Recording means for recording on a medium;
The medium feeding device according to any one of claims 1 to 8, wherein the medium is fed toward the recording unit.
Recording device.

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