Medium conveying apparatus and image reading apparatus

Abstract

The invention provides a medium conveying device and an image reading device, which can simply remove a conveying roller (6) from a device main body (2) so as to replace the conveying roller (6), and can simply mount the conveying roller (6). A medium transport device (11) is provided with: a transport roller unit (12) including transport rollers (6) capable of transporting a medium; and a drive unit (13) that drives the transport roller (6), the drive unit (13) having a power transmission section (14), the transport roller unit (12) having a power-transmitted section (15), the power transmission section (14) and the power-transmitted section (15) being in a connected state when the transport roller unit (12) moves toward the drive unit (13), and the power-transmitted section (14) and the power-transmitted section (15) being in a connected state when the transport roller unit (12) moves toward the drive unit (13), and the power-transmitted section (15) being in a connected state when the transport roller unit (12) moves away from the drive unit (13). The power transmission section (14) and the power-transmitted section (15) are in a non-connected state.

Description

Technical Field

[0001] The invention relates to a medium conveying device and an image reading device. Background Art

[0002] As an example of such a device, there is a device described in Patent Document 1. Patent Document 1 discloses an image reading device having a document conveying mechanism, the document conveying mechanism including a document conveying mechanism such as a first conveying roller, a second conveying roller, and a feed roller, and a driving mechanism such as a motor, a pulley, and a transmission belt for driving the document conveying mechanism.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 5-83491

[0004] In the device of Patent Document 1, for example, when only the first conveying roller is replaced, the pulley and the transmission belt need to be removed. Therefore, after the first conveying roller is replaced, the tension of the transmission belt needs to be adjusted. The tension adjustment requires effort and is time-consuming. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the medium conveying device involved in the present invention is characterized in that it comprises: a conveying roller unit, including a conveying roller capable of conveying a medium; and a driving unit, driving the conveying roller, the driving unit having a power transmission part, and the conveying roller unit having a power transmitted part, when the conveying roller unit moves in a direction close to the driving unit, the power transmission part and the power transmitted part are in a connected state, and when the conveying roller unit moves in a direction away from the driving unit, the power transmission part and the power transmitted part are in a non-connected state.

[0006] Furthermore, an image reading device according to the present invention includes the medium conveying device according to any one of the first to seventh aspects described below and a reading unit that reads an image on the medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a perspective view of the appearance of the image reading device according to the first embodiment.

[0008] Figure 2 It is a perspective view of the image reading device of this embodiment with the side cover removed.

[0009] Figure 3 is from Figure 2 A perspective view showing a state in which the conveying roller unit is pulled out.

[0010] Figure 4 It is an overall perspective view of the transport roller unit according to this embodiment.

[0011] Figure 5 It is a main part perspective view showing the driving unit part according to this embodiment.

[0012] Figure 6 This is a front view of a state where the transport roller unit starts to be inserted in this embodiment.

[0013] Figure 7 The conveyor roller unit is Figure 6 The state is further moved to the main view of the state.

[0014] Figure 8 is from Figure 7 The state is a front view of a state in which the movement of the conveying roller unit is completed.

[0015] Fig. 9 It is a perspective view showing a modified example of the fixing structure for fixing the second support portion to the second frame.

[0016] Fig.10 This is a perspective view of a structure in which a handle is provided on the second support portion.

[0017] Description of Reference Numerals

[0018] 1: Image reading device, 2: Device body, 3: Conveying path, 4: Reading unit, 5: Reversing unit, 6: Conveying roller, 7: First shaft, 8: Side cover, 9: Medium loading unit, 10: Discharge receiving unit, 11: Medium conveying device, 12: Conveying roller unit, 13: Driving unit, 14: Power transmission unit, 15: Power transmitted unit, 16: First frame, 17: Second frame, 18: Insertion unit, 20: First gear, 21: Second gear, 22: First gear, 23: Second gear , 25: inclined surface, 26: toothed belt, 27: pulley, 28: second shaft, 30: support portion, 301: first support portion, 302: second support portion, 303: base support portion, 31: guide portion, 32: bearing, 33: bearing, 34: conductive member, 35: guide inclined surface, 36: screw, 37: screw, 38: C-shaped ring, 39: handle, 40: movable locking portion, 41: shaft, 42: locking recess, 43: convex portion, 45: driven roller, F: conveying direction DETAILED DESCRIPTION

[0019] Hereinafter, the present invention will first be briefly described.

[0020] In order to solve the above-mentioned technical problems, the first aspect of the medium conveying device involved in the present invention is characterized in that it comprises: a conveying roller unit, including a conveying roller capable of conveying a medium; and a driving unit, driving the conveying roller, the driving unit having a power transmission part, and the conveying roller unit having a power transmitted part, when the conveying roller unit moves in a direction close to the driving unit, the power transmission part and the power transmitted part are in a connected state, and when the conveying roller unit moves in a direction away from the driving unit, the power transmission part and the power transmitted part are in a non-connected state.

[0021] According to this aspect, the power transmission part and the power transmitted part are connected by the conveying roller unit moving in a direction close to the driving unit, and conversely, the power transmission part and the power transmitted part are disconnected by moving in a direction away from the driving unit. Thus, when the conveying roller is to be removed for replacement or the like, the conveying roller unit is simply moved in a direction away from the driving unit to be in the disconnected state, so that it can be easily removed. In addition, when the conveying roller unit including other conveying rollers is newly installed, the conveying roller unit is simply moved in a direction close to the driving unit to be in the connected state, so that it can be easily installed.

[0022] In other words, the conveying roller unit can be removed and installed by simply moving the conveying roller unit without operating the driving unit, so that the conveying roller can be easily replaced. In addition, there is no need to adjust the tension of the driving unit as in the past, which can shorten the replacement time.

[0023] The second aspect of the medium conveying device involved in the present invention is an aspect subordinate to the first aspect, and is characterized in that the medium conveying device comprises: a first frame; and a second frame, which is opposite to the first frame, the conveying roller unit has a first axis supporting the conveying roller, the first frame is located on one end side of the first axis, and the second frame is located on the other end side of the first axis, the driving unit is held by the first frame, and the conveying roller unit moves in the direction of the first axis by passing through the insertion portion of the second frame, thereby being able to adopt the connected state and the non-connected state.

[0024] According to this aspect, the conveyor roller unit can take the connected state and the disconnected state by moving in the direction along the first axis through the insertion portion of the second frame. Thus, the conveyor roller can be replaced with a simple structure.

[0025] A third aspect of the medium conveying device according to the present invention is an aspect subordinate to the second aspect, and is characterized in that the power transmitted portion located at one end of the first shaft is a first gear, and the power transmitting portion is a second gear meshing with the first gear.

[0026] According to this aspect, the power transmission part and the power transmission part are both constituted by gears. Thus, the structure for realizing the connected state and the non-connected state is simple, and the operation of switching between these states is easy.

[0027] The fourth aspect of the medium conveying device involved in the present invention is an aspect subordinate to the third aspect, and is characterized in that an inclined surface that enlarges the interval between adjacent teeth is formed at a position where at least one of the first gear and the second gear begins to mesh with the multiple first teeth of the first gear and the multiple second teeth of the second gear when moving in the approaching direction.

[0028] According to this aspect, at least one of the first gear and the second gear has an inclined surface that increases the interval between adjacent teeth at a position where the first gear and the second gear start to mesh with each other when moving in the approaching direction. The inclined surface facilitates the conveying roller unit to move toward the driving unit to achieve the connected state.

[0029] The fifth aspect of the medium conveying device involved in the present invention is an aspect subordinate to the third aspect, and is characterized in that the driving unit has: a toothed belt; and a rotating pulley, the toothed belt is hung around the pulley, and the second gear is installed on a second axis which serves as the rotation center of the pulley and rotates integrally with the pulley.

[0030] It should be noted that this aspect can also be subordinate to the fourth aspect.

[0031] In the medium transport device, some of the driving units include a toothed belt and the pulley. Conventionally, when replacing a transport roller, it is necessary to remove the toothed belt from the pulley.

[0032] However, according to this aspect, the second gear is mounted on the second shaft that is the rotation center of the pulley and rotates integrally with the pulley. Therefore, the connection state can be changed to the non-connection state by moving the conveying roller unit in a direction away from the driving unit. As a result, the conveying roller unit can be easily removed from the driving unit, so that the conveying roller can be easily replaced.

[0033] The sixth aspect of the medium conveying device according to the present invention is an aspect subordinate to the second aspect, and is characterized in that the conveying roller unit includes a supporting portion that supports the first axis so as to be rotatable, and includes a guiding portion between the first frame and the second frame, and when the movement is performed, the guiding portion guides the supporting portion.

[0034] It should be noted that this aspect may also belong to any one of the third to fifth aspects.

[0035] According to this aspect, when the conveying roller unit is moved from the second frame side toward the first frame, the support portion is guided along the guide portion. Thus, the conveying roller unit can be easily moved.

[0036] The seventh aspect of the medium conveying device involved in the present invention is an aspect subordinate to the sixth aspect, characterized in that the supporting part is conductive and has: a first supporting part, located on one end side of the first shaft and supporting the first shaft via a bearing; a second supporting part, located on the other end side of the first shaft and supporting the first shaft via a bearing; and a base supporting part, connecting the first supporting part with the second supporting part, and the first shaft and the supporting part are connected via a conductive component.

[0037] As the bearing is used continuously, the properties of the lubricating oil inside the bearing deteriorate and the conductivity decreases. Therefore, in the structure in which the first shaft is grounded via the bearing, the grounding properties may also be degraded.

[0038] However, according to this aspect, the first shaft and the conductive support portion are connected via a conductive member such as brass. Thus, even if the grounding property of the bearing is degraded, the first shaft can continue to be grounded by the conductive member.

[0039] An eighth aspect of the image reading device according to the present invention comprises the medium conveying device according to any one of the first to seventh aspects and a reading unit that reads an image on the medium.

[0040] According to this aspect, as the image reading device, the same effects as those of any one of the first to seventh aspects can be obtained.

[0041] Implementation

[0042] Hereinafter, embodiments of a medium transport device according to the present invention and an image reading device including the medium transport device will be described in detail based on the drawings.

[0043] In the following description, as shown in the figures, three mutually orthogonal axes are set as X-axis, Y-axis, and Z-axis respectively. The directions indicated by the arrows of the three axes (X, Y, Z) are the + directions of each direction, and the opposite directions are the - directions. The Z-axis direction is equivalent to the vertical direction, that is, the direction in which gravity acts, the +Z direction indicates the vertical top, and the -Z direction indicates the vertical bottom. The X-axis direction and the Y-axis direction are equivalent to the horizontal direction. The +Y direction indicates the front direction of the device, and the -Y direction indicates the rear direction of the device. The +X direction indicates the right direction of the device, and the -X direction indicates the left direction of the device.

[0044] Implementation Method 1

[0045] Image reading device

[0046] like Figures 1 to 4 As shown, the image reading device 1 of the present embodiment includes a medium transport device 11 and a reading unit 4 inside a device body 2 .

[0047] The medium transport device 11 includes a transport path 3 for transporting a medium such as paper (not shown) in a transport direction F. As described later, a plurality of transport rollers 6 are arranged in the transport path 3 along the transport direction F. The transport rollers 6 are connected by a first shaft 7 ( Figure 2 , Figure 3 , Figure 4 ) and rotates integrally with the first shaft 7. The conveying roller 6 applies a conveying force in the conveying direction F to the medium by rotating. Figure 2 In FIG. 1 , a portion of a first shaft 7 of one of the plurality of conveying rollers 6 is shown, and the other portions are omitted from illustration. Figure 2 This is a state where the side cover 8 on one side (−X side) of the image reading device 1 is removed.

[0048] The details of the structure of the medium transport device 11 will be described later.

[0049] like Figure 1 As shown, the reading unit 4 is arranged along the conveying path 3. The reading unit 4 optically reads an image of the medium conveyed in the conveying path 3 and acquires image information. In the present embodiment, the conveying path 3 includes a reversing unit 5.

[0050] The front side of the image reading device 1 is a medium loading section 9 for loading a medium. The medium loading section 9 is opened to the front (+Y direction) with the upper end as a rotation fulcrum and is located in a horizontal position, thereby being in an open state capable of loading a medium. Figure 1 In the embodiment, the medium loading section 9 is in a closed state.

[0051] The medium placed on the medium loading section 9 in the open state is picked up one by one by a pickup roller (not shown), transported along the transport direction F in the transport path 3, read by the reading section 4, and transported in the reversing section 5 to be discharged to the discharge receiving section 10 located at the upper part of the device body 2.

[0052] Medium conveying device

[0053] like Figure 4 and Figure 5 As shown, the medium conveying device 11 of this embodiment includes a conveying roller unit 12 including a conveying roller 6 and a driving unit 13 for driving the conveying roller 6. The driving unit 13 is driven by receiving a rotational power from a motor (not shown). The driving unit 13 includes a power transmission unit 14 for transmitting the rotational power to the conveying roller unit 12. The conveying roller unit 12 includes a power transmission unit 15 for receiving the transmission of the rotational power from the driving unit 13.

[0054] Then, the power transmission part 14 and the power transmission part 15 are connected by the conveying roller unit 12 moving in the direction (+X direction) approaching the driving unit 13. That is, the rotational power is transmitted from the driving unit 13 to the conveying roller unit 12 side. On the other hand, the power transmission part 14 and the power transmission part 15 are disconnected by the conveying roller unit 12 moving in the direction (-X direction) away from the driving unit 13. That is, the power transmission part 15 of the conveying roller unit 12 is located at a position away from the power transmission part 14 of the driving unit 13.

[0055] like Figure 2 As shown, in this embodiment, the medium conveying device 11 includes a plate-shaped first frame 16 located at one end side (+X side) of the first shaft 7 and a plate-shaped second frame 17 located at the other end side (-X side) of the first shaft 7. The first frame 16 is located inside a side cover (not shown) on the other side (+X side) of the image reading device 1. The driving unit 13 is held by the first frame 16. In other words, the driving unit 13 is mounted on the first frame 16.

[0056] like Figures 2 to 4 As shown, the conveying roller unit 12 has a first shaft 7 that supports the conveying roller 6. The conveying roller unit 12 is configured to pass through the insertion portion 18 ( Figure 2 ) and moves in the direction along the first axis 7 (X-axis direction), so that it can take the connected state and the non-connected state.

[0057] like Figure 5 As shown, in this embodiment, the power transmission part 15 located at one end (+X side) of the first shaft 7 is the first gear 20, and the power transmission part 14 is the second gear 21 meshing with the first gear 20. Figure 5 As shown in the partially enlarged view in FIG. 1 , the second gear 21 is formed with an inclined surface 25 that enlarges the interval between adjacent teeth 23 at the location where the plurality of first teeth 22 of the first gear 20 and the plurality of second teeth 23 of the second gear 21 begin to mesh when the conveying roller unit 12 moves in the approaching direction (+X direction).

[0058] It should be noted that the inclined surface 25 may be formed on the first gear 20 instead of the second gear 21 , or may be formed on both the first gear 20 and the second gear 21 .

[0059] like Figure 5 As shown in the figure, in this embodiment, the drive unit 13 includes a toothed belt 26 and a pulley 27. The toothed belt 26 is hung around the pulley 27, and the pulley 27 is rotated by rotating the toothed belt 26 by receiving a rotational power from a motor (not shown). Therefore, the second gear 21 is mounted on a second shaft 28 that is the rotation center of the pulley 27 and rotates integrally with the pulley 27.

[0060] like Figure 4 As shown, in the present embodiment, the conveying roller unit 12 has a support portion 30 that supports the first shaft 7 so as to be rotatable. The support portion 30 is made of a conductive material such as a metal plate. The support portion 30 has: a first support portion 301, which is located on one end side (+X side) of the first shaft 7 and supports the first shaft 7 via a bearing 32; a second support portion 302, which is located on the other end side (-X side) of the first shaft 7 and supports the first shaft 7 via a bearing 33; and a base support portion 303 that connects the first support portion 301 and the second support portion 302. Figure 2 In the figure, reference numeral 38 is a C-shaped ring.

[0061] In this embodiment, the first shaft 7 and the support portion 30 are connected via a conductive member 34. Here, the conductive member 34 is made of a material having good conductivity such as brass.

[0062] like Figures 6 to 8 As shown, the medium conveying device 11 includes a guide portion 31 between the first frame 16 and the second frame 17, and the guide portion 31 guides the support portion 30 when the conveying roller unit 12 moves in the X-axis direction. Here, the base support portion 303 of the support portion 30 is guided by the guide portion 31. Here, the guide portion 31 is formed in a rib shape. It is configured to be guided to move in the X-axis direction in a state where the lower surface of the base support portion 303 is in contact with the upper surface of the rib-shaped guide portion 31.

[0063] In the present embodiment, the rib-shaped guide portion 31 is at the same height from the second frame 17 side to the front of the first frame 16, but a rising guide inclined surface 35 is formed in the area from the position in front of the first frame 16 toward the second gear 21 of the drive unit 13. The guide inclined surface 35 plays a role in making it easy to reach a state where the first gear 20 and the second gear 21 are meshed with each other, that is, the connected state, by approaching obliquely from the bottom to the top when the first gear 20 and the second gear 21 are connected. In addition, the guide inclined surface 35 also plays a role in making the lower surface of the base support portion 303 separate from the upper surface of the rib-shaped guide portion 31 in the connected state.

[0064] In the above-mentioned connection state of the first gear 20 and the second gear 21, as described above, the lower surface of the base support portion 303 is in a state separated from the upper surface of the rib-shaped guide portion 31. Figure 2 As shown in the partially enlarged view of FIG. 1 , in the conveying roller unit 12, in the separated state, the second support portion 302 of the support portion 30 is fastened to the second frame 17 by screws 36 and 37. The conveying roller unit 12 is configured to be fixed to a position where the conveying roller 6 can impart a conveying force to the medium in the fastened state.

[0065] The second frame 17 is provided with a positioning portion (not shown) for positioning so as to be fixed at the position. The conveying roller unit 12 is fixed by screws 36 and 37 in the above-mentioned positioning state. Figure 2 Although hidden and invisible in the partially enlarged view, holes for inserting screws 36 and 37 are formed in the second frame 17.

[0066] Fig. 9 This is a modified example of the fixing structure for fixing the second support portion 302 to the second frame 17. In this modified example, the screws 36 and 37 are not used, and the movable locking portion 40 is mounted on the second frame 17 in a manner that the movable locking portion 40 rotates with the shaft 41 as a rotation fulcrum. The shaft 41 is mounted on the second frame 17. The movable locking portion 40 is formed with a concave locking recess 42 on the side opposite to the shaft 41.

[0067] In addition, if Fig. 9 As shown in FIG. 1 , the convex portion 43 is provided on the second frame 17. The convex portion 43 is formed into a shape that is locked with the locking recess 42. Fig. 9 When the state shown in the figure above is rotated in the direction of the arrow, it becomes Fig. 9 In the state shown in the figure below, the locking recess 42 of the movable locking portion 40 is locked with the convex portion 43, and in this state the second support portion 302 is fixed. It should be noted that the second support portion 302 is positioned and fixed in the Y-axis direction and the Z-axis direction by omitting the positioning portion shown in the figure.

[0068] Replacement of conveyor rollers

[0069] (1) Installation of new conveyor roller

[0070] First, based on Figures 6 to 8 , a case where a new conveying roller 6 is mounted on the device main body 2 will be described.

[0071] like Figure 6 As shown, in a state where the side cover 8 of the apparatus body 2 is removed, the transport roller unit 12 is aligned with the insertion portion 18 of the second frame 17 and starts to be inserted in the +X direction.

[0072] Then, if Figure 7 As shown, the transport roller unit 12 is moved so as to be pushed in while being guided in the +X direction in a state where the lower surface of the base support portion 303 of the support portion 30 is in contact with the rib-shaped guide portion 31 .

[0073] When the movement is further continued, the front end of the base support part 303 in the moving direction reaches the position of the guide inclined surface 35 of the guide part 31, and moves in the +X direction while tilting up along the guide inclined surface 35. At the end of the movement, the first gear 20 of the conveying roller unit 12 is meshed with the second gear 21 of the driving unit 13 to form the connection state. In this state, the second support part 302 is fastened to the second frame 17 by screws 36 and 37. This state is Figure 8 .

[0074] exist Figure 8 In the figure, reference numeral 45 is a driven roller. Figure 8 As shown, in the fastened state, the conveying rollers 6, 6 and the driven rollers 45, 45 are in contact with each other. In this state, the conveying rollers 6, 6 rotate, and the driven rollers 45, 45 rotate as a result, thereby applying conveying force to the medium.

[0075] (2) Disassembly of conveyor roller

[0076] like Figure 2 As shown, first, the side cover 8 is removed from the apparatus body 2. Next, the screws 36 and 37 are removed from the second support portion 302. Thus, the transport roller unit 12 is in a state where it can be pulled out in the -X direction.

[0077] Then, if Figure 3 The bottom surface of the base support portion 303 of the support portion 30 moves downwardly on the guide inclined surface 35, contacts the top surface of the guide portion 31, moves in the -X direction, and is finally completely pulled out from the device body 2.

[0078] Description of the Effects of Embodiment 1

[0079] (1) In the medium conveying device 11 of the present embodiment, the power transmission part 14 and the power transmitted part 15 are connected by the conveying roller unit 12 moving toward the driving unit 13, and conversely, the power transmission part 14 and the power transmitted part 15 are disconnected by moving away from the driving unit 13. Thus, when the conveying roller 6 is to be removed for replacement or the like, the non-connected state can be achieved simply by moving the conveying roller unit 12 away from the driving unit 13, so that the conveying roller 6 can be easily removed. In addition, when a conveying roller unit 12 including another conveying roller 6 is newly installed, the connected state can be achieved simply by moving the conveying roller unit 12 toward the driving unit 13, so that the conveying roller unit can be easily installed.

[0080] In other words, the conveying roller 6 can be easily replaced by moving the conveying roller unit 12 without operating the driving unit 13, thereby easily replacing the conveying roller 6. In addition, the tension adjustment of the driving unit 13 as in the past is not required, and the replacement time can be shortened.

[0081] (2) In the present embodiment, the transport roller unit 12 can take the connected state and the disconnected state by moving in the direction along the first axis 7 through the insertion portion 18 of the second frame 17. Thus, the transport roller 6 can be replaced with a simple structure.

[0082] (3) In the present embodiment, both the power transmission unit 15 and the power transmission unit 14 are constituted by gears. This simplifies the structure for realizing the connection state and the non-connection state, and facilitates the operation of switching between these states.

[0083] (4) In addition, in the present embodiment, at least one of the first gear 20 and the second gear 21 is formed with an inclined surface 25 that increases the interval between adjacent teeth 23, 23, ... at a location where the first gear 20 and the second gear 21 move in the approaching direction and begin to mesh with each other. The inclined surface 25 makes it easier for the conveying roller unit 12 to move in the direction approaching the driving unit 13 and enter the connected state.

[0084] (5) In the medium transport device 11 , the drive unit 13 includes a structure including a toothed belt 26 and a pulley 27 . Conventionally, when replacing the transport roller 6 , it is necessary to remove the toothed belt 26 from the pulley 27 .

[0085] However, in the present embodiment, the second gear 21 is attached to the second shaft 28 which is the rotation center of the pulley 27 and rotates integrally with the pulley 27. Therefore, the connection state can be changed to the non-connection state by moving the conveying roller unit 12 in a direction away from the driving unit 13. Thus, the conveying roller unit 12 can be easily removed from the driving unit 13, and the conveying roller 6 can be easily replaced.

[0086] (6) In the present embodiment, when the transport roller unit 12 is moved from the second frame 17 side toward the first frame 16 , the support portion 30 is guided along the guide portion 31 . This makes it possible to easily move the transport roller unit 12 .

[0087] (7) The first shaft 7 is supported by the second support portion 302 via the bearing 33. As the bearing 33 is used continuously, the properties of the lubricating oil inside it deteriorate and the conductivity decreases. Therefore, in the structure in which the first shaft 7 is grounded via the bearing 33, the grounding properties may also be degraded.

[0088] However, in this embodiment, the first shaft 7 and the conductive support portion 30 are connected via a conductive member 34 such as brass. Thus, even if the grounding property of the bearing 33 is degraded, the first shaft 7 can continue to be grounded via the conductive member 34.

[0089] Other Implementations

[0090] The medium transport device 11 and the image reading device 1 having the medium transport device 11 according to the present invention basically have the configuration of the above-described embodiment, but it is of course possible to modify or omit some of the configurations without departing from the gist of the present invention.

[0091] like Fig.10 As shown, it is preferable to provide a handle 39 on the second support portion 302 of the driving roller unit 12. If the handle 39 is provided, the user can move the driving roller unit 12 by gripping the handle 39, so that the operability is improved.

[0092] Furthermore, in the above-described embodiment, the driving roller unit 12 is described as having a structure including the support portion 30 , but the support portion 30 may be omitted and the first shaft 7 may be directly moved in the X-axis direction.

Claims

1. A medium conveying device, characterized in that: have: a conveying roller unit including a conveying roller capable of conveying a medium; and a driving unit, driving the conveying roller, The driving unit has a power transmission part. The conveying roller unit includes a power transmission portion. When the conveying roller unit moves toward the driving unit, the power transmission unit and the power transmission unit are connected to each other. When the transport roller unit moves in a direction away from the driving unit, the power transmission unit and the power-transmitted unit are in a disconnected state.

2. The medium conveying device according to claim 1, characterized in that: The medium conveying device comprises: First Framework; and A second frame, opposite to the first frame, The conveying roller unit includes a first shaft supporting the conveying roller. The first frame is located at one end side of the first axis, The second frame is located at the other end side of the first axis, The driving unit is held by the first frame, The transport roller unit can take the connected state and the unconnected state by moving in the direction along the first axis through the insertion portion of the second frame.

3. The medium conveying device according to claim 2, characterized in that: The power transmission portion located at one end of the first shaft is a first gear. The power transmission portion is a second gear meshing with the first gear.

4. The medium conveying device according to claim 3, characterized in that: At least one of the first gear and the second gear has an inclined surface that increases the interval between adjacent teeth at a location where the plurality of first teeth of the first gear and the plurality of second teeth of the second gear begin to mesh with each other when the first gear moves in the approaching direction.

5. The medium conveying device according to claim 3, characterized in that: The driving unit comprises: Toothed belts; and a rotating pulley, the toothed belt being wound around the pulley, The second gear is attached to a second shaft serving as a rotation center of the pulley and rotates integrally with the pulley.

6. The medium conveying device according to claim 2, characterized in that: The transport roller unit includes a support portion that rotatably supports the first shaft. A guide portion is provided between the first frame and the second frame, and the guide portion guides the support portion during the movement.

7. The medium conveying device according to claim 6, characterized in that: The support portion is conductive and has: a first support portion, located on one end side of the first shaft and supporting the first shaft via a bearing; a second support portion, located on the other end side of the first shaft and supporting the first shaft via a bearing; as well as a base support portion, connecting the first support portion and the second support portion, The first shaft and the support portion are connected via a conductive member.

8. An image reading device, characterized in that: have: The medium conveying device according to any one of claims 1 to 7; and The reading unit reads the image on the medium.

Images