Detection device, medium conveyance device and mounting method

Abstract

To easily ensure space for mounting a detecting part to a frame while avoiding interference between the detecting part and the to-be-detected part.SOLUTION: A detection device includes: a detecting part 23 including a first portion 21 and a second portion 22 which are positioned facing each other with a to-be-detected part 20 in between, the detecting part being configured to detect the to-be-detected part; and a frame 14 to which the detecting part is mounted. The detecting part 23 can engage with the frame 14 by moving along a first direction F1 which intersects with a detection surface 24 of the to-be-detected part, and in the engaged state, the first portion and the second portion can be displaced between: a first position in which they overlap with the to-be-detected part when viewed in the first direction; and a second position in which the first portion and the second portion do not overlap with the to-be-detected part when viewed in the first direction.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a detection device, a media transport device and an installation method. [Background technology]

[0002] An example of this type of device is described in Patent Document 1. Patent Document 1 discloses that an angle detection sensor fixed to a positioning member is slid in a direction along the surface of the encoder wheel from the radial direction of the central axis 30, so that the encoder wheel is inserted and attached so as to be sandwiched in the U-shaped gap of the angle detection sensor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-295022 A Summary of the Invention [Problem to be solved by the invention]

[0004] To perform the assembly method described in Patent Document 1, space is required to slide the positioning member and the angle detection sensor in the attachment / detachment direction along the surface of the encoder wheel, which hinders miniaturization. The attachment direction may be restricted by various factors, such as the purpose of miniaturization, space restrictions, and restrictions on the orientation of the encoder wheel surface and the surface on which the encoder wheel is attached. [Means for solving the problem]

[0005] In order to solve the above problems, the detection device of the present invention has a detectable part, a first part and a second part that are opposed to each other and can be positioned on either side of the detectable part, a detection part that detects the detectable part, and a frame to which the detection part is attached, and the detection part is engageable with the frame by moving along a first direction that intersects with the detectable surface of the detectable part, and when engaged by movement along the first direction, the first part and the second part are displaceable between a first position in which they overlap the detectable part when viewed in the first direction, and a second position in which the first part and the second part do not overlap the detectable part when viewed in the first direction.

[0006] In addition, the medium transport device of the present invention is characterized by comprising a detection device described in the first aspect described below, a motor to which the detected part is attached, and a transport part that rotates by the power of the motor and transports the medium.

[0007] Furthermore, an installation method according to the present invention is an installation method for attaching a detection part, which has a first part and a second part that are opposed to each other and can be positioned on either side of a detectable part, to a frame along a first direction that intersects with a detectable surface of the detectable part, the installation method comprising: engaging an engaging part of the detection part with an engaged part of the frame in a position in which the first part and the second part do not overlap with the detectable part when viewed in the first direction; displacing the first part and the second part to a position in which they overlap with the detectable part when viewed in the first direction, when the engaging part and the engaged part are engaged; and regulating the displacement of the detection part with a regulating part of the detection part when the engaging part and the engaged part are engaged. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a schematic perspective view of the rear exterior of a recording apparatus having a medium conveying device according to the first embodiment. [Diagram 2] FIG. 2 is a schematic perspective view of the recording apparatus according to the first embodiment with a door portion open, as viewed from the front. [Diagram 3] FIG. 3 is an enlarged view of the main part of FIG. 2. [Figure 4] FIG. 2 is an enlarged view of the main part of FIG. 1. [Diagram 5] FIG. 2 is a perspective view of a holding portion according to the first embodiment. [Figure 6] FIG. 3 is a perspective view of a main part showing a method of attaching a detection unit to a frame according to the first embodiment. [Figure 7] FIG. 3 is a perspective view of a main part showing a method of attaching a detection unit to a frame according to the first embodiment. [Figure 8] FIG. 3 is a perspective view of a main part showing a method of attaching a detection unit to a frame according to the first embodiment. [Figure 9] FIG. 3 is a perspective view of a main part showing a method of attaching a detection unit to a frame according to the first embodiment. [Figure 10] FIG. 4 is a perspective view of a main part of the holding portion of the first embodiment, as viewed from the inner surface side of the frame. [Figure 11] FIG. 11 is a perspective view of a main portion of a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will first be briefly described below. In order to solve the above problems, a first aspect of the detection device of the present invention has a detectable part, a first part and a second part that are opposed to each other and can be positioned on either side of the detectable part, a detection part that detects the detectable part, and a frame to which the detection part is attached, wherein the detection part is engageable with the frame by moving along a first direction that intersects with a detectable surface of the detectable part, and when engaged by movement along the first direction, the first part and the second part are displaceable between a first position in which they overlap the detectable part when viewed in the first direction, and a second position in which the first part and the second part do not overlap the detectable part when viewed in the first direction.

[0010] According to this aspect, the detection unit can be engaged with the frame by moving along a first direction intersecting with the detection surface of the detection unit. This makes it easy to attach the detection unit by moving it along the first direction intersecting with the detection surface and fixing it to the frame, even when it is difficult to secure space for attachment in a direction along the detection surface or when it is necessary to attach it along the first direction due to factors such as the orientation of the frame. This in turn makes it possible to prevent the device from becoming larger. In addition, since the detected part is attached in a sandwiched manner between the first and second parts of the detection part, if the detection part is simply attached along a first direction intersecting with the detected surface, there is a risk that the first or second part will interfere with the detected part. However, in this aspect, the detection part is displaceable to a second position in which the first and second parts do not overlap with the detected part, so that the occurrence of the interference can be easily avoided.

[0011] A second aspect of the detection device of the present invention is an aspect dependent on the first aspect, wherein the frame has an engaged portion with which the detection portion can engage by movement along the first direction and a regulating portion that regulates displacement of the detection portion when the detection portion is engaged, the detection portion has an engaging portion with which the engagement portion can engage by movement along the first direction and a regulated portion that is regulated by the regulating portion when the engagement portion is engaged with the engaged portion, the first posture is a posture in which the engaging portion and the engaged portion are engaged and the regulating portion regulates the regulated portion, and the second posture is a posture in which the engaging portion and the engaged portion are engaged and the regulating portion does not regulate the regulated portion.

[0012] According to this aspect, the first posture is a posture in which the engaging portion of the detection portion and the engaged portion of the frame engage with each other and the restricting portion of the frame restricts the restricted portion of the detection portion, and the second posture is a posture in which the engaging portion and the engaged portion engage with each other and the restricting portion does not restrict the restricted portion. As a result, by engaging the engaging portion to set the second posture and then displacing the detection portion to the first posture to restrict displacement of the detection portion with the restricting portion, the detection portion can be easily attached to the frame while avoiding the interference.

[0013] A third aspect of the detection device of the present invention is an aspect dependent on the second aspect, and is characterized in that the detection portion has a holding portion in which the first portion, the second portion, the engagement portion and the regulated portion are provided, the regulated portion is provided on the holding portion via an extension portion, and the extension portion extends along the first direction relative to the holding portion when attached to the frame.

[0014] According to this aspect, when the detection unit is attached to the frame via the holding unit, the extension unit extends along the first direction relative to the holding unit, whereby the movement direction of the holding unit and the extension direction of the extension unit when engaging the detection unit with the frame are both the first direction and are the same, facilitating alignment when achieving the engagement.

[0015] A fourth aspect of the detection device of the present invention is an aspect dependent on the second aspect, characterized in that the displacement direction from the second posture to the first posture is a second direction along the frame, the detection unit has a holding portion in which the first portion, the second portion, the engagement portion and the regulated portion are provided, the regulated portion is provided on the holding portion via an extension portion, and the extension portion extends along the second direction relative to the holding portion when attached to the frame.

[0016] When the detection unit is moved in the first direction to engage, and then rotated in the second direction in that engaged state to change from the second position to the first position, a large force may inadvertently act in the second direction. According to this aspect, when the detection unit is attached to the frame via the holding unit, the extension unit extends in a second direction along the frame relative to the holding unit. As a result, even if a large force acts in the second direction, the direction of the force is the same as the extension direction of the extension unit, so that the regulated unit has increased strength against the force applied in the second direction, and the risk of deformation can be reduced.

[0017] A fifth aspect of the detection device of the present invention is an aspect dependent on the fourth aspect, and is characterized in that the retaining portion is fastened to the frame with a screw, and the rotation direction of the screw is along the second direction.

[0018] According to this aspect, the rotation direction of the screw is along the second direction, and therefore the extension portion of the regulated portion extends in the rotation direction of the screw, i.e., in both the fastening and loosening of the screw, so that the strength of the regulated portion against stress and deformation applied to the regulated portion by the rotation of the screw when fastening the screw is increased, thereby making it possible to suppress the deformation.

[0019] A sixth aspect of the detection device according to the present invention is an aspect dependent on the second aspect, and is characterized in that the engagement portion and the regulated portion are respectively provided on opposing surfaces of the holding portion. This aspect may be subordinate to any one of the third to fifth aspects.

[0020] According to this aspect, the engaging portion and the regulated portion are provided on opposing surfaces of the holding portion, respectively, which makes it possible to separate the positions of the engaging portion and the regulated portion, thereby making it possible to suppress misalignment of the engaging portions.

[0021] A seventh aspect of the detection device of the present invention is an aspect dependent on the sixth aspect, and is characterized in that the opposing surfaces are surfaces that intersect with a plane on which the first part and the second part are provided.

[0022] Since the detected portion is located on the side where the first and second portions protrude, a motor or the like whose rotation is to be detected may be disposed on that side. In this case, if the engaging portion or the regulated portion is provided on the side where the first and second portions protrude, there is a risk of interference with the motor or the like. However, according to this aspect, the mutually opposing surfaces are surfaces that intersect with the surface on which the first portion and the second portion are provided, and therefore interference with the motor and the like can be suppressed.

[0023] An eighth aspect of the detection device of the present invention is an aspect dependent on the second aspect, and is characterized in that the frame is formed with a through portion into which the regulated portion can be inserted when the detection portion moves in the first direction to reach the second posture. This aspect may be subordinate to any one of the third to seventh aspects.

[0024] According to this aspect, the frame is formed with a through-hole into which the regulated portion can be inserted when the detection portion moves in the first direction to reach the second position. This allows the regulated portion to be inserted into the through-hole of the frame and then the detection portion to be displaced in a direction along the frame, thereby easily transitioning from the second position to the first position. This allows the detection portion to be easily attached to the frame.

[0025] A ninth aspect of the detection device of the present invention is an aspect dependent on the eighth aspect, and is characterized in that the regulated portion has a locking claw that engages with the back surface of the frame in the direction of insertion when inserted into the through portion.

[0026] When the holding portion is attached to the frame and assumes the first position, if the regulated portion is located above the engaging portion, the weight of the holding portion may cause the regulated portion to rotate about the engaging portion as a fulcrum in a direction in which it comes out of the regulating portion, in other words, in a direction intersecting with the plane formed by the frame, which may result in the regulated portion falling or becoming displaced. However, according to this aspect, the locking claw can reduce this risk.

[0027] A tenth aspect of the detection device according to the present invention is an aspect dependent on the second aspect, and is characterized in that the direction of displacement from the second posture to the first posture is a direction of rotation around the engagement portion. This aspect may be subordinate to any one of the third to ninth aspects.

[0028] According to this aspect, the detection unit is moved in the first direction to engage the engagement portion with the engaged portion of the frame to assume the second position, and then rotated around the position of the engagement portion to displace the detection unit from the second position to the first position. This simplifies the operation of attaching the detection unit to the frame. Furthermore, by displacing the detection unit by the rotation, the space required for the attachment operation can be reduced.

[0029] An eleventh aspect of the detection device according to the present invention is an aspect dependent on the tenth aspect, and is characterized in that a rotation angle from the second attitude to the first attitude is an acute angle.

[0030] According to this aspect, the rotation angle from the second position to the first position is an acute angle, so that the space required for mounting the holding portion can be reduced.

[0031] A twelfth aspect of the detection device of the present invention is an aspect dependent on the eighth aspect, characterized in that the direction of displacement from the second posture to the first posture is a direction of rotation around the engagement portion, the through portion has a locking protrusion that stops the regulated portion from moving in the direction of transitioning from the first posture position to the second posture position, and the regulated portion is elastically deformable in a direction intersecting the second direction. This aspect can also be subordinate to the ninth or tenth aspect.

[0032] According to this aspect, the direction of displacement from the second posture to the first posture is the direction of rotation about the engagement portion, whereby the detection portion is positioned relative to the frame by the engagement portion, and then the detection portion is rotated from the second posture to the first posture, whereby the detection portion can be easily attached with high positional accuracy. Furthermore, since the through portion is provided with the locking protrusion that stops the movement of the regulated portion, it is possible to prevent the regulated portion from being inadvertently displaced from the first posture position toward the second posture. Furthermore, since the regulated portion is elastically deformable in a direction intersecting the second direction, i.e., since a snap-fit ​​structure is formed between the regulated portion and the engaging protrusion, the regulated portion can be easily moved from the second position to the first position.

[0033] A thirteenth aspect of the detection device according to the present invention is an aspect dependent on the first aspect, and is characterized in that the frame extends in a direction parallel to the detection surface. This aspect may be subordinate to any one of the second to twelfth aspects.

[0034] According to this aspect, the frame extends in a direction parallel to the detection target portion, and therefore, in the case where the detection target portion and the frame are parallel to each other, the same effect as in the first aspect can be obtained.

[0035] A 14th aspect of the detection device of the present invention is an aspect dependent on the first aspect, characterized in that the first part has a light emitting part that emits light toward the second part, the second part has a light receiving part that receives light from the light emitting part, and the detected part has an area that transmits light from the light emitting part and an area that blocks light from the light emitting part. This aspect may be subordinate to any one of the second to thirteenth aspects.

[0036] According to this aspect, in a configuration in which a transmission type sensor having the light emitting portion and the light receiving portion is provided, it is possible to suppress the occurrence of interference between the detecting portion which serves as the sensor and the detected portion which serves as a scale.

[0037] A 15th aspect of the detection device of the present invention is an aspect dependent on the 14th aspect, and is characterized in that the detectable part is attached to a rotating body, and areas that transmit the light and areas that block the light are arranged alternately along the rotational direction of the rotating body.

[0038] According to this aspect, the detected part is attached to a rotating body, and regions that transmit the light and regions that block the light are alternately arranged along the rotation direction of the rotating body, thereby making it possible to suppress interference between the detecting part, which serves as a sensor, and the detected part, which serves as a scale, in a rotary optical encoder.

[0039] A 16th aspect of the media transport device of the present invention is characterized in that it comprises the detection device of the first aspect, a motor to which the detected part is attached, and a transport part that rotates by the power of the motor and transports the medium. Incidentally, the detection device according to any one of the second to fifteenth aspects may be adopted in place of the detection device according to the first aspect.

[0040] In order to improve the accuracy of the transport of the medium by the transport unit, the accuracy of detecting the rotation of the motor is important. According to this aspect, in such a medium transport device, the same effects as those of the first aspect can be obtained.

[0041] A 17th aspect of the media conveying device of the present invention is an aspect dependent on the 16th aspect, and further comprises a housing and a door portion that can be opened and closed relative to the housing, the frame intersects with the door portion in a closed state, the motor is attached to the frame, and the conveying portion is provided in the door portion.

[0042] The present invention provides a significant advantage in that the detection device is employed in an apparatus having a structure in which the frame intersects with the door portion, the motor is attached to the frame, and the conveying portion is provided in the door portion.

[0043] An 18th aspect of the mounting method of the present invention is an mounting method for mounting a detecting part, which has a first part and a second part that are opposed to each other and can be positioned on either side of a detectable part, to a frame along a first direction that intersects with the detectable surface of the detectable part, the method comprising: engaging an engaging part of the detecting part with an engaged part of the frame in a position where the first part and the second part do not overlap with the detectable part when viewed in the first direction; displacing the first part and the second part to a position where they overlap with the detectable part when viewed in the first direction, when the engaging part and the engaged part are engaged; and regulating the displacement of the detecting part by a regulating part of the detecting part when the engaging part and the engaged part are engaged.

[0044] According to this aspect, in the method of attaching the detection unit to the frame, the same effects as those of the first aspect can be obtained.

[0045] [Embodiment] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a detection device according to the present invention, a medium transport device including the detection device, and a method of mounting a detection unit constituting the detection device on a frame will be specifically described with reference to the drawings. In the following explanation, the three mutually orthogonal axes are referred to as the X-axis, Y-axis, and Z-axis, as shown in each figure. The directions indicated by the arrows on the three axes (X, Y, Z) are the + directions of each direction, and the opposite directions are the - directions. The Z-axis direction corresponds to the vertical direction, i.e., the direction in which gravity acts, the +Z direction indicates a vertical upward direction, and the -Z direction indicates a vertical downward direction. The X-axis and Y-axis directions correspond 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.

[0046] [Embodiment 1] <Media transport device> The medium transport device of this embodiment will be described as being provided in an inkjet printer, which is an example of a recording device. 1 to 4, the recording device 1 is provided with a medium storage unit 2 and a medium transport device 5 that transports a medium 3 (FIG. 2) such as paper stored in the medium storage unit 2. The recording device 1 further includes a recording unit (not shown) that records on the medium 3 transported by the medium transport device 5, and an ejection tray 6 onto which the medium 3 recorded in the recording unit is ejected. The recording device 1 is provided with a door section 7 that forms part of its exterior. The door section 7 is attached by a hinge 11 to the rear position (-Y side) of a housing 10 that forms the device main body. The door section 7 is configured to be openable and closable by rotating horizontally with the position of the hinge 11 as the rotation fulcrum and the front part as the free end. Fig. 1 shows the door section 7 in a closed state, and Figs. 2 and 3 show the door section 7 in an open state.

[0047] As shown in FIG. 2, the medium transport device 5 includes a transport unit 9 that is provided inside the door section 7 and transports the medium 3, a motor 12 (FIG. 4), and a detection device 19, which will be described later. In this embodiment, the transport unit 9 is composed of a drive roller 91 that rotates by receiving power from the motor 12, and a driven roller (not shown) that rotates in contact with the drive roller 91. The driven roller that constitutes the transport unit 9 is provided in the housing 10, not in the door section 7. When the door section 7 is closed, the drive roller 91 and the driven roller come into contact with each other. In this contact state, the transport unit 9 rotates, and the medium 3 is transported along the transport path 8 in the door section 7. This transport path 8 is made up of a door-side path component 13 located on the door 7 side with the medium 3 in between, and a housing-side path component (not shown) located on the housing 10 side. A drive roller 91 is provided on the door-side path component 13. The driven roller is provided on the housing-side path component.

[0048] In this embodiment, the transport path 8 in the door section 7 is a path along which the medium 3 is transported when recording is performed on both sides of the medium 3. Therefore, the transport section 9 rotates forward and backward. That is, the transport path 8 in the door section 7 can transport the medium 3 in both the forward direction (+Z direction) and the reverse direction (-Z direction). Incidentally, the transport path 8 exists not only in the door section 7, i.e., inside the housing 10. For example, there is a transport path in which the medium 3 contained in the medium container section 2 is transported through the recording execution area of ​​the recording section, a transport path toward the discharge tray 6, and the like. A transport section 9 is also provided for these other transport paths, and rotates by receiving power from a motor (not shown). Explanation and illustration of these other transport paths will be omitted.

[0049] As shown in Figures 1 and 4, the motor 12 is attached to the outer surface 15 of the frame 14 located at the rear of the housing 10. Figures 1 and 4 show the outer surface 15 of the frame 14 without illustrating the external components located at the rear of the housing 10. As shown in Figure 1, the plane of the frame 14 intersects with the plane of the door 7 in the closed state. In this case, the intersection is perpendicular. 2 and 3, a first gear train 17 is provided on an inner surface 16 of the frame 14. The first gear train 17 is provided so as to transmit the power of the motor 12. As also shown in Figures 2 and 3, a second toothed wheel row 18 is provided at a position corresponding to the first toothed wheel row 17 on the inside of the door section 7. The second toothed wheel row 18 is configured to mesh with the first toothed wheel row 17 to transmit power when the door section 7 is in a closed state. In addition, the second toothed wheel row 18 rotates the drive roller 91 of the conveying section 9 by rotating its constituent gears. In other words, when the door section 7 is in a closed state, the power of the motor 12 is transmitted to the drive roller 91 of the conveying section 9 via the first toothed wheel row 17 and the second toothed wheel row 18.

[0050] The operation of the recording unit to execute recording on the medium 3 and the operation of the medium conveying device 7 to convey the medium 3 are performed by a control unit (not shown). Here, the control unit includes a CPU, a flash ROM, and a RAM. The CPU performs various arithmetic processing according to programs stored in the flash ROM, and controls the operation of the entire recording device 1. The flash ROM, which is an example of a storage means, is a non-volatile memory that can be read and written. Various information is temporarily stored in the RAM, which is an example of a storage means.

[0051] <Detection device> The medium conveying device 5 of the present embodiment includes a detection device 19. The detection device 19 senses the amount of rotation of a rotating body 33 such as a motor 12. Information on the sensed amount of rotation is used to control the conveying operation of the medium 3. The structure of the detection device 19 of the first embodiment will be described below with reference to Figs. 4 to 10. As shown in Fig. 4, the detection device 19 of this embodiment has a detectable portion 20, a detection portion 23 that detects the detectable portion 20, and a frame 14 to which the detection portion 23 is attached. The detection portion 23 has a first portion 21 and a second portion 22 that face each other and can be arranged with the detectable portion 20 in between. In this embodiment, the detection portion 23 has a holding portion 34. In other words, the first portion 21 and the second portion 22 of the detection portion 23 are held by the holding portion 34. The detection portion 23 is attached to the frame 14 via the holding portion 34 as described below.

[0052] The detection unit 23 can engage with the frame 14 by moving relative to the frame 14 along a first direction F1 (+Y direction, FIGS. 4 and 6) that intersects with the detected surface 24 of the detected portion 20. Then, while the detection unit 23 is engaged by moving along the first direction F1, it can be displaced between a first posture (the state in FIGS. 4, 8 and 9) and a second posture (the state in FIG. 7). The frame 14 extends in a direction parallel to the detected surface 24. Note that the extension direction of the frame 14 is not limited to a direction parallel to the detected surface 24, but may be a direction intersecting the detected surface 24. The first posture is a posture in which the first portion 21 and the second portion 22 overlap the detection target portion 20 when viewed in the first direction F1. The second posture is a posture in which the first portion 21 and the second portion 22 do not overlap the detection target portion 20 when viewed in the first direction F1.

[0053] In this embodiment, as shown in the partially enlarged view of Fig. 4, the first portion 21 constituting the detection unit 23 has a light-emitting portion 29 that emits light toward the second portion 22, and the second portion 22 has a light-receiving portion 30 that receives light from the light-emitting portion 29. The detected portion 20 has an area 31 that transmits light from the light-emitting portion 29 and an area 32 that blocks light from the light-emitting portion 29. That is, a transmission type sensor is used for the detection unit 23. Note that the detection unit 23 may be a reflective type sensor. In this embodiment, as shown in Fig. 4, the detected part 20 is attached to a rotating shaft 45 of the motor 12, which is a rotating body 33. The detected part 20 is disc-shaped. Light-transmitting areas 31 and light-blocking areas 32 are alternately arranged on the periphery of the disc-shaped detected part 20 along the rotation direction of the rotating body 33. That is, the detecting part 23 and the detected part 20 are a rotary optical encoder. The detecting part 23 and the detected part 20 may be a linear encoder.

[0054] <Displacement between the first and second positions> Next, a specific structure for realizing the displacement of the detection unit 23 between the first posture and the second posture will be described. In this embodiment, as shown in Fig. 6, the frame 14 has an engaged portion 25. The engaged portion 25 can be engaged with the engaging portion 27 when the detection portion 23 moves along the first direction F1. The engaged portion 25 is a circular through hole here. As shown in Figs. 6 to 9, the frame 14 further has a restricting portion 26 that restricts the displacement of the detection portion 23 when the detection portion 23 is engaged with the engaged portion 25. 5 and 6, the detection unit 23 has an engaging portion 27. The detection unit 23 is capable of engaging the engaging portion 27 with the engaged portion 25 by movement along the first direction F1. Furthermore, as shown in FIG. 8, the detection unit 23 has a regulated portion 28 that is regulated by the regulating portion 26 when the engaging portion 27 is engaged with the engaged portion 25.

[0055] In this embodiment, as shown in Figs. 4 and 5, the detection unit 23 has a holding unit 34 in which the first portion 21, the second portion 22, the engaging portion 27, and the regulated portion 28 are provided. The first portion 21 and the second portion 22 are sensor portions that perform sensing of the detection unit 23. In other words, the engaging portion 27 and the regulated portion 28 are provided in the holding unit 34 that holds the first portion 21 and the second portion 22. The detection unit 23 is composed of the first portion 21 and the second portion 22 that are sensor portions, and the holding unit 34. The engaging portion 27 is substantially cylindrical in shape corresponding to the circular shape of the engaged portion 25. 4, 8, and 9, the engaging portion 27 and the engaged portion 25 are engaged with each other, and the restricting portion 26 restricts the restricted portion 28. The second position shown in FIG. 7, the engaging portion 27 and the engaged portion 25 are engaged with each other, and the restricting portion 26 does not restrict the restricted portion 28.

[0056] 5 and 7, in this embodiment, the displacement direction F2 from the second attitude (FIG. 7) to the first attitude (FIG. 8) is the second direction F2 along the frame 14. Here, the displacement direction and the second direction are the same, so the same reference symbol F2 is used. The displacement direction F2, i.e., the second direction F2, is a direction along the surface of the frame 14, but is not limited to the circular orbit shown in FIG. 7. For example, a straight line orbit is also included. As described above, the detection unit 23 has the first portion 21, the second portion 22, the engagement portion 27, and the holding portion 34 on which the regulated portion 28 is provided. The regulated portion 28 is provided on the surface 37 of the holding portion 34 via the extension portion 4. The extension portion 4 extends along the second direction F2, i.e., along the surface 37, relative to the holding portion 34 in a state where it is attached to the frame 14. In other words, as shown in FIG. 5, the extension portion 4 is integrally attached to the surface 37 of the holding portion 34 at the base end that is located on the opposite side (+X direction) from the regulated portion 28. Therefore, the regulated portion 28 is swingable relative to the holding portion 34 via the extension portion 4.

[0057] As shown in Fig. 9, in this embodiment, the holding portion 34 is fastened to the frame 14 by a screw 35. As shown in Fig. 5 to Fig. 8, the holding portion 34 is provided with two screw holes 43. With the detection unit 23, i.e., the holding unit 34, displaced from the second position (FIG. 7) to the first position (FIG. 8), the screw 35 is inserted into the screw hole 43 and fastened to the frame 14. The rotation direction F3 of the screw 35 during this fastening is along the second direction F2.

[0058] 5, the engaging portion 27 and the regulated portion 28 are provided on opposing surfaces 36, 37, respectively, of the holding portion 34. The surfaces 36 and 37 face each other in parallel and at a distance from each other. The engaging portion 27 is provided on the surface 36 of the holding portion 34. The regulated portion 28 is provided on the surface 37. The mutually opposing surfaces 36, 37 are surfaces that intersect with a surface 46 on which the first portion 21 and the second portion 22 are provided, as shown in Fig. 5. In addition, the mutually opposing surfaces 36, 37 are surfaces that intersect with surfaces 38, 39 formed by the first portion 21 and the second portion 22, as shown in the enlarged view in Fig. 4.

[0059] 6 to 9, in this embodiment, the frame 14 is formed with a through-hole 40 into which the regulated portion 28 can be inserted when the detection portion 23 moves in the first direction F1 to reach the second posture. Specifically, the frame 14 is formed with a through-hole 40 into which the regulated portion 28 provided on the holding portion 34 can be inserted. The through-hole 40 has a shape that allows the regulated portion 28 to move in a direction that transitions from the position of the second posture (FIG. 7) to the position of the first posture (FIG. 8). Here, the through-hole 40 is formed as a through hole. 6 in the first direction F1, the engaging portion 27 is inserted into and engaged with the engaged portion 25, and at the same time, the regulated portion 28 is inserted into the through portion 40, as shown in FIG. 7. FIG. 7 shows the second attitude.

[0060] 5 and 10, in this embodiment, the regulated portion 28 has a locking claw 42 that locks onto the back surface of the frame 14 in the insertion direction (+Y direction) when regulated by the regulating portion 26 (FIG. 10). The back surface is the inner surface 16 of the frame 14.

[0061] 7 and 8, in this embodiment, the displacement direction F2 of the detection unit 23 from the second posture (FIG. 7) to the first posture (FIG. 8), i.e., the displacement direction F2 of the holding unit 34, is the direction in which the holding unit 34 rotates around the position of the engagement unit 25. In other words, the displacement direction F2 is a direction along the surface of the frame 14. Here, the rotation angle from the second posture to the first posture is an acute angle, that is, the rotation angle when the regulated portion 28 rotates and displaces along the frame 14 around the position of the engagement portion 25 is an acute angle.

[0062] In this embodiment, the through portion 40 has a locking protrusion 41 that stops the movement of the regulated portion 28 in a direction in which the regulated portion 28 transitions from the first posture (FIG. 8) to the second posture (FIG. 7). The regulated portion 28 is configured to be elastically deformable in a direction intersecting the second direction F2. The elastic deformation in the direction intersecting the second direction F2 is achieved by the regulated portion 28 swinging relative to the holding portion 34 via the extension portion 4. 7, restricted portion 28 can move to the rear of locking protrusion 41, avoiding locking protrusion 41. When restricted portion 28 is released from elastic deformation at a position behind locking protrusion 41, it becomes locked to locking protrusion 41. That is, restricted portion 28 is in a state where its position is restricted within restricting portion 26. In other words, restricted portion 28 has its position restricted by restricting portion 26 with a snap-fit ​​structure so that it can be locked to and released from restricting portion 26. The state in which the position of the regulated portion 28 is regulated by the locking protrusion 41 within the regulating portion 26 corresponds to the first attitude. 8, the locking protrusion 41 and the restricting portion 26 are configured by attaching separate sheet metal members, but they may be configured from a single sheet metal. That is, the frame 14 may be configured from a single sheet metal member, or may be configured by combining a plurality of sheet metal members.

[0063] <How to attach the detector to the frame> The attachment method of the detection unit 23, which detects the detectable portion 20 having a first part 21 and a second part 22 that are opposed to each other and can be positioned on either side of the detectable portion 20, by moving the detection unit 23 along a first direction F1 that intersects with the detectable surface 24 of the detectable portion 20 and attaching it to the frame 14 is performed by carrying out the steps described in (1), (2), and (3) below. (1) In a posture in which the first portion 21 and the second portion 22 do not overlap the detected portion 20 when viewed in the first direction F1, the engaging portion 27 of the detecting portion 23 is engaged with the engaged portion 25 of the frame 14. This results in the second posture (FIG. 7). (2) In a state where the engaging portion 27 and the engaged portion 25 are engaged with each other, i.e., in the state of the second posture shown in Fig. 7, the first portion 21 and the second portion 22 are displaced to a posture where they overlap with the detected portion 20 when viewed in the first direction F1. This results in the state of the first posture (Figs. 4 and 8). (3) With engaging portion 27 and engaged portion 25 engaged with each other, restriction portion 26 of frame 14 restricts displacement of detection portion 23. Specifically, in the first posture, restriction portion 26 restricts restricted portion 28 of detection portion 23 from being displaced in the direction toward the second posture.

[0064] <Description of Operation of the First Embodiment> (1) In the detection device 19 of this embodiment, the detection unit 23 can be engaged with the frame 14 by moving it along the first direction F1 intersecting the detected surface 24 of the detected part 20. As a result, by moving the detection unit 23 along the first direction F1 intersecting the detected surface 24 and fixing it to the frame 14, even when it is difficult to secure space for installation in the direction along the detected surface 24 or when it must be installed along the first direction due to factors such as the orientation of the frame, the installation can be easily performed. Furthermore, it is possible to prevent the device from becoming larger. Furthermore, because the detected portion 20 is attached in a manner that it is sandwiched between the first portion 21 and the second portion 22 of the detecting portion 23, if one were to simply attach it along the first direction F1 that intersects with the detected surface 24, there is a risk that the first portion 21 or the second portion 22 will interfere with the detected portion 20. However, in this embodiment, the detecting portion 23 can be displaced to a second position ( FIG. 7 ) in which the first portion 21 and the second portion 22 do not overlap with the detected portion 20, so that the occurrence of such interference can be easily avoided. When attaching or detaching in a direction along the detection surface 24, i.e., in a direction along the XZ plane, it is necessary to insert the detection target portion 20, which is a scale, between the first part 21 and the second part 22 that constitute the sensor, so that it is necessary to secure a space at least equivalent to the length of the holding part 34 in the attachment / detachment direction (direction along the XZ plane). However, in this embodiment, the space can be made small, so that the size in the XZ plane can be made small. Also, in the case where the frame 14 and the detection surface are parallel as in this embodiment, it is possible to attach the frame 14 in a direction along the detection surface 24 by bending the frame 14 so that the mounting surface of the frame 14 is along the YZ plane, but doing so may cause a risk of a decrease in detection accuracy due to bending tolerances, etc. In this embodiment, the frame 14 is not bent, so there is no such risk.

[0065] (2) In this embodiment, the first position (FIGS. 4, 8, and 9) is a position in which the engaging portion 27 of the detection portion 23 and the engaged portion 25 of the frame 14 engage with each other, and the restricting portion 26 of the frame 14 restricts the restricted portion 28 of the detection portion 23, and the second position (FIG. 7) is a position in which the engaging portion 27 and the engaged portion 25 engage with each other, and the restricting portion 26 does not restrict the restricted portion 28. As a result, by engaging the engaging portion 27 to set the second position (FIG. 7) and then displacing the engaging portion 27 to the first position (FIG. 8) to restrict the displacement of the detection portion 23 by the restricting portion 26, the detection portion 23 can be easily attached to the frame 14 while avoiding the interference.

[0066] (3) When the detection unit 23 is moved in the first direction F1 to engage, and then rotated in the second direction F2 in the engaged state to change from the second posture to the first posture, a large force may be inadvertently applied in the second direction F2. However, in this embodiment, when the detection unit 23 is attached to the frame 14 via the holding unit 34, the extension unit 4 extends in the second direction F2, which is a direction along the frame 14, relative to the holding unit 34. As a result, even if a large force is applied in the second direction F2, the direction of the force is the same as the extending direction of the extension unit 4, so that the strength of the regulated portion 28 against the force applied in the second direction F2 is increased, and the risk of deformation can be reduced.

[0067] (4) In this embodiment, the rotation direction F3 of the screw 35 is along the second direction F2. As a result, the extension portion 4 of the regulated portion 28 extends in the rotation direction F3 of the screw 35 when it is fastened, i.e., when it is fastened or loosened. This increases the strength of the regulated portion 28 against stress and deformation applied to it by the rotation of the screw 35 when it is fastened, thereby making it possible to suppress the deformation.

[0068] (5) In the present embodiment, the engaging portion 27 and the regulated portion 28 are provided on the opposing surfaces 36, 37 of the holding portion 34. This makes it possible to separate the positions of the engaging portion 27 and the regulated portion 28, thereby preventing misalignment of the engaging portions. (6) Furthermore, since the detected portion 20 is located on the side (+X direction) from which the first portion 21 and the second portion 22 protrude, the motor 12 or the like whose rotation is to be detected may be located there (FIG. 4). In this case, if the engaging portion 27 or the regulated portion 28 is provided on the side from which the first portion 21 and the second portion 22 protrude, there is a risk of interference with the motor 12 or the like. However, in this embodiment, the mutually opposing surfaces 36, 37 are surfaces that intersect with the surface 46 on which the first portion 21 and the second portion 22 are provided, and therefore it is possible to reduce the risk of interference with the motor 12 or the like.

[0069] (7) In this embodiment, the frame 14 is formed with a through-hole 40 into which the regulated portion 28 can be inserted when the detection portion 23 moves in the first direction F1 to reach the second position (FIG. 7). This allows the regulated portion 28 to be inserted into the through-hole 40 of the frame 14, and then the detection portion 23 to be displaced in a direction along the frame 14, thereby easily transitioning from the second position (FIG. 7) to the first position (FIG. 8). This allows the detection portion 23 to be easily attached to the frame 14.

[0070] (8) In this embodiment, the regulated portion 28 has the locking claw 42 that locks with the inner surface 16, which is the back surface of the frame 14 in the insertion direction, when inserted into the through portion 40. When the holding portion 34 is attached to the frame 14 and assumes the first position (FIG. 7), if the regulated portion 28 is located above the engaging portion 27, the weight of the holding portion 34 may cause the regulated portion 28 to rotate in a direction in which it comes out of the regulating portion 26 with the position of the engaging portion 27 as a fulcrum, in other words, in a direction intersecting with the surfaces 15 and 16 formed by the frame 14, which may result in the holding portion 34 falling or being displaced. However, in this embodiment, this risk can be reduced by the locking claw 42. In other words, the locking claw 42 can reduce the risk of the holding portion 34 rotating around the X-axis.

[0071] (9) In this embodiment, the displacement direction F2 from the second posture (FIG. 7) to the first posture (FIG. 8) is a direction of rotation about the engaging portion 27. As a result, the engaging portion 27 is used to position the detector 23 relative to the frame 14, and then the detector 23 is rotated from the second posture (FIG. 7) to the first posture (FIG. 8), allowing the detector 23 to be easily attached with high positional accuracy. (10) In addition, in this embodiment, the rotation angle from the second position (FIG. 7) to the first position (FIG. 8) is an acute angle, so that the space required for mounting the holding portion 34 can be reduced.

[0072] (11) In addition, in this embodiment, when the detection unit 23 is moved in the first direction F1 to engage the engagement portion 27 with the engaged portion 25 of the frame 14 in the second position (FIG. 7), it is possible to rotate the detection unit 23 around the position of the engagement portion 27 to change the position from the second position (FIG. 7) to the first position (FIG. 8). This simplifies the operation of attaching the detection unit 23 to the frame 14. Furthermore, by causing the displacement by the rotation, it is possible to reduce the space required for the attachment operation. Further, the through portion 40 has a locking protrusion 41 that stops the movement of the regulated portion 28 from the first posture (FIG. 8) to the second posture (FIG. 7). This makes it possible to prevent the regulated portion 28 from being inadvertently displaced from the first posture (FIG. 8) toward the second posture (FIG. 7). Furthermore, since the regulated portion 28 is elastically deformable in a direction intersecting the second direction F2, i.e., since a snap-fit ​​structure is formed between the regulated portion 28 and the engaging protrusion 41, the regulated portion 28 can be easily moved from the second posture (Figure 7) to the first posture (Figure 8).

[0073] (12) In addition, in this embodiment, the frame 14 extends in a direction parallel to the detection target portion 20. Therefore, when the detection target portion 20 and the frame 14 are parallel to each other, the same effect as in the first aspect can be obtained. (13) Furthermore, in this embodiment, in a configuration in which a transmission sensor having a light-emitting portion 29 and a light-receiving portion 30 is provided, it is possible to suppress interference between the detecting portion 23 that serves as the sensor and the detected portion 20 that serves as the scale. (14) In this embodiment, the detected part 20 is attached to a rotating body 33, and regions 31 that transmit light from the light-emitting part 29 and regions 32 that block the light are alternately arranged along the rotational direction of the rotating body 33. This makes it possible to suppress interference between the detecting part 23, which serves as a sensor, and the detected part 20, which serves as a scale, in a rotary optical encoder.

[0074] (15) In the medium conveying device 5, the accuracy of detecting the rotation of the motor 12 is important to improve the accuracy of conveying the medium 3 by the conveying unit 9. According to the present embodiment, in such a medium conveying device 5, the same effects as those of the first aspect can be obtained. (16) When the medium transport device 5 is configured such that the frame 14 intersects with the door portion 7, the motor 12 is attached to the frame 14, and the transport unit 9 is provided in the door portion 7, the use of the detection device 19 is particularly effective. (17) According to the mounting method of this embodiment, in mounting the detector 23 to the frame 14, the same effects as those of the first embodiment can be obtained.

[0075] [Embodiment 2] Next, a detection device 19 according to a second embodiment will be described with reference to Fig. 11. The same parts as those in the first embodiment are given the same reference numerals, and the description of the configurations and corresponding effects will be omitted. In this embodiment, the detection unit 23 has a holding unit 34 in which the first portion 21, the second portion 22, the engagement portion 27, and the regulated portion 28 are provided. The regulated portion 28 is provided on the holding unit 34 via the extending portion 4, and the extending portion 4 extends in the first direction F1 relative to the holding unit 34 in a state where it is attached to the frame 14. In this embodiment, with the detection portion 23 attached to the frame 14 via the holding portion 34, the regulated portion 28 extends along the first direction F1 relative to the holding portion 34. As a result, the movement direction of the holding portion 34 when engaging the detection portion 23 with the frame 14 and the extension direction of the extension portion 4 of the regulated portion 28 are both the first direction F1 and are the same, making alignment easy when achieving the engagement.

[0076] Other Embodiments The detection device 19 and the medium conveying device 7 equipped with the detection device 19 according to the present invention are basically configured as in the embodiment described above, but it is of course possible to modify or omit some of the configuration within the scope of the gist of the present invention. In the above embodiment, a case has been described in which the amount of rotation of the motor 12 that drives the conveying unit provided in the door section 7 is detected, but the present invention can also be similarly applied to the case in which the amount of rotation of the motor that drives the conveying unit provided within the housing 10 is detected. In the above embodiment, the restricted portion 28 and the restricting portion 26 have a snap-fit ​​structure, but the present invention is not limited to this. The restricted portion 28 may be fastened and fixed with a screw or the like in a state where it is displaced from the second position to the first position. [Explanation of symbols]

[0077] 1... recording device, 2... medium storage section, 3... medium, 4... extension section, 5... medium transport device, 6: discharge tray; 7: door section; 8: transport path; 9: transport section; 10: housing; 11... hinge, 12... motor, 13... door side path component, 14... frame, 15...Outer surface, 16...Inner surface, 17...First gear train, 18...Second gear train, 19: detection device; 20: detected part; 21: first part; 22: second part; 23: detection portion, 24: detection surface, 25: engaged portion, 26: restriction portion, 27: engagement portion, 28: restricted portion; 29: light emitting portion; 30: light receiving portion; 31: transparent region; 32 ... blocking area, 33 ... rotating body, 34 ... holding part, 35 ... screw, 36 ... surface, 37 ... surface, 38... surface, 39... surface, 40... through-hole, 41... locking protrusion, 42... locking claw, 43... screw hole, 45...rotating shaft, 46...surface, 91...driving roller, F1: First direction, F2: Second direction (displacement direction), F3: Rotation direction

Claims

1. A detection target portion; a detection section having a first section and a second section opposed to each other so as to be disposed across the detection target section, the detection section detecting the detection target section; a frame to which the detection unit is attached; having The detection unit is the detection portion is engageable with the frame by moving along a first direction intersecting a detection surface of the detection portion, In a state where the first portion and the second portion are engaged with each other by movement along the first direction, the first portion and the second portion are displaceable between a first position in which the first portion and the second portion overlap with the detected portion as viewed in the first direction and a second position in which the first portion and the second portion do not overlap with the detected portion as viewed in the first direction. A detection device comprising:

2. the frame has an engaged portion with which the detection portion can be engaged by movement along the first direction, and a restricting portion that restricts displacement of the detection portion in a state in which the detection portion is engaged with the engaged portion, The detection unit is an engaging portion that is engageable with the engaged portion by movement along the first direction; a regulated portion that is regulated by the regulating portion in a state in which the engaging portion is engaged with the engaged portion; having the first position is a position in which the engaging portion and the engaged portion are engaged with each other and the restricting portion restricts the restricted portion; The second position is a position in which the engaging portion and the engaged portion are engaged with each other and the restricting portion does not restrict the restricted portion.

2. The detection device according to claim 1 .

3. the detection portion has a holding portion in which the first portion, the second portion, the engagement portion, and the regulated portion are provided, the restricted portion is provided on the holding portion via an extension portion, The extension portion extends along the first direction relative to the holding portion when attached to the frame.

3. The detection device according to claim 2 .

4. a displacement direction from the second attitude to the first attitude is a second direction along the frame, the detection portion has a holding portion in which the first portion, the second portion, the engagement portion, and the regulated portion are provided, the restricted portion is provided on the holding portion via an extension portion, The extension portion extends along the second direction relative to the holding portion when attached to the frame.

3. The detection device according to claim 2 .

5. The holding portion is fastened to the frame by a screw, The rotation direction of the screw is along the second direction.

5. The detection device according to claim 4, characterized in that

6. The engaging portion and the regulated portion are provided on opposing surfaces of the holding portion, 6. A detection device according to claim 2, further comprising:

7. The mutually opposing surfaces are surfaces that intersect with a surface on which the first portion and the second portion are provided.

7. The detection device according to claim 6, characterized in that

8. a through-hole into which the regulated portion can be inserted when the detection portion moves in the first direction to reach the second posture is formed in the frame; 3. The detection device according to claim 2 .

9. The regulated portion has a locking claw that is engaged with a back surface of the frame in the insertion direction when the regulated portion is regulated by the regulating portion.

9. The detection device according to claim 8, characterized in that

10. A displacement direction from the second posture to the first posture is a direction of rotation about the engagement portion.

3. The detection device according to claim 2 .

11. A rotation angle of the displacement from the second posture to the first posture is an acute angle.

11. Detection device according to claim 10, characterized in that

12. a displacement direction from the second posture to the first posture is a second direction in which the engaging portion rotates around the engaging portion, the through portion includes a locking protrusion that stops movement of the regulated portion in a direction in which the regulated portion transitions from the first posture to the second posture, The regulated portion is elastically deformable in a direction intersecting the second direction.

9. The detection device according to claim 8, characterized in that

13. The frame extends in a direction parallel to the detection surface.

2. The detection device according to claim 1 .

14. the first portion has a light emitting portion that emits light toward the second portion, the second portion has a light receiving portion that receives light from the light emitting portion, The detection portion has a region that transmits light from the light emitting portion and a region that blocks the light from the light emitting portion.

2. The detection device according to claim 1 .

15. The detection target part is attached to a rotating body, The light transmitting region and the light blocking region are alternately arranged along the rotation direction of the rotating body. Detecting device according to claim 14, characterized in that

16. A detection device according to any one of claims 1 to 15, a motor to which the detected part is attached; a conveying unit that is rotated by the power of the motor and conveys a medium; A medium transport device comprising:

17. A housing and A door portion that can be opened and closed relative to a housing; Further comprising: The frame intersects with the door section in a closed state, The motor is attached to the frame, The conveying section is provided in the door section, 17. The medium transport device of claim 16.

18. A mounting method for mounting a detection part having a first part and a second part opposed to each other so as to be disposed between the detection part and detecting the detection part, to a frame along a first direction intersecting a detection surface of the detection part, comprising: engaging an engaging portion of the detection portion with an engaged portion of the frame in a position in which the first portion and the second portion do not overlap with the detected portion when viewed in the first direction; displacing the first portion and the second portion to a position where they overlap the detected portion when viewed in the first direction in a state where the engaging portion and the engaged portion are engaged with each other; restricting displacement of the detection portion by a restriction portion of the frame in a state in which the engagement portion and the engaged portion are engaged with each other; An attachment method having

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