Medium transport apparatus and recording apparatus

Abstract

When the transmission-side double feeding detecting sensor is provided in the openable and closable top cover, there is a concern that a position of the transmission-side double feeding detecting sensor with respect to the reception-side double feeding detecting sensor may be deviated when the top cover is closed.SOLUTION: One of a transmitting portion and a receiving portion constituting the multi-feed detecting portion is provided on a first path member and the other is provided on a second path member, at least one of the first path member and the second path member is provided so as to be movable in an intersecting direction intersecting a traveling direction of a detection wave from the transmitting portion toward the receiving portion, an engaging portion is provided on one of the first path member and the second path member, and an engaged portion is provided on the other, when one of the first path-defining member and the second path-defining member is closed relative to the other, the engaging portion and the engaged portion engage with each other, so that the relative positions of the first path-defining member and the second path-defining member in the intersecting direction are determined.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a medium transport device that transports a medium, and a recording device that includes the same. [Background technology]

[0002] A technology for detecting media multifeed using ultrasonic waves has been used in the past, as shown in Patent Document 1. The paper feeder described in Patent Document 1 has an openable top cover, and a sending-side multifeed sensor is provided on the top cover. When the top cover is closed, the sending-side multifeed sensor faces the receiving-side multifeed sensor, making it possible to detect multifeed of media passing between the sending-side multifeed sensor and the receiving-side multifeed sensor. When the top cover is opened, media jammed in the transport path can be removed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-189406 Summary of the Invention [Problem to be solved by the invention]

[0004] Since the openable top cover is provided with a sending-side multi-feed sensor, there is a risk that the position of the sending-side multi-feed sensor may become misaligned with respect to the receiving-side multi-feed sensor when the top cover is closed. [Means for solving the problem]

[0005] In order to solve the above problem, a medium transport device of the present invention includes a transport path along which a medium is transported, a first path member that is a member facing a first surface of the medium and forms the transport path, a second path member that is a member facing a second surface opposite to the first surface of the medium and forms the transport path between the first path member and the second path member, and a detection unit that detects a medium transported along the transport path, wherein one of the first path member and the second path member is openable and closable relative to the other, and the detection unit has a transmitter that emits a detection wave to the medium and a receiver that receives the detection wave emitted from the transmitter, and One of the first and second path members is provided on the first path member and the other is provided on the second path member, at least one of the first and second path members is provided to be movable in an intersecting direction intersecting with the propagation direction of the detection wave from the transmitter to the receiver, one of the first and second path members is provided with an engaging portion and the other is provided with an engaged portion, and when one of the first and second path members is closed relative to the other, the engaging portion and the engaged portion engage with each other, thereby determining the relative positions of the first and second path members in the intersecting direction. A recording apparatus according to the present invention includes the medium transport device and a recording section that performs recording on the medium transported by the medium transport device. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 2 is a diagram showing the entire medium transport path in the printer. [Figure 2] FIG. 2 is an external perspective view of the printer with the door closed. [Figure 3] FIG. 2 is an external perspective view of the printer with the door open. [Figure 4] FIG. 4 is a cross-sectional view of the transport path near the double feed detection unit. [Figure 5] FIG. 4 is a perspective view of a second path member provided on the housing side. [Figure 6] FIG. 4 is a perspective view of a first path member provided on the door portion side. [Figure 7] FIG. 3 is a cross-sectional perspective view of a first path member, an upstream path member, and a downstream path member. [Figure 8] FIG. 10 is a perspective view of the back side of the second path member. [Figure 9] FIG. 4 is a perspective view of the front side of a first path member. [Figure 10] FIG. 4 is a perspective view of the back side of the first path member. [Figure 11] FIG. 10 is a perspective view of the first path member and the upstream path member in the vicinity of the second convex portion. [Figure 12] FIG. 10 is a perspective view of the first path member and the upstream path member in the vicinity of the first convex portion. [Figure 13] FIG. 6 is a cross-sectional view of the first path member and the upstream path member in the vicinity of a second convex portion. [Figure 14] FIG. 4 is a cross-sectional view of the first path member and the upstream path member in the vicinity of the first convex portion. [Figure 15] FIG. 10 is a perspective view of the second path member, seen from the back side, showing a state in which the second protrusion is fitted into the second recess. [Figure 16] 10 is a perspective view of the second path member, seen from the back side, showing a state in which the first protrusion is fitted into the first recess. FIG. [Figure 17] FIG. 4 is a diagram schematically showing the positions of the rotation axis of the door part and the first and second protrusions. [Figure 18] 10A and 10B are diagrams showing the state transition of the second protrusion when the second protrusion fits into the second recess. [Figure 19] 10A and 10B are diagrams showing the state transition of the first protrusion when the first protrusion fits into the first recess. DETAILED DESCRIPTION OF THE INVENTION

[0007] The present invention will be briefly described below. A medium transport device according to a first aspect includes a transport path along which a medium is transported, a first path member that is a member facing a first surface of the medium and forms the transport path, a second path member that is a member facing a second surface opposite to the first surface of the medium and forms the transport path between the first path member and the second path member, and a detection unit that detects a medium transported along the transport path, wherein one of the first path member and the second path member is openable and closable relative to the other, and the detection unit has a transmitter that emits a detection wave to the medium and a receiver that receives the detection wave emitted from the transmitter, and one of the transmitter and the receiver is connected to a front the other is provided on the first path member and the other is provided on the second path member, at least one of the first path member and the second path member is provided to be movable in an intersecting direction intersecting a traveling direction of the detection wave from the transmitter to the receiver, one of the first path member and the second path member is provided with an engaging portion and the other is provided with an engaged portion, and when one of the first path member and the second path member is closed relative to the other, the engaging portion and the engaged portion engage with each other, thereby determining the relative positions of the first path member and the second path member in the intersecting direction.

[0008] In a configuration in which one of the first path member and the second path member can be opened and closed relative to the other, and one of the transmitter and the receiver is provided on the first path member and the other is provided on the second path member, there is a risk of a shift in the relative positions of the transmitter and the receiver in the intersecting direction. However, according to this aspect, at least one of the first path member and the second path member is provided to be movable in the intersecting direction, and an engaging portion is provided on one of the first path member and the second path member and an engaged portion is provided on the other. When one of the first path member and the second path member is closed relative to the other, one of the first path member and the second path member can move in the intersecting direction relative to the other, and the engaging portion and the engaged portion engage with each other as a result of this movement, thereby determining the relative positions of the first path member and the second path member in the intersecting direction. Therefore, when one of the first path member and the second path member is closed relative to the other, it is possible to suppress deviation in the relative positions of the transmitter and the receiver in the intersecting direction.

[0009] A second aspect is an aspect dependent on the first aspect, characterized in that the first path member opens and closes relative to the second path member, the second path member is fixed in the intersecting direction, and the first path member is movable in the intersecting direction.

[0010] According to this aspect, the first path member opens and closes relative to the second path member, the second path member is fixed in the intersecting direction, and the first path member is movable in the intersecting direction, thereby achieving the effects of the first aspect described above.

[0011] A third aspect is an aspect dependent on the second aspect, and is characterized in that the first path member is movable in a medium transport direction. According to this aspect, since the first path member is movable in the transport direction of the medium, the relative positions of the first path member and the second path member in the transport direction can be determined.

[0012] A fourth aspect is an aspect dependent on the second aspect, and is characterized in that the first path member is movable in a width direction that intersects with the medium transport direction. According to this aspect, since the first path member is movable in the width direction intersecting the medium transport direction, the relative positions of the first path member and the second path member in the width direction can be determined. It should be noted that this aspect is not limited to the second aspect, but may be subordinate to the third aspect.

[0013] A fifth aspect is characterized in that one of the engaging portion and the engaged portion is a convex portion and the other is a concave portion, and the relative positions of the first path member and the second path member in the intersecting direction are determined by the convex portion fitting into the concave portion.

[0014] According to this aspect, one of the engaging portion and the engaged portion is a convex portion and the other is a concave portion, and the relative position of the first path member and the second path member in the intersecting direction is determined by the convex portion fitting into the concave portion, so that the relative position of the first path member and the second path member in the intersecting direction can be appropriately determined with a simple configuration. It should be noted that this aspect is not limited to the first aspect, but may be subordinate to any of the second to fourth aspects.

[0015] The sixth aspect is a dependent aspect of the fifth aspect, characterized in that it comprises a plurality of pairs of the engaging portion and the engaged portion, and the plurality of pairs of the engaging portion and the engaged portion include a pair of a first engaging portion and a first engaged portion, and a pair of a second engaging portion and a second engaged portion that are spaced apart from the first engaging portion and the first engaged portion in a width direction that intersects with the transport direction of the medium.

[0016] According to this aspect, since a plurality of pairs of the engaging portion and the engaged portion are provided, the relative positions of the first path member and the second path member in the intersecting direction are more reliably determined.

[0017] A seventh aspect is a dependent aspect of the sixth aspect, and is characterized in that the first path member and the second path member are relatively movable in the medium transport direction, which is the intersecting direction, and the width direction, which intersects the transport direction, and the first engaging portion is a first convex portion, the first engaged portion is a first concave portion into which the first convex portion fits, the second engaging portion is a second convex portion, and the second engaged portion is a second concave portion into which the second convex portion fits, and when engaged, the first convex portion and the first concave portion restrict relative movement in the transport direction and the width direction, and when engaged, the second convex portion and the second concave portion restrict relative movement in the transport direction and have play in the width direction.

[0018] According to this aspect, when the first convex portion and the first concave portion are engaged, their relative movement in the conveying direction and the width direction is restricted, and therefore the relative positions of the first path member and the second path member in the intersecting direction are appropriately determined. Furthermore, if the engagement between the first convex portion and the first concave portion is referred to as the first engagement and the engagement between the second convex portion and the second concave portion is referred to as the second engagement, and there is insufficient clearance in the conveying direction and the width direction for both the first and second engagements, there is a risk that the first and second engagements will not be realized due to manufacturing errors. That is, there is a risk that one of the first path member and the second path member will not be able to close relative to the other. However, because the second engagement has clearance in the width direction, it is possible to realize the first and second engagements, and one of the first path member and the second path member can be properly closed relative to the other.

[0019] The eighth aspect is a dependent aspect of the seventh aspect, characterized in that the second protrusion enters the second recess before the first protrusion enters the first recess. In a configuration in which the second convex portion enters the second recess before the first convex portion enters the first recess, there is a risk that the second engagement will not be achieved unless the relative positions of the second recess and the second convex portion are determined. However, according to this aspect, as in the seventh aspect, the second engagement is configured to have play in the width direction, so that the second engagement can be properly realized and one of the first path member and the second path member can be properly closed relative to the other.

[0020] A ninth aspect is a dependent aspect of the eighth aspect, characterized in that the first path member and the second path member open and close by rotating one relative to the other around a rotation axis, the width direction intersects with the axial direction of the rotation axis, and the second convex portion is located between the first convex portion and the rotation axis in the width direction.

[0021] In a configuration in which the second convex portion is located between the first convex portion and the rotation axis in the width direction, the second convex portion is located closer to the rotation axis than the first convex portion, so the angle at which the second convex portion enters the second recess is steeper than the angle at which the second convex portion enters the first recess, which may make it difficult to achieve the second fitting. However, the effect of the eighth aspect makes it possible to appropriately achieve the second fitting.

[0022] The tenth aspect is a dependent aspect of the ninth aspect, characterized in that the tip of the first convex portion is conical, and the apex of the cone is located in a position biased toward the rotation axis. As described above, the first fitting has less play than the second fitting, and therefore the first convex portion is more likely to get caught when it enters the first recess; however, the tip of the first convex portion is conical, and the apex of the cone is positioned biased toward the rotation axis, so the first convex portion can fit smoothly into the first recess.

[0023] An eleventh aspect is a dependent aspect of the ninth aspect, and further comprises a door section that can be opened and closed relative to a housing having the transport path, and a hinge section that holds the door section so that it can be opened and closed relative to the housing, the hinge section constituting the rotation axis, wherein one of the first path member and the second path member is provided on the door section, and the other of the first path member and the second path member is provided on the housing.

[0024] According to this aspect, when the door portion opens and closes relative to the housing, a shift is likely to occur in the relative position between the first path member and the second path member in the intersecting direction, i.e., the relative position between the transmitter and the receiver in the intersecting direction. However, due to the effect of the eighth aspect described above, the shift in the relative position between the transmitter and the receiver in the intersecting direction can be suppressed. It should be noted that this aspect is not limited to the ninth aspect, but may be subordinate to the tenth aspect or any of the first to eighth aspects.

[0025] A twelfth aspect is a dependent aspect of the eleventh aspect, characterized in that the first path member is provided in the door portion so as to be movable in the intersecting direction, the second path member is provided in the housing in a fixed state in the intersecting direction, the first convex portion and the second convex portion are provided on the first path member, and the first recessed portion and the second recessed portion are provided on the second path member.

[0026] According to this aspect, the first path member is provided in the door portion so as to be movable in the intersecting direction, the second path member is provided in the housing so as to be fixed in the intersecting direction, the first convex portion and the second convex portion are provided in the first path member, and the first recessed portion and the second recessed portion are provided in the second path member, and in this configuration, the functional effects of the eleventh aspect described above can be obtained.

[0027] The thirteenth aspect is a dependent aspect of the first aspect, characterized in that the transmitting unit emits ultrasonic waves as the detection wave toward the medium being transported, and the receiving unit receives the ultrasonic waves that pass through the medium being transported.

[0028] According to this aspect, the transmitter emits ultrasonic waves as the detection wave toward the medium being transported, and the receiver is configured to receive the ultrasonic waves that pass through the medium being transported, so that double feeding of media can be detected based on the intensity of the ultrasonic waves received by the receiver. It should be noted that this aspect is not limited to the first aspect, but may be subordinate to any of the second to eleventh aspects.

[0029] The 14th aspect is a dependent aspect of the 13th aspect, and comprises a medium loading section for loading the medium before feeding, a feeding section for sending out the medium from the medium loading section, and a skew correction section located downstream of the feeding section on the transport path for correcting skew of the medium, and is characterized in that the detection section is located between the feeding section and the skew correction section. According to this aspect, the detection unit is located between the feeding unit and the skew correction unit, and therefore can detect double feeding of media before skew correction.

[0030] A recording device according to a fifteenth aspect is characterized by comprising a medium conveying device according to any one of the first to fourteenth aspects and a recording unit that records on a medium conveyed by the medium conveying device. According to this aspect, the recording device can achieve the effects of any one of the first to fourteenth aspects described above.

[0031] The present invention will be specifically described below. In the following, an inkjet printer 1 that performs recording by ejecting ink, which is an example of a liquid, onto a medium such as recording paper will be described as an example of a recording device. In the following, the inkjet printer 1 will be abbreviated as printer 1. The recording device is not limited to an inkjet printer, and may be a laser printer, a dot impact printer, a thermal printer, or any other suitable printer.

[0032] The XYZ coordinate system shown in each figure is a Cartesian coordinate system, with the Y axis direction being the media width direction that intersects with the media transport direction and the device depth direction. In this embodiment, of the side surfaces that make up the periphery of the housing 2, the side surface in the +Y direction is the back surface, and the side surface in the -Y direction is the front surface. The X axis direction is the width direction of the device, with the +X direction being the left side and the -X direction being the right side as seen by the operator of the printer 1. The -X direction is also the direction in which media is fed out from each media cassette, which will be described later. The Z-axis direction is the vertical direction, that is, the height direction of the device, with the +Z direction being the upward direction and the -Z direction being the downward direction.

[0033] Below, the direction in which the medium is fed may be referred to as "downstream," and the opposite direction may be referred to as "upstream." In Figure 1, the medium transport path is indicated by a dashed line. In the printer 1, the medium is transported through the transport path indicated by the dashed line. In Figure 1, the symbols T1, T2, T3, T4, T5, and T6 each represent a transport path. Each transport path will be explained later. From the perspective of transporting the medium, the printer 1 can also be called a medium transport device 5. In this case, the printer 1 is an example of a recording device that includes the medium transport device 5 and a line head 12, which will be described later.

[0034] The printer 1 has a medium cassette 3A at the bottom of a housing 2 that includes a line head 12 (described later). The symbol P indicates the medium stored in the medium cassette 3A. The medium cassette 3A is an example of a medium loading section that loads the medium P before feeding. A pick roller 21 is provided for the medium cassette 3A to feed the stored medium in the -X direction. The pick roller 21 is an example of a feeding unit that feeds the medium from the medium cassette 3 by rotating.

[0035] A pair of feed rollers 25 is provided for medium cassette 3A, which feeds the medium sent out by pick roller 21 further downstream. Note that below medium cassette 3A, an expansion unit 4 equipped with multiple medium cassettes 3B, 3C, and 3D can be connected to the housing 2, as shown in Fig. 2. Although not shown in Fig. 1, a pick roller and a pair of feed rollers are provided for each of these multiple medium cassettes 3B, 3C, and 3D. In the following, unless otherwise specified, a "roller pair" is defined as consisting of a drive roller driven by a power source such as a motor, and a driven roller that rotates in contact with the drive roller.

[0036] 1, the symbol T1 indicates the transport path, or in other words, the feeding path, of the medium that is sent out from the medium cassette 3A and reaches the transport roller pair 31. The medium sent out from the medium cassette 3A receives a feeding force from the transport roller pairs 29 and 30 and is sent to the transport roller pair 31. In this embodiment, the transport path T1 is the path from the medium cassette 3A to the transport roller pair 31. Reference numeral 29a denotes a drive roller that constitutes the pair of transport rollers 29, and reference numeral 29b denotes a driven roller that constitutes the pair of transport rollers 29. Reference numeral 30a denotes a drive roller that constitutes the pair of transport rollers 30, and reference numeral 30b denotes a driven roller that constitutes the pair of transport rollers 30.

[0037] The transport roller pair 31 is an example of a skew correction unit that corrects skew of the medium. When the medium is sent to the transport roller pair 31, the leading edge of the medium receives a feeding force from the transport roller pairs 29 and 30 and is brought into contact with the transport roller pair 31, whereby the skew is corrected. The medium receiving the feeding force from the transport roller pair 31 is sent to the transport path T2. The transport path T2 is provided with a line head 12, which is an example of a recording unit, and a transport belt 17. The position on the transport path T2 facing the line head 12 is the recording position. In this embodiment, the transport path T2 is a linear path that runs from the transport roller pair 31 to the transport roller pair 32.

[0038] The line head 12 has nozzles 13, and performs recording by ejecting ink from the nozzles 13 onto the medium. In this embodiment, the ink is ejected from the nozzles 13 in the -Z direction. The line head 12 is an ink ejection head in which multiple nozzles 13 that eject ink are arranged to cover the entire area in the medium width direction, and is configured as an ink ejection head that can record across the entire area of ​​the medium width without moving in the medium width direction. However, the ink ejection head is not limited to this, and may be a type that is mounted on a carriage and ejects ink while moving in the medium width direction.

[0039] The line head 12 according to this embodiment ejects ink of a plurality of colors, for example. Specifically, in this embodiment, the plurality of nozzles 13 are configured with a plurality of nozzles 13 that eject yellow ink, a plurality of nozzles 13 that eject magenta ink, a plurality of nozzles 13 that eject cyan ink, and a plurality of nozzles 13 that eject black ink.

[0040] The conveyor belt 17 is an endless belt that is wound around a first roller 18, which is a drive roller, and a second roller 19, which is a driven roller, and is rotated by driving the first roller 18 by a motor (not shown). The medium is conveyed to a position facing the line head 12 while being attracted to the belt surface of the conveyor belt 17. The first roller 18 , the second roller 19 and the conveyor belt 17 constitute a belt unit 16 .

[0041] The medium on which recording has been performed by the line head 12 is sent toward either the transport roller pair 33 or the transport roller pair 39 by the transport roller pair 32 located downstream of the belt unit 16. A switching unit (not shown) for switching the transport path is provided downstream of the transport roller pair 32.

[0042] The medium has a first side and an opposite second side, and assuming that recording is performed first on the first side, when the medium is discharged without recording on the second side, or when the medium is discharged after recording on the second side, the medium is sent to discharge path T6. In this embodiment, discharge path T6 is a path that runs from transport roller pair 32 to transport roller pairs 39, 40, 41, 42, and 43, and then to transport roller pair 44. Discharge path T6 is shaped to curve and invert the medium so that the side that was most recently recorded on is on the inside. The medium sent to the discharge path T6 is discharged face-down toward the discharge tray 8 by the transport roller pair 44. The transport path may further branch off at the discharge path T6. For example, in addition to the path for discharging the medium face-down, a path for discharging the medium face-up to a discharge tray (not shown) or another device may be provided.

[0043] When recording on the second side of the medium, i.e., when double-sided recording is performed, the medium on which recording has been performed on the first side is sent to guide path T3. In this embodiment, guide path T3 is the path from transport roller pair 32 to transport roller pair 33. The medium is further sent to switchback path T4 by transport roller pair 33. In this embodiment, switchback path T4 is a path in the +X direction from transport roller pair 33. Switchback path T4 has a shape that curves and inverts the medium with the most recently recorded side facing inward. Switchback path T4 is a path that switches back the medium in order to invert the front and back of the medium that has been recorded on by line head 12. In addition to transport roller pair 33, switchback path T4 is provided with transport roller pair 34. When the medium enters the switchback path T4, the rotation direction of the transport roller pair 33, 34 is switched, and the medium is sent in the -X direction and enters the reversing path T5.

[0044] In this embodiment, the reversing path T5 is a path that runs from the transport roller pair 33 to the transport roller pair 31 via the transport roller pairs 35, 36, 37, and 38. The reversing path T5 passes above the line head 12 and is shaped to curve and invert the medium with the most recently recorded side facing outward. The reversing path T5 is a path for inverting the medium that has been switched back on the switchback path T4 and re-transporting it to the transport path T1. The medium sent to the reversing path T5 enters the transport path T1 upstream of the transport roller pair 31, and the line head 12 performs recording.

[0045] The reference numeral 10 denotes an ink storage unit serving as a liquid storage unit that stores ink before ejection. The ink to be ejected from the line head 12 is supplied from the ink storage unit 10 to the line head 12 via a tube (not shown). The ink storage unit 10 stores, as an example, black, yellow, magenta, and cyan inks.

[0046] The above is the overall configuration of the printer 1, and the following describes the multifeed detection unit 70 and related configuration. 1, a double feed detection unit 70 is provided on the transport path T1 between the transport roller pair 29 and the transport roller pair 30. The double feed detection unit 70 includes a transmitter 71 and a receiver 75 that are arranged opposite each other across the transport path T1. The transmitter 71 emits ultrasonic waves, which are an example of a detection wave for detecting media. The receiver 75 receives the ultrasonic waves emitted from the transmitter 71. The ultrasonic waves pass through the media being fed. The receiver 75 outputs a reception signal corresponding to the sound pressure of the received ultrasonic waves to the control unit (not shown) of the printer 1, and the control unit then determines whether a media double feed has occurred based on the signal strength of the received signal. For example, if the signal strength is less than a predetermined threshold, the control unit determines that a media double feed has occurred. When the control unit detects a media double feed, it stops feeding of the media.

[0047] The transmitter 71 is provided in a second path member 65, which is a member that forms the transport path T1. The receiver 75 is provided in a first path member 55, which is a member that forms the transport path T1. If the bottom surface of the medium stored in the medium cassette 3A is defined as a first surface and the top surface is defined as a second surface, the first path member 55 faces the first surface of the medium, and the second path member 65 faces the second surface of the medium. The first path member 55 is provided in the door section 50. The second path member 65 is provided in the housing 2 independently of the door section 50.

[0048] 4, an opening 65a is formed in the second path member 65, and the transmitter 71 emits ultrasonic waves through the opening 65a toward the receiver 75. Also, an opening 55a is formed in the first path member 55, and the receiver 75 receives ultrasonic waves through the opening 55a. The transmitter 71 is provided on a transmitter-side board 72, which is provided on the second path member 65 (see also FIG. 8). The receiver 75 is provided on a receiver-side board 76, which is provided on the first path member 55 (see also FIG. 10).

[0049] Incidentally, a pair of transport rollers 30 is provided directly above the transmitter 71, and when the transport rollers 30 transport the medium, paper dust may fall onto and adhere to the transmitter 71, which may adversely affect detection accuracy. For this reason, a sheet material 66 is provided above the transmitter 71, and is configured to prevent paper dust generated by the transport rollers 30 from accumulating on the sheet material 66 and adhering to the transmitter 71.

[0050] 4, which shows the transport path T1 viewed from the width direction. Strictly speaking, however, the propagation direction of the ultrasonic waves is inclined with respect to the surface of the medium to suppress multiple reflections, and has a Y-axis component in addition to an X-axis component. However, for the sake of convenience, the propagation direction of the ultrasonic waves will be described below as the -X direction. The transport direction of the medium passing between the transmitter 71 and the receiver 75 is the +Z direction, and the medium width direction is the Y-axis direction, so the medium transport direction and medium width direction are intersecting directions that intersect with the propagation direction of the ultrasonic waves. Hereinafter, the intersecting direction will be simply referred to as the intersecting direction.

[0051] Next, door unit 50 is provided on the side surface in the -X direction of housing 2, i.e., the right side, as shown in Figures 2 and 3. A lever unit 51 is provided on the end of door unit 50 in the -Y direction, i.e., the front end. A user can unlock door unit 50 from its closed state by pulling lever unit 51 in the -X direction, and door unit 50 can be opened as shown by the change from Figure 2 to Figure 3. It should be noted that the XYZ coordinate system shown in Figures 6, 7, 9 and subsequent figures indicates the coordinate system when the door section 50 is closed, and when explaining the configuration of the door section 50 with reference to Figures 6, 7, 9 and subsequent figures, the explanation will be based on the XYZ coordinate system when the door section 50 is closed.

[0052] The door unit 50 according to this embodiment is held to the housing 2 by hinges 52, 52 provided at the +Y end, i.e., the rear side of the device, and opens and closes by rotating relative to the housing 2. That is, the center of the rotation axis of the door unit 50 according to this embodiment is along the Z axis direction, and the door unit 50 rotates with the -Y end, i.e., the front side of the device, as its free end. When the door unit 50 is opened, the transport path T1 is opened. This allows the jammed media to be removed if a paper jam occurs in the transport path T1. Incidentally, the opening of the door portion 50 is not limited to a configuration in which the entire conveying path T1 is opened, but may be a configuration in which only a part of the conveying path T1 is opened.

[0053] As described above, the receiver 75 constituting the multifeed detector 70 is provided in the first path member 55, which is provided in the door 50. The transmitter 71 constituting the multifeed detector 70 is provided in the second path member 65, which is provided in the housing 2 independently of the door 50. Therefore, when the door 50 is opened or closed, the first path member 55 opens or closes relative to the second path member 65, and the receiver 75 moves forward or backward relative to the transmitter 71. For this reason, there is a risk that a shift will occur in the relative positions of the transmitter 71 and the receiver 75. In particular, a shift in the relative positions in the intersecting direction that intersects the −X direction, which is the propagation direction of the ultrasonic waves, may adversely affect detection accuracy. Therefore, the printer 1 according to this embodiment is provided with a mechanism that suppresses deviation in the relative positions in the intersecting direction between the transmitter 71 and receiver 75. This will be described in detail below.

[0054] 5, the transmitter 71 is provided at the center of the medium in the Y-axis direction, i.e., the medium width direction. Therefore, the opening 65a provided in the second path member 65 is also provided at the center of the medium in the medium width direction. A first recess 65b is provided in the second path member 65 near the end in the -Y direction close to the free end of the door section 50. Further, a second recess 65c is provided in the second path member 65 near the end in the +Y direction close to the rotation axis of the door section 50. In this specification, the term "recess" is used in a positive sense whether it has a bottom or not. A recess without a bottom may be referred to as a hole. The first recess 65b and the second recess 65c of this embodiment are recesses without a bottom. In other words, the first recess 65b and the second recess 65c of this embodiment are through-holes. The first recess 65b and the second recess 65c are an example of an engaged portion of an engaging portion and an engaged portion that engage with each other when the door portion 50 is closed. However, the first recess 65b and the second recess 65c may also be an example of an engaging portion.

[0055] In this embodiment, in the Z-axis direction, i.e., the direction along the medium transport direction, the opening 65a, the first recess 65b, and the second recess 65c are located at approximately the same position, and at least a portion of them is located at the same position in the transport direction when viewed from the medium width direction. In this embodiment, the second path member 65 is fixed to the housing 2 so as not to move in the medium transport direction or the medium width direction, that is, in the direction along the surface of the medium.

[0056] 6, the receiving unit 75 is provided at the center position of the medium in the medium width direction. Therefore, the opening 55a provided in the first path member 55 is also provided at the center position of the medium in the medium width direction. A first protrusion 55b is provided in the first path member 55 near the end in the -Y direction close to the free end of the door section 50. Further, a second protrusion 55c is provided in the first path member 55 near the end in the +Y direction close to the rotation axis of the door section 50. The first protrusion 55b and the second protrusion 55c are an example of an engaging portion among an engaging portion and an engaged portion that engage with each other when the door portion 50 is closed. However, the first protrusion 55b and the second protrusion 55c may also be an example of an engaged portion. As will be described in detail later, the first protrusion 55b fits into the first recess 65b, and the second protrusion 55c fits into the second recess 65c.

[0057] In this embodiment, in the Z-axis direction, i.e., the direction along the medium transport direction, the opening 55a, the first convex portion 55b, and the second convex portion 55c are arranged at approximately the same position, and at least a portion of them is in the same position in the transport direction when viewed from the medium width direction. In this embodiment, the first path member 55 is provided so as to be movable in the medium transport direction and medium width direction, i.e., in the direction along the surface of the medium, relative to the door section 50. In other words, the first path member 55 is provided so as to be movable relative to the transport path T1 in the medium transport direction and medium width direction, i.e., in the direction along the surface of the medium.

[0058] More specifically, an upstream path member 56 is provided in the −Z direction, which is upstream in the conveying direction, relative to the first path member 55. Furthermore, a downstream path member 57 is provided in the +Z direction, which is downstream in the conveying direction, relative to the first path member 55. Unlike the first path member 55, the upstream path member 56 and the downstream path member 57 are fixedly provided relative to the door portion 50.

[0059] 7, the symbol dz1 denotes the clearance in the Z-axis direction between the first path member 55 and the upstream path member 56. The symbol dz2 denotes the clearance in the Z-axis direction between the first path member 55 and the downstream path member 57. When the door unit 50 is open, the first path member 55 can move in the Z-axis direction between the upstream path member 56 and the downstream path member 57 within the limit of the clearance dz1+dz2.

[0060] Next, the first path member 55 is held by the upstream path member 56 as shown in FIGS. 13, which shows the vicinity of the second protrusion 55c, the upstream path member 56 has, at its +Y end, a holding portion 56a2 and a contact portion 56c2 that extend in the Y-axis direction. A gap is provided between the holding portion 56a2 and the contact portion 56c2 in the X-axis direction. A guided portion 55f2 is formed at the +Y direction end of the first path member 55 so as to protrude in the +Y direction. When the first path member 55 is dropped from above onto the upstream path member 56, the guided portion 55f2 can fit between the holding portion 56a2 and the abutting portion 56c2. This allows the +Y direction end of the first path member 55 to be held in the X axis direction and guided along the Y axis and Z axis directions. The symbol dy2 denotes the clearance between the guided portion 55f2 and the upstream path member 56 in the Y-axis direction.

[0061] 11, the upstream path member 56 has a snap-fit ​​portion 56b2 that rises in the +Z direction. The snap-fit ​​portion 56b2 is a portion that is elastically deformable in the X-axis direction and elastically deforms when the first path member 55 is dropped from above the upstream path member 56. After the first path member 55 is dropped from above the upstream path member 56, the snap-fit ​​portion 56b2 presses the first path member 55 in the -X direction. As a result, the guided portion 55f2 of the first path member 55 is pressed against the abutment portion 56c2 shown in FIG. 13. As a result, the position of the first path member 55 in the X-axis direction is determined at the +Y-direction end.

[0062] 14, which shows the vicinity of the first protrusion 55b, the upstream path member 56 has a holding portion 56a1 and a contact portion 56c1 at its -Y end. A gap is provided between the holding portion 56a1 and the contact portion 56c1 in the X-axis direction. A guided portion 55f1 is formed at the −Y direction end of the first path member 55 so as to protrude in the −Y direction. When the first path member 55 is dropped from above onto the upstream path member 56, the guided portion 55f1 can fit between the holding portion 56a1 and the abutting portion 56c1. This allows the −Y direction end of the first path member 55 to be held in the X axis direction and guided along the Y axis and Z axis directions. The symbol dy1 denotes the clearance between the guided portion 55f1 and the upstream path member 56 in the Y-axis direction. When the door portion 50 is open, the first path member 55 can move in the Y-axis direction between the upstream path member 56 and the downstream path member 57 within a clearance dy1+dy2.

[0063] 12, the upstream path member 56 has a snap-fit ​​portion 56b1 that rises in the +Z direction. The snap-fit ​​portion 56b1 is a portion that is elastically deformable in the X-axis direction and is elastically deformed when the first path member 55 is dropped from above the upstream path member 56. After the first path member 55 is dropped from above the upstream path member 56, the snap-fit ​​portion 56b1 presses the first path member 55 in the −X direction. As a result, the guided portion 55f1 of the first path member 55 is pressed against the abutment portion 56c1 shown in FIG. 14. As a result, the position of the first path member 55 in the X-axis direction is determined at the −Y-direction end.

[0064] As described above, when the door section 50 is open, the first path member 55 can move in the Z-axis direction, ie, the medium transport direction, and can also move in the Y-axis direction, ie, the medium width direction. Furthermore, at the +Y end of the first path member 55, the guided portion 55f2 is pressed against the abutment portion 56c2, and at the -Y end, the guided portion 55f1 is pressed against the abutment portion 56c1, and thus the position in the X-axis direction is determined, and therefore the position of the receiving unit 75 in the X-axis direction is determined, and the relative position in the X-axis direction between the transmitting unit 71 and the receiving unit 75 is also determined, thereby enabling appropriate detection.

[0065] 11 and 13, the second protrusion 55c is cylindrical and has a conical tip that tapers toward an apex 55e. The symbol CL2 indicates the center position of the cylindrical shape of the second protrusion 55c, and the apex 55e coincides with the center position CL2. 12 and 14, the first protrusion 55b is cylindrical and has a conical tip that tapers toward the apex 55d. CL1 is the center position of the cylindrical shape of the first protrusion 55b, and the apex 55d is located in a position offset from the center position CL1 in the +Y direction, i.e., toward the rotation axis of the door part 50. In other words, the apex 55d is located between the center position CL1 and the rotation axis of the door part 50 in the Y-axis direction.

[0066] Next, the second recess 65c into which the second protrusion 55c fits is formed to extend in the Y-axis direction, i.e., the medium width direction, as shown in Figure 15, and is formed so that its size in the medium width direction is larger than the diameter of the second protrusion 55c. The dimension of the second recess 65c in the Z-axis direction, i.e., the transport direction, is slightly larger than the diameter of the second protrusion 55c, so that the second protrusion 55c can fit in. As a result, when the second protrusion 55c and the second recess 65c are fitted together, relative movement in the Z-axis direction, i.e., the transport direction, is restricted, and there is play in the medium width direction as shown by symbols e1 and e2.

[0067] Next, the first recess 65b into which the first protrusion 55b fits is formed in a circular shape with an inner diameter slightly larger than the diameter of the first protrusion 55b so that the first protrusion 55b can fit, as shown in Fig. 16. Therefore, when the first protrusion 55b and the first recess 65b are fitted together, their relative movement in the Z-axis direction, i.e., the transport direction, and in the Y-axis direction, i.e., the medium width direction, is restricted.

[0068] In Figure 17, the reference symbol 50a denotes the rotation axis of the door unit 50. The rotation axis 50a is formed by the hinge unit 52 (see Figure 3). As shown in Figure 17, the second convex portion 55c is located between the first convex portion 55b and the rotation axis 50a in the Y-axis direction, i.e., the medium width direction. Therefore, when closing the door unit 50, the second convex portion 55c enters the opposing recess, i.e., the second recess 65c, before the first convex portion 55b.

[0069] In Figure 18, the second protrusion 55c shown by the dotted line indicates the second protrusion 55c when the door portion 50 is completely closed, and the second protrusion 55c shown by the solid line indicates an example of the second protrusion 55c just before the door portion 50 is completely closed. 19, the first protrusion 55b indicated by the two-dot chain line represents the first protrusion 55b in a state where the door unit 50 is completely closed, and the first protrusion 55b indicated by the solid line represents an example of the first protrusion 55b immediately before the door unit 50 is completely closed. The second protrusion 55c indicated by the solid line in FIG. 18 and the first protrusion 55b indicated by the solid line in FIG. 19 both represent the position and posture when the door unit 50 is open at an angle α. As shown in FIGS. 18 and 19, the second protrusion 55c closer to the rotary shaft 50a enters the mating recess, that is, the second recess 65c, before the first protrusion 55b does.

[0070] 18, the second recess 65c has a guide surface 65d2 on the -X direction, i.e., on the side that receives the second protrusion 55c. That is, the second recess 65c is formed so that it widens in the -X direction, i.e., on the side that receives the second protrusion 55c, so that the second protrusion 55c is smoothly guided into the second recess 65c. 19, first recess 65b has guide surface 65d1 on the -X direction, i.e., the side that receives first protrusion 55b. That is, first recess 65b is formed so that it widens in the -X direction, i.e., the side that receives first protrusion 55b, and this allows first protrusion 55b to be smoothly guided into first recess 65b.

[0071] With the above configuration, when the door unit 50 is closed, the first path member 55 can move in the intersecting direction relative to the second path member 65, and with this movement, the second convex portion 55c engages with the second concave portion 65c, and the first convex portion 55b engages with the first concave portion 65b. Therefore, even in a configuration in which the first path member 55 including the receiver 75 opens and closes with respect to the second path member 65 including the transmitter 71, the relative positions of the first path member 55 and the second path member 65 in the intersecting direction are determined, and deviation in the relative positions of the transmitter 71 and the receiver 75 in the intersecting direction can be suppressed.

[0072] In this embodiment, one of the engaging portion and the engaged portion is a convex portion (first convex portion 55b, second convex portion 55c), and the other is a concave portion (first concave portion 65b, second concave portion 65c). The convex portion fits into the concave portion, thereby determining the relative position of the first path member 55 and the second path member 65 in the intersecting direction. This makes it possible to appropriately determine the relative position of the first path member 55 and the second path member 65 in the intersecting direction with a simple configuration. In this embodiment, a convex portion is provided on the first path member 55 and a concave portion is provided on the second path member 65, but a concave portion may be provided on the first path member 55 and a convex portion may be provided on the second path member 65. Since it is difficult to secure a space for the convex portion on the door portion 50 side, it is preferable to provide a concave portion on the housing 2 side and a convex portion on the door portion 50 side. Furthermore, in this embodiment, the convex portion side is movable in the intersecting direction, but the concave portion side may be movable in the intersecting direction.

[0073] In this embodiment, the media storage device includes a plurality of pairs of engaging portions and engaged portions. The plurality of pairs of engaging portions and engaged portions includes a pair of a first engaging portion and a first engaged portion, and a pair of a second engaging portion and a second engaged portion that are spaced apart from the first engaging portion and the first engaged portion in the medium width direction, which intersects with the medium transport direction. Specifically, the first convex portion 55b is an example of a first engaging portion, and the first recessed portion 65b is an example of a first engaged portion. The second convex portion 55c is an example of a second engaging portion, and the second recessed portion 65c is an example of a second engaged portion. However, the first convex portion 55b may be an example of a second engaging portion, and the first recessed portion 65b may be an example of a second engaged portion. The second convex portion 55c may be an example of a first engaging portion, and the second recessed portion 65c may be an example of a second engaged portion. According to this configuration, the relative positions of the first path member 55 and the second path member 65 in the intersecting direction are more reliably determined.

[0074] In this embodiment, the first path member 55 and the second path member 65 are relatively movable in the transport direction and the medium width direction, which are examples of intersecting directions. As described with reference to Fig. 16, the first convex portion 55b and the first concave portion 65b are restricted from relative movement in the transport direction and the medium width direction when they are engaged. As described with reference to Fig. 15, the second convex portion 55c and the second concave portion 65c are restricted from relative movement in the transport direction when they are engaged, and have play in the medium width direction. The first convex portion 55b and the first concave portion 65b appropriately determine the relative positions of the first path member 55 and the second path member 65 in the intersecting direction. Here, the engagement between the first convex portion 55b and the first concave portion 65b is referred to as the first engagement, and the engagement between the second convex portion 55c and the second concave portion 65c is referred to as the second engagement. If there is no play in the transport direction and the medium width direction for both the first engagement and the second engagement, there is a risk that the first engagement and the second engagement will not be realized due to manufacturing errors. In other words, there is a risk that the first path member 55 will not be able to close relative to the second path member 65. However, because the second engagement has play in the medium width direction, it is possible to realize the first engagement and the second engagement, and one of the first path member 55 and the second path member 65 can be properly closed relative to the other.

[0075] In this embodiment, as described above, the second protrusion 55c enters the recess on the mating side, i.e., the second recess 65c, before the first protrusion 55b. In this configuration in which the second protrusion 55c enters the recess on the mating side, i.e., the second recess 65c, before the first protrusion 55b, there is a risk that the second fitting will not be achieved unless the relative positions of the second recess 65c and the second protrusion 55c are determined. However, according to this embodiment, as described above, the second engagement is configured to have play in the media width direction, so the second engagement can be properly realized, and then the first engagement can be realized, thereby properly closing the first path member to the second path member 65.

[0076] In this embodiment, the first path member 55 opens and closes by rotating around the rotation shaft 50a (see FIG. 17), and the medium width direction (Y-axis direction) intersects with the axial direction (Z-axis direction) of the rotation shaft 50a. The second convex portion 55c is located between the first convex portion 55b and the rotation shaft 50a in the medium width direction. 18 and 19, the second convex portion 55c is located closer to the rotation axis 50a than the first convex portion 55b, so the angle at which the second convex portion 55c fits into the second recess 65c is steeper than the angle at which the first convex portion 55b fits into the first recess 65b, which may make it difficult to achieve the second engagement. However, as described above, the second engagement is configured to have play in the medium width direction, so the second engagement can be properly achieved, and the first path member can be properly closed relative to the second path member 65.

[0077] 14 and 16, the tip of the first protrusion 55b is conical, and the apex 55d of the cone is positioned offset in the +Y direction, i.e., closer to the rotation axis 50a of the door part 50, with respect to the center position CL1 of the cylindrical shape. The first fitting has less play than the second fitting, so the first protrusion 55b is more likely to get caught when it enters the first recess 65b, but because the apex 55d is positioned offset closer to the rotation axis 50a, the first protrusion 55b and the first recess 65b can fit together smoothly.

[0078] Furthermore, in the present embodiment, the first path member 55 is provided in the door portion 50, and the second path member 65 is provided in the housing 2. In such a configuration, a deviation is likely to occur in the relative position between the first path member 55 and the second path member 65 in the intersecting direction, i.e., the relative position between the transmitter 71 and the receiver 75 in the intersecting direction; however, as described above, the relative positions between the first path member 55 and the second path member 65 in the intersecting direction are aligned, and therefore, deviation in the relative position between the transmitter 71 and the receiver 75 in the intersecting direction can be suppressed. In this embodiment, the first path member 55 is provided on the door section 50 so that it opens and closes relative to the second path member 65, but the second path member 65 may also be provided on the door section 50 so that it opens and closes relative to the first path member 55. In this embodiment, the door 50 is held by the hinge 52 so as to be openable and closable relative to the housing 2. That is, the two blades of the hinge 52 are attached to the door 50 and the housing 2, and the two blades rotate around a rotation axis as a fulcrum. That is, manufacturing errors that occur between the hinge 52 and the door 50 and the housing 2 tend to cause misalignment of the relative positions, particularly between the transmitter 71 and the receiver 75. Therefore, in a configuration in which the door 50 is held by the hinge 52 so as to be openable and closable relative to the housing 2, it is particularly effective to suppress misalignment of the relative positions of the transmitter 71 and the receiver 75 in the intersecting direction.

[0079] In this embodiment, the second path member 65 is provided in a fixed state in the intersecting direction, and the first path member 55 is provided to be movable in the intersecting direction. The intersecting direction includes the medium transport direction and the medium width direction. However, the present invention is not limited to this configuration, and the first path member 55 may be provided in a fixed state in the intersecting direction, and the second path member 65 may be provided so as to be movable in the intersecting direction. Alternatively, both the first path member 55 and the second path member 65 may be provided so as to be movable in the intersecting direction. In addition, in the present embodiment, the first path member 55 and the second path member 65 are relatively movable in the transport direction and the medium width direction, but this is not limiting, and they may be relatively movable in either the transport direction or the medium width direction, or may be relatively movable in the other direction. That is, it is sufficient if the first path member 55 and the second path member 65 are relatively movable in a direction that affects the arrival of the detection wave from the transmitter 71 to the receiver 75. In addition, in this embodiment, the transmitter 71 is provided in the second path member 65 and the receiver 75 is provided in the first path member 55, but the transmitter 71 may be provided in the first path member 55 and the receiver 75 may be provided in the second path member 65.

[0080] In this embodiment, the first convex portion 55b and the second convex portion 55c are provided in the first path member 55, and the first recessed portion 65b and the second recessed portion 65c are provided in the second path member 65. However, the present invention is not limited to this configuration. The first recess 65b and the second recess 65c may be provided in the first path member 55, and the first protrusion 55b and the second protrusion 55c may be provided in the second path member 65.

[0081] 1, the multi-feed detection unit 70 is located between the pick roller 21, which is an example of a feeding unit, and the transport roller pair 31, which is an example of a skew correction unit. This makes it possible to detect multi-feeding of media before skew correction. That is, if the leading edge of the media hits the transport roller pair 31, it may affect multi-feed detection, but the control unit (not shown) of the printer 1 can complete multi-feed detection before the leading edge of the media reaches the transport roller pair 31, allowing for appropriate multi-feed detection.

[0082] In this embodiment, the detectors provided on the first path member 55 and the second path member 65 are double feed detectors 70, but the detectors are not limited to this and may be medium detectors that detect the passage of a medium, or detectors that detect the characteristics or type of the medium. Also, in this embodiment, the transmitter 71 emits ultrasonic waves and the receiver 75 receives the ultrasonic waves, but the detectors are not limited to this and may, for example, employ detection light as the detection wave and be configured to include a transmitter that emits detection light and a receiver that receives the detection light.

[0083] In addition, in this embodiment, the first path member 55 and the second path member 65 are provided in a printer, which is an example of a recording device, but it goes without saying that they may also be applied to an image reading device, such as a sheet-fed type scanner. In addition, in many cases, in sheet-fed type scanners, documents set in a feed tray are sent out by a feed roller and separated by a separation roller, and then sent to an image reading sensor by a single pair of transport rollers, with the double feed detection unit being located between this pair of transport rollers and the feed roller. In contrast, in a printer, such as a recording device, particularly in a configuration in which the medium is curved and inverted from a medium cassette 3A located below the line head 12 and sent to the line head 12 as in the present embodiment, the path length from the pick roller 21 to the line head 12 tends to be long, as in the present embodiment, and the number of path components and rollers between the pick roller 21 and the line head 12 tends to be large. As a result, the door 50 for opening the transport path tends to be large, and relative positional deviation between the transmitter 71 and the receiver 75 is likely to occur. However, as described above, the first path member 55 and the second path member 65 can move in the intersecting direction, and this movement determines the relative positions of the first path member 55 and the second path member 65 in the intersecting direction, and therefore the relative positions of the transmitter 71 and the receiver 75 in the intersecting direction. Therefore, relative positional deviation between the transmitter 71 and the receiver 75 can be suitably suppressed.

[0084] The present invention is not limited to the embodiments and modifications described above, and various modifications are possible within the scope of the invention described in the claims, and it goes without saying that these modifications are also included in the scope of the present invention. [Explanation of symbols]

[0085] 1...inkjet printer, 2...casing, 3A, 3B, 3C, 3D...media cassette, 4...extension unit, 5...media transport device, 8...output tray, 10...ink storage section, 12...line head, 13...nozzle, 16...belt unit, 17...transport belt, 18...first roller, 19...second roller, 21...pick roller, 25...feed roller pair, 29-44...transport roller pair, 50...door section, 50a...rotating shaft, 51...lever section, 52...hinge section, 55...first path member, 55a...opening, 55b...first convex section, 55c...second convex section, 55d, 5 5e...top portion, 55f1, 55f2...guided portion, 56...upstream path member, 56a1, 56a2...holding portion, 56b1, 56b2...snap-fit ​​portion, 56c1, 56c2...contact portion, 57...downstream path member, 65...second path member, 65a...opening, 65b...first recess, 65c...second recess, 65d1, 65d2...guide surface, 66...sheet material, 70...multiple feed detection portion, 71...transmitting portion, 72...transmitting side board, 75...receiving portion, 76...receiving side board, T1...conveying path, T2...conveying path, T3...guiding path, T4...switchback path, T5...reversing path, T6...discharging path

Claims

1. a transport path along which the medium is transported; a first path member that faces a first surface of the medium and forms the transport path; a second path member that faces a second surface of the medium opposite to the first surface and forms the transport path between itself and the first path member; a detection unit that detects a medium transported along the transport path; Equipped with one of the first path member and the second path member is openable and closable relative to the other, The detection unit a transmitter that emits a detection wave to a medium; a receiving unit that receives the detection wave emitted from the transmitting unit; and one of the transmitter and the receiver is provided on the first path member and the other is provided on the second path member, at least one of the first path member and the second path member is provided to be movable in an intersecting direction intersecting a traveling direction of the detection wave from the transmitter to the receiver, an engaging portion is provided on one of the first path member and the second path member, and an engaged portion is provided on the other of the first path member and the second path member; When one of the first path member and the second path member is closed relative to the other, the engaging portion and the engaged portion engage with each other, thereby determining a relative position between the first path member and the second path member in the intersecting direction. A medium transport device characterized by:

2. 2. The medium transport device according to claim 1, the first path member opens and closes relative to the second path member; The second path member is provided in a fixed state with respect to the intersecting direction, The first path member is provided to be movable in the intersecting direction. A medium transport device characterized by:

3. 3. The medium transport device according to claim 2, the first path member is movable in a medium transport direction; A medium transport device characterized by:

4. 3. The medium transport device according to claim 2, the first path member is movable in a width direction intersecting a medium transport direction; A medium transport device characterized by:

5. 2. The medium transport device according to claim 1, one of the engaging portion and the engaged portion is a convex portion and the other is a concave portion, The protrusion fits into the recess, thereby determining the relative positions of the first path member and the second path member in the intersecting direction. A medium transport device characterized by:

6. 6. The medium transport device according to claim 5, a plurality of pairs of the engaging portion and the engaged portion; The plurality of pairs of the engaging portion and the engaged portion include a pair of a first engaging portion and a first engaged portion; a pair of a second engaging portion and a second engaged portion that are spaced apart from the first engaging portion and the first engaged portion in a width direction that intersects with the medium transport direction; Including, A medium transport device characterized by:

7. 7. The medium transport device according to claim 6, the first path member and the second path member are relatively movable in a medium transport direction, which is the intersecting direction, and in a width direction intersecting the transport direction, the first engaging portion is a first convex portion, and the first engaged portion is a first concave portion into which the first convex portion is fitted, the second engaging portion is a second convex portion, and the second engaged portion is a second concave portion into which the second convex portion is fitted, When the first protrusion and the first recess are fitted together, relative movement in the conveyance direction and the width direction is restricted, When the second protrusion and the second recess are fitted together, relative movement in the conveyance direction is restricted and there is play in the width direction. A medium transport device characterized by:

8. 8. The medium transport device according to claim 7, the second protrusion enters the second recess before the first protrusion enters the first recess; A medium transport device characterized by:

9. 9. The medium transport device according to claim 8, the first path member and the second path member are opened and closed by rotating one relative to the other about a rotation axis; the width direction intersects with the axial direction of the rotation shaft, the second protrusion is located between the first protrusion and the rotation shaft in the width direction; A medium transport device characterized by:

10. 10. The medium transport device according to claim 9, The tip of the first protrusion is conical, The conical apex is located at a position biased toward the rotation axis. A medium transport device characterized by:

11. 10. The medium transport device according to claim 9, a door portion that can be opened and closed relative to a housing that includes the transport path; a hinge portion that holds the door portion so as to be openable and closable relative to the housing, the hinge portion constituting the rotation axis; Furthermore, one of the first path member and the second path member is provided on the door portion, the other of the first path member and the second path member is provided in the housing. A medium transport device characterized by:

12. The medium transport device according to claim 11, The first path member is provided in the door portion so as to be movable in the intersecting direction, the second path member is provided in the housing in a fixed state with respect to the intersecting direction, the first convex portion and the second convex portion are provided on the first path member, the first recess and the second recess are provided in the second path member; A medium transport device characterized by:

13. 2. The medium transport device according to claim 1, the transmitting unit emits ultrasonic waves as the detection waves toward the medium being transported, The receiver receives the ultrasonic waves transmitted through the medium in which they are transported. A medium transport device characterized by:

14. 14. The medium transport device according to claim 13, a medium placement unit for placing the medium before feeding; a feeding unit that feeds the medium from the medium placement unit; a skew correction unit located downstream of the feeding unit on the transport path and configured to correct skew of the medium; Equipped with the detection unit is located between the feeding unit and the skew correction unit; A medium transport device characterized by:

15. a medium transport device according to any one of claims 1 to 14; a recording unit that records on the medium transported by the medium transport device; A recording device comprising:

Images