JP2020007125A - Medium conveyance device, and medium processing device - Google Patents

Abstract

To inexpensively provide detection means capable of detecting a medium at a plurality of positions in a medium conveyance path of a medium conveyance device.SOLUTION: In a medium conveyance device 9 provided to a printer 1, detection means 40 for detecting a medium in a medium conveyance path T1 comprises a light emitting part 41 which is arranged on a first side with respect to the medium conveyance path T1 to emit light from the first side toward a second side facing across the medium conveyance path T1, a light receiving part 42 which is on the first side with respect to the medium conveyance path T1 and arranged at a position deviated from the light emitting part 41 in a medium conveyance direction to receive the light emitted from the light emitting part 41, and a light guiding member 43 which is arranged on the second side with respect to the medium conveyance path T1 to guide the light emitted from the light emitting part 41 to the light receiving part 42.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a medium transport device that transports a medium, and a media processing device that performs processing on a medium transported by the medium transport device.

2. Description of the Related Art In a medium processing apparatus that performs processing on a medium conveyed by a medium conveyance apparatus, there is a medium processing apparatus provided with a medium detection unit in a medium conveyance path to detect a position of a medium conveyed on a medium conveyance path.
As the medium detection unit, for example, an optical sensor including a pair of a light emitting unit that emits light toward the medium transport path and a light receiving unit that receives light emitted from the light emitting unit is used.
Note that examples of the medium processing device include a recording device that performs a recording process on a medium and an image reading device that performs a reading process for reading an image on the medium.

In the optical sensor, as shown in FIG. 6 of Patent Document 1, a light emitting unit and a light receiving unit are provided on the same side with respect to the medium transport path, and light emitted from the light emitting unit reflects reflected light reflected on the medium. As shown in FIG. 7 of Patent Document 1, a reflection method for detecting a medium when a light receiving unit receives light, and a light emitting unit and a light receiving unit are provided so as to face each other across a medium transport path and emitted from the light emitting unit. There is a transmission system that detects the medium when the medium blocks the received light and the light receiving unit stops receiving the light.
In either method, the light receiving unit is provided at a position corresponding to the light emitting unit in the medium transport direction, and the presence or absence of the medium is determined based on whether the light receiving unit receives light emitted from the light emitting unit.

JP 2017-223777 A

Here, in a medium processing device such as a recording device or an image reading device, the medium detection unit is used, for example, to detect a jam in a medium transport path or to set a timing to start processing on a medium. Therefore, detection of the medium may be required at a plurality of positions in the transport direction of the medium transport path.
In such a case, if a light sensor including a light emitting unit and a light receiving unit provided at a position corresponding to the light emitting unit in the medium transport direction is used as a medium detecting unit, as in Patent Document 1, the detection position for each detection position In addition, a light emitting unit and a light receiving unit are required, which increases the manufacturing cost.

  A medium transport device of the present invention that solves the above problems includes a transport unit that transports a medium, a medium transport path through which a medium transported by the transport unit passes, and a detection unit that detects the medium in the medium transport path. A light-emitting unit that is disposed on a first side with respect to the medium transport path, and emits light from the first side toward a second side that is opposed to the medium transport path across the medium transport path; A light receiving unit that is disposed on the first side with respect to the medium transport path and is displaced from the light emitting unit in a medium transport direction, and receives light emitted from the light emitting unit; A light guide member disposed on the second side with respect to the medium transport path, for guiding light emitted from the light emitting unit to the light receiving unit.

FIG. 1 is an external perspective view of a printer including a medium conveyance device according to a first embodiment. FIG. 2 is a side sectional view of the printer according to the first embodiment. FIG. 2 is a schematic side sectional view illustrating a medium conveyance path of the medium conveyance device according to the first embodiment. FIG. 2 is a schematic side sectional view around a detection unit according to the first embodiment. FIG. 2 is a schematic side sectional view illustrating detection of a medium by a detection unit according to the first embodiment. FIG. 2 is a schematic plan view around a detection unit according to the first embodiment. FIG. 3 is a schematic plan view showing a modification of the detection unit in the first embodiment. FIG. 4 is a schematic side cross-sectional view illustrating a modification of the detection unit according to the first embodiment. FIG. 7 is a schematic side sectional view around a detection unit according to a second embodiment. FIG. 7 is a schematic side sectional view illustrating detection of a medium by a detection unit according to a second embodiment. FIG. 7 is a schematic side sectional view illustrating detection of a medium by a detection unit according to a second embodiment. FIG. 9 is a schematic side sectional view showing a modification of the detection unit in the second embodiment. FIG. 9 is a schematic side sectional view around a detection unit according to a third embodiment. FIG. 11 is a schematic side sectional view illustrating detection of a medium by a detection unit according to a third embodiment. FIG. 11 is a schematic side sectional view illustrating detection of a medium by a detection unit according to a third embodiment. FIG. 13 is a schematic plan view around a detection unit according to a fourth embodiment.

Hereinafter, the present invention will be schematically described.
A medium transport device according to a first aspect of the present invention includes a transport unit that transports a medium, a medium transport path through which the medium transported by the transport unit passes, and a detection unit that detects the medium in the medium transport path. A light emitting unit that is disposed on a first side with respect to the medium transport path, and emits light from the first side toward a second side opposite to the medium transport path across the medium transport path; A light receiving unit that is disposed on the first side with respect to the medium transport path and that is displaced from the light emitting unit in the medium transport direction, and that receives light emitted from the light emitting unit; And a light guide member disposed on the second side with respect to the medium transport path, for guiding light emitted from the light emitting unit to the light receiving unit.

  According to this aspect, the detection unit is disposed on a first side with respect to the medium transport path, and emits light from the first side toward a second side opposite to the medium transport path with the medium transport path interposed therebetween. A light emitting unit that emits light, and a light emitting unit that is disposed on the first side with respect to the medium transport path and that is shifted from the light emitting unit in the medium transport direction and receives light emitted from the light emitting unit. And a light guide member disposed on the second side with respect to the medium transport path and guiding the light emitted from the light emitting unit to the light receiving unit. The unit makes it possible to detect the medium at both the position where the light emitting unit is provided and the position where the light receiving unit is provided in the medium transport path. Therefore, the configuration for detecting the medium at two different positions in the medium transport direction can be realized at low cost with a small number of components. The specific detection mechanism by the detection means will be described later.

  According to a second aspect of the present invention, in the first aspect, the plurality of light emitting units are provided at different positions in the medium transport direction, and light emitted from each of the plurality of light emitting units is transmitted to one light receiving unit. It is characterized by comprising a plurality of the light guide members for guiding.

  According to this aspect, the plurality of light emitting units are provided at different positions in the medium transport direction, and include the plurality of light guide members that guide light emitted from each of the plurality of light emitting units to one light receiving unit. Therefore, the medium can be detected at a plurality of detection positions having different positions in the medium transport direction without providing a light receiving unit and a light emitting unit for each detection position.

  According to a third aspect of the present invention, in the first aspect, a plurality of the light receiving units are provided at different positions in the medium transport direction, and light emitted from one light emitting unit is applied to each of the plurality of light receiving units. It is characterized by comprising a plurality of the light guide members for guiding.

  According to this aspect, the light receiving unit includes a plurality of light guide members provided at a plurality of different positions in the medium transport direction, and guiding the light emitted from one light emitting unit to each of the plurality of light receiving units. Therefore, the medium can be detected at a plurality of detection positions having different positions in the medium transport direction without providing a light receiving unit and a light emitting unit for each detection position.

  According to a fourth aspect of the present invention, in the first aspect, a plurality of the light emitting units are provided at different positions in a width direction intersecting the medium transport direction, and emit light emitted from each of the plurality of light emitting units. And a plurality of the light guide members for guiding to the one light receiving unit.

  According to this aspect, the plurality of light-emitting units are provided at different positions in a width direction intersecting with the medium transport direction, and the plurality of light-emitting units guide light emitted from each of the plurality of light-emitting units to one light-receiving unit. Since the light guide member is provided, the medium can be detected at a plurality of detection positions having different positions in the width direction without providing a light receiving unit and a light emitting unit for each detection position.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the transport unit includes a transport roller pair for nipping and transporting the medium with two rollers, and the light emitting unit and the The light receiving unit is disposed so as to sandwich a nip position of the pair of transport rollers in the medium transport direction.

  According to this aspect, since the light emitting section and the light receiving section are arranged so as to sandwich the nip position of the pair of transport rollers in the medium transport direction, the upstream side of the pair of transport rollers and the pair of transport rollers The medium can be detected both on the downstream side and on the downstream side.

  According to a sixth aspect of the present invention, in the fifth aspect, a plurality of the transport roller pairs are arranged at intervals in a width direction crossing the medium transport direction, and the light emitting unit and the light receiving unit are , And arranged in the width direction so as to overlap the transport roller pair.

  According to this aspect, since the light emitting section and the light receiving section are arranged so as to overlap the transport roller pair in the width direction, the medium is detected in the vicinity of the nip position of the transport roller pair. Can be. Thus, the accuracy of the medium detection by the detection means can be improved.

  According to a seventh aspect of the present invention, in the fifth aspect, a plurality of the transport roller pairs are arranged at intervals in a width direction intersecting the medium transport direction, and the light emitting unit and the light receiving unit are The light guide member is arranged to be shifted from the transport roller pair in the width direction, and overlaps the transport roller pair in a direction between the axes of the two rollers.

  According to this aspect, the light-emitting unit and the light-receiving unit are arranged to be shifted with respect to the transport roller pair in the width direction, and the light guide member is configured to transport the light in a direction between the two rollers. Since the light guide member overlaps with the roller pair, the light guide member can be compactly arranged in the inter-axis direction.

  According to an eighth aspect of the present invention, in the second aspect, the transport unit includes a first transport roller pair as a transport roller pair for nipping and transporting the medium by two rollers, and the first transport roller pair in the medium transport direction. And a second transport roller pair as the transport roller pair located downstream of one transport roller pair, wherein the light receiving unit is configured to: the first transport roller pair and the second transport roller pair in the medium transport direction. And a first light emitting unit of the plurality of light emitting units is located on the upstream side of the first transport roller pair in the medium transport direction, and a first light emitting unit of the plurality of light emitting units. The light emitting unit of No. 2 is located downstream of the second pair of transport rollers in the medium transport direction.

  According to this aspect, the medium can be detected on the upstream side and the downstream side of the first transport roller pair, and on the upstream side and the downstream side of the second transport roller pair.

  According to a ninth aspect of the present invention, in the third aspect, the transport unit includes a first transport roller pair as a transport roller pair for nipping and transporting the medium by two rollers, and the first transport roller pair in the medium transport direction. And a second transport roller pair as the transport roller pair located downstream of one transport roller pair, wherein the light emitting unit is configured such that, in the medium transport direction, the first transport roller pair and the second transport roller pair And a first light receiving portion of the plurality of light receiving portions is located upstream of the first transport roller pair in the medium transport direction, and is a first light receiving portion of the plurality of light receiving portions. The light receiving unit of No. 2 is located downstream of the second pair of transport rollers in the medium transport direction.

  According to this aspect, the medium can be detected on the upstream side and the downstream side of the first transport roller pair, and on the upstream side and the downstream side of the second transport roller pair.

  A medium processing apparatus according to a tenth aspect of the present invention is the medium processing apparatus according to any one of the first to ninth aspects, and a processing unit that performs processing on the medium transported on the medium transport path. , Is provided.

  According to this aspect, in the medium processing apparatus including the processing unit that performs processing on the medium transported along the medium transport path by the medium transport apparatus, the same operation and effect as any one of the first to ninth aspects Is obtained.

  A medium processing apparatus according to an eleventh aspect of the present invention is the medium processing apparatus according to any one of the fifth to ninth aspects, and a processing unit that performs processing on the medium transported along the medium transport path. And the transport roller pair is disposed downstream of the processing unit in the medium transport direction.

  According to this aspect, since the transport roller pair is disposed on the downstream side of the processing unit in the medium transport direction, the upstream side of the transport roller pair that transports the medium after the processing by the processing unit, or A configuration may be adopted in which the medium is detected on the downstream side.

A medium processing apparatus according to a twelfth aspect of the present invention is the recording apparatus according to the tenth aspect or the eleventh aspect, further comprising a recording unit that performs a recording process on the medium as the processing unit. .
According to this aspect, in a recording apparatus including a recording unit that performs recording on the medium as the processing unit, the same operation and effect as those in the tenth or eleventh aspect can be obtained.

[First Embodiment]
A recording device as an example of a medium processing device according to an embodiment of the present invention will be described with reference to the drawings. An ink jet printer 1 will be described as an example of a recording device. Hereinafter, the inkjet printer 1 is simply referred to as the printer 1.
In the XYZ coordinate system shown in each figure, the X direction is the scanning direction of the recording head as a recording unit, and the width direction of the medium on which recording is performed. The Y direction is the apparatus depth direction, and is a direction substantially along the medium transport direction. The Z direction is a direction along the direction of gravity, and is the height direction of the device. The + Y direction side is the front side of the apparatus, and the −Y direction side is the rear side of the apparatus. The left side is the + X direction and the right side is the -X direction when viewed from the front side of the apparatus. Further, the + Z direction is referred to as upward (including the upper portion, the upper surface, and the like), and the −Z direction side is referred to as lower (including the lower portion, the lower surface, and the like). The transport direction in which the medium is transported in the printer 1 is referred to as “downstream”, and the opposite direction is referred to as “upstream”.

■■■ Overview of Printer ■■■
Hereinafter, an outline of the printer 1 will be described with reference to FIGS.
The printer 1 shown in FIG. 1 includes a recording unit 2 and a liquid storage unit 3.
The recording unit 2 includes, as shown in FIG. 2, various components including a recording head 10 as a “recording unit” that performs recording processing on a medium, and a medium transport device 9 that transports the medium toward the recording head 10. Is provided inside. The recording head 10 is also an example of a “processing unit” that performs processing on a medium.

As shown in FIG. 3, a plurality of nozzles 11 arranged at intervals in the Y-axis direction, which is the medium transport direction, are provided on a head surface located below the recording head 10. The recording head 10 is mounted on a carriage 27 that is movable in the X-axis direction that is the apparatus width direction, and performs recording by ejecting liquid ink from the nozzles 11 onto a medium while moving in the X-axis direction. It is configured as a recording head of the type.
Examples of the medium on which recording is performed in the printer 1 include recording paper such as thin paper, thick paper, and coated paper such as photographic paper, in addition to plain paper.

The printer 1 can be configured as not only a recording function but also, for example, a multifunction peripheral including a document reading function, that is, a scanner. In the present embodiment, a scanner unit 4 is provided above the recording unit 2. In FIG. 2, the detailed configuration of the scanner unit 4 is omitted.
As shown in FIG. 1, an operation unit 5 for operating the printer 1 including the scanner unit 4 is provided on the front upper side of the apparatus.

  The liquid storage unit 3 shown in FIG. 1 stores a liquid container (not shown) that stores ink to be supplied to the recording head 10. The ink is supplied from the liquid container stored in the liquid storage unit 3 to the recording head 10 via a tube (not shown).

  The recording unit 2 is provided with an upper supply mechanism 7 for supplying a medium to the recording head 10 shown in FIG. 1, an upper cover 2a for opening and closing a setting opening of the medium setting unit 8 to the upper supply mechanism 7 shown in FIG. As shown in FIG. 2, by opening the upper cover 2a, the medium can be fed from the medium setting unit 8 using the upper feeding mechanism 7.

As shown in FIG. 2, below the recording unit 2, a medium tray 6 is provided as a “medium accommodating section” for accommodating the recording unit 2. Is provided. The recording head 10 performs recording on a medium supplied by the upper supply mechanism 7 or the lower supply mechanism 12.
In the printer 1, in addition to the medium tray 6 built in the recording unit 2, an additional medium storage unit may be provided below the recording unit 2 or below the liquid storage unit 3.

■■■ Media transport route in printer ■■■
With reference to FIG. 3, the medium transport path of the medium transport device 9 that transports a medium in the printer 1 will be described. It should be noted that the medium transport device 9 can be regarded as a device in which the recording function is omitted from the printer 1 from another viewpoint. Alternatively, even if the printer 1 is provided, the printer 1 itself can be regarded as a medium transport device from the viewpoint of transporting the medium.
In FIG. 3, a solid line denoted by reference numeral T1 indicates a medium transport path that is fed from the medium tray 6 by the lower feeding mechanism 12. Hereinafter, this path is referred to as a medium transport path T1. A dashed-dotted line indicated by reference numeral T2 indicates a medium transport path that is fed by the upper feed mechanism 7. This path is called a medium transport path T2.

  In addition, the printer 1 is configured to be able to perform so-called double-sided recording, in which the medium is reversed after recording on the first surface of the medium and recording is performed on the second surface opposite to the first surface. I have. In FIG. 3, a dotted line indicated by a symbol T3 is a switchback path T3 through which the medium passes when reversing the medium after recording on the first surface when performing double-sided recording.

The medium transport device 9 is provided with detection means 40 for detecting a medium in the medium transport path. The detection means 40, which is a feature of the present invention, will be described after the description of the medium transport path.
Hereinafter, the medium transport path T1, the medium transport path T2, and the switchback path T3 will be described in this order.

<<<< About the media transport path from the media tray >>>>
The medium transport path T1 shown in FIG. 3 will be described. In the medium transport path T1, the lower supply mechanism 12, the reversing roller 20, the feed roller 21, the upstream transport roller pair 30, the first transport roller pair 31, as a “transport unit” that transports the medium in the medium transport device 9; And a second transport roller pair 32 are provided.

  In FIG. 3, reference numeral P1 denotes a medium bundle set on a medium tray 6 provided below the recording unit 2. The lower supply mechanism 12 sends out the medium bundle P1 set on the medium tray 6 one by one. The lower supply mechanism 12 includes a pickup roller 16, a lower supply roller 17, and a lower separation roller 18.

After the uppermost medium is picked up from the medium tray 6 by the pickup roller 16, the medium bundle P <b> 1 stored in the medium tray 6 is nipped by the lower feed roller 17 and the lower separation roller 18, and It is sent out.
When the pickup roller 16 picks up a plurality of media, the media is separated into one by a lower feed roller 17 and a lower separation roller 18. The pickup roller 16 and the lower feeding roller 17 are rotationally driven by a driving source (not shown).

  The reversing roller 20 is a roller that transports the medium while reversing the medium on the outer peripheral surface. The rollers denoted by reference numerals 22 and 24 are a first reverse driven roller 22 and a third reverse driven roller 24 that nip the medium between the rollers and the reverse roller 20. The medium is reversed by the reversing roller 20 and sent to the feed roller 21 with the surface of the medium tray 6 facing upward facing downward.

A feed roller 21 is provided downstream of the reversing roller 20. The reversing roller 20 and the feed roller 21 are driven by a driving source (not shown).
The roller indicated by reference numeral 25 is a first feed driven roller 25 that nips the medium between the roller and the feed roller 21. The medium is nipped by the feed roller 21 and the first feed driven roller 25, and sent to the upstream transport roller pair 30 located downstream of the feed roller 21.

  The upstream transport roller pair 30 is provided upstream of the recording head 10 in the medium transport direction. The upstream transport roller pair 30 includes an upstream transport drive roller 30a that is in contact with a surface of the medium on which recording is performed by the recording head 10 and an upstream that is driven to rotate in contact with the surface of the medium on which recording is performed by the recording head 10. And the side transport driven roller 30b.

A first transport roller pair 31 and a second transport roller pair 32 for transporting the medium are provided downstream of the recording head 10 in the medium transport direction. The first transport roller pair 31 includes a first transport drive roller 31a that is in contact with a surface of the medium on which recording is performed by the recording head 10 and a second roller that is driven to rotate in contact with the surface of the medium on which recording is performed by the recording head 10. And one transport driven roller 31b. The second transport roller pair 32 is provided downstream of the first transport roller pair 31 and has a second transport drive roller 32a in contact with the surface of the medium opposite to the surface on which recording is performed by the recording head 10; And the second transport driven roller 32b that rotates in contact with the surface on which recording is performed.
The upstream transport drive roller 30a, the first transport drive roller 31a, and the second transport drive roller 32a are rotationally driven by a drive source (not shown).

The medium is sent to the recording area K facing the recording head 10 by the upstream transport roller pair 30.
Below the recording head 10, that is, at a position facing the recording head 10, a medium support member 33 that supports the medium P is provided. Ink is ejected from the plurality of nozzles 11 of the recording head 10 to perform recording on the medium that passes through the recording area K while being supported by the medium support member 33.
The medium P after recording by the recording head 10 is discharged to the discharge tray 19 by the first transport roller pair 31 and the second transport roller pair 32.
The medium support member 33 may be provided with an adsorption mechanism for adsorbing the medium on the support surface of the medium support member 33. As the suction mechanism, for example, suction suction or electrostatic suction can be used.

<<<< Medium transport route from media setting section >>>>
Next, the medium transport path T2 which is a transport path of the medium fed from the medium setting unit 8 by the upper supply mechanism 7 will be described with reference to FIG.
The medium fed by the upper feeding mechanism 7 is set in the medium setting unit 8. A plurality of media can be set in the medium setting unit 8. In FIG. 3, the medium bundle set in the medium setting unit 8 is indicated by reference numeral P2. Of course, one medium can be set in the medium setting unit 8.

  As shown in FIG. 3, the medium setting section 8 is formed as a hopper that swings with respect to a rotation shaft 8a provided on the upstream side in the medium transport direction. 2, a paper support 34 that supports the rear end side of the medium bundle P2 is provided upstream of the medium setting section 8. The paper support 34 is configured to be able to be stored in a storage section 35 located below the paper support 34 in FIG. When paper is fed by the upper supply mechanism 7, the paper support 34 is pulled out of the storage section 35, and when the upper supply mechanism 7 is not used, the paper support 34 is stored in the storage section 35 and the upper cover 2a is closed. be able to.

Referring back to FIG. 3, an upper feed roller 13, an upper separation roller 14, and a downstream feed roller pair 15 that constitute the upper feed mechanism 7 are provided downstream of the medium setting unit 8.
The medium setting unit 8 swings so that the leading end approaches the upper feeding roller 13, and the uppermost medium of the medium bundle P 2 set in the medium setting unit 8 is supplied to the downstream side by the rotation of the upper feeding roller 13. Sent. The upper separation roller 14 nips the medium with the upper feed roller 13 to separate a plurality of media into one.

The medium fed by the upper feed roller 13 is further fed downstream by the downstream feed roller pair 15. The downstream-side feed roller pair 15 includes a downstream-side feed drive roller 15a and a downstream-side feed driven roller 15b that is driven to rotate.
The upper feed roller 13 and the downstream feed drive roller 15a are rotationally driven by a drive source (not shown).

The medium transport path T2 joins the above-described medium transport path T1 at a first junction G1 on the upstream side of the nip position between the feed roller 21 and the first feed driven roller 25.
The medium conveyed along the medium conveyance path T2 enters the medium conveyance path T1 from the first junction G1, and is thereafter sent to the recording area K by the pair of upstream conveyance rollers 30 similarly to the medium fed from the medium tray 6. After the recording is performed by the recording head 10, the recording paper is discharged to the discharge tray 19 by the first transport roller pair 31 and the second transport roller pair 32.

<<<< About double-sided recording >>>>
Next, a description will be given of the switchback path T3, which is a transport path when performing double-sided recording.
When performing double-sided recording, after recording is performed on the first surface of the medium, the upstream transport roller pair 30, the first transport roller pair 31, and the second transport roller pair 32 shown in FIG. Rotate in the opposite direction. As a result, the medium is transported in the −Y direction, which is the reverse transport direction opposite to the + Y direction, which is the medium transport direction when printing is performed by the recording head 10. The medium transported in the −Y direction enters the switchback path T3.
In the switchback path T3, the medium is nipped by the feed roller 21 and the second feed driven roller 26, is conveyed in the −Y direction, is further nipped by the reversing roller 20 and the second reversing driven roller 23, and is −Y Conveyed in the direction.

The switchback path T3 joins the medium transport path T1 at the second junction G2 on the upstream side of the nip position between the reverse roller 20 and the third reverse driven roller 24, and the medium enters the medium transport path T1 and The sheet is conveyed after being reversed by the reversing roller 20. As a result, the medium is sent to the recording area K with the first recording surface, which is the nearest recording surface, facing downward and the second surface facing upward, that is, facing the recording head 10.
After the recording on the second surface is performed by the recording head 10 in the recording area K, the medium is discharged to the discharge tray 19.

■■■ Detection means ■■■
In the medium transport path T1 of the printer 1, a detection unit 40 is provided downstream of the recording head 10 shown in FIG. In the present embodiment, the detection unit 40 located downstream of the recording head 10 will be described as an example. However, the detection unit of the medium is not limited to this position, and the upstream side of the recording head 10 in the medium transport path T1. Alternatively, it can be provided also in the medium transport path T2 and the switchback path T3.

As shown in FIG. 4, the detection means 40 according to the present embodiment includes a light emitting unit 41, a light receiving unit 42, and a light guide member 43.
The light emitting unit 41 is disposed above the medium transport path T1, and emits light L from the upper side to the lower side opposite to the medium transport path T1 with the medium transport path T1 interposed therebetween. As an example of the light source of the light emitting unit 41, an LED can be used.

  The light receiving section 42 is located above the medium transport path T1 similarly to the light emitting section 41, and is disposed at a position shifted to the upstream side with respect to the light emitting section 41 in the Y axis direction which is the medium transport direction, and emits light. The light L emitted from the unit 41 is received.

The light guide member 43 is disposed below the medium transport path T <b> 1, and guides the light L emitted from the light emitting unit 41 to the light receiving unit 42. The light guide member 43 is formed in a U-shape when viewed from the side of the device. The light guide member 43 is arranged such that one end side 43a faces the light emitting section 41 and the other end side 43b faces the light receiving section 42.
As an example, the light guide member 43 can be made of a resin material such as an acrylic, styrene, polyethylene, or polycarbonate resin. Alternatively, glass can be used.

  In the present embodiment, the light emitting unit 41 and the light receiving unit 42 are arranged across the nip position N1 of the first transport roller pair 31 that nips and transports the medium with two rollers in the medium transport direction (Y-axis direction). Have been.

In addition, the light emitting unit 41 and the light receiving unit 42 may be disposed below the medium transport path T1, and the light guide member 43 may be disposed above the medium transport path T1.
That is, the light emitting unit 41 and the light receiving unit 42 are arranged on the same first side with respect to the medium transport path T1 and are shifted in the medium transport direction, and the light guide member 43 includes the light emitting unit 41 and the light receiving unit. It is arranged on the second side opposite to the medium conveyance path T1 from the set side.

The detection unit 40 can detect the medium at the position of the light emitting unit 41 and the position of the light receiving unit 42 in the Y-axis direction that is the medium transport direction. With reference to FIG. 5, the detection of the medium by the detection means 40 will be described.
As shown in the top diagram of FIG. 5, before the leading end of the medium P reaches the detection unit 40, the light L emitted from the light emitting unit 41 passes through the light guide member 43 and is received by the light receiving unit 42. .

As shown in the second diagram from the top in FIG. 5, when the front end of the medium P is transported to a position between the light receiving unit 42 and the light guide member 43, the light L is blocked by the medium P, The unit 42 does not receive the light L. When the light receiving unit 42 switches from the light receiving state to the non-light receiving state, it can be detected that the leading end of the medium P has been transported to a position facing the light receiving unit 42.
In FIG. 5, the light receiving unit 42 in the non-light receiving state in which the light L is no longer received is shown in black, and the light receiving unit 42 in the light receiving state in which the light L is received is shown in white.

  The second diagram from the bottom in FIG. 5 shows a state in which the medium P is further transported. Even if the rear end of the medium P passes through a position facing the light receiving section 42, while the medium P is located between the light emitting section 41 and the light guide member 43, the light L from the light emitting section 41 The light L is blocked by the medium P and does not enter the light guide member 43. Therefore, the light receiving section 42 remains in the non-light receiving state.

  As shown in the bottom diagram of FIG. 5, when the rear end of the medium P passes through a position facing the light emitting unit 41, the light L from the light emitting unit 41 is no longer blocked by the medium P, and the light L is The light is received by the light receiving unit 42 via the member 43. When the light receiving unit 42 switches from the non-light receiving state to the light receiving state, it can be detected that the rear end of the medium P has passed the position facing the light emitting unit 41.

  As described above, the detecting unit 40 is configured such that the pair of the light emitting unit 41 and the light receiving unit 42 oppose the light emitting unit 41 shown in the second diagram from the top in FIG. The medium P can be detected at two positions, that is, at a position facing the light receiving unit 42 shown in the lowermost diagram. In other words, a configuration for detecting a medium at two different positions in the medium transport direction can be realized at low cost with a small number of components.

Further, in the present embodiment, the light emitting unit 41 and the light receiving unit 42 of the detecting unit 40 are arranged so as to sandwich the nip position N1 of the first conveying roller pair 31 arranged downstream of the recording head 10 in the medium conveying direction. Have been. Since the light emitting unit 41 and the light receiving unit 42 are disposed with the nip position N1 interposed therebetween, the medium P is detected both on the upstream side of the first transport roller pair 31 and on the downstream side of the first transport roller pair 31. can do.
Further, when performing double-sided printing, when the medium P is switched back from the state shown in the lowermost diagram of FIG. 5 after printing on the first side, the upstream side of the first transport roller pair 31 is also The medium P can be detected both on the downstream side of the first transport roller pair 31.

In particular, the medium P immediately after recording is easily swelled and curled due to ink penetration. For this reason, a jam is likely to occur around the first transport roller pair 31 located on the downstream side of the recording head 10.
According to the detecting means 40 of the present embodiment, the fact that the leading end of the medium P has reached the upstream side of the nip position N1 of the first transport roller pair 31 and the downstream side of the nip position N1 of the first transport roller pair 31 Since it is possible to detect that the rear end of P has passed, it is possible to increase the reliability of the jam detection around the first transport roller pair 31.

  As shown in FIG. 6, a plurality of first transport roller pairs 31 are arranged at intervals in the X-axis direction, which is a width direction intersecting the medium transport direction, and the light emitting unit 41 and the light receiving unit 42 Are arranged so as to overlap with the first transport roller pair 31 in the width direction. In addition, a plurality of rollers other than the first transport roller pair 31 are arranged at intervals in the X-axis direction.

Since the light emitting section 41 and the light receiving section 42 are arranged so as to overlap the first transport roller pair 31 in the width direction, the medium is detected near the nip position N1 of the first transport roller pair 31 in the width direction. be able to. Thus, the accuracy of the medium detection by the detection unit 40 can be improved.
In the present embodiment, the light receiving unit 42 is disposed on the upstream side (−Y side) of the light emitting unit 41. On the contrary, the light receiving unit 42 may be provided on the downstream side of the light emitting unit 41. .

<<< Modification of First Embodiment >>>
7 and 8 show a detecting means 40A as a modified example of the detecting means 40 described above.
As shown in FIG. 7, the light emitting unit 41A and the light receiving unit 42A of the detecting unit 40A are arranged so as to be shifted from the first transport roller pair 31 in the X-axis direction which is the width direction. Further, as shown in FIG. 8, the light guide member 43A has a direction D between the axes of the first transport driving roller 31a and the first transport driven roller 31b constituting the first transport roller pair 31, that is, a symbol in FIG. It is formed so as to overlap the first transport roller pair 31 in the direction indicated by the double arrow with D. In the present embodiment, the inter-axis direction D is a direction substantially along the height direction Z.
With the above configuration, the light guide member 43A can be compactly arranged in the inter-axis direction D.

  Further, the light emitting unit 41A and the light receiving unit 42A are arranged so as to overlap the first transport driving roller 31a and the first transport driven roller 31b in the Y-axis direction which is the medium transport direction. Thus, the detection means 40A can be arranged compactly in the medium transport direction. Further, as shown in FIG. 8, the medium can be detected at a position closer to the nip position N1 of the first transport roller pair 31.

[Second embodiment]
In the present embodiment, a detection unit 50 which is another example of the detection unit will be described with reference to FIGS.
In the embodiments after this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof will be omitted.

As shown in FIG. 9, the detection unit 50 according to the second embodiment includes a plurality of light emitting units provided at different positions in the medium transport direction. In the present embodiment, two light emitting units, a first light emitting unit 51 and a second light emitting unit 52, are provided above the medium transport path T1.
One light receiving unit 53 is provided for the two light emitting units, and the first light emitting unit 51, the light receiving unit 53, and the second light emitting unit 52 are arranged in this order from the upstream side in the medium transport direction.

  The first light emitting unit 51 and the light receiving unit 53 are arranged so as to sandwich the nip position N1 of the first conveying roller pair 31 in the medium conveying direction. The second light emitting unit 52 and the light receiving unit 53 are arranged so as to sandwich the nip position N2 of the second pair of conveying rollers 32 in the medium conveying direction.

  In other words, the light receiving unit 53 is located between the first transport roller pair 31 and the second transport roller pair 32 in the medium transport direction, and the first light emitting unit 51 is located in the first transport roller pair in the medium transport direction. The second light emitting unit 52 is located on the upstream side of the first pair 31 and is located on the downstream side of the second pair of transport rollers 32 in the medium transport direction.

  Then, on the lower side of the medium transport path T1, the first light guide member 54 and the second light guide member 54 that guide light emitted from each of the first light emitting unit 51 and the second light emitting unit 52 to one light receiving unit 53. A light guide member 55 is provided. The first light guide member 54 guides light emitted from the first light emitting unit 51 to the light receiving unit 53. The second light guide member 55 guides light emitted from the second light emitting unit 52 to the light receiving unit 53.

Hereinafter, the detection of the medium by the detection unit 50 will be described with reference to FIGS. 10 and 11.
As shown in the upper diagram of FIG. 10, before the leading end of the medium P reaches the detecting unit 50, the light L1 emitted from the first light emitting unit 51 passes through the first light guide member 54 and is received by the light receiving unit 53. Then, the light L2 emitted from the second light emitting section 52 passes through the second light guide member 55 and is received by the light receiving section 53.

Subsequently, as shown in the middle diagram of FIG. 10, when the leading end of the medium P is transported to a position between the first light emitting unit 51 and the first light guide member 54, the light P1 is emitted by the medium P. Since the light L1 does not enter the first light guide member 54 because of being blocked, the light receiving unit 53 does not receive the light L1. On the other hand, the light L2 emitted from the second light emitting unit 52 is received by the light receiving unit 53.
When the amount of light emitted from the first light emitting unit 51 and the amount of light emitted from the second light emitting unit 52 are the same, the amount of light received by the light receiving unit 53 is about half of the state shown in the upper diagram of FIG. This state is called a semi-light receiving state.
When the light receiving unit 53 switches from the light receiving state to the semi-light receiving state, it is possible to detect that the leading end of the medium P has been transported to a position facing the first light emitting unit 51.
In FIGS. 10 and 11, the light receiving unit 53 in the semi-light receiving state is hatched, and the light receiving unit 53 in the light receiving state is shown in white. The light-receiving portion 53 in a non-light-receiving state described later is shown in black.

When the medium P is further conveyed and the medium P is positioned between the light receiving unit 53 and both the first light guide member 54 and the second light guide member 55 as shown in the lower diagram of FIG. Since the light L2 from the second light emitting unit 52 is blocked by the medium P, the light L2 is no longer received by the light receiving unit 53, and the light receiving unit 53 enters a non-light receiving state in which neither the light L1 nor the light L2 is received.
When the light receiving unit 53 switches from the semi-light receiving state to the non-light receiving state, it is possible to detect that the leading end of the medium P has been transported to a position facing the light receiving unit 53.

As shown in the upper diagram of FIG. 11, when the rear end of the medium P passes through a position facing the light receiving unit 53, light L1 from the first light emitting unit 51 is transmitted through the first light guide member 54 to the light receiving unit 53. Is received. Since there is the medium P between the second light emitting unit 52 and the second light guide member 55, the light L2 from the second light emitting unit 52 is not received by the light receiving unit 53. That is, the light receiving unit 53 is in a semi-light receiving state.
When the light receiving unit 53 switches from the non-light receiving state to the semi-light receiving state, it can be detected that the rear end of the medium P has passed the position facing the light receiving unit 53.

As shown in the lower diagram of FIG. 11, when the rear end of the medium P passes through a position facing the second light emitting unit 52, the light L2 from the second light emitting unit 52 is received by the light receiving unit 53. , The light receiving unit 53 is in a light receiving state of receiving both the light L1 and the light L2.
When the light receiving unit 53 switches from the semi-light receiving state to the light receiving state, it can be detected that the rear end of the medium has passed the position facing the second light emitting unit 52.

As described above, the detection unit 50 uses the first light-emitting unit 51, the second light-emitting unit 52, and the light-receiving unit 53 to determine the position of the medium transport path T1 in the middle diagram of FIG. It is possible to detect the passage of the medium P at four positions, that is, the position shown in the upper part of FIG. 11 and the position shown in the lower part of FIG.
That is, the medium can be detected at a plurality of detection positions without providing a light receiving unit and a light emitting unit for each detection position. Note that three or more light emitting units can be provided for one light receiving unit.

<<< Modification of Second Embodiment >>>
FIG. 12 shows a detecting unit 50A as a modified example of the detecting unit 50 described above.
As shown in FIG. 12, the detection unit 50A includes a first light-emitting unit 51A, a second light-receiving unit 52A, and a light-receiving unit 53A, the first light-emitting unit 51A, the second light-receiving unit 52A, and the second light-receiving unit 53A. The light receiving section 52A and the light receiving section 53A are arranged in this order.
The first light emitting unit 51A is disposed upstream of the first transport roller pair 31, and the second light receiving unit 52A is disposed between the first transport roller pair 31 and the second transport roller pair 32 to receive light. The portion 53A is arranged downstream of the second transport roller pair 32.

  Although not shown, the first light emitting unit 51A, the second light receiving unit 52A, and the light receiving unit 53A are arranged from the upstream side in the medium transport direction by the light receiving unit 53A, the first light emitting unit 51A, and the second light emitting unit 51A. It is also possible to arrange them in the order of the light receiving unit 52A.

[Third embodiment]
In the present embodiment, a detection unit 60 which is another example of the detection unit will be described with reference to FIGS.
As shown in FIG. 13, the detection unit 60 according to the third embodiment includes a plurality of light emitting units provided at different positions in the medium transport direction. In the present embodiment, one light emitting unit 61 and two light receiving units, a first light receiving unit 62 and a second light receiving unit 63, are provided above the medium transport path T1.
These are arranged in order of a first light receiving unit 62, a light emitting unit 61, and a second light receiving unit 63 from the upstream side in the medium transport direction.

  The first light receiving unit 62 and the light emitting unit 61 are arranged so as to sandwich the nip position N1 of the first transport roller pair 31 in the medium transport direction. The light emitting section 61 and the second light receiving section 63 are arranged so as to sandwich the nip position N2 of the second transport roller pair 32 in the medium transport direction.

  In other words, the light emitting unit 61 is located between the first transport roller pair 31 and the second transport roller pair 32 in the medium transport direction, and the first light receiving unit 62 is located on the first transport roller pair in the medium transport direction. The second light receiving unit 63 is located on the upstream side of the pair 31 and is located on the downstream side of the second transport roller pair 32 in the medium transport direction.

On the lower side with respect to the medium transport path T1, a first light guide member 64 for guiding the light L emitted from the light emitting unit 61 to the first light receiving unit 62, and a light L emitted from the light emitting unit 61, A second light guide member 65 for guiding to the second light receiving unit 63 is provided.
That is, the first light guide member 64 and the second light guide member 65, which are a plurality of light guide members, that guide the light L emitted from one light emitting unit 61 to each of the first light receiving unit 62 and the second light receiving unit 63. Is provided.

Hereinafter, the detection of the medium by the detection unit 60 will be described with reference to FIGS. 14 and 15.
As shown in the upper diagram of FIG. 14, before the leading end of the medium P reaches the detection unit 60, the light L emitted from the light emitting unit 61 passes through each of the first light guide member 64 and the second light guide member 65. As described above, the light is received by both the first light receiving unit 62 and the second light receiving unit 63.

Subsequently, as shown in the middle diagram of FIG. 14, when the leading end of the medium P is conveyed to a position facing the first light guide member 64, the light L is blocked by the medium P and the first light receiving unit 62 Light L is no longer received. On the other hand, the second light receiving section 63 keeps receiving the light L.
By switching only the first light receiving unit 62 from the light receiving state to the non-light receiving state, it is possible to detect that the leading end of the medium P has been transported to a position facing the first light receiving unit 62.
In FIGS. 14 and 15, the first light receiving portion 62 or the second light receiving portion 63 in the light receiving state is shown in black, and the first light receiving portion 62 or the second light receiving portion 63 in the light receiving state is outlined. Indicated by

When the medium P is further conveyed and the leading end of the medium P faces the light emitting unit 61 as shown in the lower diagram of FIG. 14, the light L from the light emitting unit 61 is blocked by the medium P, so that the light L is transmitted to the first light guide member. Neither the light receiving member 64 nor the second light guiding member 65 enters, and both the first light receiving part 62 and the second light receiving part 63 are in a non-light receiving state.
When the state where only the first light receiving section 62 is in the non-light receiving state is switched to the state where both the first light receiving section 62 and the second light receiving section 63 are in the non-light receiving state, the leading end of the medium P It can be detected that the sheet is conveyed to a position facing the light emitting unit 61.

As shown in the upper diagram of FIG. 15, when the rear end of the medium P passes through a position facing the light emitting unit 61, the light L from the light emitting unit 61 is transmitted through the first light guide member 64 to the first light receiving unit 62. Is received. Since the medium P exists between the second light receiving unit 63 and the second light guide member 65, the light L from the light emitting unit 61 is not received by the second light receiving unit 63.
When the state where both the first light receiving unit 62 and the second light receiving unit 63 are in the non-light receiving state is switched to the state where only the second light receiving unit 63 is in the non-light receiving state, the rear end of the medium P Has passed the position facing the light emitting unit 61.

As shown in the lower diagram of FIG. 15, when the rear end of the medium P passes through a position facing the second light receiving unit 63, the light L from the light emitting unit 61 emits light L from the first light receiving unit 62 and the second light receiving unit 63. Are received by both.
When the state where only the second light receiving unit 63 is in the non-light receiving state is switched to the state where both the first light receiving unit 62 and the second light receiving unit 63 are in the light receiving state, the rear end of the medium is moved to the second state. It can be detected that the vehicle has passed the position facing the second light receiving unit 63.

As described above, the detecting unit 60 uses the light emitting unit 61, the first light receiving unit 62, and the second light receiving unit 63 to determine the position of the medium transport path T1 shown in the middle view of FIG. It is possible to detect the passage of the medium P at four positions, that is, the position shown in the upper part of FIG. 15 and the position shown in the lower part of FIG.
That is, a medium can be detected at a plurality of detection positions without providing a light receiving unit and a light emitting unit for each detection position. Also in the present embodiment, it is possible to provide three or more light receiving units for one light emitting unit.

  Although not shown, the light-emitting unit 61, the first light-receiving unit 62, and the second light-receiving unit 63 are connected to the first light-receiving unit 62, the second light-receiving unit 63, It is also possible to arrange them in the order of the units 61 or the light emitting unit 61, the first light receiving unit 62, and the second light receiving unit 63 in this order.

[Fourth embodiment]
In the present embodiment, a detection unit 70 which is another example of the detection unit will be described with reference to FIG.
As shown in FIG. 16, the detecting unit 70 includes a plurality of light emitting units provided at different positions in a width direction (X axis direction) intersecting with the medium transport direction (Y axis direction), that is, a first light emitting unit 71. And the second light emitting unit 72 and the first light guiding member 74 and the second light guiding member 75 for guiding the light emitted from each of the first light emitting unit 71 and the second light emitting unit 72 to one light receiving unit 73. Have.

The first light emitting unit 71 and the light receiving unit 73 are arranged so as to sandwich the nip position N1 of the first conveying roller pair 31 in the medium conveying direction, and the second light emitting unit 72 and the light receiving unit 73 In the transport direction, the first transport roller pair 31 is disposed across the nip position N1.
In the present embodiment, the first light emitting section 71 and the second light emitting section 72 are arranged on the upstream side of the nip position N1, and the light receiving section 73 is arranged on the downstream side of the nip position N1.
Note that the positional relationship between the first light emitting unit 71 and the second light emitting unit 72 and the light receiving unit 73 in the medium transport direction may be opposite to the arrangement shown in FIG. That is, the light receiving section 73 can be arranged upstream of the nip position N1, and the first light emitting section 71 and the second light emitting section 72 can be arranged downstream of the nip position N1.

  As in the first embodiment, the detecting means 70 can detect the medium on both the upstream side and the downstream side of the nip position N1 of the first transport roller pair 31. Further, since the first light emitting section 71 and the second light emitting section 72 are provided at the same position in the medium transport direction and at different positions in the width direction, for example, a skew in which the medium is transported obliquely is provided. Can be detected.

The first light emitting unit 71 and the second light emitting unit 72 may be provided at different positions in the medium transport direction.
In addition, a single light emitting unit may be provided, and a plurality of light receiving units disposed at different positions in the medium transport direction from the light emitting unit may be provided at different positions in the width direction.

  As described above, the printer has been described as an example of the medium processing apparatus. However, for example, a scanner that performs an image reading process on a transported medium can be similarly applied.

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

DESCRIPTION OF SYMBOLS 1 ... Inkjet printer (medium processing apparatus, recording device), 2 ... Recording unit, 3 ... Liquid storage unit, 4 ... Scanner part, 5 ... Operation part, 6 ... Medium tray, 7 ... Upper supply mechanism, 8 ... Medium setting part , 9: Medium transport device, 10: Recording head (recording section), 11: Nozzle, 12: Lower feeding mechanism, 13: Upper feeding roller, 14: Upper separating roller, 15: Downstream feeding roller pair, 15a ... Downstream feed drive roller, 15b Downstream feed driven roller, 16 Pickup roller, 17 Lower feed roller, 18 Lower separation roller, 19 Discharge tray, 20 Reverse roller, 21 Feed roller, 22 1st reversing driven roller, 23 2nd reversing driven roller, 24 3rd reversing driven roller, 25 1st feeding driven roller, 26 2nd feeding driven row -, 27: carriage, 30: upstream transport roller pair, 31: first transport roller pair, 32: second transport roller pair, 33: medium support member, 34: paper support, 35: storage unit, 40: detecting means 41, a light emitting section, 42, a light receiving section, 43, a light guiding member, 50, a detecting means, 51, a first light emitting section, 52, a second light emitting section, 53, a light receiving section, 54, a first light guiding member. 55, a second light guide member, 60, a detecting means, 61, a light emitting portion, 62, a first light receiving portion, 63, a second light receiving portion, 64, a first light guiding member, 65, a second light guiding member. , 70 detecting means, 71 first light emitting section, 72 second light emitting section, 73 light receiving section, 74 first light guide member, 75 second light guide member, T1 medium transport path, T2 ... Medium transport path, T3 ... Switchback path, G1 ... First junction, G2 ... Second junction

Claims (12)

A transport unit that transports the medium,
A medium conveyance path through which the medium conveyed by the conveyance unit passes;
Detecting means for detecting the medium in the medium transport path,
The detecting means,
A light emitting unit that is disposed on a first side with respect to the medium transport path, and emits light from the first side toward a second side that is opposed to the medium transport path across the medium transport path;
A light receiving unit that is disposed on the first side with respect to the medium transport path and is displaced from the light emitting unit in a medium transport direction, and receives light emitted from the light emitting unit;
A light guide member that is arranged on the second side with respect to the medium transport path and guides light emitted from the light emitting unit to the light receiving unit.
A medium conveying device characterized by the above-mentioned. The medium transport device according to claim 1,
The plurality of light emitting units are provided at different positions in the medium transport direction,
Comprising a plurality of light guide members for guiding light emitted from each of the plurality of light emitting units to one light receiving unit,
A medium conveying device characterized by the above-mentioned. The medium transport device according to claim 1,
The light receiving unit is provided at a plurality of different positions in the medium transport direction,
It comprises a plurality of light guide members for guiding light emitted from one light emitting unit to each of the plurality of light receiving units,
A medium conveying device characterized by the above-mentioned. The medium transport device according to claim 1,
A plurality of the light emitting units are provided at different positions in a width direction crossing the medium transport direction,
Comprising a plurality of light guide members for guiding light emitted from each of the plurality of light emitting units to one light receiving unit,
A medium conveying device characterized by the above-mentioned. In the medium transport device according to any one of claims 1 to 4,
The transport unit includes a transport roller pair for nipping and transporting the medium with two rollers,
The light emitting unit and the light receiving unit are arranged with the nip position of the transport roller pair interposed therebetween in the medium transport direction,
A medium conveying device characterized by the above-mentioned. The medium transport device according to claim 5,
In the width direction crossing the medium transport direction, a plurality of the transport roller pairs are arranged at intervals.
The light emitting unit and the light receiving unit are arranged to overlap with the transport roller pair in the width direction,
A medium conveying device characterized by the above-mentioned. The medium transport device according to claim 5,
In the width direction crossing the medium transport direction, a plurality of the transport roller pairs are arranged at intervals.
The light emitting unit and the light receiving unit are arranged to be shifted with respect to the transport roller pair in the width direction,
The light guide member overlaps the transport roller pair in a direction between the axes of the two rollers,
A medium conveying device characterized by the above-mentioned. The medium transport device according to claim 2,
The transport unit includes a first transport roller pair as a transport roller pair that nips and transports the medium with two rollers, and a transport roller pair positioned downstream of the first transport roller pair in the medium transport direction. And a second conveying roller pair of
The light receiving unit is located between the first transport roller pair and the second transport roller pair in the medium transport direction,
A first light emitting unit of the plurality of light emitting units is located on an upstream side of the first transport roller pair in the medium transport direction,
A second light emitting unit of the plurality of light emitting units is located downstream of the second transport roller pair in the medium transport direction.
A medium conveying device characterized by the above-mentioned. The medium transport device according to claim 3,
The transport unit includes a first transport roller pair as a transport roller pair that nips and transports the medium with two rollers, and a transport roller pair positioned downstream of the first transport roller pair in the medium transport direction. And a second conveying roller pair of
The light emitting unit is located between the first transport roller pair and the second transport roller pair in the medium transport direction,
A first light receiving unit of the plurality of light receiving units is located on an upstream side of the first transport roller pair in the medium transport direction,
A second light receiving unit of the plurality of light receiving units is located on the downstream side of the second transport roller pair in the medium transport direction,
A medium conveying device characterized by the above-mentioned. The medium transport device according to any one of claims 1 to 9,
A processing unit that performs processing on the medium that is transported along the medium transport path,
A medium processing device characterized by the above-mentioned. The medium transport device according to any one of claims 5 to 9,
A processing unit that performs processing on the medium that is transported along the medium transport path,
The transport roller pair is disposed downstream of the processing unit in the medium transport direction,
A medium processing device characterized by the above-mentioned. The medium processing device according to claim 10, wherein the recording device includes a recording unit that performs a recording process on the medium as the processing unit.

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