JP2003266826A - Medium measuring instrument and recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a recorder in which the threshold value of a reflex photosensor can be set easily and a low cost reflex photosensor can be employed. <P>SOLUTION: A dot impact printer having a recording head 18 further comprises a reflex photosensor 41B for detecting information concerning to a sheet medium using a detecting light, and a ribbon mask holder 41 for moving the reflex photosensor 41B in the main scanning direction of the recording head 18 integrally with a carriage 19 and holding it movably in the direction substantially perpendicular to the recording face of the sheet S. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medium measuring device and a recording device, and more particularly to a medium measuring device for measuring a recording medium having various thicknesses and a recording device equipped with the medium measuring device. .

[0002]

2. Description of the Related Art As a recording apparatus, while a carriage equipped with a recording head travels along a platen, an image including characters is recorded on a sheet (medium) conveyed between the recording head and the platen. There is known a dot impact printer for recording.

In a recording device including a dot impact printer, the recording operation is performed within the scanning range of the carriage. By the way, the medium to be recorded (hereinafter,
The shape of the recording medium), in particular, the dimension of the carriage in the scanning direction varies, and the scanning range of the carriage is usually larger than the dimension of the medium in the scanning direction.

Therefore, when the size of the print area corresponding to the recording data exceeds the size of the medium, the printing operation is performed over the entire width of the medium.

As a result, there arises a problem that the platen holding the medium is stained with ink, and the medium set next and the hand of the user are soiled.

In order to avoid such a problem, conventionally, there is known a recording apparatus which is provided with a width detecting device for detecting the width of a set medium and prevents printing from exceeding the size of the medium. ing.

As a width detecting method of the above width detecting device, an optical sensor utilizing reflection is mounted on the carriage, and the width of the medium is detected based on the difference in the amount of reflected light on the medium and on the non-medium. There are ways.

More specifically, Japanese Patent Laid-Open No. 5-327839
In the publication, a preliminary detection operation is performed prior to the paper width detection operation by the paper width sensor provided on the carriage,
A threshold value for detecting the edge of the recording paper is detected. As a result, the threshold value of the paper width sensor is set according to the recording paper to be used, and it is disclosed that appropriate paper width detection can be performed according to the type of recording paper.

[0009]

As described above, according to the technique disclosed in Japanese Patent Laid-Open No. 5-327839, the threshold value of the optical sensor (paper width sensor) is appropriately set in advance in order to accurately measure the shape of the medium. It was necessary to set it to a proper value.

Further, in order to measure the shape of the medium, it is necessary to move the optical sensor in the width direction of the medium. Further, in order to accurately measure the tip position of the medium, it was necessary to install an optical sensor near the recording head.

Therefore, in a recording apparatus (printer) capable of printing on a thick medium such as copy-type paper or passbook, in order to convey a medium having the maximum printable thickness in the recording apparatus. The reflection type optical sensor and the recording head had to be installed at positions apart from the recording surface of the medium.

However, the reflection type optical sensor has a problem in that it is difficult to set the threshold value because the output signal value greatly changes depending on the distance to the measurement object (medium).

Further, the reflection type optical sensor having a large measurable range has a problem of high cost.

Therefore, an object of the present invention is to provide a medium measuring device and a recording device in which the threshold value of a reflection type photosensor can be easily set and a low cost reflection type photosensor can be used. .

[0015]

In order to solve the above-mentioned problems, a medium measuring apparatus used in a recording apparatus having a recording head includes an optical sensor section for detecting information about the medium using detection light, and the optical sensor. And a sensor holding unit for holding the unit in the main scanning direction of the recording head integrally with the carriage and movably in a direction substantially perpendicular to the recording surface of the medium. .

According to the above structure, the sensor holding portion is capable of moving the optical sensor portion integrally with the carriage in the main scanning direction of the recording head, and is also movable substantially perpendicular to the recording surface of the medium. Hold.

As a result, the optical sensor unit moves together with the carriage, and while moving in a direction substantially perpendicular to the recording surface of the medium, detects the information about the medium using the detection light.

In this case, the sensor holder is
It may move in a direction substantially perpendicular to the recording surface of the medium according to the thickness of the medium.

Further, the sensor holding portion includes a slide receiving portion and a slide portion which is slidably supported by the slide receiving portion in the substantially vertical direction and has the optical sensor portion. May be.

Further, the slide receiving portion may include a biasing portion that biases the slide portion toward the recording surface of the medium.

Furthermore, the sensor holding portion may support the optical sensor portion slidably in the substantially vertical direction.

The sensor holding portion may be rotatably supported so as to move the optical sensor portion in the substantially vertical direction.

Further, the sensor holding portion may include a biasing portion that biases the optical sensor portion toward the recording surface of the medium.

Furthermore, the sensor holder may be configured as a mask holder for holding the print ribbon at a predetermined position.

Further, in a recording apparatus in which a recording head mounted on a carriage records an image on a medium on a conveyance path, a conveyance section for conveying the medium and a conveyance section for detecting light are used for conveyance. An optical sensor unit that detects information about the medium, and the optical sensor unit that is movable together with the carriage in the main scanning direction of the recording head and that is movable in a direction substantially perpendicular to the recording surface of the medium. And a recording unit that records the image on the recording surface of the medium based on information about the medium.

According to the above construction, when the medium is conveyed by the conveying section, the optical sensor section held by the sensor holding section moves integrally with the carriage and with respect to the recording surface of the medium. Information about the medium is detected using the detection light while moving in a substantially vertical direction.

Thus, the recording unit records the image on the recording surface of the medium based on the information about the medium.

In this case, the sensor holder is
It may move in a direction substantially perpendicular to the recording surface of the medium according to the thickness of the medium.

Further, the sensor holding portion is provided with a slide receiving portion and a slide portion which is slidably supported by the slide receiving portion in the substantially vertical direction and has the optical sensor portion. May be.

Further, the slide receiving portion may include a biasing portion that biases the slide portion toward the recording surface of the medium.

Furthermore, the sensor holding portion may support the optical sensor portion slidably in the substantially vertical direction.

The sensor holding portion may be rotatably supported so as to move the optical sensor portion in the substantially vertical direction.

Further, the sensor holding portion may include a biasing portion that biases the optical sensor portion toward the recording surface of the medium.

Furthermore, the recording apparatus may be a dot impact type recording apparatus, and the sensor holding section may be configured as a mask holder for holding the print ribbon at a predetermined position.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a dot impact printer according to an embodiment of the present invention. FIG. 2 is a perspective view showing the printer body of the printer of FIG. FIG. 3 shows FIG.
3 is a side sectional view of the printer body of FIG. FIG. 4 is a partial cross-sectional view of the main part of the printer body of FIG.

The dot impact printer 10 prints an image including characters by hitting a large number of recording wires of a recording head onto a sheet through an ink ribbon (both not shown) to record dots.

The printer 10 is roughly classified into a printer body 11, a push tractor unit 12, a case 13,
A sheet supply guide 43 and a control circuit (not shown) are provided.

The printer body 11 is roughly divided into a base frame 14 and a main frame 1 as shown in FIG.
5, left side frame 16, right side frame 17, recording head 18, carriage 19, platen 20, sheet guide 25, first conveying roller 21, second conveying roller 22,
The third transport roller 23 and the fourth transport roller 24 are provided.

The base frame 14 and the main frame 15 function as a main body frame.

As shown in FIG. 2, the left side frame 16 and the right side frame 17 are erected and fixed on substantially both ends of the base frame 14 and the main frame 15.

A lower carriage shaft 26 and an upper carriage shaft 27 (FIG. 3) are bridged between the left side frame 16 and the right side frame 17 at a predetermined distance in the vertical direction. Further, the lower carriage shaft 26 is rotatably supported by the left side frame 16 and the right side frame 17. A platen 20 is laid between the left side frame 16 and the right side frame 17 so as to be rotatable. In addition, left side frame 1
Between the 6 and the right side frame 17, a seat guide 25
Is fixedly provided.

The push tractor unit 12 is detachably mounted on the rear side of the printer body 11 and supplies a continuous sheet to the sheet conveying mechanism section including the platen 20. Here, examples of the continuous sheet include continuous single-sheet paper, continuous copy paper, and the like. The push tractor unit 12 has a pair of left and right tractors 28. The distance between the pair of tractors 28 is
It can be adjusted according to the width dimension of the continuous sheet (continuous paper) to be conveyed.

The tractors 28 are roughly classified into a tractor drive shaft 29, a tractor drive pulley (not shown), a tractor guide shaft (not shown), a tractor driven pulley (not shown),
A tractor belt 31 and a sheet pressing lid 32 are provided.

The tractor drive pulley is the tractor drive shaft 2
9 rotates together with 9, and is axially slidably supported.

The tractor guide shaft supports the tractor driven pulley so as to be rotatable and slidable in the axial direction.

The tractor belt 31 is wound around the tractor drive pulley and the tractor driven pulley. Further, a plurality of pins 33 projectingly provided on the entire outer circumference of the tractor belt 31 are engageable with holes (not shown) formed on both sides in the width direction of the continuous sheet.

The sheet pressing lid 32 presses and guides the sheet from above during the conveyance of the continuous sheet.

The case 13 is roughly divided into an upper case 13A and a lower case 13B. The upper case 13A is arranged so as to cover the upper part of the printer body 11. Further, an operation panel 44 is provided on the upper case 13A. In addition, the lower case 13B,
It is arranged so as to cover the bottom of the printer body 11.

The sheet feeding guide 43 is provided in the printer body 1.
1 is detachably attached to the front side of the sheet 1 and supplies the cut sheet K into the printer body 11. Where cut sheet K
Is a sheet cut into a predetermined length. The cut sheet K is, for example, a single-cut sheet, a single-cut copy paper, or a cut film.

Platen 20, sheet guide 25, first conveying roller 21, second conveying roller 22, third conveying roller 23
The fourth transport roller 24 constitutes a sheet transport mechanism section. The sheet conveying mechanism section is
The first transport roller 21 and the second transport roller 22 are arranged on the front side of the printer body 11. In addition, the sheet transport mechanism unit is configured such that the third transport roller 23 is attached to the platen 20.
The fourth transport roller 24 is arranged on the rear side of the printer body 11. Here, the first transport roller 21 and the second transport roller 21
The conveyance roller 22 is arranged in a vertical direction with respect to the recording surface of the conveyed sheet to form a pair. Similarly, the third
The transport roller 23 and the fourth transport roller 24 are arranged in the up-down direction with respect to the recording surface of the transported sheet to form a pair. Furthermore, the upper portions of the platen 20, the first transport roller 21, and the third transport roller 23 are in a state of protruding above the sheet guide 25. Further, on the front side of the printer main body 11 of the sheet guide 25, a sheet holding plate 37 that holds the sheet with the sheet guide 25 is provided.

The platen 20 is urged toward the recording head 18 by a platen urging member 20A such as a spring.

First transport roller 21, second transport roller 2
The second, third conveying roller 23 and the fourth conveying roller 24 are rotationally driven in the clockwise direction (CW) or the counterclockwise direction (CCW) in FIG. 3 by the drive wheel train portion 34 (FIG. 2). Similarly, the tractor belt 31 of the push tractor unit 12 is driven counterclockwise by the drive wheel train portion 34.

As shown in FIG. 2, the drive wheel train portion 34 is installed on one of the left side frame 16 and the right side frame 17. For example, it is installed on the right side frame 17. The drive train wheel unit 34 includes a motor pinion 36 fixed to a drive shaft (rotating shaft) of a sheet conveying motor 35 that can rotate in the normal direction or the reverse direction. Through the motor pinion 36, the winding transmission mechanism and the gear mechanism, the platen 20, the first
The driving force of the sheet carrying motor 35 is transmitted to the carrying roller 21, the second carrying roller 22, the third carrying roller 23, the fourth carrying roller 24 and the push tractor unit 12.

The cut sheet K is used as the sheet supply guide 43.
Is manually supplied from the front side of the printer body 11 via.

Thereafter, as shown in FIG. 3, the cut sheet K is rotated in the clockwise direction of the first transport roller 21 and the third transport roller 23 and in the counterclockwise direction of the second transport roller 22 and the fourth transport roller 24. By the rotation, the printer body 11 is conveyed from the front side to the rear side in the arrow A direction.

Further, the cut sheet K of the printer main body 11 is rotated by the counterclockwise rotation of the first transport roller 21 and the third transport roller 23 and the clockwise rotation of the second transport roller 22 and the fourth transport roller 24. It is conveyed in the direction of arrow B from the rear to the front.

On the other hand, the continuous sheet is indicated by the arrow B from the rear side of the printer body 11 by the push tractor unit 12.
After being supplied in the direction, the first transport roller 21, the second transport roller 22, the third transport roller 23, and the fourth transport roller 2
4 is conveyed in the direction of arrow B.

As a result, the cut sheet K and the continuous sheet are conveyed in the sub-scanning direction orthogonal to the main scanning direction of the carriage 19 described later.

As shown in FIG. 2, the carriage 19 is slidably inserted into the lower carriage shaft 26 and the upper carriage shaft 27 (FIG. 3). Further carriage 19
Is equipped with a recording head 18. Lower carriage shaft 26
Since the upper carriage shaft 27 and the upper carriage shaft 27 are arranged parallel to the platen 20, the carriage 19 includes the platen 20, the lower carriage shaft 26, and the upper carriage shaft 2.
It is provided so that it can travel (scan) in the main scanning direction that coincides with the axial direction of 7.

The carriage 19 is connected to a timing belt 39 (FIG. 3) which is reciprocally moved by the forward or reverse rotation of the carriage drive motor 38. Therefore, the carriage 19 is guided by the lower carriage shaft 26 and the upper carriage shaft 27 via the timing belt 39 by the forward or reverse rotation of the carriage drive motor 38, and is scanned leftward or rightward in FIG. 2 in the main scanning direction. It Here, the carriage drive motor 38 is configured with the sheet conveyance motor 35, for example, a stepping motor.

Further, the carriage 19 has a structure shown in FIGS.
As shown in FIG. 3, a cartridge holder 40 is provided, and a ribbon cartridge (both not shown) accommodating an ink ribbon is attached to the cartridge holder 40. Further, the carriage 19 is provided with a ribbon mask holder 41 that protects the ink ribbon in the ribbon cartridge from a sheet (cut sheet K or continuous sheet) conveyed in contact with the upper peripheral surface of the platen 21. The ink ribbon in the ribbon cartridge is stored in the cartridge holder 4
With the ribbon winding shaft 42 installed at 0, the recording head 1
It is provided movably in front of the recording wire 8.

The recording head 18 has a large number of recording wires (not shown). The recording head 18 includes a carriage 19
While being scanned in the main scanning direction, the recording wire is projected based on the recording image and hits the ink ribbon.
As a result, the ink of the ink ribbon is attached to the sheet (cut sheet K or continuous sheet) conveyed between the platen 20 and the recording head 18, and an image including characters is recorded on this sheet.

The recording operation by the recording head 18 is performed by the recording wire of the recording head 18 while the carriage 19 is scanned in the main scanning direction (left direction or right direction in FIG. 2).

When a sheet is a cut sheet K every time printing is performed by one scan, the sheet conveying mechanism section (platen 20, first conveying roller 21, second conveying roller 22, third conveying roller) Roller 23 and fourth transport roller 2
4) conveys the sheet for a predetermined length (usually the space between lines).

Similarly, when the sheet is a continuous sheet, the above-described sheet conveying mechanism section and the push tractor unit 12 respectively convey the sheet for a predetermined length (for a normal space).

Then, an image is formed by repeating the recording operation and the corresponding sheet conveying operation.

Here, referring to FIG. 4, the recording head 1
8, the detailed configuration around the carriage 19 and the ribbon mask holder 41 will be described.

The ribbon mask holder 41 is roughly classified into
The holder main body 41A, the reflection type optical sensor 41B and the sliding member 41C are provided.

The holder body 41A holds an ink ribbon (not shown) at a predetermined position with respect to the recording head 18, and suppresses the lifting of the sheet S.

The reflection type optical sensor 41B irradiates the sheet S with detection light and outputs a detection signal corresponding to the presence or absence of the reflected light by the sheet S to a control circuit (not shown). In this case, the reflection type optical sensor 41B is provided at a predetermined position in FIG. 4 such that the distance from the lower surface of the ribbon mask holder 41 is optimum for detecting the sheet S.

The sliding member 41C is erected substantially vertically to the holder body 41A and has a cylindrical shape with one end closed.

On the other hand, inside the carriage 19, there is provided a slide receiving portion 19A for slidably accommodating the slide member 41 of the ribbon mask holder 41. A guide member 19B, which is inserted into the sliding member 41C and guides the sliding member 41C, is provided in the sliding receiving portion 19A. Further, in the space formed between the guide member 19B and the inner wall of the sliding member 41C, the end surface of the guide member 19B supports the sliding member 41C and functions as a biasing portion that biases the sliding member 41C toward the sheet S. A biasing spring 19C is stored. In this case, the urging force of the urging spring 19C is set so that the sheet S can move toward the recording head 18 when the sheet S is inserted. As a result, the ribbon mask holder 41 is biased in the arrow XD direction and is held by the slide receiving portion 19A so as to be movable in the arrow XU direction when the sheet S is inserted.

When the sheet S is not inserted on the lower surface side of the ribbon mask holder 41, the holder body 41A is
The urging spring 19C urges the platen 20 so as to substantially contact the platen 20. As described above, the urging force of the urging spring 19C is set so that it can be moved to the recording head 18 side by the sheet when the sheet is inserted.
When the sheet is conveyed by the first and second conveying rollers 22, the sheet moves in the arrow XU direction according to the thickness of the conveyed sheet.

At this time, since the reflection type optical sensor 41B is provided at a predetermined position where the distance from the lower surface of the ribbon mask holder 41 is optimum for detection, the sheet S which is in contact with the ribbon mask holder 41. The distance from the upper surface of is also the optimum position for detection.

In this state, when the carriage 19 is scanned in the main scanning direction, a detection signal corresponding to the presence / absence of a sheet is output to a control circuit (not shown).

As a result, the control circuit (not shown) can detect the length of the sheet S in the main scanning direction, that is, the width of the sheet S and the presence or absence of the sheet S.

Further, when the control circuit detects that the sheet S is properly inserted, it appropriately sets the drive range of the carriage 19, that is, the drive range of the recording head 18 in the main scanning direction, High-speed printing can be performed by eliminating unnecessary movement of the carriage. As described above, according to the present embodiment, since the reflective optical sensor 41B is provided at a position corresponding to the change in the thickness of the sheet to be printed, the detection position is stable and the sheet detection accuracy is improved. Can be improved.

Further, from the top surface of the sheet, the reflection type optical sensor 41
Since the distance to B can always be almost constant,
The detection threshold value in the reflective optical sensor 41B can be easily set.

Although the present invention has been described above based on the embodiment, the present invention is not limited to this, and the following modifications are possible.

In the above embodiment, the ribbon mask holder 41 is moved in a direction substantially perpendicular to the recording surface of the sheet S, and the reflection type optical sensor integrally formed on the ribbon mask holder 41 is attached to the recording surface of the sheet S. It was configured to move in a substantially vertical direction with respect to.

However, the ribbon mask holder 41 is fixed to the carriage 19 and the reflection type optical sensor 41 is used.
It is also possible to move B in a direction substantially perpendicular to the recording surface of the sheet S.

More specifically, as shown in FIG. 5, the ribbon mask holder 41 is fixed to the carriage 19, and the reflection type optical sensor 41B is attached to the ribbon mask holder 41 in a direction substantially perpendicular to the recording surface of the sheet S. A slide receiving portion 41F that slidably holds the slide receiving portion 41F may be provided. In this case, the slide receiving portion 41F has a biasing spring 41G that biases the reflective optical sensor 41B toward the platen 20 in order to keep the distance from the recording surface of the sheet S of the reflective optical sensor 41B constant. is doing. Further, in order to optimize the distance between the sheet S and the reflection type optical sensor 41B at the time of measurement as needed, the sheet S and the reflection type optical sensor 41B are directly or indirectly through a spacer (not shown). It should be in contact.

Also in this case, as in the above-described embodiment, the biasing force of the biasing spring 41G is set so that it can be moved to the recording head 18 side by the sheet when the sheet is inserted. The distance between the upper surface of the sheet S and the upper surface of the sheet S is also the position that is optimum for detection.

Further, in the above embodiment, the reflection type optical sensor 41B is moved in a direction substantially perpendicular to the recording surface of the sheet S.

However, the reflection type optical sensor 41B may be configured to move in a direction other than the substantially vertical direction such as an oblique direction within the specification range of the reflection type optical sensor 41B with respect to the recording surface of the sheet. is there.

More specifically, as shown in FIG. 6, the ribbon mask holder 41H includes a support member 41I and a pin 41.
It is rotatably attached via J. The reflection type optical sensor 41 is provided at a predetermined position on the tip side of the support member 41I.
B is provided. In this case, in order to optimize the distance between the sheet S and the reflection type optical sensor 41B at the time of measurement, the sheet S and the reflection type optical sensor 41B directly or indirectly contact each other through a spacer (not shown). You can do it like this.

As a result, when the sheet is inserted while the support member 41I is urged counterclockwise in FIG. 6 by its own weight or by an urging member (for example, urging spring) not shown, By rotating in the clockwise direction, the reflection-type optical sensor 4 according to the thickness of the inserted sheet.
1B can be set to the position that is most suitable for detection.

Also in this case, as in the above-described embodiment, the self-weight of the support member 41I or the urging force of the urging member (not shown) should be set so as to be movable toward the recording head 18 by the sheet when the sheet is inserted. Thus, the distance between the reflective optical sensor 41B and the upper surface of the sheet S is also the position that is most suitable for detection.

When the reflective optical sensor 41B moves in a direction other than the substantially vertical direction (for example, diagonally upward), the detection position of the reflective optical sensor 41B is substantially perpendicular to the recording surface of the sheet. It may be configured to move in the direction.

In the above description, the case of the dot impact printer as the recording device has been described as an example.
It can also be applied to various recording devices having a recording head and a carriage such as a thermal recording printer and an inkjet printer.

[0092]

According to the present invention, the optical sensor portion for detecting information about the medium is movable integrally with the carriage while being movable in a direction substantially perpendicular to the recording surface of the medium. It is possible to select the optimum position as the detection position. Further, it does not hinder the conveyance of the medium.

In this case, the distance from the recording surface of the medium can be kept constant by moving the optical sensor section to a position corresponding to the thickness of the medium, and the threshold value for detection of the optical sensor section can be maintained. Can be easily set.

[Brief description of drawings]

FIG. 1 is a perspective view showing a dot impact printer to which an embodiment of a recording apparatus according to the present invention is applied.

FIG. 2 is a perspective view showing a printer body of the printer of FIG.

FIG. 3 is a side view of the printer body of FIG.

FIG. 4 is a detailed configuration diagram around a ribbon mask holder of the printer of FIG.

FIG. 5 is an explanatory diagram of a modified example.

FIG. 6 is an explanatory diagram of another modification.

[Explanation of symbols]

10 dot impact printer (recording device) 11 Printer body 18 recording head 19 carriage 19A Sliding receiving part 19B guide member 19C bias spring (biasing part) 20 Platen 41 Ribbon mask holder 41A holder body 41B reflective optical sensor 41C Sliding member (sliding part) 41F Sliding receiving part 41G bias spring (biasing part) 41H Ribbon mask holder 41I support member 41J pin

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2C058 AB18 AC04 AC11 AE03 AE09                       AE12 AF49 KA07 KA18 KA23                       KA29                 2F065 AA22 BB01 CC02 MM03 PP22                       QQ08                 3F048 AA05 AB01 BA06 BB02 CA02                       DA08 DC14

Claims (16)

[Claims] 1. A medium measuring apparatus used in a recording apparatus having a recording head, wherein an optical sensor section for detecting information about the medium using detection light, and the optical sensor section being a carriage in a main scanning direction of the recording head. A medium measuring device comprising: a sensor holding unit that is movable as a unit and that is movable in a direction substantially perpendicular to the recording surface of the medium. 2. The medium measuring device according to claim 1, wherein the sensor holder moves in a direction substantially perpendicular to a recording surface of the medium according to a thickness of the medium. apparatus. 3. The medium measuring device according to claim 1, wherein the sensor holding portion is supported by a slide receiving portion and the slide receiving portion so as to be slidable in the substantially vertical direction. A medium measuring device comprising: a sliding part having an optical sensor part; 4. The medium measuring device according to claim 3, wherein the sliding receiving portion includes a biasing portion that biases the sliding portion toward a recording surface of the medium. measuring device. 5. The medium measuring device according to claim 1, wherein the sensor holding unit supports the optical sensor unit slidably in the substantially vertical direction. 6. The medium measuring device according to claim 1, wherein the sensor holding unit rotatably supports the optical sensor unit so as to move the optical sensor unit in the substantially vertical direction. 7. The medium measuring device according to claim 5, wherein the sensor holding unit includes a biasing unit that biases the optical sensor unit toward a recording surface of the medium. Measuring device. 8. The medium measuring device according to claim 1, wherein the sensor holding portion is configured as a mask holder that holds the print ribbon at a predetermined position. measuring device. 9. A recording head mounted on a carriage,
In a recording device for recording an image on a medium on a transport path, a transport section for transporting the medium, an optical sensor section for detecting information on the medium transported by the transport section using detection light, and the optical sensor A sensor holding unit that holds the unit integrally with the carriage in the main scanning direction of the recording head, and that is movable in a direction substantially perpendicular to the recording surface of the medium, and based on information about the medium, A recording apparatus comprising: a recording unit that records the image on a recording surface of the medium. 10. The recording apparatus according to claim 9, wherein the sensor holding unit moves in a direction substantially perpendicular to a recording surface of the medium according to the thickness of the medium. 11. The recording apparatus according to claim 9, wherein the sensor holding portion is slidably supported by the sliding receiving portion and the sliding receiving portion in the substantially vertical direction. A recording device, comprising: a sliding part having a sensor part. 12. The recording apparatus according to claim 11, wherein the slide receiving portion includes a biasing portion that biases the sliding portion toward a recording surface of the medium. . 13. The recording apparatus according to claim 9, wherein the sensor holding portion supports the optical sensor portion slidably in the substantially vertical direction. 14. The recording apparatus according to claim 9, wherein the sensor holding portion rotatably supports the optical sensor portion so as to move the optical sensor portion in the substantially vertical direction. 15. The recording apparatus according to claim 13 or 14, wherein the sensor holding unit includes a biasing unit that biases the optical sensor unit toward a recording surface of the medium. Recording device. 16. The recording apparatus according to claim 9, wherein the recording apparatus is a dot impact type recording apparatus,
The recording device, wherein the sensor holding portion is configured as a mask holder that holds the print ribbon at a predetermined position.