JP2021020751A - Medium floating detection sensor and printer including the same - Google Patents

Abstract

To provide a medium floating detection sensor which can accurately specify a position where the floating of a medium occurs and is also easily set.SOLUTION: A medium floating detection sensor 50 comprises: a support base 13 which supports a medium 5; a light source 60; an irradiation angle adjustment device 70 which changes the irradiation angle of the light; an irradiation angle measurement device which measures the irradiation angle; a first light-receiving device 91 which receives the reflection light from the medium 5; and a control device. The control device registers a first irradiation angle θ1 at which the reflection light is reflected toward the first light-receiving device 91 and a first light reception amount. The control device determines that the medium 5 is apart from the support base 13 at a detection point P1 when the light reception amount of the first light-receiving device 91 is lower than the first light reception amount in a state where the irradiation angle measured by the irradiation angle measurement device matches the first irradiation angle θ1.SELECTED DRAWING: Figure 4

Description

The present invention relates to a media float detection sensor and a printer including the same.

Conventionally, a printer including a support base for supporting the media, a transport device for sending out the media, and a recording head for printing on the media has been known. In such a printer, the recording head forms an image on the media while continuously or intermittently feeding the media in the transport direction.

In the printer as described above, when the media is sent out, a part of the media may bend and be lifted from the support base. If a part of the media is lifted from the support base, problems such as contact between the recording head and the media may occur. Such contact can be prevented by providing the printer with a sensor that detects the floating of the media.

Patent Document 1 discloses a printer including a reflective optical sensor that detects floating of media. The reflective optical sensor disclosed in Patent Document 1 irradiates the media with light obliquely and detects the specularly reflected light on the media. When the media floats at the detection point where the light is irradiated, the light is not specularly reflected at the detection point, and the amount of light received by the reflective optical sensor becomes small. The printer disclosed in Patent Document 1 detects the floating of media by utilizing the amount of light received by the reflective optical sensor.

The sensor that detects the floating of the media is not limited to the above-mentioned one, but the reflection type optical sensor as disclosed in Patent Document 1 has some advantages. One advantage is that unlike contact sensors, it can detect media floats in a non-contact manner. Another advantage is that since the optical path is fixed, the position where the media is lifted can be identified. Yet another advantage is that since the specularly reflected light is used, the amount of light received in the normal state is large, and the amount of light received is greatly reduced when the media floats. Therefore, the risk of false positives is small. For example, in the case of a sensor that detects the floating of media by using diffusely reflected light, the position where the floating of the media occurs can be roughly specified, and there is a high risk of false detection.

Japanese Unexamined Patent Publication No. 2006-240138

However, in the media floating detection sensor as disclosed in Patent Document 1, high accuracy is required for setting the optical path of light for detecting the floating of the media. Unless the light emitted from the light source is reflected by the media and reaches the light receiving device, the sensor that detects the floating of the media by the reflected light by the media cannot be established. Therefore, accuracy is required for the mounting position of the light source, the tilt angle of the light source, the mounting position of the light receiving device, and the like. Attempting to set these with high accuracy leads to an increase in labor and time related to the setting, or an increase in cost due to an improvement in component accuracy.

The present invention has been made in view of the above points, and an object of the present invention is to provide a media float detection sensor that can accurately identify the position where media float occurs and is easy to set. Another object of the present invention is to provide a printer provided with such a media float detection sensor.

The media floating detection sensor disclosed herein includes a support base that supports the media, a light source that generates light, an irradiation angle adjusting device that changes the irradiation angle at which the light is applied to the support base, and the irradiation angle. It includes an irradiation angle measuring device for measuring, a first light receiving device that receives the light that is irradiated to the first point of the media via the irradiation angle adjusting device and reflected at the first point, and a control device. ..
The control device includes a first irradiation angle registration unit, a first light reception amount registration unit, a light source control unit, a first light reception amount acquisition unit, an irradiation angle control unit, and a first determination unit. .. The first irradiation angle, which is the irradiation angle, is registered in the first irradiation angle registration unit so that the light is irradiated to the first point of the medium and reflected toward the first light receiving device. .. In the first light receiving amount registration unit, the first light receiving amount relating to the light receiving amount of the first light receiving device is registered. The light source control unit controls the light source to generate the light. The first light receiving amount acquisition unit acquires the light receiving amount of the first light receiving device. The irradiation angle control unit controls the irradiation angle adjusting device to change the irradiation angle. The first determination unit is the first light receiving device in a state where the light source generates the light and the irradiation angle measured by the irradiation angle measuring device matches the first irradiation angle. When the light receiving amount is less than the first light receiving amount, it is determined that the media is separated from the support base at the first point.

According to the media floating detection sensor, the first light receiving device can be irradiated with the reflected light reflected by the media by changing the irradiation angle of the light with the irradiation angle adjusting device. Whether or not the reflected light is applied to the first light receiving device can be easily determined by comparing the light receiving amount of the first light receiving device with the first light receiving amount as a threshold value. The irradiation angle when the first light receiving device is irradiated with the light reflected by the medium can be easily specified by the irradiation angle measuring device and can be reproduced. Further, since the optical path of the light received by the first light receiving device is specified, the detection position (first position) can be specified with high accuracy. Therefore, according to the media float detection sensor, the position where the media float occurs can be accurately identified, and the setting is easy.

It is a front view of the inkjet printer which concerns on one Embodiment. It is sectional drawing which looked at the main part of a printer from the right side. It is a right side view which shows typically the structure of the media float detection sensor. It is a right side view which shows the structure of the media float detection sensor schematically, and is the figure which showed 5 detection points. It is a block diagram of a media float detection sensor. It is a graph which shows the relationship between the rotation angle of the rotation axis in a correction mode, and the light receiving amount of the 1st light receiving device. It is a graph which shows the relationship between the rotation angle of the rotation axis in a detection mode, and the light receiving amount of the 1st light receiving device. It is a graph which shows the relationship between the rotation angle of the rotation axis in a detection mode, and the light receiving amount of a 2nd light receiving device. It is a graph which shows the relationship between the rotation angle of the rotation axis in a detection mode, and the light receiving amount of a 3rd light receiving device. It is a graph which shows the relationship between the rotation angle of the rotation axis in a detection mode, and the light receiving amount of the 4th light receiving device. It is a graph which shows the relationship between the rotation angle of the rotation axis in a detection mode, and the light receiving amount of the 5th light receiving device. It is a top view which shows typically the optical path of the light path of a plurality of reflecting surfaces and a plurality of reflecting surfaces. It is a graph which shows an example of the relationship between the rotation angle of the rotation shaft and the light receiving amount of the 1st light receiving device in the correction mode which concerns on 2nd Embodiment. It is a block diagram of the media float detection sensor which concerns on 3rd Embodiment. It is a right side view which shows typically the 1st irradiation angle which concerns on a 1st medium and the 1st irradiation angle which concerns on a 2nd medium.

(First Embodiment)
Hereinafter, some embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an inkjet printer (hereinafter referred to as a printer) 10 according to an embodiment. FIG. 2 is a cross-sectional view of the main part of the printer 10 as viewed from the right side. In the following description, left, right, top, and bottom mean left, right, top, and bottom as seen by the user in front of the printer 10. Further, the side approaching the user from the printer 10 is the front side, and the side away from the printer 10 is the rear side. The symbols F, Rr, L, R, U, and D in the drawings represent front, rear, left, right, top, and bottom, respectively. The reference numeral Y in the drawing represents the scanning direction. In the present embodiment, the scanning direction Y is the left-right direction. In the following, the left side of the scanning direction Y may be represented by a code of Y1 and the right side may be represented by a code of Y2. Reference numeral X in the drawing represents a transport direction. The transport direction X is a direction orthogonal to the scanning direction Y (here, a direction orthogonal to the scanning direction Y). The transport direction X is the front-rear direction. In the following, in the transport direction X, the rear part may be represented by the symbol X1 and the front part may be represented by the symbol X2. However, the above direction is only for convenience and should not be interpreted in a limited way.

The printer 10 prints on the medium (recording medium) 5. The media 5 is used, for example, formed in a long length and wound in a roll shape. However, the media 5 is not limited to the roll shape. The media 5 may be in the form of a sheet. Further, the material of the media 5 is not particularly limited. The material of the media 5 may be paper or another material.

The printer 10 includes a casing 11, legs 12 that support the casing 11, a platen 13, a carriage 20, a recording head 21 provided on the carriage 20, a carriage moving device 30, and a conveying device 40 that conveys the media 5. , Is equipped.

The platen 13 is an example of a support base that supports the media 5. The platen 13 extends in the scanning direction Y and the transport direction X orthogonal to the scanning direction Y. The media 5 is conveyed on the platen 13 in the transfer direction X by the transfer device 40. The media 5 is basically conveyed from the rear (X1 side) to the front (X2 side) during printing. Hereinafter, the X1 direction is also referred to as an upstream direction of the transport direction X, and the X2 direction is also referred to as a downstream direction of the transport direction X.

The carriage moving device 30 includes a guide rail 31, a pair of pulleys 32 and 33, a belt 34, and a scan motor 35. The guide rail 31 extends in the scanning direction Y. The carriage 20 is slidably engaged with the guide rail 31. A pulley 32 is arranged on the left side of the platen 13, and a pulley 33 is arranged on the right side of the platen 13. A scan motor 35 is connected to the pulley 33. An endless belt 34 is wound around the pulley 32 and the pulley 33. The carriage 20 is attached to the belt 34. When the scan motor 35 drives the pulley 33, the belt 34 travels and the carriage 20 moves along the guide rail 31 in the scanning direction Y.

The carriage 20 is provided with a recording head 21. The recording head 21 prints an image on the media 5 on the platen 13. Here, the recording head 21 prints on the media 5 by ejecting ink on the media 5. The number of recording heads 21 provided on the carriage 20 is not particularly limited, but here, four recording heads 21 are mounted on the carriage 20. The recording head 21 moves in the scanning direction Y together with the carriage 20. Although not shown, a plurality of nozzles for ejecting ink are formed on the lower surface of the recording head 21.

The transport device 40 transports the media 5 in the transport direction X. As shown in FIG. 2, the transport device 40 includes a grit roller 41, a pinch roller 42, and a feed motor 43 for rotating the grit roller 41. The pinch roller 42 and the grit roller 41 face each other. The media 5 is conveyed to the front X2 or the rear X1 by rotating the grit roller 41 with the media 5 sandwiched between the pinch roller 42 and the grit roller 41.

When the transport device 40 transports the media 5, a part of the media 5 may bend and float from the platen 13. In other words, upwardly convex wrinkles may occur on the media 5. The floating of the media 5 occurs, for example, when the media 5 is sandwiched between the grit roller 41 and the pinch roller 42 in order to convey the media 5. Alternatively, the floating of the media 5 also occurs, for example, when the ink lands on the media 5 during printing and the media 5 swells with the ink. The printer 10 according to the present embodiment includes a media float detection sensor 50 that detects the lift of the media 5 from the platen 13. In the following, the fact that the media 5 is raised from the platen 13 is also referred to as "the media 5 is separated from the platen 13", and the fact that the media 5 is not raised from the platen 13 is "the media 5 is raised from the platen 13". Is in contact with. "

In this embodiment, as shown in FIG. 1, the media float detection sensor 50 is provided on the carriage 20. Specifically, as shown in FIG. 1, the media float sensor 50 is provided on the left side surface and the right side surface of the carriage 20. The media floating detection sensor 50 provided on the left side surface of the carriage 20 has the same configuration as the media floating detection sensor 50 provided on the right side surface of the carriage 20. However, the media floating detection sensor 50 provided on the left side surface of the carriage 20 and the media floating detection sensor 50 provided on the right side surface may be configured symmetrically with the carriage 20 in between, for example.

In the present embodiment, the media floating detection sensor 50 detects the floating of the media 5 at five detection points arranged along the transport direction X. As shown in FIG. 2, the media floating detection sensor 50 is arranged at five locations arranged along the transport direction X by utilizing the light receiving state of the first light receiving device 91 to the fifth light receiving device 95 (details will be described later). The floating of the media 5 at the detection point is detected. Further, the media floating detection sensor 50 detects the floating of the media 5 at five detection points arranged along the transport direction X while moving in the main scanning direction Y together with the carriage 20. The floating detection of the media 5 is performed by the media floating detection sensor 50 on the front side in the traveling direction of the carriage 20. As a result, the floating of the media 5 can be detected before the carriage 20 passes through the raised point of the media 5. However, the position, number, arrangement direction, etc. of the detection points of the media float detection sensor 50 are not limited.

FIG. 3 is a right side view schematically showing the configuration of the media float detection sensor 50. FIG. 4 is a right side view schematically showing the configuration of the media float detection sensor 50, and is a diagram showing five detection points P1 to P5. As shown in FIG. 3, the media floating detection sensor 50 includes a light source 60, an irradiation angle adjusting device 70, an irradiation angle measuring device 80, first light receiving devices 91 to fifth light receiving devices 95, and a control device 100 (FIG. 3). 5) and. The control device 100 may be integrated with the control device of the printer 10 or may be a separate body. The media floating detection sensor 50 according to the present embodiment detects the presence or absence of floating of the media 5 by irradiating the media 5 with light and measuring the reflected light.

The light source 60 generates light for detecting the floating of the media 5. The light source 60 is, here, a red semiconductor laser generator that irradiates a red laser beam. The light source 60 is preferably one that generates highly directional light such as laser light. Further, the light source 60 is preferably one that produces light in a narrow wavelength band such as red, rather than one that produces light in a wide wavelength band such as white light. However, the light generated by the light source 60 is not particularly limited. The light generated by the light source 60 may be given directivity by, for example, an optical mechanism such as a slit or a pinhole. Further, the light generated by the light source 60 may be, for example, a light having a wide wavelength band passed through a filter that cuts light other than the light having a specific wavelength band.

As shown in FIG. 3, an irradiation angle adjusting device 70 is provided downstream of the light source 60 in the transport direction (X2 side). The irradiation angle adjusting device 70 is configured to change the angle at which the light generated by the light source 60 is applied to the platen 13 (hereinafter, referred to as an irradiation angle θ). As shown in FIG. 3, in the present embodiment, the irradiation angle θ is represented as the angle of the optical path Op with respect to the media 5 in the side view (scanning direction Y view). Although not shown, the optical path Op is substantially parallel to the transport direction X in a plan view (vertical view when the direction orthogonal to the transport direction X and the scanning direction Y is the vertical direction). As shown in FIG. 3, the irradiation angle adjusting device 70 includes a driving unit 71 and a polygon mirror 72.

The drive unit 71 includes a rotation shaft 71a extending in the scanning direction Y and a rotation motor 71b. The rotary motor 71b rotates the rotary shaft 71a. The rotary motor 71b is electrically connected to the control device 100 and is controlled by the control device 100. The rotary motor 71b may be a high-performance motor having a very stable rotation speed, but may be an inexpensive motor in which the rotation speed is not so stable and the rotation speed is uneven.

The polygon mirror 72 is connected to the rotation axis 71a. The polygon mirror 72 is rotated around the rotation axis 71a by the drive unit 71. The polygon mirror 72 is formed in a polygonal columnar shape which is a polygon in a side view. Here, the side surface 72s of the polygon mirror 72 is formed in a regular decagon. The side surface 72s is a surface perpendicular to the platen 13. Reflecting surfaces 72a to 72j extending in the scanning direction Y are connected to the 10 sides of the side surface 72s, respectively. The light generated by the light source 60 is applied to the reflecting surfaces 72a to 72j and reflected by the reflecting surfaces 72a to 72j. The plurality of reflecting surfaces 72a to 72j are configured to reflect the light generated by the light source 60. Although not shown, on the left side of the side surface 72s, another side surface facing the side surface 72s and having the same shape as the side surface 72s is provided. The polygon mirror 72 is formed in a regular pentagonal prism. Here, the rotation shaft 71a is connected to the center of the side surface 72s, and the polygon mirror 72 rotates around the center. The driving unit 71 changes the light irradiation angle θ by changing the directions of the reflecting surfaces 72a to 72j.

The polygon mirror 72 is made of resin here. Each of the reflecting surfaces 72a to 72j is formed by attaching a light-reflecting film F1 to the surface of the polygon mirror 72. The film F1 here is a red film. The film F1 reflects red light with a higher reflectance than light of other colors. Therefore, the film F1 looks red. The film F1 is a material that reflects light in the wavelength band (here, red light) generated by the light source 60 with a higher reflectance than light in other wavelength bands.

The irradiation angle measuring device 80 measures the irradiation angle θ of light. Here, the irradiation angle measuring device 80 indirectly measures the irradiation angle θ by measuring the rotation angle θr of the rotation axis 71a of the irradiation angle adjusting device 70. Here, the irradiation angle measuring device 80 is a rotary encoder that measures the rotation angle θr of the rotation shaft 71a. In the present embodiment, the light source 60 is provided on the upstream X1 side of the transport direction X with respect to the polygon mirror 72, and among the trajectories of the plurality of reflecting surfaces 72a to 72j when the polygon mirror 72 is rotated by the drive unit 71. Irradiate light toward a predetermined point of. At that time, the light source 60 irradiates light so as to be orthogonal to the scanning direction Y (in other words, parallel to the transport direction X in a plan view). The incident angle θw (angle with respect to the platen 13) at which the light source 60 irradiates light toward the polygon mirror 72 and the target position are fixed when the light source 60 is set. Therefore, the irradiation angle θ with respect to the transport direction X changes according to the rotation angle θr of the rotation shaft 71a, and is determined by the rotation angle θr of the rotation shaft 71a. Therefore, the irradiation angle θ can be indirectly measured by measuring the rotation angle θr of the rotation shaft 71a. The irradiation angle measuring device 80 is electrically connected to the control device 100 and transmits a signal relating to the rotation angle θr to the control device 100.

Note that "measuring the irradiation angle θ" means not only actually measuring or calculating the irradiation angle θ, but also other physical quantities corresponding to the irradiation angle θ and 1: 1 (in the present embodiment, the rotation angle θr). ) Is included. At that time, it is not always necessary to calculate the irradiation angle θ. In the process relating to the irradiation angle θ, the rotation angle θr may be used as it is.

As shown in FIG. 4, the first light receiving devices 91 to the fifth light receiving devices 95 are generated by the light source 60 and are different from each other on the media 5 via the irradiation angle adjusting device 70 (here, the first points P1 to P1). The fifth point P5) is irradiated, and the light reflected at the first point P1 to the fifth point P5 is received. The first point P1 to the fifth point P5 are the floating detection points of the media 5. The first point P1 to the fifth point P5 are arranged in the transport direction X of the media 5. As shown in FIG. 4, when the irradiation angle θ of the light is set to the first irradiation angle θ1 to the fifth irradiation angle θ5 by the irradiation angle adjusting device 70, the optical paths of the light are the first optical path Op1 to the fifth optical path Op5, respectively. Draw. At that time, the light is applied to the first point P1 to the fifth point P5, respectively.

The first light receiving devices 91 to the fifth light receiving devices 95 receive the specularly reflected light at the first point P1 to the fifth point P5, respectively. When the media 5 is floating at a certain detection point (for example, the first point P1), the reflection of light at the detection point is disturbed. As a result, the amount of light received by the light receiving device (first light receiving device 91 in the above example) that receives the specularly reflected light at the detection point is reduced. As a result, it is detected that the media 5 is floating at the detection point. The first detection point P1 is set on the front X2 side of the front end of the recording head 21, and the fifth detection point P5 is set on the rear X1 side of the rear end of the recording head 21. As a result, the presence or absence of floating of the media 5 is detected in the region including the entire recording head 21 with respect to the transport direction X.

The first light receiving device 91 to the fifth light receiving device 95 are configured to selectively measure the amount of light received in a specific wavelength band. Specifically, the first light receiving device 91 to the fifth light receiving device 95 selectively selects red light generated by the light source 60 and reflected more strongly than light in other wavelength bands on the reflecting surfaces 72a to 72j of the polygon mirror 72. Measure. The first light receiving devices 91 to the fifth light receiving devices 95 are electrically connected to the control device 100, and transmit signals related to the respective light receiving amounts to the control device 100.

The control device 100 controls the operation of each part of the media float detection sensor 50. FIG. 5 is a block diagram of the media float detection sensor 50. As shown in FIG. 5, the control device 100 is connected to the light source 60, the rotary motor 71b of the irradiation angle adjusting device 70, the irradiation angle measuring device 80, and the first light receiving device 91 to the fifth light receiving device 95. There is. The configuration of the control device 100 is not particularly limited. The control device 100 is, for example, a microcomputer. The hardware configuration of the microcomputer is not particularly limited, but for example, an interface (I / F) for receiving execution data from an external device such as a host computer and a central processing unit (CPU: CPU) for executing control program instructions. Central processing unit), ROM (read only memory) that stores programs executed by the CPU, RAM (random access memory) that is used as a working area for deploying programs, memory that stores programs and various data, etc. It is equipped with a storage device. As described above, the function of the control device 100 may be realized by the control device of the printer 10.

As shown in FIG. 5, the control device 100 includes a mode selection unit 110, a correction unit 120, an irradiation angle registration unit 170, a light receiving amount registration unit 180, a light source control unit 190, and an irradiation angle control unit 200. It includes a light receiving amount acquisition unit 210 and a determination unit 220.

The mode selection unit 110 is configured so that one of the correction mode and the detection mode can be selected. However, the mode selection unit 110 may be configured so that other modes can be selected. The correction mode is a mode for correcting the optical paths Op1 to Op5 (see FIG. 4) of the light received by the first light receiving device 91 to the fifth light receiving device 95. More specifically, in the correction mode, the first rotation angle θr1 to the fifth rotation angle θr5 of the rotation shaft 71a (see FIGS. 7A to 7E, respectively) are corrected. As a result, the first irradiation angles θ1 to 5th irradiation angles θ5 are corrected, and the trajectories of the first optical path Op1 to the fifth optical path Op5 are corrected accordingly. When the first rotation angle θr1 to the fifth rotation angle θr5 are not registered, the correction mode is a mode for setting the first rotation angle θr1 to the fifth rotation angle θr5. In the detection mode, the floating of the media 5 at the first point P1 to the fifth point P5 is detected.

The correction unit 120 corrects the trajectories of the first optical path Op1 to the fifth optical path Op5 in the correction mode. As shown in FIG. 5, the correction unit 120 includes a correction irradiation angle control unit 130, a correction light source control unit 140, a correction light reception amount acquisition unit 150, and a setting unit 160.

The irradiation angle control unit 130 at the time of correction controls the irradiation angle adjusting device 70 in the correction mode to change the irradiation angle θ. In the present embodiment, the correction irradiation angle control unit 130 is set to rotate the rotary motor 71b at a constant speed. Therefore, when light is irradiated on one reflecting surface (for example, the first reflecting surface 72a), the irradiation angle θ changes continuously. When the light irradiation position of the polygon mirror 72 moves from one reflection surface (for example, the first reflection surface 72a) to another reflection surface (for example, the second reflection surface 72b), the irradiation angle θ is , Change intermittently. However, the correction irradiation angle control unit 130 may be set so as to intermittently rotate the rotary motor 71b to intermittently change the irradiation angle θ.

The light source control unit 140 at the time of correction controls the light source 60 in the correction mode to generate light. Here, the correction light source control unit 140 is set to continuously generate light during the correction operation.

The light receiving amount acquisition unit 150 at the time of correction is configured to acquire the light receiving amount of the first light receiving device 91 to the fifth light receiving device 95 in the correction mode. As shown in FIG. 5, the corrected light receiving amount acquisition unit 150 includes first acquisition units 151 to fifth acquisition units 155. In the first acquisition unit 151, the first light receiving device 91 is in a state where the correction irradiation angle control unit 130 changes the light irradiation angle θ and the correction light source control unit 140 generates light. Acquire the amount of received light. Here, the first acquisition unit 151 continuously acquires the amount of light received by the first light receiving device 91 during the correction operation. Similarly, the second acquisition unit 152 acquires the amount of light received by the second light receiving device 92. The third acquisition unit 153 acquires the amount of light received by the third light receiving device 93. The fourth acquisition unit 154 has acquired the amount of light received by the fourth light receiving device 94. The fifth acquisition unit 155 acquires the amount of light received by the fifth light receiving device 95.

In the setting unit 160, the irradiation angle θ measured by the irradiation angle measuring device 80 (the rotation angle θr is actually measured) and the first acquired by the first acquisition unit 151 to the fifth acquisition unit 155, respectively. The first irradiation angle θ1 to the fifth irradiation angle θ5 are set based on the light receiving amount of the light receiving devices 91 to 5th light receiving device 95. As shown in FIG. 5, the setting unit 160 includes a first setting unit 161 to a fifth setting unit 165. The first setting unit 161 sets the irradiation angle θ at the first irradiation angle θ1 so that the amount of light received by the first acquisition unit 151 is maximized. "The amount of light received reaches its maximum at the first irradiation angle θ1" means that the amount of light received changes from increasing to decreasing at the first irradiation angle θ1 when the irradiation angle θ is changed. At an irradiation angle θ such that the specularly reflected light from the media 5 is applied to the first light receiving device 91, the amount of received light acquired by the first acquisition unit 151 becomes maximum.

Similar to the first setting unit 161, the second setting unit 162 sets the irradiation angle θ at the second irradiation angle θ2 so that the amount of light received by the second acquisition unit 152 is maximized. The third setting unit 163 sets the irradiation angle θ at the third irradiation angle θ3 so that the amount of light received by the third acquisition unit 153 is maximized. The fourth setting unit 164 sets the irradiation angle θ at the fourth irradiation angle θ4 so that the amount of light received by the fourth acquisition unit 154 is maximized. The fifth setting unit 165 sets the irradiation angle θ at the fifth irradiation angle θ5 so that the amount of light received by the fifth acquisition unit 155 is maximized. The details of the correction mode will be described later.

The first irradiation angle θ1 to the fifth irradiation angle θ5 are registered in the irradiation angle registration unit 170. The first irradiation angle θ1 to the fifth irradiation angle θ5 set by the setting unit 160 are registered in the irradiation angle registration unit 170. As shown in FIG. 5, the irradiation angle registration unit 170 includes a first irradiation angle registration unit 171 to a fifth irradiation angle registration unit 175. The first irradiation angle θ1 is registered in the first irradiation angle registration unit 171. The first irradiation angle θ1 is an irradiation angle θ such that the light from the light source 60 is irradiated to the first point P1 of the media 5 and reflected toward the first light receiving device 91. The first irradiation angle θ1 is set by the first setting unit 161 in the correction mode. Similarly, the second irradiation angle θ2 is registered in the second irradiation angle registration unit 172. The third irradiation angle θ3 is registered in the third irradiation angle registration unit 173. The fourth irradiation angle θ4 is registered in the fourth irradiation angle registration unit 174. The fifth irradiation angle θ5 is registered in the fifth irradiation angle registration unit 175.

Actually, the first irradiation angle θ1 to the fifth irradiation angle θ5 may be registered as the first rotation angle θr1 to the fifth rotation angle θr5, respectively. In the present embodiment, the first rotation angle θr1 to the fifth rotation angle θr5 are registered in the irradiation angle registration unit 170 as angles equivalent to the first irradiation angle θ1 to the fifth irradiation angle θ5, respectively.

The first light receiving amount L1 to the fifth light receiving amount L5 (see FIGS. 7A to 7E, respectively) relating to the light receiving amount of the first light receiving device 91 to the fifth light receiving device 95 are registered in the light receiving amount registration unit 180, respectively. .. As shown in FIG. 5, the light receiving amount registration unit 180 includes a first light receiving amount registration unit 181 to a fifth light receiving amount registration unit 185. The first light receiving amount L1 is registered in the first light receiving amount registration unit 181. The first light receiving amount L1 is a determination threshold value for determining whether or not the first light receiving device 91 is irradiated with the specularly reflected light at the first point P1. In the first light receiving amount L1, the media 5 is in contact with the platen 13 at the first point P1, the light source 60 is generating light, and the irradiation angle θ measured by the irradiation angle measuring device 80 is the first irradiation. It is determined based on the amount of light received by the first light receiving device 91 in a state corresponding to the angle θ1. Details of the setting of the first light receiving amount L1 will be described later.

Similar to the first light receiving amount registration unit 181, the second light receiving amount L2 is registered in the second light receiving amount registration unit 182. The second light receiving amount L2 is a determination threshold value for determining whether or not the second light receiving device 92 is irradiated with the specularly reflected light at the second point P2. The third light receiving amount L3 is registered in the third light receiving amount registration unit 183. The third light receiving amount L3 is a determination threshold value for determining whether or not the third light receiving device 93 is irradiated with the specularly reflected light at the third point P3. The fourth light receiving amount L4 is registered in the fourth light receiving amount registration unit 184. The fourth light receiving amount L4 is a determination threshold value for determining whether or not the fourth light receiving device 94 is irradiated with the specularly reflected light at the fourth point P4. The fifth light receiving amount L5 is registered in the fifth light receiving amount registration unit 185. The fifth light receiving amount L5 is a determination threshold value for determining whether or not the fifth light receiving device 95 is irradiated with the specularly reflected light at the fifth point P5.

The light source control unit 190 controls the light source 60 to generate light in the detection mode. Here, the light source control unit 190 continuously generates light during the floating detection of the media 5. However, the light source control unit 190 may intermittently generate light during the floating detection of the media 5. For example, the light source control unit 190 may cause the light source 60 to generate light only when the rotation angle θr of the rotation axis 71a coincides with the first rotation angle θr1 to the fifth rotation angle θr5, or only in a time zone in the vicinity thereof. Good.

The irradiation angle control unit 200 controls the irradiation angle adjusting device 70 in the detection mode to change the irradiation angle θ. The irradiation angle control unit 200 is set here to rotate the rotary motor 71b at a constant speed. However, the irradiation angle control unit 200 may be set to intermittently rotate the rotation motor 71b to intermittently change the irradiation angle θ.

The light receiving amount acquisition unit 210 acquires the light receiving amount of the first light receiving device 91 to the fifth light receiving device 95 in the detection mode. As shown in FIG. 5, the light receiving amount acquisition unit 210 includes a first light receiving amount acquisition unit 211 to a fifth light receiving amount acquisition unit 215. The first light receiving amount acquisition unit 211 is configured to acquire the light receiving amount of the first light receiving device 91. Here, the first light receiving amount acquisition unit 211 acquires the light receiving amount of the first light receiving device 91 only when the rotation angle θr of the rotation shaft 71a coincides with the first rotation angle θr1 or in a time zone in the vicinity thereof. .. However, when the rotation angle θr of the rotation axis 71a coincides with the first rotation angle θr1 to the fifth rotation angle θr5 or when the light source 60 generates light only in a time zone in the vicinity thereof, the first light receiving amount acquisition unit. The 211 may continuously acquire the light receiving amount of the first light receiving device 91. That is, at least when the rotation angle θr of the rotation shaft 71a coincides with the first rotation angle θr1, light is generated by the light source 60, and the light reception amount of the first light receiving device 91 may be acquired.

Similar to the first light receiving amount acquisition unit 211, the second light receiving amount acquisition unit 212 acquires the light receiving amount of the second light receiving device 92. The third light receiving amount acquisition unit 213 acquires the light receiving amount of the third light receiving device 93. The fourth light receiving amount acquisition unit 214 acquires the light receiving amount of the fourth light receiving device 94. The fifth light receiving amount acquisition unit 215 acquires the light receiving amount of the fifth light receiving device 95.

The determination unit 220 determines whether or not the specularly reflected light from the first point P1 to the fifth point P5 is radiated to the first light receiving device 91 to the fifth light receiving device 95, respectively, from the first light receiving device 91 to the fifth light receiving device 95. Judgment is made based on the amount of light received. As shown in FIG. 5, the determination unit 220 includes a first determination unit 221 to a fifth determination unit 225. The first determination unit 221 is the first light receiving device 91 in a state where the light source 60 is generating light and the irradiation angle θ measured by the irradiation angle measuring device 80 matches the first irradiation angle θ1. When the light receiving amount is less than the first light receiving amount L1, it is determined that the media 5 is separated from the platen 13 at the first point P1. Similarly, the second determination unit 222 is a second light receiving device in a state where the irradiation angle θ measured by the irradiation angle measuring device 80 matches the second irradiation angle θ2 and the light source 60 is generating light. When the light receiving amount of 92 is less than the second light receiving amount L2, it is determined that the media 5 is separated from the platen 13 at the second point P2. The same applies to the third determination unit 223 to the fifth determination unit 225.

When the light receiving amount of the first light receiving device 91 is continuously acquired, the first determination unit 221 specifies the rotation angle θr in which the light receiving amount of the first light receiving device 91 exceeds the first light receiving amount L1. Then, it may be compared with the first rotation angle θr1. When the rotation angle θr in which the light receiving amount of the first light receiving device 91 exceeds the first light receiving amount L1 and the registered first rotation angle θr1 deviate from each other, the media 5 is the first point in the first determination unit 221. At P1, it is determined that the platen 13 is separated from the platen 13. In such a determination method, "in a state where the irradiation angle θ coincides with the first irradiation angle θ1, when the light receiving amount of the first light receiving device 91 is less than the first light receiving amount L1, the media 5 is the first point. It is included in the method of "determining that the object is separated from the platen 13 in P1". The same applies to the second determination unit 222 to the fifth determination unit 225.

Hereinafter, the process of setting the first rotation angle θr1 to the fifth rotation angle θr5 and the first light receiving amount L1 to the fifth light receiving amount L5 in the correction mode, and the process of detecting the floating of the media 5 in the detection mode will be described.

(Correction mode)
First, the process of setting the first rotation angle θr1 to the fifth rotation angle θr5 and the first light receiving amount L1 to the fifth light receiving amount L5 in the correction mode will be described. In the setting of the first rotation angle θr1 to the fifth rotation angle θr5 and the first light receiving amount L1 to the fifth light receiving amount L5 by the correction mode, the media 5 comes into contact with the platen 13 at least at the first point P1 to the fifth point P5. It is started after the state is configured. Hereinafter, the setting of the first irradiation angle θ1 and the first light receiving amount L1 will be described as an example.

In the first irradiation angle θ1, the media 5 is in contact with the platen 13 at the first point P1, the light source 60 is generating light, and the irradiation angle adjusting device 70 changes the irradiation angle θ of the light. The irradiation angle θ is set so that the amount of light received by the first light receiving device 91 is maximized in this state. The same applies to the setting of the second irradiation angle θ2 to the fifth irradiation angle θ5.

FIG. 6 is a graph showing the relationship between the rotation angle θr of the rotation shaft 71a and the light reception amount Lc1 of the first light receiving device 91 in the correction mode. The horizontal axis of FIG. 6 is the rotation angle θr. However, in FIG. 6, the angle of rotation θr in which the light from the light source 60 is applied to the first reflecting surface 72a (here, it is set to 0 to 36 degrees in the notation that one circumference is 360 degrees, the same applies hereinafter. ), And only the rotation angle θr (36 degrees to 72 degrees) at which the light from the light source 60 is applied to the second reflecting surface 72b is shown, and the other rotation angles θr are not shown. The vertical axis of FIG. 6 is the light receiving amount Lc1 of the first light receiving device 91.

In the correction mode, the light source 60 continuously generates light and the polygon mirror 72 is rotated at a constant speed. In the correction mode, the light receiving amount Lc1 of the first light receiving device 91 is continuously acquired.

As shown in FIG. 6, when the rotation angle θr is between 0 degrees and 36 degrees, the light receiving amount Lc1 of the first light receiving device 91 shows a maximum at the first rotation angle θr1. The maximum value of the light receiving amount Lc1 of the first light receiving device 91 is Lm1. As can be understood from FIGS. 3 and 4, in the present embodiment, when the rotation angle θr is smaller than the first rotation angle θr1, the specularly reflected light from the media 5 is in front of the first light receiving device 91 (X2). Pass by side). Further, when the rotation angle θr is larger than the first rotation angle θr1, the specularly reflected light from the media 5 passes behind the first light receiving device 91 (X1 side). When the rotation angle θr is equal to the first rotation angle θr1, the specularly reflected light from the media 5 is applied to the first light receiving device 91. Therefore, the light receiving amount Lc1 of the first light receiving device 91 shows a maximum at the first rotation angle θr1.

In the present embodiment, the first rotation angle θr1 is not predetermined, but is determined by measuring the light receiving amount Lc1 of the first light receiving device 91. The first point P1 on which the light is reflected on the media 5 is also not strictly determined in advance. The first point P1 is determined by the result of measurement of the light receiving amount Lc1 of the first light receiving device 91. However, the fact that the rotation angle θr coincides with the first rotation angle θr1 and therefore that the light is irradiated to the first point P1 is grasped by the measurement of the rotation angle θr by the irradiation angle measuring device 80. Therefore, the position of the first point P1 on the media 5 has reproducibility.

Further, the position of the first light receiving device 91 may vary. The variation in the position of the first light receiving device 91 is absorbed by setting the first rotation angle θr1 so as to correspond to the actual position of the first light receiving device 91.

As shown in FIG. 6, even when the rotation angle θr is between 36 degrees and 72 degrees, there is a rotation angle θr at which the light receiving amount Lc1 of the first light receiving device 91 is maximized (shown by θr1 in parentheses). As described above, the rotation angle θr at which the light receiving amount Lc1 of the first light receiving device 91 shows the maximum exists corresponding to each of the first reflecting surface 72a to the tenth reflecting surface 72j. The first rotation angle θr1 may be set to any of these angles. Further, the first rotation angle θr1 may be set to a plurality of angles among these angles. That is, the floating of the media 5 may be detected a plurality of times in one rotation of the polygon mirror 72.

After the first irradiation angle θ1 (actually, the first rotation angle θr1) is set, the first light receiving amount L1 is set. In the first light receiving amount L1, the media 5 is in contact with the platen 13 at the first point P1, the light source 60 is generating light, and the irradiation angle θ measured by the irradiation angle measuring device 80 is the first irradiation. It is determined based on the light receiving amount Lc1 of the first light receiving device 91 in a state corresponding to the angle θ1. As shown in FIG. 6, when the rotation angle θr coincides with the first rotation angle θr1, the first light receiving device 91 receives the light having the maximum value Lm1. The first light receiving amount L1 is determined based on the maximum value Lm1. The method for setting the first light receiving amount L1 is not particularly limited, but in consideration of the variation in the light receiving amount for each detection, for example, the maximum value Lm1 is multiplied by a predetermined value (for example, 0.8) of "1" or less. It is set to the amount of received light.

The first irradiation angle θ1 (first rotation angle θr1) and the first light receiving amount L1 set as described above are registered in the first irradiation angle registration unit 171 and the first light receiving amount registration unit 181, respectively. The same applies to the second irradiation angle θ2 (second rotation angle θr2) and the second light receiving amount L2 to the fifth irradiation angle θ5 (fifth rotation angle θr5) and the fifth light receiving amount L5.

(Detection mode)
In the detection mode, whether the media 5 is lifted from the platen 13 based on the comparison between the light receiving amount of the first light receiving device 91 to the fifth light receiving device 95 and the threshold value of the first light receiving amount L1 to the fifth light receiving amount L5. Whether or not it is judged. In the detection mode, the light source 60 is generating light, and the irradiation angle θ measured by the irradiation angle measuring device 80 coincides with the first irradiation angle θ1 to the fifth irradiation angle θ5, respectively. 1 The amount of light received by the light receiving devices 91 to 5 is acquired. When the acquired light receiving amount of the first light receiving device 91 to the fifth light receiving device 95 is less than the first light receiving amount L1 to the fifth light receiving amount L5, the media 5 of the printer 10 is the first point P1 to the fifth, respectively. It is determined that the point P5 is separated from the platen 13. In the following, a case where the media 5 is not floating at the first point P1 to the fourth point P4 and the media 5 is floating at the fifth point P5 will be described as an example.

FIG. 7A is a graph showing the relationship between the rotation angle θr of the rotation shaft 71a and the light reception amount Lc1 of the first light receiving device 91 in the detection mode. The horizontal axis of FIG. 7 is the rotation angle θr. However, in FIG. 7A, only the rotation angle θr (0 to 36 degrees) in which the light from the light source 60 is applied to the first reflection surface 72a is shown, and the other rotation angles θr are not shown. The vertical axis of FIG. 7A is the light receiving amount Lc1 of the first light receiving device 91.

In this embodiment, the light source 60 continuously generates light even in the detection mode. However, in the detection mode, the light receiving amount Lc1 of the first light receiving device 91 is acquired only when the rotation angle θr of the rotation axis 71a coincides with the first rotation angle θr1 and in a time zone in the vicinity thereof. In FIG. 7A, the received light amount Lc1 in the time zone acquired by the control device 100 is shown by a solid line, and the received light amount Lc1 in the time zone not acquired by the control device 100 is shown by a two-dot chain line.

7B to 7E are graphs showing the relationship between the rotation angle θr of the rotation shaft 71a and the light receiving amounts Lc2 to Lc5 of the second light receiving device 92 to the fifth light receiving device 95, respectively, in the detection mode. The views of FIGS. 7B to 7E are the same as those of FIGS. 7A.

As shown in FIG. 7A, when the rotation angle θr is between 0 degree and 36 degrees, the light receiving amount Lc1 of the first light receiving device 91 shows a value at or near the maximum value Lm1 at the first rotation angle θr1. The light receiving amount Lc1 (Lm1) of the first light receiving device 91 at the rotation angle θr1 is larger than the first light receiving amount L1. Therefore, it is determined that the light generated by the light source 60 is specularly reflected at the first point P1, that is, the media 5 is not floating at the first point P1. Similarly, as shown in FIG. 7B, the light receiving amount (maximum value) Lm2 of the second light receiving device 92 when the rotation angle θr is the second rotation angle θr2 is larger than the second light receiving amount L2. Therefore, it is determined that the media 5 is not floating at the second point P2. As shown in FIG. 7C, the light receiving amount (maximum value) Lm3 of the third light receiving device 93 when the rotation angle θr is the third rotation angle θr3 is larger than the third light receiving amount L3. Therefore, it is determined that the media 5 is not floating at the third point P3. As shown in FIG. 7D, the light receiving amount (maximum value) Lm4 of the fourth light receiving device 94 when the rotation angle θr is the fourth rotation angle θr4 is larger than the fourth light receiving amount L4. Therefore, it is determined that the media 5 is not floating at the fourth point P4.

On the other hand, as shown in FIG. 7E, the light receiving amount Lm5 of the fifth light receiving device 95 when the rotation angle θr is the fifth rotation angle θr5 is smaller than the fifth light receiving amount L5. As a result, it can be seen that the light generated by the light source 60 is not specularly reflected at the fifth point P5. When the media 5 is floating from the platen 13, the light is not specularly reflected toward the fifth light receiving device 95, but is diffusely reflected or reflected in another direction. Therefore, at the fifth point P5, it is determined that the media 5 is floating from the platen 13.

As described above, in the present embodiment, the specular reflection of light on the media 5 is used in order to detect the floating of the media 5. Such a configuration has several advantages. One advantage is that, unlike the contact type sensor, the floating of the media 5 can be detected without contact. Further, another advantage is that since the optical path is fixed, the position where the floating of the media 5 occurs can be specified. Yet another advantage is that the amount of light reflected by the media 5 is large because the specularly reflected light is used. Therefore, when the media 5 is floated, the amount of light received is greatly reduced. In addition, it is not easily affected by noise such as ambient light. In other words, the so-called S / N ratio (signal / noise ratio) is high. Therefore, the risk of false positives is small. For example, in the case of a media floating detection sensor that detects the floating of media by using diffusely reflected light, the position where the floating of the media occurs can only be roughly specified, and there is a high risk of false detection.

Due to the above advantages, there has been a media float detection sensor that utilizes specular reflection of light on the media. However, such a conventional media float detection sensor has a problem that the setting labor or cost is large. In a conventional media floating detection sensor that utilizes specular reflection of light on a medium, high accuracy is required for setting an optical path of light for detecting floating of the media. Unless the light emitted from the light source is reflected by the media and reaches the light receiving device, the sensor that detects the floating of the media by the specularly reflected light by the media cannot be established. Therefore, accuracy is required for the mounting position of the light source, the tilt angle of the light source, the mounting position of the light receiving device, and the like. Therefore, it has led to an increase in labor and time related to setting. Alternatively, it has led to an increase in cost due to an improvement in component accuracy.

The printer 10 according to the present embodiment is configured to solve the above-mentioned problems. The media floating detection sensor 50 according to the present embodiment includes an irradiation angle adjusting device 70 that changes the irradiation angle θ in which light is applied to the platen 13, and an irradiation angle measuring device 80 that measures the irradiation angle θ. In the media floating detection sensor 50, the light source 60 generates light, and the irradiation angle θ measured by the irradiation angle measuring device 80 coincides with the registered first irradiation angles θ1 to fifth irradiation angles θ5. In this state, the light receiving amount of the first light receiving device 91 to the fifth light receiving device 95 and the registered first light receiving amount L1 to the fifth light receiving amount L5 are compared with each other. Then, in the media floating detection sensor 50, when the light receiving amount of the first light receiving device 91 to the fifth light receiving device 95 is less than the first light receiving amount L1 to the fifth light receiving amount L5 under the above conditions, the media 5 is the first one. It is determined that the points P1 to the fifth point P5 are separated from the platen 13.

According to the media floating detection sensor 50, the light reflected by the media 5 can be irradiated to the first light receiving devices 91 to the fifth light receiving devices 95 by changing the light irradiation angle θ by the irradiation angle adjusting device 70. it can. Whether or not the reflected light from the media 5 is applied to the first light receiving device 91 to the fifth light receiving device 95 depends on the light receiving amount of the first light receiving device 91 to the fifth light receiving device 95 and the first light receiving amount L1 as a threshold value. By comparison with the fifth light receiving amount L5, each can be easily determined. The irradiation angle θ is measured by the irradiation angle measuring device 80 for the first irradiation angle θ1 to the fifth irradiation angle θ5 such that the reflected light from the media 5 is applied to the first light receiving device 91 to the fifth light receiving device 95. Therefore, it is easily identifiable and reproducible. Even if there are variations in the positions of the first light receiving devices 91 to the fifth light receiving devices 95, the variations correspond to the actual positions of the first light receiving devices 91 to the fifth light receiving devices 95, and the first rotation angle θr1 to It can be absorbed by setting the fifth rotation angle θr5. Therefore, according to the media floating detection sensor 50 according to the present embodiment, the position where the floating of the media 5 has occurred can be accurately specified, and the setting is easy.

In the present embodiment, the media floating detection sensor 50 automatically sets or corrects the first irradiation angle θ1 to the fifth irradiation angle θ5, and sets or corrects the first light receiving amount L1 to the fifth light receiving amount L5. It is configured. Specifically, the media float detection sensor 50 is configured so that the correction mode can be selected, and the irradiation angle θ is changed in the correction mode and light is emitted from the light source 60. In this state, the light receiving amounts of the first light receiving devices 91 to 5 are acquired, and the irradiation angles θ such that the acquired light receiving amounts are maximized are set to the first irradiation angles θ1 to θ5. According to such a configuration, the setting or correction of the first irradiation angle θ1 to the fifth irradiation angle θ5 and the setting or correction of the first light receiving amount L1 to the fifth light receiving amount L5 are automatically performed. The burden on the user is small.

In the present embodiment, the setting or correction of the first irradiation angle θ1 to the fifth irradiation angle θ5 and the setting or correction of the first light receiving amount L1 to the fifth light receiving amount L5 are automatically performed, but the user manually performs the setting or correction. It may be done at. Regardless of whether it is automatic or manual, in the first irradiation angle θ1 to the fifth irradiation angle θ5, the media 5 is in contact with the platen 13 at the first point P1 to the fifth point P5, and the light source 60, respectively. Is generating light, and the irradiation angle θ is such that the amount of light received by the first light receiving device 91 to the fifth light receiving device 95 is maximized when the irradiation angle adjusting device 70 changes the irradiation angle θ. Is set to. In the first light receiving amount L1 to the fifth light receiving amount L5, the media 5 is in contact with the platen 13 at the first points P1 to P5, the light source 60 is generating light, and the irradiation angle measuring device 80 is used. It is determined based on the amount of light received by the first light receiving device 91 to the fifth light receiving device 95 in a state where the irradiation angle θ measured by is coincided with the first irradiation angle θ1 to the fifth irradiation angle θ5.

In the present embodiment, the irradiation angle adjusting device 70 includes a polygon mirror 72 that is rotated around a rotation axis 71a by a drive unit 71. The polygon mirror 72 is formed in a polygonal columnar shape, and includes a plurality of reflecting surfaces 72a to 72j extending in the axial direction of the rotation axis 71a. The light generated by the light source 60 is reflected by the plurality of reflecting surfaces 72a to 72j, and the irradiation angle θ changes according to the rotation angle θr of the rotation axis 71a. According to the irradiation angle adjusting device 70, the irradiation angle θ can be easily changed.

In the above embodiment, the reflector that reflects light is a polygonal columnar polygon mirror 72, but other reflectors may be used. The reflector may be configured to reflect light and may include at least one reflecting surface extending in the axial direction of the rotating shaft 71a. The reflector is rotated around the rotation shaft 71a by the drive unit 71. Light may be reflected by any of at least one reflecting surface. With such a configuration, the irradiation angle θ can be easily changed as in the polygon mirror 72. The reflector may have, for example, a shape in which a part of a circle is cut straight in the axial direction of the rotation axis 71a.

In the present embodiment, the irradiation angle measuring device 80 is configured to measure the irradiation angle θ by measuring the rotation angle θr of the rotation shaft 71a. The rotation angle θr can be easily measured by, for example, a rotary encoder or the like. Therefore, according to such a configuration, the irradiation angle θ can be easily measured. Since the rotation angle θr is measured, the rotation speed of the polygon mirror 72 may be uneven. Therefore, there is an advantage that high performance is not required for the rotary motor 71b of the drive unit 71.

In the present embodiment, the reflecting surfaces 72a to 72j of the polygon mirror 72 are made of a material that reflects light in a specific wavelength band with a higher reflectance than light in another wavelength band. Specifically, the reflecting surfaces 72a to 72j of the polygon mirror 72 reflect the red light generated by the light source 60 with a higher reflectance than the light in other wavelength bands. The first light receiving devices 91 to 95 are configured to selectively measure the amount of light received in the specific wavelength band. According to this configuration, only light in a specific wavelength band is used for detecting the floating of the media 5, so that it is not easily affected by ambient light.

In particular, in the present embodiment, the reflecting surfaces 72a to 72j of the polygon mirror 72 are formed by a film F1 that reflects light in the specific wavelength band (here, red light) with a higher reflectance than light in other wavelength bands. It is configured by being attached to the surface of the polygon mirror 72. By using the film F1 in this way, the manufacturing cost of the polygon mirror 72 can be reduced.

In the present embodiment, the media float detection sensor 50 includes a plurality of light receiving devices 91 to 95. As a result, the media float detection sensor 50 can detect the float of the media 5 at a plurality of points. Since the media floating detection sensor 50 according to the present embodiment includes an irradiation angle adjusting device 70 that changes the irradiation angle θ and an irradiation angle measuring device 80 that measures the irradiation angle θ, a plurality of light receiving devices 91 to 95 Suitable for irradiating light. According to such a configuration, the floating of the media 5 at a plurality of points can be detected by the light generated by one light source 60.

Further, the first point P1 to the fifth point P5 are arranged in the transport direction X of the media 5. Therefore, the media float detection sensor 50 according to the present embodiment is suitable for detecting the float related to the transport of the media 5.

(Second Embodiment)
The printer according to the second embodiment is configured so that the trajectory of light can be adjusted not only in the transport direction but also in the scanning direction. In the second embodiment, the trajectory of light can be tilted with respect to the transport method. In the second embodiment, the angles (θ1 to θ5) that were called “irradiation angles” in the first embodiment are referred to as “elevation angles”. The symbols representing the elevation angles will continue to be "θ" and "θ1 to θ5". Further, in the following, the angle with respect to the transport direction of the light whose direction is adjusted by the irradiation angle adjusting device is referred to as "oblique angle". The skew angle is expressed as "second skew angle θx2 to tenth skew angle θx10" (see FIG. 8). In the description of the second embodiment, the same reference numerals are used for the members common to the first embodiment. In addition, duplicate explanations will be omitted or simplified.

In the present embodiment, for example, it is assumed that the mounting positions of the first light receiving device 91 to the fifth light receiving device 95 may vary with respect to the scanning direction Y. In addition, for example, it is assumed that the arrangement direction of the first light receiving devices 91 to the fifth light receiving device 95 and the reflected light in the media 5 are not parallel in a plan view. In the above case, since the position of the light receiving device and the optical path are deviated with respect to the scanning direction Y, a situation may occur in which the reflected light is not emitted toward the light receiving device regardless of the elevation angle θ. .. Such a situation cannot be dealt with in the configuration as in the first embodiment.

The polygon mirror 72 according to the present embodiment is formed into polygonal columns that are polygonal when viewed along the scanning direction Y, and a plurality of reflecting surfaces 72a to 72j extending at different angles with respect to the scanning direction Y. It has. The plurality of reflecting surfaces 72a to 72j are configured to reflect light. The light source 60 is provided on the upstream X1 side in the transport direction with respect to the polygon mirror 72, and heads toward a predetermined point among the trajectories of the plurality of reflecting surfaces 72a to 72j when the polygon mirror 72 is rotated by the drive unit 71. Then, the light is irradiated so as to be orthogonal to the scanning direction Y. However, the light source 60 does not have to irradiate light so as to be orthogonal to the scanning direction Y, and may irradiate light obliquely with respect to the scanning direction Y. Light is reflected by the plurality of reflecting surfaces 72a to 72j at different oblique angles with respect to the transport direction X.

FIG. 8 is a plan view schematically showing the optical paths Opt1 to Opt10 of the reflected light on the plurality of reflecting surfaces 72a to 72j and the plurality of reflecting surfaces 72a to 72j (however, the reflecting surfaces 72c, 72d, 72f, 72g, The optical paths of 72h and 72i and the reflected light on the reflecting surface are not shown). In FIG. 8, the time when the first reflecting surface 72a, the second reflecting surface 72b, the fifth reflecting surface 72e, and the tenth reflecting surface 72j are positioned so as to extend in the vertical direction is shown in an overlapping manner. The first reflecting surface 72a illustrated in FIG. 8 is the first reflecting surface 72a when standing upright with respect to the platen 13. The second reflecting surface 72b illustrated in FIG. 8 is the second reflecting surface 72b when standing upright with respect to the platen 13. The fifth reflecting surface 72e illustrated in FIG. 8 is the fifth reflecting surface 72e when standing upright with respect to the platen 13. The tenth reflecting surface 72j illustrated in FIG. 8 is the tenth reflecting surface 72j when standing upright with respect to the platen 13.

As shown in FIG. 8, the first reflecting surface 72a is configured to be parallel to the axial direction (scanning direction Y) of the rotating shaft 71a in a plan view. On the other hand, the second reflecting surface 72b is tilted by an angle θt2 with respect to the axial direction of the rotating shaft 71a in a plan view. Although some illustrations are omitted, the third reflecting surface 72c to the tenth reflecting surface 72j are also tilted by a predetermined angle with respect to the extension direction of the rotation shaft 71a in a plan view. Hereinafter, the angles of inclination of the reflecting surfaces 72a to 72j with respect to the rotation axis 71a are referred to as the second surface tilt angle θt2 to the tenth surface tilt angle θt10, respectively.

Although some illustrations are omitted, the second surface tilt angle θt2 to the tenth surface tilt angle θt10 are set to different angles. The second surface tilt angle θt2 to the tenth surface tilt angle θt10 may be set to different angles and are not further limited, but here, the second surface tilt angle θt2 to the tenth surface tilt angle θt10 are It is getting bigger and bigger in this order. For example, the third surface tilt angle (not shown) is larger than the second surface tilt angle θt2. Here, the difference in the tilt angle between the two adjacent reflecting surfaces is the same except between the first reflecting surface 72a and the tenth reflecting surface 72j. Although it is shown in a large size in FIG. 8, the difference in the tilt angle is preferably about 1 degree.

As shown in FIG. 8, when the second reflecting surface 72b is irradiated with light (the incident light overlaps with the optical path Opt1), the light is reflected by drawing the second oblique optical path Opt2. The reflected light on the second reflecting surface 72b is tilted by an angle θx2 with respect to the transport direction X in a plan view. Note that, in FIG. 8, the second reflecting surface 72b when standing upright with respect to the platen 13 is shown, but in a plan view, all the light is emitted toward the second reflecting surface 72b. In the time zone, the light is reflected at an angle θx2 with respect to the transport direction X. Similarly, in a plan view, light is emitted toward the third reflecting surface 72c to the tenth reflecting surface 72j in all time zones, and is determined by the tilt angle with respect to the transport direction X, respectively. It is reflected by tilting only the angle.

Since the oblique angles θx2 to θx10 are different, the optical paths Opt1 to Opt10 of the reflected light on the plurality of reflecting surfaces 72a to 72j move in the scanning direction Y as they proceed toward the upstream X1 side of the transport direction X, as shown in FIG. Are separated from each other. For example, when the first light receiving device 91 is at the position Px in FIG. 8 with respect to the transport direction X, if the position of the first light receiving device 91 with respect to the scanning direction Y is within the range of the width W, reflection on any of the reflecting surfaces. Light can reach the first light receiving device 91. The width W is the distance between the first optical path Opt1 and the tenth oblique optical path Opt10 with respect to the scanning direction Y at the position Px.

The angle at which the light receiving device receives the light from the light source 60 (either parallel to the transport direction X or one of the second skew angle θx2 to the tenth skew angle θx10) is determined by the polygon mirror 72 in a plan view. The angle is such that the reflected light of is directed toward the light receiving device. Further, as in the first embodiment, the elevation angle θ such that the light receiving device receives the light from the light source 60 is an angle such that the reflected light from the media 5 is directed toward the light receiving device in the side view. In the present embodiment, the rotation angle θr satisfying the above two conditions is discovered and set by the correction mode.

FIG. 9 is a graph showing an example of the relationship between the rotation angle θr of the rotation shaft 71a and the light reception amount Lc1 of the first light receiving device 91 in the correction mode according to the second embodiment. Even in the correction mode according to the present embodiment, the light is constantly irradiated during the correction, and the received light amount Lc1 is constantly acquired. In FIG. 9, the angle of rotation θr is shown from 0 degree to 360 degrees. The angle of rotation θr is shown divided into 10 blocks every 36 degrees. The blocks of 0 to 36 degrees (first block) indicate that light is reflected by the first reflecting surface 72a, as shown in FIG. The blocks of 36 degrees to 72 degrees (second block) indicate that light is reflected by the second reflecting surface 72b. Hereinafter, the same applies to the tenth block.

As shown in FIG. 9, the light receiving amount Lc1 of the first light receiving device 91 includes a fourth block (reflected light on the fourth reflecting surface 72d), a fifth block (reflected light on the fifth reflecting surface 72e), and The maximum is shown in the sixth block (reflected light on the sixth reflecting surface 72f). In other blocks, the light receiving amount Lc1 of the first light receiving device 91 does not have a maximum point. As shown in FIG. 9, the maximum point in the fourth block appears when the rotation angle θr is the first rotation angle θr14 in the fourth block. The maximum point in the fifth block appears when the rotation angle θr is the first rotation angle θr15 in the fifth block. The maximum point in the sixth block appears when the rotation angle θr is the first rotation angle θr16 in the sixth block. When the rotation angle θr coincides with the first rotation angles θr14, θr15, and θr16, the elevation angle θ corresponds to θ1. Therefore, when the rotation angles θr coincide with the first rotation angles θr14, θr15, and θr16, a maximum point having maximum values Lm14, Lm15, and Lm16 appears in the light receiving amount Lc1 of the first light receiving device 91, respectively.

As shown in FIG. 9, the maximum value Lm15 in the fifth block is larger than the maximum value Lm14 in the fourth block and the maximum value Lm16 in the sixth block. The maximum value Lm15 in the fifth block is the largest of the three maximum values Lm14, Lm15, and Lm16. This indicates that among the optical paths Opt1 to Opt10, the fifth oblique optical path Opt5 passes closest to the first light receiving device 91. In the case of FIG. 9, maximum points appear in the fourth block and the sixth block, respectively. Therefore, almost all of the light reflected by the fifth reflecting surface 72e is irradiated to the first light receiving device 91, and the light reflected by the fourth reflecting surface 72d and the sixth reflecting surface 72f is a part thereof, respectively. Is considered to be radiated to the first light receiving device 91. The maximum point is not limited to a plurality, and may be one.

In the present embodiment, the first irradiation angle is the light receiving amount Lc1 of the first light receiving device 91 among the rotation angles θr of one or a plurality of rotating shafts 71a such that the light receiving amount Lc1 of the first light receiving device 91 is maximized. Is determined based on the maximum rotation angle θr. At the time of this correction, the media 5 is in contact with the platen 13 at the first point P1. Further, the polygon mirror 72 is rotated, and the light source 60 generates light. In the case of FIG. 9, the first rotation angle θr1 is defined by the first rotation angle θr15 of the fifth block. At this time, the first light receiving device 91 is located on or near the fifth oblique optical path Opt5 in a plan view. That is, the first light receiving device 91 is located at or near the point Pxy in FIG. The media float detection sensor 50 also registers the first rotation angle θr1 as an angle equal to the first irradiation angle. Although the description is omitted, the same applies to the second light receiving device 92 to the fifth light receiving device 95.

As described above, according to the media floating detection sensor 50 according to the present embodiment, the trajectory of light can be adjusted not only in the transport direction X but also in the scanning direction Y. Further, in the present embodiment, although the first irradiation angle to the fifth irradiation angle include an elevation angle with respect to the platen 13 and an oblique angle with respect to the transport direction X, it is as easy as the first embodiment. The first irradiation angle to the fifth irradiation angle can be set. The first irradiation angle to the fifth irradiation angle include an elevation angle with respect to the platen 13 and an oblique angle with respect to the transport direction X, but correspond only to the first rotation angle θr1 to the fifth rotation angle θr5, respectively. Therefore, the setting of the first irradiation angle to the fifth irradiation angle is as easy as that of the first embodiment.

(Third Embodiment)
The media floating detection sensor according to the third embodiment is configured so that the first irradiation angle to the fifth irradiation angle and the first light receiving amount to the fifth light receiving amount can be registered for different types of media, respectively. ing. Other configurations of this embodiment are common to those of the first embodiment or the second embodiment. Therefore, also in the description of the present embodiment, a common reference numeral will be used for the members common to the first embodiment and the second embodiment. In addition, duplicate explanations will be omitted or simplified.

FIG. 10 is a block diagram of the media float detection sensor 50 according to the present embodiment. As shown in FIG. 10, the control device 100 according to the present embodiment includes a first media processing unit 100A and a second media processing unit 100B. Although not shown, the processing unit 100A for the first media has the same configuration as the control device according to the first embodiment and the second embodiment. The second media processing unit 100B also has the same configuration as the control device according to the first embodiment and the second embodiment. The second media processing unit 100B sets and registers the first irradiation angle to the fifth irradiation angle and the first light receiving amount to the fifth light receiving amount for media of a type different from the media related to the first media processing unit 100A. It is a processing unit. The control device 100 may further include other processing units below the third media processing unit, but illustration and description thereof will be omitted here.

Although the description of the functions of each unit is omitted, as shown in FIG. 10, the second media processing unit 100B includes a mode selection unit 110B, a correction unit 120B, an irradiation angle registration unit 170B, and a light receiving amount registration unit 180B. A light source control unit 190B, an irradiation angle control unit 200B, a light receiving amount acquisition unit 210B, and a determination unit 220B are provided. Other than the correction unit 120B, the irradiation angle registration unit 170B, and the light receiving amount registration unit 180B, they may be shared with the first media processing unit 100A. The irradiation angle registration unit 170B includes a first irradiation angle registration unit 171B to a fifth irradiation angle registration unit 175B.

The media has different thickness, light reflectance, and the like depending on the type. When the light reflectance differs between the first media and the second media, the light receiving amount registration unit 180B of the first media processing unit 100A and the light receiving amount registration unit 180B of the second media processing unit 100B are used. Different light receiving amounts are registered. When the thickness differs between the first media and the second media, different irradiations are applied to the irradiation angle registration unit 100A of the first media processing unit 100A and the irradiation angle registration unit 170B of the second media processing unit 100B. The horn is registered. In this case, different light receiving amounts may be registered in the light receiving amount registration unit of the first media processing unit 100A and the light receiving amount registration unit 180B of the second media processing unit 100B.

FIG. 11 is a right side view schematically showing a first irradiation angle θ1A related to the first media 5 and a first irradiation angle θ1B related to the second media 6. As shown in FIG. 11, the thickness T2 of the second media 6 is thicker than the thickness T1 of the first media 5. Therefore, the first irradiation angle θ1A related to the first media 5 is larger than the first irradiation angle θ1B related to the second media 6. The media float detection sensor 50 according to the present embodiment can set and register different irradiation angles and light receiving amounts for different media in this way. In the present embodiment, it is not necessary to change the mechanical configuration even in the correction of the optical path related to the unregistered media having different thicknesses, and it is only necessary to newly set and register the rotation angle. Therefore, it is easy to set the irradiation angle for a plurality of types of media, particularly media having different thicknesses.

The embodiments of the present invention have been described above. However, the above-described embodiment is only an example, and various other embodiments are possible.

For example, in the above embodiment, the irradiation angle adjusting device 70 changes the irradiation angle of light by a rotating polygon mirror 72. However, the configuration of the irradiation angle adjusting device is not limited to this. The irradiation angle adjusting device may be, for example, another optical device (for example, a MEMS mirror) including a reflector having a reflecting surface for reflecting light and a driving unit for changing the direction of the reflecting surface. In addition, the irradiation angle adjusting device is not particularly limited as long as it can change the irradiation angle of light on the medium. For example, the irradiation angle adjusting device may move the light source to change the angle with respect to the media.

In the above embodiment, the media float detection sensor 50 is provided on the carriage 20. However, the position of the media float detection sensor 50 is not limited. The media float detection sensor may be fixed above the platen, for example. In that case, a plurality of media float detection sensors may be provided side by side in the main scanning direction.

The printer is not limited to printing on roll-shaped media, but may be printed on sheet-shaped media. The printer may be a so-called flatbed type printer. In the present invention, the "support base" means all the members that support the media, and includes not only the members that support the media that are unwound from the roll but also so-called tables that support the sheet-shaped media.

In the above embodiment, the media float detection sensor 50 is provided in the printer 10, but it may be provided in a device other than the printer. The application target of the media float detection sensor is not limited in any way.

5 media (1st media)
6 Second media (other media)
10 Inkjet printer (printer)
13 Platen (support stand)
21 Recording head 40 Conveyor device 50 Media floating detection sensor 60 Light source 70 Irradiation angle adjustment device 71 Drive unit 71a Rotation axis 72 Polygon mirror (reflector)
72a to 72j 1st reflection surface to 10th reflection surface 80 Irradiation angle measuring device 91 to 95 1st light receiving device to 5th light receiving device 100 Control device 110 Mode selection unit 130 Correction time irradiation angle control unit 140 Correction time light source control unit 151 ~ 155 First acquisition unit (light reception amount acquisition unit at the time of first correction) to fifth acquisition unit 161 to 165 First setting unit to fifth setting unit 171 to 175 First irradiation angle registration unit to fifth irradiation angle registration unit 171B ~ 175B 1st irradiation angle registration unit (other 1st irradiation angle registration unit) ~ 5th irradiation angle registration unit 181 to 185 1st light reception amount registration unit ~ 5th light reception amount registration unit 190 Light source control unit 200 Irradiation angle control unit 211-215 First light receiving amount acquisition unit to fifth light receiving amount acquisition unit 221 to 225 First judgment unit to fifth judgment unit F1 Film θ Irradiation angle θ1 to θ5 First irradiation angle to fifth irradiation angle θr Rotation angle θr1 to θr5 1st rotation angle to 5th rotation angle θt2 to θt10 2nd surface tilt angle to 10th surface tilt angle θx2 to θx10 2nd skew angle to 10th skew angle L1 to L5 1st light reception amount to 5th light reception amount Lm1 to Lm5 Maximum value of the amount of light received by the first to fifth light receiving devices P1 to P5 First to fifth points X Transport direction (second direction)
Y scanning direction (first direction)

Claims (11)

A support stand that supports the media and
A light source that produces light and
An irradiation angle adjusting device that changes the irradiation angle at which the light is applied to the support base,
An irradiation angle measuring device for measuring the irradiation angle and
A first light receiving device that irradiates a first point of the medium via the irradiation angle adjusting device and receives the light reflected at the first point.
Control device and
With
The control device is
A first irradiation angle registration unit in which a first irradiation angle, which is the irradiation angle, such that the light is applied to the first point of the medium and reflected toward the first light receiving device, is registered.
A first light receiving amount registration unit in which the first light receiving amount related to the light receiving amount of the first light receiving device is registered, and
A light source control unit that controls the light source to generate the light,
A first light receiving amount acquisition unit that acquires the light receiving amount of the first light receiving device, and
An irradiation angle control unit that controls the irradiation angle adjusting device to change the irradiation angle,
In a state where the light source generates the light and the irradiation angle measured by the irradiation angle measuring device matches the first irradiation angle, the light receiving amount of the first light receiving device is the first. When the amount of light received is less than the amount of light received, the first determination unit that determines that the media is separated from the support at the first point, and
Is equipped with
Media float detection sensor. In the first irradiation angle, the media is in contact with the support at the first point, the light source is generating the light, and the irradiation angle adjusting device changes the irradiation angle. The irradiation angle is set so that the amount of light received by the first light receiving device is maximized in the present state.
The first light receiving amount is such that the media is in contact with the support at the first point, the light source is generating the light, and the irradiation angle measured by the irradiation angle measuring device is the irradiation angle. It is determined based on the amount of light received by the first light receiving device in a state of matching the first irradiation angle.
The media float detection sensor according to claim 1. The control device is
A mode selection unit that allows you to select the correction mode,
A correction irradiation angle control unit that controls the irradiation angle adjusting device in the correction mode to continuously or intermittently change the irradiation angle.
A correction light source control unit that controls the light source to generate the light in the correction mode,
At the time of the first correction, the light source control unit at the time of correction generates the light, and the irradiation angle control unit at the time of correction acquires the light receiving amount of the first light receiving device in a state where the irradiation angle is changed. Received amount acquisition unit and
A first setting unit that sets the irradiation angle to the first irradiation angle so that the amount of light received by the light receiving amount acquisition unit at the time of the first correction is maximized.
Is equipped with
The media float detection sensor according to claim 1 or 2. In the control device, another first irradiation angle, which is the irradiation angle such that the light irradiated to another medium having a thickness different from that of the medium is reflected toward the first light receiving device, is registered. It also has another first irradiation angle registration unit,
The media float detection sensor according to any one of claims 1 to 3. The support base extends in a first direction and a second direction orthogonal to the first direction.
The irradiation angle adjusting device is
A drive unit having a rotation shaft extending in the first direction and rotating the rotation shaft,
A reflector connected to the rotating shaft and rotated around the rotating shaft by the driving unit.
With
The reflector is configured to reflect the light and comprises at least one reflecting surface extending in the first direction.
The light source is provided on one side of the second direction with respect to the reflector, and faces a predetermined point in the trajectory of at least one reflecting surface when the reflector is rotated by the driving unit. And irradiate the light
The light is reflected by the at least one reflective surface and
The irradiation angle changes according to the rotation angle of the rotation axis.
The media float detection sensor according to any one of claims 1 to 4. The irradiation angle measuring device is configured to measure the irradiation angle by measuring the rotation angle of the rotation axis.
The media float detection sensor according to claim 5. The support base extends in a first direction and a second direction orthogonal to the first direction.
The irradiation angle adjusting device is
A drive unit having a rotation shaft extending in the first direction and rotating the rotation shaft,
A reflector connected to the rotating shaft and rotated around the rotating shaft by the driving unit.
With
The reflector is formed of a polygonal columnar shape that is polygonal in the first direction, and is configured to extend at different angles with respect to the first direction and reflect the light. With
The light source is provided on one side of the second direction with respect to the reflector, and toward a predetermined point among the trajectories of the plurality of reflecting surfaces when the reflector is rotated by the driving unit. Irradiate the light and
The light is reflected by the plurality of reflecting surfaces at different angles with respect to the second direction.
The irradiation angle measuring device is configured to measure the irradiation angle by measuring the rotation angle of the rotation axis.
The first irradiation angle is the first state in which the media is in contact with the support at the first point, the reflector is rotated, and the light source is generating the light. It is determined based on the rotation angle at which the light receiving amount of the first light receiving device is the maximum among the rotation angles of one or a plurality of the rotating shafts that maximize the light receiving amount of the light receiving device.
The media float detection sensor according to any one of claims 1 to 4. The irradiation angle adjusting device is
A reflector having a reflecting surface that reflects the light, and
A drive unit that changes the direction of the reflective surface,
The reflecting surface is made of a material that reflects light in a predetermined wavelength band with a higher reflectance than light in other wavelength bands.
The first light receiving device is configured to selectively measure the amount of light received in the predetermined wavelength band.
The media float detection sensor according to any one of claims 1 to 7. The reflecting surface is formed by attaching a film that reflects light in the predetermined wavelength band with a higher reflectance than light in other wavelength bands to the surface of the reflector.
The media float detection sensor according to claim 8. A second light receiving device for receiving the light that is irradiated to the second point of the media via the irradiation angle adjusting device and reflected at the second point is provided.
The control device is
A second irradiation angle registration unit in which a second irradiation angle, which is the irradiation angle, such that the light is applied to the second point of the medium and reflected toward the second light receiving device, is registered.
A second light receiving amount registration unit in which the second light receiving amount related to the light receiving amount of the second light receiving device is registered, and
A second light receiving amount acquisition unit that acquires the light receiving amount of the second light receiving device, and
In a state where the light source generates the light and the irradiation angle measured by the irradiation angle measuring device matches the second irradiation angle, the light receiving amount of the second light receiving device is the second. A second determination unit that determines that the media is separated from the support at the second point when the amount of light received is less than the amount received.
Is equipped with
The media float detection sensor according to any one of claims 1 to 9. The media float detection sensor according to claim 10,
A recording head that prints on the media
A transport device that transports the media in a predetermined transport direction, and
With
The first point and the second point are arranged in the transport direction.
Printer.

Images