JP2024117240A - Printing device - Google Patents

Abstract

To provide a printing device that improves an accuracy of detecting a print medium.SOLUTION: A printing device includes a detection unit. The detection unit includes a light emitting unit and a light receiving unit that receives light. The light emitting unit and the light receiving unit are disposed in a thickness direction of a print medium, facing each other with the print medium therebetween, and are provided so as to be movable in an intersecting direction intersecting a transport direction. The light emitting unit is provided with a first light emitting element and a second light emitting element of the same type. The first light emitting element and the second light emitting element are arranged side by side in the intersecting direction with a gap therebetween. Between the first light emitting element and the second light emitting element, a first light emitting width is formed which extends along the intersecting direction and enables the light receiving unit to receive light emitted from the light emitting unit from the first light emitting element to the second light emitting element with a signal intensity of 90% or more, and the first light emitting width is formed to be longer than the second light emitting width in which the first light emitting element is arranged on an optical axis of the light receiving unit and the light emitted from the first light emitting element can be received by the light receiving unit with a signal intensity of 90% or more.SELECTED DRAWING: Figure 3

Description

The present invention relates to a printing device.

2. Description of the Related Art Printing devices capable of printing on various types of print media are known.
For example, Japanese Patent Application Laid-Open No. 2003-233633 discloses a recording device that records an image on a recording medium that includes a base sheet and a label provided on the base sheet. The recording device includes a detection unit that detects the label.
In Patent Document 1, a detection means is provided that has a light emitting element and a light receiving element that are arranged with a recording medium sandwiched therebetween. In Patent Document 1, light emitted from the light emitting element passes through the recording medium toward the light receiving element, and the light receiving element receives the light and detects a change in the light receiving level, thereby detecting the recording medium. In Patent Document 1, a drive motor and a linear encoder are provided as means for moving the light emitting element and the light receiving element, respectively.

JP 2019-1158 A

In the device described in Patent Document 1, the provision of a drive motor and a linear encoder increases the cost and may increase the size of the device. In addition, in the device described in Patent Document 1, there is a risk that the detection accuracy of the detection means may decrease due to variations in the performance of the light-emitting element and the light-receiving element, misalignment of the mounting position, etc.

One aspect of the present disclosure includes a transport unit that transports a print medium in a transport direction, a print head that prints on the print medium on the transport path of the print medium, and a detection unit that detects an end of the print medium on the transport path of the print medium, the detection unit including a light-emitting unit that emits light and a light-receiving unit that receives the light emitted from the light-emitting unit, the light-emitting unit and the light-receiving unit being arranged to face each other across the print medium along the thickness direction of the print medium and being movable in a cross direction that intersects the transport direction, the light-emitting unit being provided with a first light-emitting element and a second light-emitting element of the same type, The first light-emitting element and the second light-emitting element are arranged in the intersecting direction with a predetermined interval between them, and a first light-emitting width is formed between the first light-emitting element and the second light-emitting element, extending along the intersecting direction and extending from the first light-emitting element to the second light-emitting element, which is an emission width at which the light receiving unit can receive the light emitted from the light-emitting unit with a signal strength of 90% or more, and the first light-emitting width is formed longer than a second light-emitting width, which is an emission width at which the light receiving unit can receive the light emitted from the one light-emitting element with a signal strength of 90% or more when the first light-emitting element is arranged on the optical axis of the light receiving unit.

FIG. 2 is a perspective view of the printing apparatus as viewed from the front side. FIG. FIG. 2 is a side view of a main portion showing each part relating to a transport path of the printing device. 4 is a rear view of the printing apparatus in a longitudinal section taken along plane IV in FIG. 2 ; FIG. 4 is a perspective view showing a fixed panel and a paper guide unit. 13 is a diagram showing the distribution of signal intensity of a light-emitting unit having one light-emitting element. 13 is a diagram showing the distribution of signal intensity of a light-emitting unit having two light-emitting elements. 13 is a diagram showing the distribution of signal intensity of a light-emitting unit having two light-emitting elements. 13 is a diagram showing the distribution of signal intensity of a light-emitting unit having two light-emitting elements.

Below, an embodiment of the present invention will be described with reference to the drawings. In the description, directions such as front, back, left, right, and up and down are the same as directions relative to the printing device 1 unless otherwise specified. Also, the symbol FR in each figure indicates the front of the printing device 1, the symbol UP indicates the top of the printing device 1, and the symbol LH indicates the left of the printing device 1.

Fig. 1 is a perspective view of a printing apparatus 1 as viewed from the front side. For convenience of explanation, an upper cover 17 is indicated by a two-dot chain line in Fig. 1. For convenience of explanation, a conveying direction F and a cross direction I are indicated by a one-dot chain line in Fig. 1.
As shown in FIG. 1, the printing device 1 is a so-called line-type inkjet printer that includes a line-shaped inkjet head and ejects ink from the inkjet head to print characters and images on a printing medium.

The printing medium used for printing with the printing device 1 is a cut sheet cut to a predetermined size or a continuous sheet. These sheets are made of paper, synthetic resin, etc. These sheets may be, for example, fine paper with a surface treatment that enhances the ink absorption and fixation properties, making it suitable for inkjet printing.

Examples of continuous sheets include roll paper that is stored in the printer 1 in a rolled state, and fanfold paper that is supplied to the printer 1 from outside the printer 1 in a folded state. Examples of roll paper include plain paper or fine paper rolled into a roll, as well as label paper made by arranging standard-sized labels with adhesive on the backing on a release paper and rolling them into a roll.

In this embodiment, labels 103 of a predetermined size with adhesive on the backing are placed on a mount on which a long release paper that can be peeled off from the adhesive is formed, and the rolled label paper 100 is used as the print medium. On the label paper 100, multiple labels 103 are arranged at equal intervals in the longitudinal direction of the mount 101. The printing device 1 transports the label paper 100 and prints characters and images on the printing surface of each label 103 on the label paper 100. In this case, the label paper 100 corresponds to the "print medium" and the "label medium".
The label paper 100, the mount 101, and the label 103 are shown in FIG. 3 and FIG. 5, which will be described later.

The printer 1 includes a device case 10, which is a roughly rectangular parallelepiped housing. The device case 10 is combined with side panels, a front panel, etc. to form the outer shell of the printer 1.

A display and operation panel 12 with a display and operation buttons arranged thereon is provided in the upper half toward the right side of the front of the device case 10. A slit-shaped paper outlet 14 extending in the left-right direction is formed in the front of the device case 10, approximately in the center toward the left side. In the printing device 1, printed label paper 100 is discharged from the paper outlet 14.

A paper cover 16 is provided on the left side of the device case 10, toward the rear and below, so that it can be opened and closed. As shown in FIG. 2, a storage section 20 is provided inside the paper cover 16. In the printing device 1, a roll of label paper 100 can be loaded into the storage section 20 by opening the paper cover 16.

Fig. 2 is a perspective view of the printing apparatus 1 as viewed from the rear side. Fig. 2 shows a state in which the upper cover 17 is open. For convenience of explanation, in Fig. 2, the conveying direction F and the intersecting direction I are indicated by dashed lines.
2, the device case 10 is provided with an upper cover 17 that extends from above the paper cover 16 to the top surface of the device case 10. The upper cover 17 is formed so as to be openable and closable by rotating about a hinge provided in the approximate center of the top surface of the device case 10. In the printing device 1, the storage unit 20 and each part related to transportation can be operated.

FIG. 3 is a side view of the main parts of the printing device 1, showing the various parts related to the transport path R.
As shown in FIG. 3 , the printing device 1 includes a storage unit 20 that stores label paper 100, a printing unit 22 that prints on the label paper 100, and a transport unit 24 that transports the label paper 100 from the storage unit 20 to the printing unit 22.
In the printing device 1, the storage unit 20 is provided on the rear side, and the printing unit 22 is provided on the front side of the storage unit 20. The transport unit 24 is provided below the printing unit 22.

The storage unit 20 includes a roll shaft 26 on which the label paper 100 is attached. The roll shaft 26 is a rod-shaped member that is rotatable in the circumferential direction. The label paper 100 is stored in the storage unit 20 by inserting the roll shaft 26 through the center of the roll of the label paper 100.
A drive device such as a motor may be connected to the roll shaft 26, and the roll shaft 26 may rotate in response to the drive of the drive device. In the printing device 1, the label paper 100 rotates as a result of the roll shaft 26 rotating.

In the printing device 1 , a transport path R is formed along which one end of the label paper 100 attached to a roll shaft 26 is pulled out and transported to the paper discharge outlet 14 .
In the transport path R, a tension lever 28 is attached above the label paper 100 stored in the storage section 20. As shown in Figures 2 and 3, the tension lever 28 is formed in a column shape extending in the left-right direction with a curved surface in the circumferential direction. The tension lever 28 applies tension to the label paper 100 to prevent it from sagging. One end of the label paper 100 is pulled upward and comes into contact with the tension lever 28, and after being bent by the tension lever 28, it extends forward.

2 and 3, a paper guide unit 30 is provided in front of the tension lever 28. The paper guide unit 30 guides the label paper 100 forward, and prevents the label paper 100 from skewing or shifting in the conveyance of the label paper 100.
The paper guide unit 30 comprises a lower guide member 32 that supports the label paper 100 from below, and a paper pressing member 34 that is located on the upper surface side of the label paper 100 .
The lower guide member 32 has a flat surface 33 extending in the front-rear direction. The flat surface 33 has a width dimension in the left-right direction that is longer than the width dimension of the label paper 100. The label paper 100 is placed on and supported by the flat surface 33 of the lower guide member 32.
The paper pressing member 34 is positioned above the label paper 100 facing the lower guide member 32, and prevents the continuous paper P from floating up. The label paper 100 is transported in the paper guide unit 30 while being sandwiched between the lower guide member 32 and the paper pressing member 34.

In front of the paper guide unit 30, there is a printing section 22 that prints on the label paper 100. The printing section 22 includes a platen 40 and a print head 42. In this embodiment, the print head 42 ejects four colors of ink, C (cyan), M (magenta), Y (yellow), and K (black), to form dots on the printing surface of the label 103. The print head 42 includes a nozzle section 41 that ejects K (black) ink, a nozzle section 43 that ejects C (cyan) ink, a nozzle section 45 that ejects M (magenta) ink, and a nozzle section 47 that ejects Y (yellow) ink. The nozzle sections 41 to 47 have a plurality of nozzles that eject ink arranged in rows in the width direction of the label paper 100. The nozzles of the nozzle sections 41 to 47 are arranged along the intersecting direction I that intersects with the transport direction F. In this embodiment, the intersecting direction I is a direction perpendicular to the transport direction F. The cross direction I coincides with the width direction of the label paper 100.

The print head 42 is a line inkjet head that can eject ink without scanning in the width direction of the label paper 100. Therefore, the nozzle row of the nozzle units 41 to 47 is formed to be at least as wide as or wider than the printable range of the label paper 100. In this embodiment, the printable range corresponds to the printing surface of the label 103.
In this embodiment, a configuration example is given in which the nozzle sections 41, 43, 45, and 47 are arranged in this order along the transport direction F of the label paper 100, but the order in which the nozzles of each color are arranged in the transport direction F is arbitrary.

The platen 40 has a flat surface that is arranged along the transport direction F. This flat surface is located below the transport path R and faces the print head 42. The nozzle portions 41 to 47 and the platen 40 are arranged with a gap therebetween, which is a so-called platen gap.
The platen 40 supports the label paper 100 from below. The platen 40 is provided across at least the entire printing range of the printing unit 22. The plane of the platen 40 is disposed substantially horizontally when the printing device 1 is installed and in use.

The transport section 24 includes a cylindrical transport roller 50. The transport roller 50 is arranged so that its longitudinal direction extends along the intersecting direction I, and is provided so as to be freely rotatable in the circumferential direction. The transport roller 50 is disposed in front of the paper guide unit 30 and at the rear end of the platen 40.

For example, a driven wheel is provided at one end of the transport roller 50. A transmission belt 51 is wound around the driven wheel. The transmission belt 51 is wound around a drive shaft of the transport motor 52. In this way, the transport roller 50 and the transport motor 52 are connected via the transmission belt 51.
The transport motor 52 is a drive device that rotates the transport roller 50. The transport motor 52 and the transmission belt 51 are provided below the platen 40.

The transport unit 24 includes a plurality of paper feed driven rollers 54. The plurality of paper feed driven rollers 54 are rotatably arranged along the longitudinal direction of the transport roller 50. Each of the paper feed driven rollers 54 is biased so that its circumferential surface contacts the circumferential surface of the transport roller 50. As a result, the transport roller 50 and the paper feed driven roller 54 are arranged to face each other.
Therefore, the transport roller 50 is disposed on the lower guide member 32 side, and the paper feed driven roller 54 is disposed on the paper pressing member 34 side.

In the conveying section 24, the conveying motor 52 is driven to rotate the conveying roller 50 via the transmission belt 51, and the paper feed driven roller 54 is driven to rotate. As a result, the label paper 100 loaded between the lower guide member 32 and the paper pressing member 34 is sandwiched between the conveying roller 50 and the paper feed driven roller 54, and is conveyed to the printing section 22 as the conveying roller 50 rotates.

The transport rollers 50 may be disposed on the lower guide member 32 side, in other words, on the platen 40 side. For example, the transport unit 24 may include a transport belt that can move on the upper surface of the platen 40 instead of the transport rollers 50.

A cutter unit 110 is disposed downstream of the print head 42, in other words, on the front side. The cutter unit 110 includes a fixed blade 112 and a movable blade 114 disposed on either side of the conveying path R, and the movable blade 114 is connected via a gear or the like to a drive device such as a motor that drives the cutter. When the motor is driven in the cutter unit 110, the movable blade 114 moves toward the fixed blade 112 and cuts the label paper 100. The cutter unit 110 may be one that cuts the label paper 100 in the width direction, leaving a portion uncut, or may be one that cuts the label paper 100 completely. The printing device 1 cuts the label paper 100 printed by the print head 42 to a predetermined length by the cutter unit 110, and discharges it from the paper discharge port 14.
The cutter unit 110 may be formed separately from the printing device 1 and may be detachably provided on the front surface of the printing device 1, for example.

3, the printing device 1 is provided with a label detector 70 on the transport path R. The label detector 70 detects the leading and trailing ends of the label paper 100 and the leading and trailing ends of the labels 103.
The label detector 70 in this embodiment is positioned downstream of the paper guiding unit 30 and upstream of the transport rollers 50. The label detector 70 is, for example, an optical transmission sensor that has a light-emitting unit 72 on the underside of the label paper 100 and a light-receiving unit 74 on the upper side of the label paper 100 on the transport path R. The light-emitting unit 72 and the light-receiving unit 74 are positioned opposite each other in the up-down direction with a gap large enough to allow the label paper 100 to pass through. In other words, the light-emitting unit 72 and the light-receiving unit 74 are positioned opposite each other in the thickness direction of the label paper 100. As a result, the light-emitting unit 72 and the light-receiving unit 74 are positioned at approximately the same position in the front-to-rear direction.

The label detector 70 may be disposed downstream of the transport rollers 50 and upstream of the print head 42 .
Also, for example, the light-emitting unit 72 may be disposed on the paper pressing member 34 side, and the light-receiving unit 74 may be disposed on the lower guide member 32 side. In this case, the light-emitting unit 72 may be disposed on the platen 40 side, and the light-receiving unit 74 may be disposed on the print head 42 side.
The label detector 70 corresponds to a "detection section." The leading and trailing ends of the label paper 100 and the leading and trailing ends of the label 103 correspond to the "edges of the print medium."

Fig. 4 is a rear view of the vertical section taken along plane IV in Fig. 2 as viewed from the rear of the printing device 1. Plane IV is a plane that is perpendicular to the front-rear direction and passes between the transport roller 50 and the fixed panel 60 in the front-rear direction of the printing device 1. Fig. 4 is a view of the vertical section taken along plane IV in Fig. 2 as viewed from the rear of the printing device 1, showing the label detector 70. In Fig. 4, the optical axis L1 of the first light-emitting element 76, the optical axis L2 of the second light-emitting element 78, and the optical axis L3 of the light-receiving element 79 are indicated by dashed dotted lines.
4, the light-emitting unit 72 includes two light-emitting elements, a first light-emitting element 76 and a second light-emitting element 78. The first light-emitting element 76 and the second light-emitting element 78 are, for example, light-emitting diodes (LEDs).
The light emitting section 72 is not limited to an LED, and may include other light emitting elements such as a semiconductor laser.

The first light emitting element 76 and the second light emitting element 78 use LEDs of the same type, and have substantially the same light distribution characteristics, light irradiation intensity, and the like.
In this embodiment, the first light emitting element 76 and the second light emitting element 78 each have a width dimension, which is a length dimension along the intersecting direction I, of 5 mm.
The first light-emitting element 76 and the second light-emitting element 78 are both disposed to emit light upward. Therefore, the optical axis L1 of the first light-emitting element 76 and the optical axis L2 of the second light-emitting element 78 both extend along the up-down direction.

In the light-emitting section 72, the first light-emitting element 76 and the second light-emitting element 78 are arranged side by side along the intersecting direction I. The first light-emitting element 76 and the second light-emitting element 78 are arranged along the intersecting direction I at a distance such that the distance between their optical axes is 5.3.0 mm.
In the following description, a midpoint M of the light-emitting section 72 is defined as a midpoint between the optical axis L1 of the first light-emitting element 76 and the optical axis L2 of the second light-emitting element 78 in the intersecting direction I.

The light receiving unit 74 includes a light receiving element 79. The light receiving element 79 may be, for example, a phototransistor, a photo IC, or a photodiode. When the light receiving element 79 receives light with a signal strength equal to or greater than a predetermined value, the light receiving element 79 outputs a detection voltage as an output value indicating the amount of received light according to the amount of received light. The signal strength of the light received by the light receiving element 79 may be, for example, illuminance.
The light receiving element 79 has an optical axis L3 extending in the vertical direction and is disposed so as to be able to receive light from below. In this embodiment, the optical axis L3 of the light receiving element 79 is the direction in which the light receiving element 79 has the highest sensitivity among the directions of light incident on the light receiving element 79.

In the label detector 70, the light emitting unit 72 and the light receiving unit 74 can be arranged at a position where the light receiving unit 74 can receive the light emitted from the light emitting unit 72 with a predetermined signal strength. In this case, the output value indicating the amount of light received by the light receiving element 79 is different depending on whether there is no label paper 100 directly below the light receiving element 79, whether there is a backing paper 101, or whether there is a label 103. In other words, the signal strengths of the light emitted from the first light emitting element 76 and the second light emitting element 78, the light transmitted through the backing paper 101, and the light transmitted through the label 103 are different from each other. Therefore, the label detector 70 can detect the leading and trailing ends of the label paper 100 and the leading and trailing ends of the label 103 by the output value indicating the amount of light received by the light receiving element 79.

The light emitted from the first light-emitting element 76 and the second light-emitting element 78 diffuses as it travels in the emission direction. Therefore, the distribution of the signal intensity of the light emitted from the first light-emitting element 76 and the second light-emitting element 78 decreases as it moves away from the optical axes L1, L2 of the first light-emitting element 76 and the second light-emitting element 78 in the left-right direction along the intersecting direction I. Therefore, in the label detector 70, as the first light-emitting element 76 and the second light-emitting element 78 move away from directly below the light-receiving element 79, in other words from the optical axis L3 of the light-receiving element 79 along the intersecting direction I, the signal intensity of the light received by the light-receiving element 79 decreases.

As described above, in the label detector 70, two light-emitting elements, the first light-emitting element 76 and the second light-emitting element 78, are arranged side by side along the intersecting direction I. In addition, the first light-emitting element 76 and the second light-emitting element 78 are arranged at a distance along the intersecting direction I such that the distance between their optical axes is 5.3.0 mm.

As a result, the light-emitting unit 72 has a first light-emitting width, which is an emission width at which the light-receiving element 79 can receive light with a signal strength equal to or greater than a predetermined value. The first light-emitting width in this embodiment extends along the intersecting direction I by a predetermined width dimension, and is a range in which the light-receiving element 79 can receive light emitted from the first light-emitting element 76 and the second light-emitting element 78 with a signal strength of 90% or more relative intensity at any position.

Here, the relative intensity will be explained.
In this embodiment, when viewed in a plane, the light-emitting unit 72 is positioned at a position where the midpoint M overlaps with the optical axis L3 of the light-receiving element 79, and the signal strength when the light emitted from the light-emitting unit 72 is received by the light-receiving element 79 is set to 100%.
In this embodiment, when the light-emitting unit 72 is positioned at any position along the intersecting direction I, the proportion of the signal intensity received by the light-receiving element 79 of the light emitted from the light-emitting unit 72 at that position relative to this 100% signal intensity is called the relative intensity.

If the relative intensity is 90% or more, the label detector 70 can detect the leading and trailing ends of the label paper 100 and the leading and trailing ends of the labels 103 while suppressing false detection.
In the light-emitting portion 72 of this embodiment, the width dimension of the light-emitting width where the relative intensity is 90% or more is approximately 4.0 mm.

Here, the light emitting width of the first light emitting element 76 will be described.
The first light-emitting element 76 has a second light-emitting width that is a light-emitting width that can be received by the light-receiving element 79 with a signal strength equal to or greater than a predetermined value. The second light-emitting width, like the first light-emitting width, extends by a predetermined width dimension along the intersecting direction I, and is a range in which the light emitted from the first light-emitting element 76 can be received by the light-receiving element 79 with a signal strength of 90% or more relative intensity.

This relative intensity is defined in the same way as the relative intensity of the light-emitting unit 72 described above. That is, in this embodiment, the signal intensity is 100% when the light-receiving element 79 receives light emitted from the first light-emitting element 76 in a state where the first light-emitting element 76 is disposed at a position where the optical axis L1 overlaps with the optical axis L3 of the light-receiving element 79 in a planar view. The relative intensity of the first light-emitting element 76 is the ratio of the signal intensity of the light received by the light-receiving element 79 of the light emitted from the light-emitting unit 72 at any position when the light-emitting unit 72 is disposed at that position along the intersecting direction I, relative to this 100% signal intensity.

If the relative intensity is 90% or more, the label detector 70 can detect the leading and trailing ends of the label paper 100 and the leading and trailing ends of the labels 103 while suppressing false detection.
In the first light emitting element 76 of this embodiment, the light emitting width at which the relative intensity is 90% or more is approximately 3.0 mm.
The second light emitting element 78 of the present embodiment has a light emitting width that is substantially the same as the second light emitting width.

In this way, the printing device 1 of this embodiment has a first light-emitting width that is a width dimension along the intersecting direction I that is longer than the second light-emitting width of each of the first light-emitting element 76 and the second light-emitting element 78. Therefore, even if the light-emitting unit 72 is positioned at a position that is shifted 2 mm to the left or right along the intersecting direction I with respect to the optical axis L3, the label detector 70 can detect the leading and trailing ends of the label paper 100 and the label 103 while suppressing false detection.

The first light-emitting element 76 and the second light-emitting element 78 may be arranged along the intersecting direction I with a distance between their optical axes greater than 5.0 mm and less than 6.0 mm. In the light-emitting section 72 in which the first light-emitting element 76 and the second light-emitting element 78 are arranged in this manner, the signal strength received by the light-receiving element 79 is the highest when the midpoint M is located directly below the light-receiving section 74.

As shown in FIG. 4, the first light-emitting element 76 and the second light-emitting element 78 are held by a light-emitting unit holding unit 80. The light-emitting unit holding unit 80 has a cylindrical shape, and covers the entire circumferential direction of the first light-emitting element 76 and the second light-emitting element 78 with the emission directions of the first light-emitting element 76 and the second light-emitting element 78 open. The light-emitting unit holding unit 80 is attached to the paper guide unit 30 so as to be movable along the intersecting direction I. This allows the first light-emitting element 76 and the second light-emitting element 78 to move together along the intersecting direction I.

Fig. 5 is a perspective view showing the fixed panel 60 and the paper guide unit 30. For ease of explanation, the label paper 100 is shown by two-dot chain lines in Fig. 5.
In this embodiment, the light-emitting unit holding unit 80 is attached to the front end of the lower guide member 32. As shown in Fig. 5, a first movement support unit 35 having, for example, a guide rail shape is provided at the front end of the lower guide member 32. This first movement support unit 35 is provided on the lower surface side of the lower guide member 32 and has a longitudinal direction extending along the intersecting direction I.

A positioning portion 37 is provided at the front end of the lower guide member 32, extending along the first moving support portion 35. The positioning portion 37 is formed in a so-called rack gear shape and has multiple teeth along the first moving support portion 35.

The front end of the lower guide member 32 is provided with a light-emitting unit display hole 39, which is a through hole that penetrates in the vertical direction. In a plan view of the lower guide member 32, the light-emitting unit display hole 39 has an elongated hole shape that extends in the transverse direction I, similar to the first moving support part 35.

The light-emitting unit holding unit 80 includes a slider-shaped moving unit 81. The moving unit 81 of the light-emitting unit holding unit 80 is attached to the first moving support unit 35 so that it can slide. This allows the light-emitting unit holding unit 80 to be attached to the front end of the lower guide member 32 so that it can move along the intersecting direction I.

The moving unit 81 is provided with a position display unit 83 and a light-emitting unit operation unit 85. The position display unit 83 protrudes upward from the moving unit 81 and is formed, for example, in a triangular shape in a plan view. The position display unit 83 is disposed at a position overlapping the midpoint M in the intersecting direction I.

The light-emitting unit operation unit 85 protrudes upward from the moving unit 81 to a position substantially identical to that of the position display unit 83. The light-emitting unit operation unit 85 and the moving unit 81 are disposed on the same straight line extending along the intersecting direction I.
The light-emitting operation unit 85 has an operation hole 87 that penetrates in the up-down direction. The operation hole 87 has a diameter dimension that allows, for example, the tip of a screwdriver or the tip of a pen to be inserted therethrough.

An operator 89 is provided at the lower end of the operation hole 87. The operator 89 is formed to be movable in the up and down direction, and moves downward when pressed by, for example, the tip of a pen inserted into the operation hole 87, and moves upward again when the pressure is released.
A claw-shaped portion 82 is connected to this operator 89. The claw-shaped portion 82 has a claw shape that protrudes in a predetermined direction from the moving portion 81. The claw-shaped portion 82 is formed so as to be able to mesh with the positioning portion 37. When the operator 89 is pressed, the claw-shaped portion 82 moves downward together with the operator 89. When the pressure on the operator 89 is released, the claw-shaped portion 82 moves upward again together with the operator 89.

When the moving unit 81 is attached to the first moving support unit 35 in the printing device 1, the position display unit 83 and the light-emitting unit operation unit 85 are inserted into the light-emitting unit display hole 39. The upper end of the position display unit 83 and the upper end of the light-emitting unit operation unit 85 are positioned so as not to protrude from the light-emitting unit display hole 39. The upper end of the position display unit 83 and the upper end of the light-emitting unit operation unit 85 are visible from above the printing device 1 when inserted into the light-emitting unit display hole 39.

In the printing device 1, when the moving portion 81 is attached to the first movement support portion 35, the claw-shaped portion 82 meshes with the positioning portion 37. As a result, the moving portion 81 is fixed to the front end portion of the lower guide member 32.
When the operating element 89 is pressed, the claw-shaped portion 82 moves downward relative to the positioning portion 37. In this state, the moving portion 81 and the light-emitting portion holding portion 80 become movable along the intersecting direction I. This allows the light-emitting portion 72 to move along the intersecting direction I.

In this way, in the printing device 1, the user can slide the light-emitting unit operation unit 85 along the light-emitting unit display hole 39 while pressing the operation element 89 with the tip of a pen or the like, thereby moving the light-emitting unit 72 along the intersecting direction I. In this case, the user can recognize the position of the light-emitting unit 72 that slides together with the light-emitting unit operation unit 85 by visually checking the position display unit 83.

Furthermore, in the printing device 1, when the user releases the pressure on the operator 89 after sliding it, the claw-shaped portion 82 again engages with the positioning portion 37. This makes it possible for the printing device 1 to fix the light-emitting portion 72 in the position where the user's pressure on the operator 89 is released. Therefore, in the printing device 1, it is possible to prevent the light-emitting portion 72 from shifting in position due to, for example, vibrations accompanying the operation of the printing device 1.

As shown in FIG. 4, the light receiving element 79 is held by the light receiving element holder 90. The light receiving element holder 90 is formed in a cylindrical shape and covers the entire circumferential direction of the light receiving element 79 with the emission direction of the light receiving element 79 open. The light receiving element holder 90 is attached to the fixed panel 60 so as to be movable along the intersecting direction I.

As shown in FIG. 2, the fixed panel 60 is a panel member that covers the printing unit 22 from the rear. The fixed panel 60 is positioned above the platen 40 and covers the print head 42 from the rear. The fixed panel 60 is positioned so that its plane is perpendicular to the front-to-rear direction and extends approximately vertically along the up-down direction. The fixed panel 60 is positioned between the paper guide unit 30 and the label detector 70 in the front-to-rear direction of the printing device 1. As shown in FIG. 5, the lower end of the fixed panel 60 is positioned opposite the front end of the upper surface of the lower guide member 32. The fixed panel 60 and the lower guide member 32 are positioned with a gap large enough to allow the label paper 100 to pass through.

In this embodiment, the light receiving unit holder 90 is attached to the fixed panel 60. As shown in Fig. 5, a second movement support unit 65 having, for example, a guide rail shape is provided on the fixed panel 60. The second movement support unit 65 is provided on the front side of the fixed panel 60, and its longitudinal direction extends along the intersecting direction I.
The fixed panel 60 is provided with a positioning portion 67 extending along the second movement support portion 65. The positioning portion 67 is formed in a so-called rack gear shape, and has a plurality of teeth along the second movement support portion 65.

The fixed panel 60 is provided with a light receiving unit display hole 69, which is a through hole penetrating along the front-to-rear direction, and an operation unit mating hole 63. When viewed from the rear of the printing device 1, the light receiving unit display hole 69 and the operation unit mating hole 63 have an elongated hole shape extending along the intersecting direction I, similar to the second movement support part 65. The light receiving unit display hole 69 and the operation unit mating hole 63 extend approximately parallel to each other on the fixed panel 60.
A scale 62 is engraved on the fixed panel 60 along the light receiving unit display hole 69 .

The light receiving unit holding unit 90 has a slider-shaped moving unit 91. The moving unit 91 of the light receiving unit holding unit 90 is attached to the second moving support unit 65 so that it can slide. This allows the light receiving unit holding unit 90 to be attached to the fixed panel 60 so that it can move along the intersecting direction I.

The moving unit 91 is provided with a position display unit 93 and a light receiving unit operation unit 95. The position display unit 93 protrudes upward from the moving unit 91 and is formed, for example, in a triangular shape in a plan view. The position display unit 93 is disposed at a position overlapping the optical axis L3 of the light receiving element 79 in the intersecting direction I.

The light receiver operation unit 95 protrudes upward from the moving unit 91 to a position substantially identical to that of the position display unit 93. The light receiver operation unit 95 and the moving unit 91 are disposed on the same straight line extending in the up-down direction.
The light receiving operation unit 95 has an operation hole 97 that penetrates in the front-rear direction. The operation hole 97 has a diameter dimension that allows, for example, the tip of a screwdriver or the tip of a pen to be inserted therethrough.

An operator 99 is provided at the front end of the operation hole 97. The operator 99 is formed to be movable in the front-rear direction, and moves forward when pressed by, for example, the tip of a pen inserted into the operation hole 97, and moves backward again when the pressure is released.
A claw-shaped portion 92 is connected to this operator 99. The claw-shaped portion 92 has a claw shape that protrudes in a predetermined direction from the moving portion 91. The claw-shaped portion 92 is formed so as to be able to mesh with the positioning portion 67. When the operator 99 is pressed, the claw-shaped portion 92 moves downward together with the operator 99. When the pressure on the operator 99 is released, the claw-shaped portion 92 moves upward again together with the operator 99.

When the moving unit 91 is attached to the second moving support unit 65 in the printing device 1, the position display unit 93 and the light receiving unit operation unit 95 are inserted into the light receiving unit display hole 69. The upper end of the position display unit 93 and the upper end of the light receiving unit operation unit 95 are positioned so as not to protrude from the light receiving unit display hole 69. The upper end of the position display unit 93 and the upper end of the light receiving unit operation unit 95 are visible from above the printing device 1 when inserted into the light receiving unit display hole 69.

In the printing device 1 , when the moving section 91 is attached to the second moving support section 65 , the claw-shaped sections 92 mesh with the positioning sections 67 . As a result, the moving section 91 is fixed to the fixed panel 60 .
When the operating element 99 is pressed, the claw-shaped portion 92 moves downward below the positioning portion 67. In this state, the moving portion 91 and the light-receiving portion holding portion 90 become movable along the intersecting direction I. This allows the light-receiving portion 74 to move along the intersecting direction I.

In this way, in the printing device 1, the light receiving unit 74 can be moved along the transverse direction I by moving the light receiving unit operation unit 95 along the light receiving unit display hole 69 in the transverse direction I while pressing the operation element 99 with the tip of a pen or the like. In this case, the user can recognize the position of the light emitting unit 72 that slides together with the light receiving unit operation unit 95 by visually checking the position display unit 93.

In addition, the user can easily visually confirm the amount of movement and position of the moving unit 91 and the light receiving unit 74 by moving the position display unit 93 so that it aligns with a predetermined position on the scale 62. The user may also move the position display unit 83 so that it aligns with a predetermined position on the scale 62.

Furthermore, in the printing device 1, when the user releases the pressure on the operator 99 after sliding it, the claw-shaped portion 92 again engages with the positioning portion 67. This allows the printing device 1 to fix the light receiving unit 74 at the position where the user's pressure on the operator 89 is released. Therefore, in the printing device 1, it is possible to prevent the light receiving unit 74 from shifting in position due to, for example, vibrations associated with the operation of the printing device 1.

In this manner, in the printing device 1, the light-emitting unit 72 and the light-receiving unit 74 are movably supported by different members.
This allows the printing device 1 to adjust the positions of the light-emitting section 72 and the light-receiving section 74 in the intersecting direction I individually.
In addition, in the printing device 1, it is possible to reduce the size of the members that movably support the light-emitting unit 72 and the light-receiving unit 74. Therefore, in the printing device 1, it is possible to reduce the space required for arranging the members involved in the movement of the light-emitting unit 72 and the light-receiving unit 74.

In addition, since the light-emitting unit 72 and the light-receiving unit 74 are moved manually by the user, there is no need to provide a driving device such as a motor. This makes it possible to prevent the printing device 1 from increasing in number of parts and to prevent the printing device 1 from becoming larger.

As shown in FIG. 2, the printing device 1 includes a control board 18 that controls each part of the printing device 1. The control board 18 includes a CPU, ROM, RAM, etc., which serve as an arithmetic execution unit. The ROM of the control board 18 stores firmware executable by the CPU, data related to the firmware, etc., in a non-volatile manner. The RAM also temporarily stores data related to the firmware executed by the CPU, etc. The control board 18 may include other peripheral circuits, etc. The control board 18 may include a storage unit that can store various programs and data, such as control programs and data related to these control programs, in a non-volatile manner.

The control board 18 is formed so as to be able to detect operations on the display/operation panel 12 and the conveyance amount of the label paper 100 .
The control board 18 is formed so as to be capable of controlling the driving devices provided in the printing device 1, such as the transport motor 52.
The control board 18 supplies voltage to the pump that supplies ink from the ink tank in the print head 42 and the piezoelectric elements provided in the nozzle portions 41 to 47 of the print head 42 to operate them. As a result, in the printing device 1, ink droplets are ejected from each nozzle of the nozzle portions 41 to 47 to form dots.

The control board 18 is configured to cause the first light-emitting element 76 and the second light-emitting element 78 to emit light and to be able to acquire the detection value of the label detector 70. The label detector 70 functions as a detection means in cooperation with the control board 18.

Next, the operation of this embodiment will be described.
In the printing device 1, the label paper 100 stored in the storage unit 20 is transported by the transport unit 24 to the printing unit 22, and each printing surface of the label 103 on the label paper 100 is printed. In the printing device 1, the leading and trailing ends of the label 103 on the label paper 100 are detected by the label detector 70. Specifically, when the leading or trailing end of the label 103 passes through the light receiving element 79, the detection value of the label detector 70 changes. Based on the change in the detection value of the label detector 70, the control board 18 detects that the leading or trailing end of the label 103 has reached the arrangement position of the label detector 70. In the printing device 1, printing is performed on the label 103 based on the detection of the label detector 70.

Here, the label 103 may have a triangular or diamond shape in a plan view. In this case, the label 103 has a protruding portion that protrudes further than other portions as the tip.
For this reason, when printing on label paper 100 having such labels 103, the printer 1 needs to move the label detector 70 to a position where it overlaps the leading edge of the label 103 in a plan view.

In this embodiment, the label paper 100 stored in the storage section 20 is pulled out, and the leading edge of the label 103 is positioned in the gap between the fixed panel 60 and the front edge of the upper surface of the lower guide member 32. In this state, the user checks the position of the label 103 in the cross direction I.
Thereafter, the user operates the light-receiving unit operation unit 95 to move the light-receiving unit 74 to a position corresponding to the tip of the label 103. Similarly, the user operates the light-emitting unit operation unit 85 to move the light-emitting unit 72 to a position corresponding to the tip of the label 103.

As a result, even if the label 103 has a protrusion that protrudes further than other parts at its tip, the printer 1 can detect the tip by moving the label detector 70 to a position that overlaps the tip in a plan view. This allows the printer 1 to print on a wider variety of label 103 shapes.

As described above, the light-emitting unit 72 and the light-receiving unit 74 are moved along the intersecting direction I by the user as viewed by the user. For this reason, in the printing device 1, when the light-emitting unit 72 and the light-receiving unit 74 are moved by the user, the midpoint M may be positioned in a position that does not overlap the optical axis L3 in a planar view. In other words, in the printing device 1, the light-emitting unit 72 may be positioned in a position different from the position where the light-receiving unit 74 can receive light with the highest light intensity.

In this embodiment, in the light-emitting section 72, a first light-emitting element 76 and a second light-emitting element 78 are arranged along the intersecting direction I at a distance such that the distance between their optical axes is 5.3.0 mm.
As a result, the width dimension of the light emission width at which the relative intensity is 90% or more is about 4.0 mm in the light-emitting unit 72. Therefore, even if the light-emitting unit 72 is disposed at a position shifted by about 2 mm to the left or right along the cross direction I with respect to the optical axis L3, the label detector 70 can detect the leading end of the label 103 while suppressing erroneous detection.

Next, an experiment conducted by the inventors to set the light emitting width of the light emitting portion 72 of this embodiment will be described.
Fig. 6 is a diagram showing the distribution of signal intensity of a light-emitting unit having one light-emitting element. In Fig. 6, the horizontal axis X indicates the position along the intersecting direction I, and the vertical axis Y indicates the relative intensity. In Fig. 6, the optical axis of the light-emitting element is located at 0 mm on the X axis.
First, the inventors measured the light-emitting width of the light-emitting portion 72 when the light-emitting portion 72 includes one light-emitting element. This light-emitting element is the same type of light-emitting element as the first light-emitting element 76 and the second light-emitting element 78.
6, with this light-emitting element, the light emission width at which the relative intensity is 90% or more is about 3.0 mm along the transverse direction I. For this reason, with a label detector equipped with one light-emitting element, if the position of the light-emitting unit 72 shifted to the left or right along the transverse direction I with respect to the optical axis L3 is within 1.5 mm, it is possible to detect the leading and trailing ends of the label paper 100 and the label 103.
In FIG. 6, the light emission width of about 3.0 mm where the relative intensity is 90% or more corresponds to an example of the above-mentioned second light emission width.

Fig. 7 is a diagram showing the distribution of signal intensity of a light-emitting unit having two light-emitting elements. Fig. 7 shows the distribution of signal intensity of a light-emitting unit 72 in which a first light-emitting element 76 and a second light-emitting element 78 are arranged adjacent to each other. In Fig. 7, the position of the midpoint M of the light-emitting unit is indicated by a dashed line.
Next, the inventors measured the light-emitting width of the light-emitting section when the light-emitting section includes two light-emitting elements, a first light-emitting element 76 and a second light-emitting element 78 .
The inventors measured the light-emitting width of the light-emitting portion when the first light-emitting element 76 and the second light-emitting element 78 were arranged side by side in the intersecting direction I in a state of abutting against each other.
7, when the first light-emitting element 76 and the second light-emitting element 78 are arranged side by side in abutting contact with each other along the intersecting direction I, the light-emitting section has an emission width of about 3.0 mm along the intersecting direction I where the relative intensity is 90% or more. Therefore, the light-emitting section has approximately the same emission width as a light-emitting section having one light-emitting element.

Fig. 8 is a diagram showing the distribution of signal intensity of a light-emitting unit 72 having two light-emitting elements. Fig. 8 shows the distribution of signal intensity of a light-emitting unit 72 in which a first light-emitting element 76 and a second light-emitting element 78 are arranged at a distance of 5.3.0 mm between the optical axes of the first light-emitting element 76 and the second light-emitting element 78 along the intersecting direction I.
Next, the inventors measured the light-emitting width of the light-emitting section 72, in which the first light-emitting element 76 and the second light-emitting element 78 are arranged side by side at a predetermined distance along the intersecting direction I, by changing the distance.

8, in the light-emitting unit 72 in which the first light-emitting element 76 and the second light-emitting element 78 are arranged with a distance between their optical axes of 5.3.0 mm, the light-emitting width at which the relative intensity is 90% or more is approximately 4.0 mm along the intersecting direction I. For this reason, the label detector 70 can detect the leading and trailing ends of the label paper 100 and the label 103 as long as the position of the light-emitting unit 72 shifted to the left or right along the intersecting direction I with respect to the optical axis L3 is within 2.0 mm.
In FIG. 8, the light emission width of about 4.0 mm where the relative intensity is 90% or more corresponds to an example of the first light emission width described above.

Fig. 9 is a diagram showing the distribution of signal intensity of a light-emitting unit having two light-emitting elements, in which a first light-emitting element 76 and a second light-emitting element 78 are arranged at a distance of 6.0 mm between their optical axes along the intersecting direction I.
Next, the inventors measured the light-emitting width of a light-emitting section in which a first light-emitting element 76 and a second light-emitting element 78 were arranged with a gap of 6.0 mm between their optical axes.
As shown in FIG. 9, in the light-emitting section, a location was generated between the first light-emitting element 76 and the second light-emitting element 78 along the intersecting direction I where the relative intensity was less than 90%.

From these results, the inventors have discovered that when the first light-emitting element 76 and the second light-emitting element 78 are arranged along the intersecting direction I with the distance between their optical axes being longer than 5.0 mm and shorter than 6.0 mm, the width dimension of the light-emitting width of the light-emitting portion can be improved.
In other words, when two light-emitting elements are arranged in the light-emitting section with the distance between their optical axes longer than 5.0 mm and shorter than 6.0 mm apart, an emission width having a relative intensity of 90% or more longer than 3.0 mm is formed along the direction in which the two light-emitting elements are aligned.
As a result, the inventors discovered that by arranging the first light-emitting element 76 and the second light-emitting element 78 as described above, it is possible to form a light-emitting section with a longer light-emitting width and a relative intensity of 90% or more than that of a light-emitting section equipped with a single light-emitting element.

The above embodiments merely show specific examples of application of the present invention. The present invention is not limited to the configurations of the above embodiments, and can be implemented in various forms without departing from the gist of the invention.

For example, in the above-described embodiment, the light-emitting unit 72 includes two light-emitting elements, the first light-emitting element 76 and the second light-emitting element 78. However, the present invention is not limited to this, and the light-emitting unit 72 may include one light-emitting element having a light-emitting width of 3.1 mm or more along the intersecting direction I.
Furthermore, for example, the light-emitting section 72 may include one light-emitting element and an optical member such as a lens capable of diffusing the light-emitting width of the light-emitting element along the intersecting direction I to 3.1 mm or more.

In the embodiment described above, the printing device 1 has the scale 62 engraved along the light receiving unit display hole 69. However, this is not limited to the above, and the printing device 1 may have the scale 62 engraved along the light emitting unit display hole 39. Also, for example, the printing device 1 may have the scale 62 engraved along both the light receiving unit display hole 69 and the light emitting unit display hole 39.

In the above-described embodiment, a label printer has been given as an example of the printing device 1. However, the printing device 1 is not limited to a label printer. The printing device 1 may be any device that includes a transport mechanism for transporting a print medium and a printing unit for printing on the print medium. For example, the printing device 1 may be a large format printer or a textile printing machine for printing textiles.

In the above-described embodiment, a line head type print head 42 is exemplified, but this is not limited to the above and a serial head type may also be used. Furthermore, the printing method of the print head 42 is not limited to the inkjet type.

The printing device 1 may be provided with a paper detector behind the paper guide unit 30, in other words, upstream. This paper detector may be a transmission type sensor with a light emitting portion on the paper pressing member 34 side and a light receiving portion on the lower guide member 32 side, like the label detector 70. The output value indicating the amount of light received by this paper detector differs depending on whether or not label paper 100 is present at the position of the paper detector. This allows the printing device 1 to detect the leading and trailing ends of label paper 100 using the paper detector. The output value is, for example, a detection voltage.

In the above-described embodiments, the horizontal, vertical, and other directions, various numerical values, and shapes include the so-called equivalent range that provides the same effect as those directions, numerical values, and shapes, unless otherwise specified.

[Summary of the Disclosure]
The following is a summary of this disclosure.

(Appendix 1)
a transport unit that transports a print medium in a transport direction, a print head that prints on the print medium on the transport path of the print medium, and a detection unit that detects an edge of the print medium on the transport path of the print medium, the detection unit having a light-emitting unit that emits light and a light-receiving unit that receives the light emitted from the light-emitting unit, the light-emitting unit and the light-receiving unit being disposed opposite each other along a thickness direction of the print medium with the print medium therebetween and being movable in a cross direction that is a direction that intersects the transport direction, the light-emitting unit being provided with a first light-emitting element and a second light-emitting element of the same type, A printing device in which an optical element and the second light-emitting element are arranged side by side in the intersecting direction with a predetermined interval therebetween, and a first light-emitting width is formed between the first light-emitting element and the second light-emitting element, extending along the intersecting direction and extending from the first light-emitting element to the second light-emitting element, which is an emission width at which the light receiving unit can receive light emitted from the light-emitting unit with a signal strength of 90% or more, and the first light-emitting width is formed longer than a second light-emitting width, which is an emission width at which the light receiving unit can receive light emitted from the first light-emitting element with a signal strength of 90% or more when the first light-emitting element is arranged on the optical axis of the light receiving unit.
This allows the detection unit to detect the edge of the print medium while suppressing false detections, even if the light-emitting unit is positioned at a position offset from the optical axis of the light-receiving unit along the intersecting direction.

(Appendix 2)
2. The printing device described in claim 1, comprising: a first movable support portion that supports the light-emitting portion so that the light-emitting portion can move in the intersecting direction; and a second movable support portion that supports the light-receiving portion so that the light-receiving portion can move in the intersecting direction.
This allows the printing device to individually adjust the positions of the light-emitting section 72 and the light-receiving section 74 in the intersecting direction.

(Appendix 3)
3. The printing device according to claim 2, wherein at least one of the first movement support portion and the second movement support portion is provided with a scale extending in the intersecting direction.
As a result, in the printing device, by moving at least one of the light-emitting unit and the light-receiving unit to align with a specified position on the scale, the amount of movement and position of at least one of the light-emitting unit and the light-receiving unit can be easily visually confirmed.

(Appendix 4)
5. The printing device according to claim 1, wherein the print medium is a label medium having a backing and a label attached to the backing.
This allows the detection unit to detect the edge of the label medium or label while suppressing false detections, even if the light-emitting unit is positioned at a position offset from the optical axis of the light-receiving unit along the intersecting direction.

1...printing device, 10...device case, 14...paper exit, 20...storage section, 22...printing section, 24...transport section, 26...roll shaft, 28...tension lever, 30...paper guide unit, 32...lower guide member, 33...flat surface, 34...paper pressing member, 40...platen, 41...nozzle section, 42...print head, 43...nozzle section, 45...nozzle section, 47...nozzle section, 50...transport roller, 51...transmission belt, 52...transport motor, 54...paper feed driven roller, 60...fixed panel, 70...label detector, 72...light emitting section, 74...light receiving section, 100...label paper, 110...cutter unit, 112...fixed blade, 114...movable blade, F...transport direction, I...cross direction, R...transport path.

Claims (4)

a transport unit that transports the print medium in a transport direction;
a print head that prints on the print medium along a transport path of the print medium;
a detection unit that detects an edge of the print medium on a transport path of the print medium;
Equipped with
The detection unit includes a light emitting unit that emits light and a light receiving unit that receives the light emitted from the light emitting unit,
the light-emitting unit and the light-receiving unit are disposed in a thickness direction of the print medium, facing each other with the print medium therebetween, and are provided to be movable in a cross direction that crosses the transport direction;
The light emitting unit is provided with a first light emitting element and a second light emitting element of the same type,
The first light emitting element and the second light emitting element are arranged side by side in the intersecting direction at a predetermined interval,
Between the first light-emitting element and the second light-emitting element, a first light-emitting width is formed, which extends along the intersecting direction and is a light-emitting width in which the light-receiving unit can receive light emitted from the light-emitting unit with a signal intensity of 90% or more from the first light-emitting element to the second light-emitting element,
A printing device, wherein the first light-emitting width is formed to be longer than a second light-emitting width, which is an emission width that allows the light-receiving unit to receive light emitted from the first light-emitting element with a signal intensity of 90% or more when the first light-emitting element is positioned on the optical axis of the light-receiving unit. a first movable support portion that supports the light emitting portion so as to be movable in the intersecting direction;
a second movement support portion that supports the light receiving portion so as to be movable in the intersecting direction;
The printing device according to claim 1 . The printing device according to claim 2 , wherein at least one of the first movement support portion and the second movement support portion is provided with a scale extending in the intersecting direction. The printing device according to claim 1 or 2, wherein the print medium is a label medium having a backing and a label attached to the backing.

Images