Printer device

Abstract

To provide a printer device capable of accurately detecting a remaining quantity of sheets regardless of a width of roll paper.SOLUTION: A thermal printer (printer device) comprises: a first flapper in which one end side is installed rotatably around a first rotary shaft in a state of being energized to the inside of an upper cover (main body cover) in a direction away from the upper cover, and the other end side comes into contact with an outer peripheral surface of roll paper; a second flapper in which one end side is installed rotatably around a second rotary shaft parallel to the first rotary shaft installed in a lower housing, and the other end side is installed slidable with the first flapper according to an angle of the first flapper at a center part of the first flapper; and a photosensor (remaining quantity detection part) which detects a remaining quantity of the roll sheet based upon an angle of the second flapper.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a printer device. [Background technology]

[0002] In stores and other places, there are cases where information is printed using a thermal printer while the printing paper is pulled out from a roll of printing paper. Recently, there have also been cases where rolls of label paper without a liner are used as the printing paper. Furthermore, to reduce the effort required for changing printing paper, a so-called drop-in system has been proposed, which allows the printer to load the paper simply by inserting the roll into the printer's storage compartment.

[0003] In drop-in printers like this, the roll paper core is not fixed, so when the printing paper is peeled off the roll paper, the roll paper is pulled in the paper ejection direction, causing it to move irregularly inside the printer, making it difficult to accurately measure the remaining amount of printing paper.

[0004] For this reason, there is a known example in which the roll paper is prevented from moving by pressing the roll paper from the downstream side (paper discharge side) toward the upstream side (roll paper side) with a pressure roller (for example, Patent Document 1).

[0005] However, in the printer disclosed in Patent Document 1, a sensor that detects the remaining amount of roll paper is installed in the roll paper storage compartment. Patent Document 1 does not mention detecting the remaining amount regardless of the width of the roll paper when the width of the roll paper used for printing is changed. There is a need for a function that can accurately detect the remaining amount of roll paper even when the width of the roll paper is changed. Summary of the Invention [Problem to be solved by the invention]

[0006] The problem to be solved by the present invention is to provide a printer device that can accurately detect the amount of paper remaining regardless of the width of the roll paper. [Means for solving the problem]

[0007] The printer device of this embodiment has an openable main body cover and a lower housing. When the main body cover is opened, roll paper is inserted. The printer device also includes a first flapper, a second flapper, and a remaining paper detector. One end of the first flapper is rotatably mounted around a first pivot shaft inside the main body cover, biased away from the main body cover, and the other end abuts the outer surface of the roll paper. One end of the second flapper is rotatably mounted around a second pivot shaft attached to the lower housing and parallel to the first pivot shaft, and the other end is mounted at the center of the first flapper so as to slide relative to the first flapper depending on the angle of the first flapper. The remaining paper detector detects the remaining amount of roll paper based on the angle of the second flapper. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an example of the appearance of a thermal printer according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing an example of a state in which the top cover of the thermal printer is open. [Figure 3] FIG. 3 is a YZ cross-sectional view of the thermal printer according to the embodiment taken along the cutting line GG. [Figure 4A] FIG. 4A is a first perspective view showing an example of the appearance of a first flapper and a second flapper included in the thermal printer according to the embodiment. [Figure 4B] FIG. 4B is a second perspective view showing an example of the appearance of the first flapper and the second flapper included in the thermal printer according to the embodiment. [Figure 5A]FIG. 5A is a diagram showing an example of the positional relationship between the second flapper and the photosensor when there is a sufficient amount of roll paper remaining in the thermal printer according to the embodiment. [Figure 5B] FIG. 5B is a diagram showing an example of the positional relationship between the second flapper and the photosensor when there is little roll paper remaining in the thermal printer according to the embodiment. [Figure 6A] FIG. 6A is a first diagram illustrating a method for detecting the remaining amount of roll paper using a photosensor. [Figure 6B] FIG. 6B is a second diagram illustrating how the photosensor detects the remaining amount of roll paper. [Figure 7A] FIG. 7A is a side view showing an example of a state in which the thermal printer according to the embodiment is using wide roll paper. [Figure 7B] FIG. 7B is a side view showing an example of the thermal printer according to the embodiment when narrow roll paper is used. [Figure 8A] FIG. 8A is a first diagram illustrating the opening and closing mechanism of the upper cover. [Figure 8B] FIG. 8B is a second diagram illustrating the opening and closing mechanism of the upper cover. [Figure 8C] FIG. 8C is a third diagram illustrating the opening and closing mechanism of the upper cover. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Embodiment) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A thermal printer according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0010] (Overall configuration of a thermal printer) The schematic configuration of a thermal printer 10 according to a first embodiment will be described using Figures 1 and 2. Figure 1 is a perspective view showing an example of the appearance of a thermal printer according to an embodiment. Figure 2 is a perspective view showing an example of the thermal printer with its top cover open. The thermal printer 10 is an example of a printer device in the present disclosure.

[0011] As shown in FIG. 1, the thermal printer 10 includes a lower housing 11, an upper cover 12, and a paper discharge port 13. The lower housing 11 is a box-shaped container with an opening on one side. The lower housing 11 is provided with a connection terminal (not shown) used to connect to an external device such as a host computer that manages the thermal printer 10, a power terminal (not shown) that supplies power to the printer body, and the like. As shown in FIG. 2, the upper cover 12 opens and closes the storage section 18. The upper cover 12 is supported at the Y-axis negative side end of the lower housing 11 so as to be rotatable around a rotation axis along the X-axis, and opens and closes the storage section 18 of the lower housing 11 as it rotates. The upper cover 12 is an example of a main body cover in this disclosure.

[0012] As shown in FIG. 2, the thermal printer 10 stores roll paper 51, which is thermal paper 50, an example of printing paper, wound around a roll core 52, in a storage section 18 inside the lower housing 11, and performs printing while pulling out the thermal paper 50 from the roll paper 51.

[0013] The thermal printer 10 includes a lower housing 11 therein, which includes a first flapper 20, a second flapper 30, a platen roller 16, a thermal head 17, and a storage section 18.

[0014] The thermal printer 10 pulls out the thermal paper 50 from the roll paper 51 by rotating the platen roller 16. The thermal printer 10 then performs printing by bringing the thermal head 17 into contact with the pulled-out thermal paper 50.

[0015] The first flapper 20 and second flapper 30 are rotatably installed on the back side of the upper cover 12. The first flapper 20 abuts against the outer surface of the paper roll 51, pressing the paper roll 51 against the inner wall of the storage section 18. This prevents the paper roll 51 from moving inside the storage section 18. The second flapper 30 rotates together with the first flapper 20 toward the paper roll 51. The structure and function of the first flapper 20 and second flapper 30 will be described in detail below.

[0016] The platen roller 16 is installed along the X-axis on the rear side of the upper cover 12 and is driven to rotate by a stepping motor 19 (see FIG. 3). When driven to rotate, the platen roller 16 transports the thermal paper 50 pulled out from one end of the roll paper 51 from the storage section 18 on the upstream side toward the thermal head 17 on the downstream side.

[0017] The thermal head 17 is installed on the inner surface of the lower housing 11. When the upper cover 12 is closed, the thermal head 17 comes into close contact with the platen roller 16. The thermal paper 50 is conveyed toward the paper discharge outlet 13 while being sandwiched between the thermal head 17 and the platen roller 16. The thermal head 17 has a structure in which multiple heating elements are aligned, and prints on the thermal paper 50 sandwiched between the thermal head 17 and the platen roller 16 by heating the heating elements corresponding to the print pattern.

[0018] The storage section 18 stores roll paper 51 wound in a roll shape.

[0019] (Internal structure of a thermal printer) The internal structure of the thermal printer 10 will be described with reference to Figure 3. Figure 3 is a YZ cross-sectional view of the thermal printer according to the embodiment taken along line GG.

[0020] The platen roller 16 is installed along the X-axis on the rear side of the upper cover 12 and is driven to rotate in the direction of arrow A by a stepping motor 19. By being driven to rotate in the direction of arrow A, the platen roller 16 transports thermal paper 50 pulled out from one end of the roll paper 51 from the storage section 18 on the upstream side toward the thermal head 17 on the downstream side.

[0021] One end (positive side of the Y axis) of the first flapper 20 is installed inside the upper cover 12 so as to be rotatable around a first rotation shaft 21 along the X axis. The first flapper 20 is biased by a torsion spring 25 installed on the first rotation shaft 21 in a direction away from the upper cover 12, i.e., in the direction of arrow C shown in Figure 3. The other end (negative side of the Y axis) of the first flapper 20 abuts against the outer surface of the roll paper 51.

[0022] One end (negative side of the Y axis) of the second flapper 30 is installed in the lower housing 11 so as to be rotatable around a second rotation shaft 31 along the X axis. That is, the first rotation shaft 21 and the second rotation shaft 31 are installed in parallel. The other end (positive side of the Y axis) of the second flapper 30 is installed in a connecting portion 22 formed in the center of the first flapper 20 so as to be slidable relative to the first flapper 20 in accordance with the angle of the first flapper 20. More specifically, the other end of the second flapper 30 is installed in a long-hole-shaped connecting hole 23 formed inside the connecting portion 22 by a connecting member 32 so as to be slidable.

[0023] A photosensor 40 (see Figures 5A and 5B for details) is installed inside the lower housing 11 to detect when the remaining amount of roll paper 51 is low. The photosensor 40 is configured, for example, as a photointerrupter made up of a light transmitting section and a light receiving section, and detects the position of the second flapper 30, which changes depending on the remaining amount of roll paper 51. More specifically, the photosensor 40 is installed inside the lower housing 11, facing near the base of the second flapper 30 on the second rotation shaft 31 side, and detects the angle of the second flapper 30 as it rotates around the second rotation shaft 31.

[0024] (Flapper structure) The structures of the first flapper 20 and the second flapper 30 will be described using Figures 4A and 4B. Figure 4A is a first perspective view showing an example of the appearance of the first flapper and the second flapper provided in the thermal printer according to the embodiment. Figure 4B is a second perspective view showing an example of the appearance of the first flapper and the second flapper provided in the thermal printer according to the embodiment.

[0025] 4A and 4B, the first flapper 20 has a bearing 28 into which the first rotating shaft 21 is inserted. A torsion spring 25 (see FIG. 8A) is installed around the first rotating shaft 21. The torsion spring 25 biases the first flapper 20 in the negative direction of the Z axis (downward in FIG. 3), that is, in the direction in which it abuts against the roll paper 51.

[0026] 4A and 4B, the second flapper 30 includes two parallel bifurcated support members extending along the Y-axis direction from near both ends of the second rotating shaft 31. A shaft-shaped connecting member 32 extending along the X-axis is attached to the tip of the support member. The connecting member 32 is inserted into two connecting portions 22 formed on the first flapper 20 and slides along a connecting hole 23 formed inside the connecting member 32. When the first flapper 20 rotates around the first rotating shaft 21, the connecting member 32 slides along the connecting hole 23, causing the second flapper 30 to rotate around the second rotating shaft 31. As a result, the second flapper 30 moves to a position corresponding to the rotation position of the first flapper 20.

[0027] That is, the second flapper 30 assumes a position corresponding to the position of the outer surface of the roll paper 51 where the tip of the first flapper 20 abuts, i.e., the amount of roll paper 51 remaining. A protrusion 33 attached to the base of the second flapper 30 on the side of the second rotating shaft 31 moves to a position corresponding to the position of the second flapper 30. A photosensor 40 (described below) detects that the second flapper 30 has assumed a predetermined position by outputting a signal corresponding to the position of the protrusion 33. This allows the thermal printer 10 to detect that the amount of roll paper 51 remaining is low.

[0028] (Structure of remaining amount detection unit) The structure of the remaining amount detection unit will be described using Figures 5A and 5B. Figure 5A is a diagram showing an example of the positional relationship between the second flapper and the photosensor when there is a sufficient amount of roll paper remaining in the thermal printer according to the embodiment. Figure 5B is a diagram showing an example of the positional relationship between the second flapper and the photosensor when there is only a small amount of roll paper remaining in the thermal printer according to the embodiment.

[0029] 5A, a protrusion 33 is formed on the end of the second flapper 30 on the side of the second rotation shaft 31. The protrusion 33 is a plate-shaped member that extends along the YZ plane, and its position moves as the second flapper 30 rotates around the second rotation shaft 31.

[0030] As shown in Fig. 5A, a photosensor 40 is installed in a position overlapping with the movement area of ​​the protrusion 33. As shown in Fig. 5B, the photosensor 40 is installed in a position overlapping with the protrusion 33 when the second flapper 30 is in the position when the remaining amount of roll paper 51 is low. More specifically, the photosensor 40 is installed facing the area whose position changes depending on the position of the second flapper 30.

[0031] In this way, based on the positional relationship between the protrusion 33 located at the base of the second flapper 30 and the photosensor 40, it is possible to easily and reliably detect that the remaining amount of roll paper 51 is low.

[0032] Next, we will explain how the photosensor 40 detects the remaining amount of roll paper 51 using Figures 6A and 6B. Figure 6A is a first diagram explaining how the photosensor detects the remaining amount of roll paper. Figure 6B is a second diagram explaining how the photosensor detects the remaining amount of roll paper.

[0033] 6A shows the relative positions of the second flapper 30 and photosensor 40 when the remaining amount of roll paper 51 has not reached a predetermined amount (i.e., there is a sufficient amount of roll paper 51 remaining). FIG. 6B shows the relative positions of the second flapper 30 and photosensor 40 when the remaining amount of roll paper 51 has reached a predetermined amount (i.e., there is not much roll paper 51 remaining).

[0034] In this embodiment, one end of the approximately U-shaped photosensor 40 is equipped with a light-emitting unit 42, and the other end is equipped with a light-receiving unit 43. The light-emitting unit 42 is formed, for example, by a light-emitting diode (LED). The light-emitting unit 42 emits light 60 toward the light-receiving unit 43. The light-receiving unit 43 is formed, for example, by a photodiode. When the light-receiving unit 43 receives light 60 from the light-emitting unit 42, it outputs a signal corresponding to the amount of light received. In FIGS. 6A and 6B, the positions of the light-emitting unit 42 and the light-receiving unit 43 may be reversed.

[0035] 6A, if the remaining amount of roll paper 51 has not reached a predetermined amount, there is nothing blocking the light 60 in the space between the light-emitting unit 42 and the light-receiving unit 43 of the photosensor 40, so the light-receiving unit 43 receives the light 60 emitted by the light-emitting unit 42. In this case, the light-receiving unit 43 receives the light 60 emitted by the light-emitting unit 42 and outputs a signal corresponding to the amount of light 60 received.

[0036] 6B, when the remaining amount of roll paper 51 has reached a predetermined amount, the protrusion 33 of the second flapper 30 is present in the space between the light-emitting element 42 and the light-receiving element 43 of the photosensor 40. Therefore, the light-receiving element 43 does not receive the light 60 emitted by the light-emitting element 42. In this case, the light-receiving element 43 does not output a signal.

[0037] In this way, by detecting the protrusion 33, the photosensor 40 can detect when the remaining amount of roll paper 51 has reached a predetermined amount, that is, when the remaining amount of roll paper 51 is low.

[0038] When the photosensor 40 detects that the remaining amount of roll paper 51 is low, the thermal printer 10 lights or flashes an indicator (not shown) to notify the user that a predetermined amount of roll paper 51 is remaining. Alternatively, the thermal printer 10 notifies a connected host computer (not shown) that the remaining amount of roll paper 51 is low. When the user receives this notification, they can prepare a replacement roll paper 51 in advance.

[0039] Note that while the example shown here is a transmissive photosensor 40 in which the light-emitting unit 42 and the light-receiving unit 43 are positioned opposite each other, it is also possible to detect the remaining amount of roll paper 51 using a reflective photosensor in which the light-emitting unit 42 and the light-receiving unit 43 are positioned on the same side. In this case, when the remaining amount of roll paper 51 is low, light 60 emitted by the light-emitting unit 42 is reflected by the protrusions 33 and reaches the light-receiving unit 43, increasing the level of the signal output by the light-receiving unit 43. On the other hand, when the remaining amount of roll paper 51 is high, light 60 emitted by the light-emitting unit 42 is not reflected by the protrusions 33, so less reflected light reaches the light-receiving unit 43 and the level of the signal output by the light-receiving unit 43 decreases.

[0040] (Operation according to roll paper width) 7A and 7B, the operation of the thermal printer 10 for wide roll paper 61 and narrow roll paper 62 will be described. Fig. 7A is a side view showing an example of the thermal printer according to the embodiment when using wide roll paper. Fig. 7B is a side view showing an example of the thermal printer according to the embodiment when using narrow roll paper.

[0041] When using the thermal printer 10 to print on roll paper of different widths, the operator changes the positions of the two support plates 36 shown in Figures 7A and 7B. The support plates 36 prevent the roll paper from shifting in the width direction.

[0042] That is, when a wide roll paper 61 is used, as shown in Figure 7A, the support plate 36 prevents the roll paper 61 from moving in the width direction. The first flapper 20 and the second flapper 30 also prevent the roll paper 61 from moving in the radial direction.

[0043] Furthermore, when a narrow paper roll 62 is used, as shown in Figure 7B, the support plate 36 prevents the paper roll 62 from moving in the width direction. The first flapper 20 and the second flapper 30 also prevent the paper roll 62 from moving in the radial direction.

[0044] The remaining amount of roll paper 61, 62 is detected by photosensor 40 regardless of whether the width of the roll paper is changed. In this way, the remaining amount can be detected by the same photosensor 40 in a fixed position regardless of whether the width of the roll paper is changed, so the remaining amount of roll paper can be detected stably and accurately.

[0045] (Upper cover opening and closing structure) The opening and closing mechanism of the upper cover 12 will be described using Figures 8A, 8B, and 8C. Figure 8A is a first diagram illustrating the opening and closing mechanism of the upper cover. Figure 8B is a second diagram illustrating the opening and closing mechanism of the upper cover. Figure 8C is a third diagram illustrating the opening and closing mechanism of the upper cover.

[0046] 8A shows an example of a state in which the upper cover 12 is closed. A torsion spring 25 is installed around the first rotation shaft 21 at the base of the first flapper 20. The torsion spring 25 is prevented from moving around the first rotation shaft 21 by a spring holder 24, and urges the first flapper 20 in the negative direction of the Z axis, i.e., clockwise in FIG. 8A. The spring holder 24 is fixed in a state sandwiched between the upper cover 12 and the lower housing 11.

[0047] The end of the second flapper 30 on the second rotation shaft 31 side abuts against a rib 35 formed on the back surface of the upper cover 12. The upper cover 12 opens and closes around an axis (not shown) along the X axis, which is different from the second rotation shaft 31. The rib 35 is an example of a protrusion in the present disclosure.

[0048] 8B shows an example of a state in which the upper cover 12 is opened approximately 40°. When the upper cover 12 is opened, the end of the second flapper 30 on the second rotation shaft 31 side is pressed by the rib 35, and the second flapper 30 moves together with the upper cover 12.

[0049] Furthermore, when the upper cover 12 is opened, the spring holder 24 is released from its fixed position. Accordingly, the biasing force of the first flapper 20 is released. Therefore, the first flapper 20 is drawn to the upper cover 12 together with the second flapper 30.

[0050] 8C shows an example of the state in which the upper cover 12 is opened approximately 90 degrees. The first flapper 20 and the second flapper 30 are lifted upward along with the upper cover 12. This exposes the storage compartment 18 in the lower housing 11, making it easy to replace the paper roll 51.

[0051] On the other hand, when closing the opened top cover 12 after replacing the paper roll 51, the reverse of the above-described steps is performed. That is, the top cover 12 is closed in the order of Figures 8C, 8B, and 8A. When the top cover 12 is completely closed, the spring holder 24 is fixed in a sandwiched state between the top cover 12 and the lower housing 11. This causes the torsion spring 25 to bias the first flapper 20 in the direction of contact with the paper roll 51.

[0052] (Effects of the embodiment) As described above, the thermal printer 10 (printer device) of this embodiment has an openable upper cover 12 (main body cover) and a lower housing 11. The upper cover 12 is opened to insert roll paper 51. The thermal printer 10 is equipped with a first flapper 20, one end of which is rotatably mounted around a first rotation shaft 21 inside the upper cover 12 (main body cover) while being biased away from the upper cover 12, and the other end of which abuts against the outer surface of the roll paper 51; a second flapper 30, one end of which is rotatably mounted around a second rotation shaft 31 attached to the lower housing 11 and parallel to the first rotation shaft 21, and the other end of which is mounted in the center of the first flapper 20 so as to be able to slide relative to the first flapper 20 depending on the angle of the first flapper 20; and a photosensor 40 (remaining amount detection unit) that detects the remaining amount of roll paper 51 based on the angle of the second flapper 30. Therefore, the photosensor 40 can be installed in a position that is not dependent on the width of the roll paper 51, and the remaining amount of paper can be accurately detected regardless of the width of the roll paper 51.

[0053] Furthermore, in the thermal printer 10 (printer device) of this embodiment, the photosensor 40 (remaining paper amount detection unit) is installed in the lower housing 11. Therefore, the photosensor 40 can be installed in a position that is not dependent on the width of the roll paper 51, and the remaining paper amount can be accurately detected regardless of the width of the roll paper 51.

[0054] In the thermal printer 10 (printer device) of this embodiment, the photosensor 40 (remaining amount detection unit) is a reflective or transmissive photosensor 40 that is installed facing an area whose position changes depending on the attitude of the second flapper 30, such as the protrusion 33. Therefore, the remaining amount of roll paper 51 can be detected accurately with a simple configuration.

[0055] Furthermore, in the thermal printer 10 (printer device) of this embodiment, when the upper cover 12 is opened, one end of the second flapper 30 on the side of the upper cover 12 (the main body is a bar) is pressed by a protrusion (rib) provided on the inside of the upper cover 12, causing it to move along with the inside of the upper cover 12, and when the upper cover 12 is opened, the biasing force on the first flapper 20 is released, causing it to move along with the second flapper 30 in a direction in which it is attracted to the upper cover 12. In this way, when the upper cover 12 is opened, the first flapper 20 and the second flapper 30 are housed in the upper cover 12. This allows the roll paper 51 to be replaced quickly.

[0056] Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. This embodiment and its modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents set forth in the claims. [Explanation of symbols]

[0057] 10 Thermal printer (printer device) 11 Lower housing 12 Top cover 13 Paper output slot 16 Platen roller 17 Thermal head 18 Storage section 19 Stepping motor 20 First Flapper 21 First rotation axis 22 Connecting part 23 Connection hole 24 Spring holder 25 Torsion spring 28 Bearings 30 The Second Flapper 31 Second rotation axis 32 Connecting member 33 Protrusion 35 Rib (protrusion) 36 Support plate 40 Photo sensor (remaining amount detection section) 42 Light-emitting part 43 Light receiving part 50 Thermal Paper 51, 61, 62 Roll paper 52 Roll core 60 light [Prior art documents] [Patent documents]

[0058] [Patent Document 1] Japanese Patent Application Publication No. 2018-8823

Claims

1. A printer device having an openable main body cover and a lower housing, in which roll paper is inserted by opening the main body cover, a first flapper, one end of which is rotatably mounted around a first pivot shaft while being biased toward the inside of the main body cover in a direction away from the main body cover, and the other end of which abuts against the outer circumferential surface of the roll paper; a second flapper, one end of which is rotatably installed around a second rotation axis that is installed on the lower housing and is parallel to the first rotation axis, and the other end of which is installed at the center of the first flapper so as to be slidable with the first flapper according to the angle of the first flapper; a remaining amount detection unit that detects the remaining amount of the roll paper based on the angle of the second flapper; A printer device comprising:

2. the remaining amount detection unit is installed in the lower housing; The printer device according to claim 1 .

3. the remaining amount detection unit is a reflective or transmissive photosensor that is installed facing an area whose position changes depending on the attitude of the second flapper, 3. The printer device according to claim 1.

4. When the main body cover is opened, one end of the second flapper on the side of the main body cover is pushed by a protrusion provided on the inside of the main body cover, and moves along with the inside of the main body cover, When the main body cover is opened, the biasing force of the first flapper is released, and the first flapper moves together with the second flapper in a direction in which the first flapper is attracted to the main body cover.

3. The printer device according to claim 1.

Images