Printer and sheet support device

Abstract

A printer and a sheet support device capable of achieving a further space-saving or downsizing structure in a printer. The printer includes a holding portion that holds a wound tape-shaped sheet, a printing portion that prints the sheet pulled out from the holding portion, a frame that houses the holding portion and the printing portion, a pair of support shafts that are supported on the frame, are inserted into an inner periphery of an ink ribbon wound in a cylindrical shape, and support the ink ribbon wound around the printing portion, a driven shaft that is movably coupled to one end of the support shaft in a length direction of the support shaft, an urging member that applies a force to the driven shaft in a direction in which the driven shaft is separated from the support shaft, and a transmission portion that is provided on the frame and is rotationally driven to transmit rotation to the driven shaft that is urged by the force applied by the urging member.

Description

[0001] This application claims priority to Japanese application No. JP2023-051319, filed on March 28, 2023, and incorporates the contents of the aforementioned application in their entirety. Technical Field

[0002] Embodiments of the present invention relate to printers and sheet support devices. Background Technology

[0003] Traditionally, printers that use ink ribbons have a pair of support shafts that support the ink ribbon. The support shafts are inserted into the inner circumference of the cylindrical ink ribbon being wound, and are at least partially in contact with the inner circumference. Thus, the ink ribbon is fed out and wound back, or wound back, by rotational drive via the support shafts.

[0004] In printers, the desire is to further save space or reduce size. To achieve this, the configuration and structure of the various built-in components need to be reconsidered.

[0005] Furthermore, ink ribbons are sold in wound form, and the inner diameter (inner diameter) varies depending on the manufacturer and other factors. Therefore, it is desirable for the support shaft, which needs to be in close contact with the inner circumference, to be compatible with multiple sizes.

[0006] However, depending on the specifications, the inner diameter can sometimes vary greatly. In such cases, the traditional support shaft, which could be adjusted to slightly increase or decrease the corresponding diameter, may not be compatible. Summary of the Invention

[0007] In view of the above problems, the present invention aims to provide a structure that enables further space-saving or miniaturization in printers. Another issue addressed by the present invention is to provide a sheet support device capable of supporting sheets (such as ink ribbons) sold in a wound state with inner diameters varying according to specifications.

[0008] To address the aforementioned problems, in one embodiment, the printer includes: a holding section for holding a wound strip of paper; a printing section for printing on paper pulled out from the holding section; a frame housing the holding section and the printing section; a pair of support shafts; a driven shaft; a force-applying member; and a transmission section. The pair of support shafts are supported on the frame and inserted into the inner circumference of a cylindrical ink ribbon, supporting the ink ribbon wound around the printing section. The driven shaft is movably connected to one end of the support shaft along its length. The force-applying member applies a force to the driven shaft in a direction that causes it to move away from the support shaft. The transmission section is disposed on the frame and is rotatably driven to transmit rotation to the driven shaft, which is pushed by the force applied by the force-applying member.

[0009] According to the printer described above, the structure for pressing the transmission part and the driven shaft together is housed on the support shaft, thus saving space in the printer.

[0010] The printer described above also includes an accessory that is detachable from the support shaft, is longer along the length of the support shaft, and covers the outer periphery of the support shaft.

[0011] The printer described above can be made compatible with accessories to accommodate different inner diameters depending on the specifications of the ink ribbon, thus reducing the cost of the printer.

[0012] In the printer described above, the support shaft has a crimping member that presses against the inner circumference of the ink tape, and the accessory has a curved shape with a generally U-shaped cross section intersecting the length direction, covering the support shaft from the side without the crimping member.

[0013] The printer described above allows for easy loading and unloading of accessories.

[0014] In the printer described above, the accessory has a crimping member on the outer periphery of the curved portion that crimps against the inner periphery of the ink ribbon.

[0015] Based on the printer described above, the attachment can be crimped onto the inner circumference of the ink ribbon.

[0016] In the printer described above, the frame has an upper housing and a lower housing, and the support shaft is supported on the upper housing.

[0017] According to the printer described above, the ink tape can be supported by the upper housing.

[0018] The printer described above has a disc-shaped rotary knob integrally formed with the support shaft, and the outer circumference of the rotary knob is larger than the outer circumference of the accessory.

[0019] According to the printer described above, even with the accessories installed, manual operation to rotate the support shaft is still possible.

[0020] In the printer described above, the transmission part is a disc-shaped component with a central portion that is recessed compared to the edge portion, and has multiple protrusions on the inner side of the recess. The driven shaft is provided with an engagement shape that engages with the protrusions.

[0021] Based on the printer described above, the connection design between the drive unit and the driven shaft is easy.

[0022] In the printer described above, for the accessory and the support shaft, the mounting part provided on one side of the accessory is hooked onto the mounting hole provided on one side of the support shaft in a hooking direction along the axial direction of the support shaft, and the mounting part provided on the other side of the accessory is hooked onto the engaging part provided on the other side of the support shaft in a hooking direction orthogonal to the axial direction of the support shaft.

[0023] According to the printer described above, by using two hook structures with different directions of action to install the accessories on the support shaft, the accessories can be easily installed and removed and are less likely to fall off due to the rotation of the support shaft.

[0024] Another aspect of the sheet support device of the present invention comprises: a support shaft inserted into the inner periphery of a strip sheet wound into a cylindrical shape to support the sheet; and an accessory that is detachable from the support shaft, extends along the length of the support shaft, and covers the outer periphery of the support shaft.

[0025] The sheet support device described above can be used to address the large differences in inner diameter depending on the specifications of the ink ribbon by using an accessory, thereby reducing the cost of the printer.

[0026] In the sheet support device described above, the support shaft has a pressing member that presses against the inner periphery of the sheet, and the attachment has a generally U-shaped shape in a cross section intersecting the length direction, covering the support shaft from the side without the pressing member.

[0027] The aforementioned sheet support device allows for easy loading and unloading of accessories. Attached Figure Description

[0028] Figure 1 This is a perspective view showing an example of the appearance of the printer in the embodiment.

[0029] Figure 2 This is a perspective view showing an example of the printer being turned on in an embodiment.

[0030] Figure 3 This is a schematic diagram illustrating an example of the structure of a printer as viewed from the side of an embodiment.

[0031] Figure 4 This is a schematic diagram showing the installation state of the upper housing of the support shaft as viewed from the front.

[0032] Figure 5 It is a three-dimensional view showing the appearance of the transmission section.

[0033] Figure 6 It is a three-dimensional view showing the appearance of the support shaft.

[0034] Figure 7This is a three-dimensional diagram showing the connection structure between the transmission part and the support shaft in cross-section.

[0035] Figure 8 This is a perspective view showing the mounting structure of the accessory being installed on the support shaft.

[0036] Figure 9 This is a schematic diagram showing the appearance of the support shaft with the accessory installed, and the hook structure on section AA where the accessory is hooked to the rotary knob.

[0037] Figure 10 This is a schematic diagram showing the appearance of a support shaft with accessories installed.

[0038] Explanation of reference numerals in the attached figures

[0039] 1…Printer, 2…Frame, 20…Hinge, 21…Upper housing, 22…Lower housing, 23…Front cover, 25, 26…Support, 3…Display and operation unit, 4…Open / close button, 5…Paper outlet, 6…Paper holding unit (an example of a holding unit), 60…Roll paper, 61…Paper, 7…Printing unit, 71…Print head, 72…Pressure roller, 80…Belt roller, 801…Ribbon (an example of sheet material), 8…Belt support unit (an example of a sheet support device), 81, 82…Support shaft, 811…Guide groove, 8 12…guide groove, 813…engaging part, 83…end, 84…driven shaft, 841…meshing shape, 85…slider, 86…anti-rotation part, 87…force-applying part, 88…pressing part, 89…rotary knob, 891…mounting hole, 91…transmission part, 911…protrusion, 912…groove, 913…sloping surface, 92…rotating shaft, 21…front end, 922…pin, 95, 96…gear, 100…accessory, 101…mounting part, 102…flange part, 103…mounting part, 105…rib. Detailed Implementation

[0040] The embodiments are described using the accompanying drawings. Figure 1 This is a perspective view showing an example of the appearance of the printer 1 according to the embodiment. The printer 1 has a frame 2, a display operation unit 3, an open / close button 4, and a paper feed port 5. The side where the paper feed port 5 is located is the front side of the printer 1, and the side opposite to the side where the paper feed port 5 is located is the back side.

[0041] The frame 2 is a box-shaped container with an upper shell 21 and a lower shell 22. The upper shell 21 has a downward opening, and the lower shell 22 has an upward opening. The rear side edge of the upper shell 21 is rotatably mounted to the lower shell 22 via a hinge 20. Thus, the upper shell 21 and the lower shell 22 are rotatably connected, and their openings open and close with rotation.

[0042] The hinge 20 connects the upper housing 21 and the lower housing 22 rotatably on the rear side. The hinge 20 has a force-applying component such as a torsion spring on the width side of the lower housing 22. The force-applying component applies force to the upper housing 21 in the direction that opens the lower housing 22, thereby making the action of closing the lower housing 22 by the upper housing 21 smooth.

[0043] The display operation unit 3 is located on the top of the upper housing 21. The display operation unit 3 accepts various operation inputs and displays various information. The open / close button 4 is located on the side of the upper housing 21 near the front. When the open / close button 4 is pressed, the locked state of the structure holding the upper housing 21 in the closed position of the lower housing 22 is released, the upper housing 21 is lifted by the force applied by the force-applying component, and the frame 2 is opened.

[0044] A portion of the front (front) side of the lower housing 22 is formed by a front cover 23. The front cover 23 is an example of a cover portion. In addition, the other parts of the frame 2, excluding the front cover 23, are examples of the main body portion.

[0045] Paper discharge port 5 is an opening for issuing (discharging) printed materials such as tickets (printed paper 61), and is located between the upper end of the front cover 23 and the lower front end of the upper housing 21.

[0046] Figure 2 This is a perspective view showing an example of the printer 1 in the embodiment being turned on. Figure 3 This is a schematic diagram illustrating an example of the structure of the printer 1 of the embodiment as viewed from the side. A paper holding section 6, a printing section 7, and a tape support section 8 are provided within the frame 2. The paper holding section 6 holds the roll of paper 60 wound with the tape 61 in a rotatable manner.

[0047] As a roll of paper 60, there are, for example, ticket rolls and label rolls. A ticket roll is made by winding a strip of ticket paper (an example of paper 61). The ticket paper is a strip of paper 61 that is printed and cut into tickets.

[0048] The label roll is made by winding a strip of label paper (an example of paper 61). As label paper, there are labels with backing paper (labels pasted onto a strip of backing paper) and strip labels without backing paper. It should be noted that the label has an adhesive layer on the back of the printed side.

[0049] The printing unit 7 prints on the paper 61 while feeding the paper 61 pulled out from the paper holding unit 6, and includes a print head 71 and a pressure roller 72. The print head 71 is fixed to the inner side of the upper housing 21 and is in close contact with the pressure roller 72 when the upper housing 21 closes the opening on the upper surface of the lower housing 22.

[0050] The printhead 71 is, for example, a thermal printhead, having multiple heating elements arranged in parallel. The printhead 71 uses the heat from the heating elements to print on the paper 61 sandwiched between itself and the pressure roller 72. The pressure roller 72 rotates by a stepper motor, conveying the paper 61 sandwiched between itself and the printhead 71.

[0051] Printer 1 prints using ink transferred from the surface of a thermal transfer ribbon 801. The ribbon 801 is an example of a strip-shaped sheet, supported by a ribbon support 8 in a wound state. The ribbon support 8 is an example of a sheet support device, having support shafts 81 and 82. Support shaft 81 supports unused wound ink ribbon 801 and supplies or rewinds the ink ribbon 801 by rotation. Support shaft 82 winds used ink ribbon 801 and winds or rewinds the ink ribbon 801 by rotation.

[0052] The two ends of the support shaft 81 and support shaft 82 are supported on the inner wall of the upper housing 21 and rotate by transmitting driving force to one end.

[0053] Figure 4 This is a schematic diagram showing the installation state of the support shaft 81 mounted on the upper housing 21, viewed from the front. It should be noted that the installation state of the support shaft 82 is the same as that of the support shaft 81. The following description of the support shaft 81 also applies to the support shaft 82.

[0054] The upper housing 21 has support portions 25 and 26 on a pair of sidewalls forming the inner wall. The support portion 25 is a through hole into which one end 83 of the support shaft 81 is inserted. The end 83 is formed to be thinner than the central portion of the ribbon 801 (roller 80) that supports the support shaft 81. By inserting the end 83 into the support portion 25, the support shaft 81 is rotatably supported on the upper housing 21.

[0055] The support portion 26 is a through hole that rotatably supports the rotating shaft 92 of the transmission portion 91. A gear 95 is connected to the rotating shaft 92, and the driving force of the motor or the like in the lower housing 22 is transmitted to the gear 95 via other gears 96, etc. As a result, the transmission portion 91 is driven to rotate.

[0056] Figure 5 This is a perspective view showing the appearance of the transmission section 91. The transmission section 91 is a disc-shaped component with a central portion recessed from the edges, and has multiple protrusions 911 on the inner side of the recess. The front end portion 921 of the rotating shaft 92 is inserted into the center of the transmission section 91. A pin 922, inserted approximately orthogonally to the front end portion 921, is embedded in a groove 912 in the center of the transmission section 91, serving as an anti-rotation part for both the rotating shaft 92 and the transmission section 91.

[0057] Multiple protrusions 911 are arranged along the edge of the transmission section 91 with gaps between them. These protrusions 911 have inclined surfaces 913, 914 that are inclined relative to the protrusion direction, and engage with the driven shaft 84 (described later) of the support shaft 81 in a meshing shape 841. Through this meshing, the driving force of the motor, etc., is transmitted to the support shaft 81, and the support shaft 81 rotates.

[0058] Figure 6 This is a perspective view showing the appearance of the support shaft 81. Figure 7 This is a perspective view showing the connection structure between the transmission part 91 and the support shaft 81 in cross section. The support shaft 81 has a driven shaft 84, a slider 85, an anti-rotation part 86, a force-applying part 87, a pressing part 88, and a rotary knob 89 at the end opposite to the aforementioned end 83.

[0059] Driven shaft 84 is provided at the front end of support shaft 81. Engaging shape 841 is provided at the front end of driven shaft 84. Engaging shape 841 is, for example, a concave-convex shape that engages with protrusion 911. When transmission part 91 rotates while protrusion 911 is engaged with engagement shape 841, rotation is transmitted to driven shaft 84, and support shaft 81 rotates.

[0060] The slider 85 is freely movable along its length within a guide groove 811 disposed inside the support shaft 81. The guide groove 811 is provided relatively long along the axial direction of the support shaft 81. The slider 85 is integrally disposed with the driven shaft 84. Thus, the driven shaft 84 is also freely movable along the length direction of the guide groove 811. That is to say, the driven shaft 84 is freely movable within a predetermined range along the axial direction of the support shaft 81.

[0061] An anti-rotation part 86 is inserted into the driven shaft 84, and is substantially orthogonal to the axial direction of the driven shaft 84. A guide groove 812, which is longer in its axial direction and communicates with a guide groove 811, is formed on the support shaft 81. The end of the anti-rotation part 86 is embedded in the guide groove 812. The anti-rotation part 86 can move along the guide groove 812. As a result, the driven shaft 84 can move along the axial direction of the support shaft 81 without rotating about the support shaft 81.

[0062] The force-applying component 87 is, for example, a compression spring disposed between the ends of the support shaft 81 and the driven shaft 84. The force-applying component 87 applies a force to the driven shaft 84 in a direction away from the support shaft 81. As a result, when mounted on the upper housing 21, the driven shaft 84 is pressed against the transmission part 91. In this state, the engagement shape 841 of the driven shaft 84 engages with the protrusion 911 of the transmission part 91, and the rotation of the transmission part 91 is transmitted to the driven shaft 84.

[0063] The crimping member 88 is, for example, a leaf spring disposed on the circumferential surface of the support shaft 81. The crimping member 88 presses (crimps) the inner circumference of the belt roller 80 when the support shaft 81 is inserted into the inner circumference of the wound ribbon 801 (belt roller 80). As a result, the ribbon roll 80 with the support shaft 81 inserted rotates integrally with the support shaft 81.

[0064] The rotary knob 89, located between the support shaft 81 and the driven shaft 84, is a disc-shaped part integrally formed with the support shaft 81. The rotary knob 89 has an embossed shape on its outer circumferential surface, allowing for manual operation to rotate the support shaft 81. The rotary knob 89 is used, for example, when changing the ribbon 8001, or when adjusting the tension of the ribbon 801 pulled from the ribbon roller 80 mounted on the ribbon support 8 and wound around the print head 71. The outer circumference of the rotary knob 89 is larger than the outer circumference of the accessory 100 described later. Even with the accessory installed, manual operation is still possible.

[0065] Here, Figure 7 The support shaft 81 shown is in the state with the accessory 100 described below installed. Figure 8 This is a perspective view showing the installation structure of Attachment 100 mounted on Support Shaft 81. Figure 9 This is a schematic diagram showing the appearance of the support shaft 81 with accessory 100 installed, and the hook structure on section AA where accessory 100 is hooked to the rotary knob 89. Figure 10 This is a schematic diagram showing the appearance of the support shaft 81 with accessory 100 installed, from the perspective of... Figure 9 The state observed from the opposite side.

[0066] The accessory 100 has a curved shape that is longer along the length of the support shaft 81 and has a roughly U-shaped cross-section in the thickness direction of the support shaft 81, and is mounted on the support shaft 81 in such a way as to cover the outer periphery of the support shaft 81. The accessory 100 has a mounting portion 101 and a flange portion 102 at one end and a mounting portion 103 at the other end.

[0067] Additionally, the attachment 100 has a crimping member 108 at the position corresponding to the aforementioned approximately U-shaped bend. The crimping member 108 is the same as the crimping member 88, and it presses against (presses) the inner circumference of the belt roller 80.

[0068] The flange portion 102 is a flange-shaped portion that extends radially from one end of the attachment 100 and contacts the circular surface of the rotary knob 89 when the attachment 100 is mounted on the support shaft 81.

[0069] A mounting hole 891 is provided on the circular surface of the rotary knob 89. The mounting part 101 protrudes from the outer periphery of the flange part 102, is inserted into the mounting hole 891 and is hooked.

[0070] The mounting portion 103 has a shape that protrudes from a pair of U-shaped ends toward each other. On the other hand, a locking portion 813 is provided on the support shaft 81 at a position corresponding to the mounting portion 103 (see reference). Figure 6 and Figure 8 The engaging portion 813 has a hook surface that is substantially orthogonal to the outer surface of the support shaft 81 and an inclined guide surface that connects to the outer surface of the support shaft 81 from the front end of the hook surface, through which the mounting portion 103 is guided to the front end of the hook surface. When the mounting portion 103 passes the front end, the mounting portion 103 engages with the engaging portion 813.

[0071] With the mounting parts 101 and 103 described above, the accessory 100 is hooked onto the support shaft 81, so as to install the support shaft 81 in a state of covering and enveloping the outer periphery of the support shaft 81.

[0072] It should be noted that the side of the annex 100 facing the support shaft 81 is filled with a plurality of U-shaped ribs 105 arranged along the length of the support shaft 81.

[0073] In this structure, the paper 61 pulled out from the paper holding section 6 is printed by the printing section 7 and discharged from the paper discharge port 5. The printing section 7 holds the paper 61 and the ink ribbon 801 overlapping between the print head 71 and the pressure roller 72, and prints with the print head 71 while conveying them by the rotation of the pressure roller 72. The print head 71 melts the ink of the ink ribbon 801 and transfers it onto the paper 61.

[0074] Support shaft 81 supplies (feeds) ink ribbon 801. Support shaft 82 winds the ink ribbon 801 after it has passed through printhead 71. Support shafts 81 and 82 may rotate in opposite directions as needed, and the ink ribbon 801 is transported in the reverse direction.

[0075] The support shaft 81 (and the support shaft 82 as well) transmits the driving force of the motor, etc., via the driven shaft 84 and the transmission part 91, thereby rotating the support shaft 81.

[0076] The driven shaft 84 is pressed against the transmission part 91 by the force applied by the force-applying member 87. In this state, the driven shaft 84 rotates as the transmission part 91 rotates by engaging with the protrusion 911 through the engagement shape 841.

[0077] The motor and other components are housed in the lower housing 22 of the printer 1, and the transmission unit 91 is rotated by gears 95, 96, etc. The structure for pressing the transmission unit 91 and the driven shaft 84 together is housed on the support shaft 81. That is, the slider 85 and guide groove 811, the anti-rotation part 86 and guide groove 812, and the force-applying part 87 are provided on the support shaft 81.

[0078] Therefore, it is unnecessary to have a structure equivalent to these (slider 85, anti-rotation part 86, force-applying part 87, guide groove 811, guide groove 812) on the printer 1 side, thus saving space inside the printer 1 and enabling miniaturization. In addition, a structure (slider 85, anti-rotation part 86, force-applying part 87, guide groove 811, guide groove 812) that was not present in the past is added to the support shaft 81. However, since it is a part inside the support shaft 81 and is a dead zone in the past, it does not increase the space and there is no problem.

[0079] The support shaft 81 is tightly attached to the inner circumference of the cylindrical roller 80, or the accessory 100 mounted on the support shaft 81 is tightly attached to the inner circumference of the cylindrical roller 80. The support shaft 81 is tightly attached to the inner circumference of the roller 80 by a pair of pressing members 88 provided along its length. In addition, the accessory 100 is tightly attached to the inner circumference of the roller 80 by a pair of edges corresponding to the two ends of the U-shape and by pressing members 108 provided at positions corresponding to the bends of the U-shape.

[0080] Attachment 100 is installed at both ends of the support shaft 81 by hook structures with different directions of action during the hooking action.

[0081] One aspect of the hooking structure between accessory 100 and support shaft 81 utilizes a hooking structure between mounting part 101 and mounting hole 891, with the hooking direction approximately along the axial direction of support shaft 81. The other aspect utilizes a hooking structure between mounting part 103 and engaging part 813, with the hooking direction approximately orthogonal to the axial direction of support shaft 81. In other words, for accessory 100 and support shaft 81, the mounting part 101 on one side of the accessory hooks onto the mounting hole 891 on one side of the support shaft 81 in a hooking direction approximately along the axial direction of support shaft 81. Furthermore, the mounting part 103 on the other side of the accessory 100 hooks onto the engaging part 813 on the other side of the support shaft 81 in a hooking direction approximately orthogonal to the axial direction of support shaft 81.

[0082] In this way, by using two hook structures with different directions of action to install the accessory 100 on the support shaft 81, it is easy to install and remove and the accessory 100 is less likely to fall off due to the rotation of the support shaft 81.

[0083] Based on the structure of this embodiment described above, a structure that enables further space-saving or miniaturization in printer 1 can be provided.

[0084] Furthermore, according to this embodiment, by appropriately using the accessory 100, it is possible to accommodate different inner diameters of the belt roller 80 depending on the specifications.

[0085] In the printer 1 of this embodiment, the functions that were previously performed in the lower housing 22 (or upper housing 21) are located on the support shaft 81. This saves space within the frame 2 and reduces the size of the printer 1, but on the other hand, increases the manufacturing cost of the complex support shaft 81. Therefore, if a support shaft 81 with an inner diameter matching the specifications of the belt roller 80 is prepared, the cost increases. However, in this embodiment, the cost is controlled because the inner diameter is different due to the specifications caused by the accessory 100.

[0086] The above describes several embodiments of the present invention, but these embodiments are merely examples and are not intended to limit the scope of the invention. The new embodiments described above can be implemented in various other ways, and various omissions, substitutions, modifications, and combinations can be made without departing from the spirit of the invention. The above embodiments and their variations are included within the scope and spirit of the invention, and also within the scope of the claims and their equivalents.

Claims

1. A printer comprising: The holding section holds the wound strip of paper; A printing unit that prints on paper pulled out from the holding unit; A frame, which houses the retaining part and the printing part; A pair of support shafts, which are supported on the frame, are inserted into the inner circumference of the ink ribbon wound into a cylindrical shape, and support the ink ribbon wrapped around the printing section. The driven shaft is movably connected to one end of the support shaft along the length direction of the support shaft; A force-applying component that applies a force in the direction that causes the driven axis to move away from the support axis; A transmission unit, which is disposed on the frame and is rotatably driven, transmits rotation to the driven shaft that is pushed by the force-applying component. in, The printer also features: The accessory is detachable from the support shaft, extends along the length of the support shaft, and covers the outer periphery of the support shaft; The support shaft includes a pressing member that presses against the inner circumference of the ink tape. The accessory has a generally U-shaped curved shape with a cross-section intersecting the length direction, covering the support shaft from the side without the crimping component.

2. The printer according to claim 1, wherein, The accessory has a crimping member on the outer periphery of the curved portion that crimps against the inner periphery of the ink ribbon.

3. The printer according to claim 2, wherein, The frame has an upper shell and a lower shell. The support shaft is supported on the upper housing.

4. The printer according to claim 3, wherein, It has a disc-shaped rotary knob integrally formed with the support shaft. The outer circumference of the rotary knob is larger than the outer circumference of the accessory.

5. The printer according to claim 4, wherein, The transmission part is a disc-shaped component with a central portion that is recessed compared to the edge portion, and has multiple protrusions on the inner side of the recess. The driven shaft is provided with an engagement shape that engages with the protrusion.

6. The printer according to claim 5, wherein, Regarding the aforementioned accessories and the aforementioned support shaft... The mounting portion provided on one side of the accessory hooks onto the mounting hole provided on one side of the support shaft in the hooking direction along the axial direction of the support shaft. The mounting part located on the other side of the accessory is hooked and mounted on the engaging part located on the other side of the support shaft in a hooking direction orthogonal to the axial direction of the support shaft.

7. A sheet support device, comprising: A support shaft is inserted into the inner circumference of a strip of sheet wound into a cylindrical shape to support the sheet. The accessory, which is detachable from the support shaft, is relatively long along the length of the support shaft, and covers the outer periphery of the support shaft. in, The support shaft has a pressing member that presses against the inner periphery of the sheet. The accessory has a generally U-shaped cross section intersecting the length direction, covering the support shaft from the side without the crimping component.

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