JP7505626B2 - Printing device - Google Patents

Description

The present invention relates to a media loading device.

Patent Document 1 describes, as an example of a medium loading device, a stacker on which media discharged from a fluid ejection device is loaded. This stacker is configured to be foldable when not in use. In other words, the size of the stacker can be reduced when not in use.

JP 2011-32045 A

The stacker described in Patent Document 1 has a fixed size when in use. Therefore, depending on the size of the media being ejected, it may not match the size of the stacker. In this case, there is a risk that the media will not be loaded properly.

The media loading device that solves the above problem is a media loading device on which media discharged from the discharge port of a printing device is loaded, and is characterized by having a sheet that receives the media and a take-up shaft that winds up the sheet.

FIG. FIG. FIG. 13 is a front view showing a state in which the third and fourth ends of the sheet are pulled by the first and second adjustment tools. FIG. 13 is a front view of the sheet when the third and fourth ends are not pulled. FIG. 11 is a side view showing a modified example of the medium stacking device.

Below, an embodiment of a printing device and an embodiment of a medium loading device will be described with reference to the drawings. The printing device is, for example, an inkjet printer that prints images such as characters and photographs by ejecting ink, which is an example of a liquid, onto a medium such as paper. The medium loading device receives the medium printed by the printing device.

As shown in FIG. 1, the printing device 11 includes a housing 12. The housing 12 is formed with an outlet 13 through which the printed medium 99 is discharged. In this embodiment, the outlet 13 is formed on the front surface of the housing 12.

The printing device 11 includes a base 14. The base 14 supports a housing 12. In this embodiment, the housing 12 is located above the base 14. In this embodiment, the upper side in the vertical direction is simply referred to as the upper side, and the lower side in the vertical direction is simply referred to as the lower side.

The printing device 11 is installed on an installation surface 91. The installation surface 91 is, for example, a surface that extends horizontally. In this embodiment, the installation surface 91 is the floor surface with which the base 14 comes into contact.
The printing device 11 of this embodiment is configured to be able to set a roll 98 on which a medium 99 is wound. In this embodiment, the roll 98 is set by being accommodated in a predetermined position within the housing 12. The printing device 11 prints on the medium 99 that is unwound from the roll 98.

The printing device 11 includes a transport unit 15 that transports the medium 99. In this embodiment, the transport unit 15 is located inside the housing 12. The transport unit 15 includes, for example, a first roller 16 and a second roller 17. The first roller 16 and the second roller 17 rotate while sandwiching the medium 99, thereby transporting the medium 99. The transport unit 15 transports the medium 99 from the roll body 98 toward the discharge port 13. In other words, the transport unit 15 transports the medium 99 inside the housing 12 from the rear surface of the housing 12 to the front surface of the housing 12.

The printing device 11 includes a printing unit 18 that prints on a medium 99. In this embodiment, the printing unit 18 is located inside the housing 12. The printing unit 18 prints on the medium 99 by ejecting liquid toward the medium 99. The printing unit 18 prints on the medium 99 that is transported by the transport unit 15.

The printing device 11 includes a cutting unit 19 that cuts the medium 99. In this embodiment, the cutting unit 19 is located inside the housing 12. The cutting unit 19 includes, for example, a first rotary blade 21 and a second rotary blade 22. The first rotary blade 21 and the second rotary blade 22 rotate while sandwiching the medium 99, thereby cutting the medium 99. When the long medium 99 continuing from the roll body 98 is cut by the cutting unit 19, it becomes a single sheet of medium 99 separated from the roll body 98.

The medium 99 discharged from the discharge port 13 of the printing device 11 is loaded onto the medium loading device 31. The medium loading device 31 of this embodiment is used in a state where it is attached to the printing device 11.
Therefore, the printing device 11 of the present embodiment includes an attachment portion 24 for attaching the medium loading device 31. The attachment portion 24 is provided, for example, on the housing 12. The attachment portion 24 may also be provided on the base 14.

The medium loading device 31 includes a sheet 32 that receives the medium 99 and a winding shaft 33 that winds up the sheet 32. The medium 99 discharged from the discharge port 13 is loaded onto the sheet 32. The sheet 32 is made of, for example, a woven fabric or a nonwoven fabric. In this embodiment, the sheet 32 is a long piece of cloth that is rectangular in shape.

In this embodiment, the medium 99 is loaded on the sheet 32 with the printed surface facing upward. Therefore, the back surface of the medium 99, which is the surface opposite the printed surface, contacts the sheet 32. Because the printed surface does not contact the sheet 32, the quality of the printed image is less affected by the medium 99 being placed on the sheet 32.

The winding shaft 33 is attached to one end of the sheet 32. Therefore, when the winding shaft 33 rotates, the sheet 32 is wound onto the winding shaft 33. When the winding shaft 33 rotates in the opposite direction to when the sheet 32 is wound onto the winding shaft 33, the sheet 32 is unwound from the winding shaft 33.

The sheet 32 is used in a state where a predetermined amount has been unwound from the winding shaft 33. The size of the medium 99 that the sheet 32 can carry changes depending on the amount of the sheet 32 unwound from the winding shaft 33. Therefore, in this embodiment, the user increases the amount of the sheet 32 unwound when the size of the medium 99 is large, and decreases the amount of the sheet 32 unwound when the size of the medium 99 is small. In this way, the user can change the size of the sheet 32 that receives the medium 99 according to the size of the medium 99. Note that, in this embodiment, the user changes the amount of the sheet 32 unwound, but the amount of the sheet 32 unwound may be changed depending on the size of the medium 99 detected by a separately provided sensor, without relying on the user's operation.

The sheet 32 is wound around the winding shaft 33 into a roll. Therefore, when the media loading device 31 is not in use, the winding shaft 33 winds up the sheet 32, making the media loading device 31 compact.

In this embodiment, the sheet 32 has a first end 34 which is an end portion, and a second end 35 which is an end portion located opposite the first end 34. In this embodiment, the first end 34 and the second end 35 are ends which are short sides of the sheet 32. The first end 34 is attached to the winding shaft 33. The first end 34 is attached to the winding shaft 33 so as to be parallel to the axis of the winding shaft 33.

The second end 35 is attached to the printing device 11. The second end 35 can also be removed from the printing device 11. When the second end 35 is removed from the printing device 11, the media loading device 31 is removed from the printing device 11.

The sheet 32 is wound and unwound by rotating the winding shaft 33. Therefore, by attaching the second end 35, which is located opposite the first end 34 to which the winding shaft 33 is attached, to the printing device 11, it becomes easier to rotate the winding shaft 33. In other words, it is easier to adjust the size of the sheet 32.

The media stacking device 31 of this embodiment includes a mounting shaft 36 attached to the second end 35 .
The second end 35 is attached to the mounting shaft 36 so as to be parallel to the axis of the mounting shaft 36. Therefore, when the sheet 32 is properly wound by the winding shaft 33, when the sheet 32 is properly unwound from the winding shaft 33, etc., the mounting shaft 36 is parallel to the winding shaft 33.
In this embodiment, the mounting shaft 36 has the same length as the winding shaft 33. The lengths of the mounting shaft 36 and the winding shaft 33 are longer than the first end 34 and the second end 35, which are the width of the sheet 32.

In this embodiment, the second end 35 is attached to the printing device 11 by attaching the mounting shaft 36 to the mounting portion 24. That is, the second end 35 is attached to the printing device 11 via the mounting shaft 36. The mounting portion 24 in this embodiment is configured with a hook on which the mounting shaft 36 can be hooked. This makes it easy to attach and detach the medium loading device 31 to the printing device 11.

In this embodiment, the second end 35 is attached to the printing device 11 at a position higher than the installation surface 91 and lower than the discharge port 13. For example, the attachment portion 24 is provided at a position higher than the installation surface 91 and lower than the discharge port 13. Therefore, the medium 99 cut by the cutting portion 19 falls from the discharge port 13 toward the sheet 32.

In this embodiment, the winding shaft 33 from which the sheet 32 has been unwound is placed on the installation surface 91. In this case, the sheet 32 is inclined or curved downward from the second end 35 to the winding shaft 33. Therefore, the medium 99 discharged from the discharge port 13 is loaded onto the sheet 32 so as to slide over the sheet 32. This promotes the discharge of the medium 99. It is possible to reduce the risk that the medium 99 discharged from the discharge port 13 will accumulate near the discharge port 13. The medium loading device 31 of this embodiment is used in a state in which the sheet 32 extends from the printing device 11 toward the front of it.

The medium loading device 31 may include a support section 37 that supports the winding shaft 33 in a rotatable state. The support section 37 supports, for example, both ends of the winding shaft 33. In this embodiment, the support section 37 is placed on the installation surface 91, so that the winding shaft 33 is placed on the installation surface 91.

As shown in FIG. 2, the medium loading device 31 may include an automatic winding mechanism 38 that rotates the winding shaft 33 in a direction to wind up the sheet 32. The automatic winding mechanism 38 is driven by a user's operation. In this embodiment, the automatic winding mechanism 38 is provided on the support portion 37. The automatic winding mechanism 38 may rotate the winding shaft 33 by, for example, electrical power, or may rotate the winding shaft 33 by the power of a power spring.

The sheet 32 of this embodiment has a third end 41 that is an end different from the first end 34 and the second end 35, and a fourth end 42 that is an end located opposite the third end 41. The third end 41 and the fourth end 42 of this embodiment are ends that are the long sides of the sheet 32.

3, the medium loading device 31 may include a first adjustment tool 43 and a second adjustment tool 44 for pulling the sheet 32. The first adjustment tool 43 is attached to the third end 41 and the printing device 11. The second adjustment tool 44 is attached to the fourth end 42 and the printing device 11. The third end 41 is pulled by the printing device 11 via the first adjustment tool 43. The fourth end 42 is pulled by the printing device 11 via the second adjustment tool 44. That is, the first adjustment tool 43 and the second adjustment tool 44 pull the sheet 32 at the third end 41 and the fourth end 42. If the first adjustment tool 43 and the second adjustment tool 44 are made of rubber, for example, the sheet 32 can be pulled more effectively. By pulling the sheet 32 at the third end 41 and the fourth end 42, the slack in the sheet 32 between the third end 41 and the fourth end 42 is reduced.

As shown in FIG. 4, if the center portion between the third end 41 and the fourth end 42 of the sheet 32 is slackened downward, the corner portion at the tip of the medium 99 comes into contact with the sheet 32 when the medium 99 is discharged from the discharge port 13. That is, a large load is likely to be applied only to the corner portion of the medium 99. At this time, if the sheet 32 is largely slack, the load generated only at the corner portion of the medium 99 by contacting the sheet 32 is likely to be large. As a result, the medium 99 may bend. In contrast, by pulling the sheet 32 with the first adjustment tool 43 and the second adjustment tool 44, if the sheet 32 is in a state where the slackness of the sheet 32 is small, the time from when the corner portion of the medium 99 comes into contact with the sheet 32 to when the center portion in the width direction of the medium 99 comes into contact with the sheet 32 is shortened. Therefore, since the period during which a large load is likely to be generated only at the corner portion of the medium 99 is short, the load on the medium 99 generated by contacting the sheet 32 can be reduced.

The first adjustment tool 43 of this embodiment is fixed to the third end 41 of the sheet 32. The second adjustment tool 44 of this embodiment is fixed to the fourth end 42 of the sheet 32.
The printing device 11 of this embodiment includes a first mounting portion 25 for mounting the first adjustment tool 43, and a second mounting portion 26 for mounting the second adjustment tool 44. In this embodiment, the first mounting portion 25 and the second mounting portion 26 are configured with hooks on which the first adjustment tool 43 and the second adjustment tool 44 can be hooked. The first adjustment tool 43 is attached to the first mounting portion 25 by having a portion thereof hooked onto the first mounting portion 25. The second adjustment tool 44 is attached to the second mounting portion 26 by having a portion thereof hooked onto the second mounting portion 26.

The first adjustment tool 43 and the second adjustment tool 44 may be configured to be able to adjust the magnitude of the force pulling the sheet 32 in stages. For example, the first adjustment tool 43 and the second adjustment tool 44 may be configured with a plurality of annular members. The first adjustment tool 43 in this embodiment has a first annular member 46, a second annular member 47, and a third annular member 48. The first annular member 46 is connected to the third end 41 and the second annular member 47. The second annular member 47 is connected to the first annular member 46 and the third annular member 48.

The first adjustment tool 43 is attached to the printing device 11 by hooking any one of the first annular member 46, the second annular member 47, and the third annular member 48 to the first mounting portion 25. The magnitude of the force pulling the sheet 32 changes depending on whether the first annular member 46, the second annular member 47, or the third annular member 48 is hooked to the first mounting portion 25. In the first adjustment tool 43 of this embodiment, when the third annular member 48 is hooked to the first mounting portion 25, the force pulling the sheet 32 is the weakest. When the first annular member 46 is hooked to the first mounting portion 25, the force pulling the sheet 32 is the strongest.

The second adjustment tool 44 in this embodiment has a fourth annular member 51, a fifth annular member 52, and a sixth annular member 53. The fourth annular member 51 is connected to the fourth end 42 and the fifth annular member 52. The fifth annular member 52 is connected to the fourth annular member 51 and the sixth annular member 53.

The second adjustment tool 44 is attached to the printing device 11 by hooking any one of the fourth annular member 51, the fifth annular member 52, and the sixth annular member 53 to the second mounting portion 26. The magnitude of the force pulling the sheet 32 changes depending on which of the fourth annular member 51, the fifth annular member 52, and the sixth annular member 53 is hooked to the second mounting portion 26. In the second adjustment tool 44 of this embodiment, when the sixth annular member 53 is hooked to the second mounting portion 26, the force pulling the sheet 32 is the weakest. When the fourth annular member 51 is hooked to the second mounting portion 26, the force pulling the sheet 32 is the strongest.

Next, the operation and effects of the above embodiment will be described.
(1) By rotating the winding shaft 33, the size of the sheet 32 unwound from the winding shaft 33 can be adjusted. That is, the size of the sheet 32 can be adjusted to match the size of the medium 99. This allows the medium 99 to be appropriately loaded.

(2) The first end 34 is attached to the winding shaft 33, and the second end 35 is attached to the printing device 11. By attaching the second end 35, which is the end opposite to the first end 34 to which the winding shaft 33 is attached, to the printing device 11, it becomes easier to rotate the winding shaft 33. In other words, it becomes easier to adjust the size of the sheet 32.

(3) The second end 35 is attached to the printing device 11 at a position higher than the installation surface 91 on which the printing device 11 is installed and lower than the discharge port 13. When the winding shaft 33 with the sheet 32 unwound is placed on the installation surface 91, the sheet 32 is inclined or curved downward from the second end 35 to the winding shaft 33. Therefore, the medium 99 discharged from the discharge port 13 is received by the sheet 32 as if sliding over it. This promotes the discharge of the medium 99. It is possible to reduce the risk that the medium 99 discharged from the discharge port 13 will accumulate near the discharge port 13.

(4) The first adjustment tool 43 is attached to the third end 41 and the printing device 11, and the second adjustment tool 44 is attached to the fourth end 42 and the printing device 11. In the unrolled sheet 32, the center portion between the third end 41 and the fourth end 42 is likely to sag downward. If the sheet 32 receives the medium 99 in a state in which the center portion is sagging downward, the load on the medium 99 caused by contact with the sheet 32 increases. In this regard, according to the above embodiment, the first adjustment tool 43 and the second adjustment tool 44 pull the sheet 32 against each other, thereby reducing the sagging of the sheet 32. This reduces the load on the medium 99 caused by contact with the sheet 32.

(5) The first adjustment tool 43 and the second adjustment tool 44 are configured to be able to adjust the magnitude of the force pulling the sheet 32 in stages. This allows the force pulling the sheet 32 to be adjusted to an appropriate magnitude depending on the size of the medium 99.

This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.
5, the winding shaft 33 may be attached to the printing device 11. In this modified example, the winding shaft 33 is attached to the attachment portion 24. In this way, when the medium loading device 31 is not in use, the winding shaft 33 can take up the sheet 32, thereby allowing the medium loading device 31 to be held in the printing device 11. This improves usability.

When the medium loading device 31 includes a support portion 37, the support portion 37 is attached to the mounting portion 24, thereby mounting the winding shaft 33 to the printing device 11. Therefore, the mounting portion 24 is configured to be able to hold the support portion 37. The mounting portion 24 may be configured with a bearing that rotatably supports the winding shaft 33.

In this modified example, the winding shaft 33 is attached to the printing device 11 at a position higher than the installation surface 91 and lower than the discharge port 13. For example, the attachment section 24 is provided at a position higher than the installation surface 91 and lower than the discharge port 13. Therefore, the medium 99 cut by the cutting section 19 falls from the discharge port 13 toward the sheet 32.

The first end 34 of the sheet 32 unwound from the winding shaft 33 is placed on the installation surface 91. In the case where the mounting shaft 36 is provided, the mounting shaft 36 is placed on the installation surface 91, so that the first end 34 is placed on the installation surface 91.

When the first end 34 is placed on the installation surface 91, the sheet 32 is inclined or curved downward from the winding shaft 33 to the first end 34. Therefore, the medium 99 discharged from the discharge port 13 is loaded onto the sheet 32 so as to slide over the sheet 32. This promotes the discharge of the medium 99. It is possible to reduce the risk that the medium 99 discharged from the discharge port 13 will accumulate near the discharge port 13.

According to the above modification, the following effects can be obtained.
(6) The first end 34 is attached to the winding shaft 33, and the winding shaft 33 is attached to the printing device 11. In this way, when the medium loading device 31 is not in use, the winding shaft 33 can wind up the sheet 32, thereby allowing the medium loading device 31 to be held in the printing device 11. This improves usability.

(7) The winding shaft 33 is attached to the printing device 11 at a position higher than the installation surface 91 on which the printing device 11 is installed and lower than the discharge port 13. When the second end 35 of the sheet 32 unwound from the winding shaft 33 is placed on the installation surface 91, the sheet 32 assumes a posture that is inclined or curved downward from the winding shaft 33 to the second end 35. Therefore, the medium 99 discharged from the discharge port 13 is loaded onto the sheet 32 so as to slide over the sheet 32. This promotes the discharge of the medium 99. It is possible to reduce the risk that the medium 99 discharged from the discharge port 13 will accumulate near the discharge port 13.

- As shown in FIG. 5, the first adjustment tool 43 may be detachable from the sheet 32. For example, the first adjustment tool 43 may have an attachment member 55 that is detachable from the third end 41. The attachment member 55 is connected to the first annular member 46. The attachment member 55 is, for example, configured with a clip. The second adjustment tool 44 may also be detachable from the sheet 32. In this case, the second adjustment tool 44 has an attachment member 55 like the first adjustment tool 43. In this way, the positions of the first adjustment tool 43 and the second adjustment tool 44 relative to the sheet 32 can be changed, so that the magnitude of the force pulling the sheet 32 can be changed more finely.

The first adjustment tool 43 may have two annular members, or may have four or more annular members.
The second adjustment tool 44 may have two annular members, or may have four or more annular members.

In the seat 32 , instead of the mounting shaft 36 , an annular member may be provided at the second end 35 .
In this case, the second end 35 is attached to the printing device 11 by hooking the annular member onto the mounting portion 24 .

The first adjustment tool 43 may be made of a string. In this case, the first adjustment tool 43 is attached to the first attachment part 25 by tying the string to the first attachment part 25. The magnitude of the pulling force can be adjusted by changing the tying position of the string relative to the first attachment part 25. The second adjustment tool 44 may also be made of a string like the first adjustment tool 43.

Instead of the roll 98 , a single sheet of media 99 may be set in the printing device 11 .
The printing unit 18 is not limited to an inkjet type. The printing unit 18 may be a toner jet type, a thermal print type, a dot impact type, or the like.

The liquid ejected by the printing unit 18 is not limited to ink, and may be, for example, a liquid in which particles of a functional material are dispersed or mixed in a liquid. For example, the printing unit 18 may eject a liquid that contains, in a dispersed or dissolved form, a material such as an electrode material or a pixel material used in the manufacture of liquid crystal displays, electroluminescent displays, and surface-emitting displays.

The technical ideas and effects obtained from the above-described embodiment and modified examples will be described below.
(A) The medium loading device is a medium loading device on which media is loaded to be discharged from an outlet of a printing device, and is equipped with a sheet that receives the media and a take-up shaft that winds up the sheet.

With this configuration, the size of the sheet unwound from the winding shaft can be adjusted by rotating the winding shaft. In other words, the size of the sheet can be adjusted to match the size of the medium. This allows the medium to be loaded appropriately.

(B) In the above-mentioned media loading device, the sheet may have a first end which is an end portion and a second end which is an end portion located opposite the first end, the first end being attached to the winding shaft, and the second end being attached to the printing device.

The sheet is wound up and unwound by rotating the winding shaft. With the above configuration, the second end, which is the end opposite the first end where the winding shaft is attached, is attached to the printing device, making it easier to rotate the winding shaft. In other words, it becomes easier to adjust the size of the sheet.

(C) In the above medium loading device, the second end may be attached to the printing device at a position higher than an installation surface on which the printing device is installed and lower than the discharge port.
According to this configuration, when the winding shaft from which the sheet has been unwound is placed on the installation surface, the sheet is inclined or curved downward from the second end to the winding shaft. Therefore, the medium discharged from the discharge port is received by the sheet as if sliding on the sheet. This promotes the discharge of the medium. It is possible to reduce the risk that the medium discharged from the discharge port will accumulate near the discharge port.

(D) In the above printing device, the sheet has a first end and a second end opposite the first end, the first end is attached to the winding shaft, and the winding shaft may be attached to the printing device.

With this configuration, when the media loading device is not in use, the take-up shaft can take up the sheet, allowing the media loading device to be held in the printing device. This improves usability.

(E) In the above printing device, the take-up shaft may be attached to the printing device at a position higher than an installation surface on which the printing device is installed and lower than the discharge port.
According to this configuration, when the second end of the sheet unwound from the winding shaft is placed on the installation surface, the sheet is inclined or curved downward from the winding shaft to the second end. Therefore, the medium discharged from the discharge port is stacked on the sheet so as to slide on the sheet. This promotes the discharge of the medium. It is possible to reduce the risk that the medium discharged from the discharge port will accumulate near the discharge port.

(F) The printing device may include a first adjustment tool and a second adjustment tool for pulling the sheet, the sheet may have a third end that is an end different from the first end and the second end, and a fourth end that is an end located opposite the third end, the first adjustment tool may be attached to the third end and the printing device, and the second adjustment tool may be attached to the fourth end and the printing device.

When the sheet is unwound, the central portion between the third end and the fourth end tends to sag downward. If the sheet receives a medium in a state where the central portion is sagging downward, the load on the medium caused by contact with the sheet increases. In this regard, with the above configuration, the first and second adjustment tools pull on the sheet, thereby reducing the sagging of the sheet. This reduces the load on the medium caused by the medium coming into contact with the sheet.

(G) In the printing device described above, the first adjustment tool and the second adjustment tool may be configured to be able to adjust in stages the magnitude of the force pulling the sheet.
According to this configuration, the force with which the sheet is pulled can be adjusted to an appropriate value depending on the size of the medium.

11...printing device, 12...housing, 13...discharge port, 14...base, 15...transport section, 16...first roller, 17...second roller, 18...printing section, 19...cutting section, 21...first rotary blade, 22...second rotary blade, 24...mounting section, 25...first mounting section, 26...second mounting section, 31...media loading device, 32...sheet, 33...winding shaft, 34...first end, 35...second end, 36...mounting shaft, 37...support, 38...automatic winding mechanism, 41...third end, 42...fourth end, 43...first adjustment tool, 44...second adjustment tool, 46...first annular member, 47...second annular member, 48...third annular member, 51...fourth annular member, 52...fifth annular member, 53...sixth annular member, 55...mounting member, 91...installation surface, 98...roll body, 99...medium.

Claims (7)

a housing having an outlet through which the medium is discharged;
a printing unit located within the housing and configured to print on the medium;
a base that supports the housing located above and is in contact with an installation surface;
a sheet for stacking the medium discharged from the discharge port;
Equipped with
A printing device characterized in that the sheet has one end which is an end portion and the other end which is an end portion located opposite the one end, the one end is attached at a position higher than the installation surface and lower than the discharge outlet so that the sheet can receive the medium, and the other end is placed on the installation surface. 2. The printing device according to claim 1, further comprising: a winding shaft attached to one end or the other end of the sheet; and a mounting shaft attached to an end located opposite to the end to which the winding shaft is attached. The printing apparatus according to claim 2 , wherein the take-up shaft is placed on the installation surface, and the mounting shaft is attached to the housing or the base. 4. The printing device according to claim 3, further comprising a support portion that rotatably supports the winding shaft, the support portion being placed on the installation surface so that the winding shaft is placed on the installation surface. The printing apparatus according to claim 2 , wherein the mounting shaft is placed on the installation surface, and the winding shaft is attached to the housing or the base. The printing device according to claim 2 , wherein the take-up shaft rotates to wind and unwind the sheet, and the size of the medium on which the sheet can be stacked is changeable depending on the amount of the sheet unwound. 7. The printing apparatus according to claim 6, further comprising a winding mechanism for rotating the winding shaft by power to wind up the sheet.