Medium rewinding mechanism and printer

Abstract

The utility model relates to the technical field of printing, in particular to a medium rewinding mechanism and a printer. The medium rewinding mechanism comprises a core shaft, a winding drum, a first elastic part and a movable part, the core shaft is configured to rotate around the axis of the core shaft, the winding drum is arranged on the core shaft in a sleeving mode, the winding drum is used for winding a medium and comprises a first shell and a second shell which are mutually buckled in the radial direction of the core shaft, and the movable part is arranged in the winding drum and can slide in the axial direction of the core shaft; the movable part is provided with a supporting position and an avoiding position, in the process that the movable part slides from the avoiding position to the supporting position, the movable part drives the first shell and the second shell to move relatively so that the winding drum can be changed from the contraction state to the stretching state, and in the process that the movable part slides from the supporting position to the avoiding position, the winding drum can be stretched. The first elastic piece drives the first shell and the second shell to move relatively so that the winding drum can be changed from the stretching state to the contracting state. According to the medium rewinding mechanism provided by the utility model, the medium can be conveniently detached from the winding drum, and the medium detaching efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of printing, in particular to a medium rewinding mechanism and a printer. Background Art

[0002] The media rewind mechanism of the printer is used to rewind used media (such as carbon ribbon). The existing media rewind mechanism usually puts a roll on the rewind shaft, winds the used media on the roll, and removes the media together with the roll from the rewind shaft and discards it after the media is full. The disadvantage of this method is that the roll used is disposable and cannot be reused, which wastes resources and is inconvenient to use. For this reason, the relevant technology provides another way to wind the media on a reusable roll. After the media is full, the media is directly removed from the roll. However, due to the large clamping force generated when the media is wound on the roll, the media cannot be removed smoothly, which makes it inconvenient to remove the media from the roll and the removal efficiency is low. Utility Model Content

[0003] The purpose of the utility model is to provide a medium rewinding mechanism and a printer, which facilitates the removal of the medium from the roll and improves the efficiency of the medium removal.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A medium rewinding mechanism comprises a core shaft, a reel, a first elastic member and a movable member, wherein the core shaft is configured to rotate around its own axis, the reel is sleeved on the core shaft, and the reel is used to wind the medium, the reel comprises a first shell and a second shell that are mutually buckled along the radial direction of the core shaft, the first shell and the second shell can move relative to each other along the radial direction of the core shaft so that the reel is in an extended state or a contracted state; the first elastic member is used to make the reel always have a tendency to change to the contracted state; the movable member is arranged in the reel and can slide along the axial direction of the core shaft, and the movable member has a support position and The movable member is in the avoidance position, when the movable member is in the supporting position, the reel is in the extended form, and when the movable member is in the avoidance position, the reel is in the contracted form. During the sliding of the movable member from the avoidance position to the supporting position, the movable member drives the first shell and the second shell to move relative to each other so that the reel changes from the contracted form to the extended form. During the sliding of the movable member from the supporting position to the avoidance position, the first elastic member drives the first shell and the second shell to move relative to each other so that the reel changes from the extended form to the contracted form.

[0006] As an optional solution, one of the movable part and the reel includes a supporting portion, and the other of the movable part and the reel includes a matching portion, and the matching portion includes a supporting surface and an avoidance groove. When the movable part is located at the supporting position, the supporting portion abuts against the supporting surface so that the reel is in the extended form; when the movable part is located at the avoidance position, the supporting portion extends into the avoidance groove so that the reel is in the contracted form.

[0007] As an optional scheme, the movable part has a first end and a second end along the radial direction of the core shaft, the first end and the second end both include the support part, the first shell and the second shell are symmetrically arranged about the axis of the core shaft and both include the matching part; in the process of the movable part sliding from the avoidance position to the supporting position, the movable part drives the first shell and the second shell to move oppositely relative to the core shaft along the radial direction of the core shaft at the same time, and when the movable part is located at the supporting position, the support part of the first end abuts against the support surface of the first shell, and the support part of the second end abuts against the support surface of the second shell; in the process of the movable part sliding from the supporting position to the avoidance position, under the action of the first elastic part, the first shell and the second shell move toward each other along the radial direction of the core shaft at the same time relative to the core shaft, and when the movable part is located at the avoidance position, the support part of the first end extends into the avoidance groove of the first shell, and the support part of the second end extends into the avoidance groove of the second shell.

[0008] As an optional solution, the movable part includes a main frame in the shape of a rectangular parallelepiped, the main frame is sleeved with the core shaft, the support part at the first end and the support part at the second end are respectively arranged at the two ends of the main frame along the first direction, the medium rewinding mechanism also includes two limit frames arranged in parallel and spaced apart, the two limit frames are fixedly connected to the core shaft and are respectively located on both sides of the main frame along the second direction, and the distance between the two limit frames is adapted to the size of the main frame along the second direction; the first shell and the second shell both include two limit plates arranged opposite and spaced apart along the second direction, the support part at the first end is located between the two limit plates of the first shell, the support part at the second end is located between the two limit plates of the second shell, and the size of the support part along the second direction is adapted to the distance between the two limit plates, wherein the first direction, the second direction and the axial direction of the core shaft are perpendicular to each other.

[0009] As an optional solution, the mating portion also includes an inclined surface connecting the avoidance groove and the support surface, and the support portion is a roller that can rotate freely around its own axis. In the process of the movable part sliding from the support position to the avoidance position, under the action of the first elastic part, the roller rolls along the support surface and the inclined surface to the avoidance groove in turn.

[0010] As an optional solution, the medium rewinding mechanism also includes a knob, which is connected to the core shaft, the first end of the knob is located outside the roll, and the second end of the knob extends into the roll and is connected to the movable part. When the knob rotates along the set direction around the axis of the core shaft, it can drive the movable part to slide along the axial direction of the core shaft from the support position to the avoidance position.

[0011] As an optional solution, the medium rewinding mechanism also includes a second elastic member, which is configured to enable the movable member to always have a movement tendency to slide toward the supporting position and abut against the second end of the knob; the core shaft is provided with a screw, and the knob is connected to the core shaft through the screw, and the screw is configured to enable the knob to rotate around the axis of the core shaft and slide along the axial direction of the core shaft when subjected to an axial force along the core shaft; when an external force rotates the knob along the set direction, the knob overcomes the elastic force of the second elastic member and slides relative to the core shaft and drives the movable member to slide to the avoidance position, and when the external force is eliminated, the movable member is driven by the second elastic member to return to the supporting position, and the movable member sliding toward the supporting position drives the knob to rotate in the opposite direction of the set direction while sliding synchronously with the movable member along the axial direction of the core shaft.

[0012] As an optional scheme, the movable part includes a cone body coaxially sleeved with the core shaft, and the cone body can slide along the axial direction of the core shaft while rotating around the axis of the core shaft, and the cone body includes a large end and a small end spaced apart along its axial direction, and the outer peripheral surface of the cone body is spaced apart by a first spiral groove and a second spiral groove, both of which extend along the axial direction of the cone body, the first spiral groove has a first plug-in portion and a second plug-in portion, and the second spiral groove has a third plug-in portion and a fourth plug-in portion, and along the direction from the large end to the small end, the first plug-in portion is located upstream of the second plug-in portion, and the third plug-in portion is located upstream of the fourth plug-in portion, the inner wall of the first shell is provided with a first protrusion, and the inner wall of the second shell is provided with a second protrusion, and the first protrusion is aligned with the first protrusion and the second protrusion. A spiral groove is plugged in and the second protrusion is plugged in to the second spiral groove; when the cone rotates, the first protrusion and the second protrusion jointly drive the cone to slide along the axial direction of the core shaft, so that the plug-in position of the first protrusion and the first spiral groove changes between the first plug-in part and the second plug-in part, and the plug-in position of the second protrusion and the second spiral groove changes between the third plug-in part and the fourth plug-in part, wherein, when the movable part is located at the supporting position, the first protrusion is plugged in to the first plug-in part, and the second protrusion is plugged in to the third plug-in part; when the movable part is located at the avoidance position, the first protrusion cooperates with the second plug-in part, and the second protrusion cooperates with the fourth plug-in part.

[0013] As an optional solution, the media rewinding mechanism also includes a knob, which is sleeved on the core shaft, the first end of the knob is located outside the roll, and the second end of the knob extends into the roll and is connected to the cone. When the knob rotates along a set direction around the axis of the core shaft, it can drive the cone to rotate around the axis of the core shaft.

[0014] A printer includes a frame and the above-mentioned medium rewinding mechanism, wherein the medium rewinding mechanism is arranged on the frame and is used to rewind the used carbon ribbon, and one end of the core shaft of the medium rewinding mechanism is supported by the frame and the other end is suspended.

[0015] Beneficial effects of the utility model:

[0016] The utility model provides a medium rewinding mechanism, which includes a core shaft, a reel, a first elastic member and a movable member, wherein the core shaft is configured to rotate around its own axis, the reel is sleeved on the core shaft, and the reel is used to wind the medium, and the reel includes a first shell and a second shell that are mutually interlocked along the radial direction of the core shaft, the first shell and the second shell can move relative to each other along the radial direction of the core shaft, so that the reel is in an extended shape or a contracted shape, the first elastic member is used to make the reel always have a tendency to change to a contracted shape, the movable member is arranged in the reel and can slide along the axial direction of the core shaft, the movable member has a supporting position and an avoidance position, when the movable member is in the supporting position, the reel is in an extended shape, and when the movable member is in the avoidance position, the reel is in a contracted shape, in the process of the movable member sliding from the avoidance position to the supporting position, the movable member drives the first shell and the second shell to move relative to each other so that the reel changes from the contracted shape to the extended shape, and in the process of the movable member sliding from the supporting position to the avoidance position, the first elastic member drives the first shell and the second shell to move relative to each other so that the reel changes from the extended shape to the contracted shape. The above arrangement enables the movable part to be located in the supporting position when the medium rewinding mechanism needs to rewind the medium. At this time, the roll is in an extended form. The roll in the extended form tightly wraps the medium around the outer periphery of the roll as the core shaft rotates, forming a cylindrical shape; when the cylindrical medium needs to be removed from the roll, the movable part slides along the core shaft from the supporting position to the avoidance position, and the roll changes from the extended form to the contracted form under the action of the first elastic part. Since the size of the roll in the contracted form is smaller than the size of the roll in the extended form along the direction of relative movement of the first shell and the second shell, the gap between the inner surface of the cylindrical medium and the outer surface of the roll becomes larger, thereby reducing the clamping force between the cylindrical medium and the roll, making it convenient to remove the medium from the roll and improving the efficiency of medium removal.

[0017] The present invention also provides a printer comprising a frame and the aforementioned media rewind mechanism. The media rewind mechanism is mounted on the frame and is used to rewind a used carbon ribbon. One end of a core shaft of the media rewind mechanism is supported by the frame, while the other end is suspended in the air. The printer provided by the present invention utilizes the aforementioned media rewind mechanism to facilitate removal of media from a roll, thereby improving media removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the medium rewinding mechanism provided in the first embodiment of the present utility model;

[0019] Figure 2 This is a partial structural diagram of the medium rewinding mechanism provided in the first embodiment of the present utility model;

[0020] Figure 3 This is a structural cross-sectional view of the medium rewinding mechanism provided by the first embodiment of the present utility model when the movable member is in the supporting position;

[0021] Figure 4 This is a structural cross-sectional view of the medium rewinding mechanism provided in the first embodiment of the present invention when the movable member is in the avoidance position;

[0022] Figure 5 This is an exploded view of the structure of the medium rewinding mechanism provided in the first embodiment of the present invention;

[0023] Figure 6 This is a structural schematic diagram of the first housing of the medium rewinding mechanism provided in the first embodiment of the present utility model;

[0024] Figure 7 This is a partial structural exploded view of the medium rewinding mechanism provided in the first embodiment of the present utility model;

[0025] Figure 8 This is a structural cross-sectional view of the medium rewinding mechanism provided by the second embodiment of the present utility model when the movable member is in the supporting position;

[0026] Figure 9 This is a structural cross-sectional view of the medium rewinding mechanism provided by the second embodiment of the present invention when the movable member is in the avoidance position;

[0027] Figure 10 This is an exploded view of the structure of the medium rewinding mechanism provided in the second embodiment of the present invention;

[0028] Figure 11 This is a partial structural diagram of a medium rewinding mechanism provided in the second embodiment of the present utility model;

[0029] Figure 12 This is a cross-sectional view of the structure of the medium rewinding mechanism provided in the second embodiment of the present utility model;

[0030] Figure 13 It is a structural schematic diagram of the movable parts of the medium rewinding mechanism provided in the second embodiment of the present utility model.

[0031] In the picture:

[0032] 1- mandrel; 11- lead screw; 2- reel; 21- first housing; 211- first guide post; 212- first mounting slot; 213- first protrusion; 214- limiting plate; 22- second housing; 221- second guide post; 222- limiting slot; 223- second protrusion; 23- mating portion; 231- supporting surface; 232- avoidance slot; 233- inclined surface; 24- first fastener; 25- second fastener; 3- first elastic member; 31- first compression spring; 32- second compression spring; 4- movable member; 41- supporting portion; 42- main frame; 421- Support plate; 43-rotating shaft; 44-conical body; 441-first spiral groove; 401-first plug-in part; 402-second plug-in part; 442-second spiral groove; 403-third plug-in part; 404-fourth plug-in part; 443-large end; 444-small end; 445-jack; 446-first limiting plane; 45-limiting part; 5-limiting frame; 6-knob; 61-driving part; 7-second elastic member; 8-driving assembly; 81-torsion spring; 82-transmission sleeve; 83-gear; 9-blocking member; 10-third elastic member; 20-connecting frame; 30-abutting member. DETAILED DESCRIPTION

[0033] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0034] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] Example 1

[0038] Figure 1 This is a structural diagram of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 2 This is a partial structural diagram of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 3 This is a structural cross-sectional view of the medium rewinding mechanism provided by the first embodiment of the present invention when the movable member 4 is in the supporting position. Figure 4 This is a structural cross-sectional view of the medium rewinding mechanism provided by the first embodiment of the present invention when the movable member 4 is in the avoidance position. Figure 5 This is a structural exploded view of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 6 This is a structural diagram of the first housing 21 of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 7 This is a partial structural exploded view of the medium rewinding mechanism provided in the first embodiment of the present invention. Figures 1 to 7 As shown, this embodiment provides a medium rewinding mechanism, which includes a core shaft 1, a reel 2, a first elastic member 3 and a movable member 4, wherein the core shaft 1 is configured to rotate around its own axis, the reel 2 is sleeved on the core shaft 1, and the reel 2 is used to wind the medium, and the reel 2 includes a first shell 21 and a second shell 22 that are mutually engaged along the radial direction of the core shaft 1, and the first shell 21 and the second shell 22 can move relative to each other along the radial direction of the core shaft 1 so that the reel 2 is in an extended state or a contracted state; the first elastic member 3 is used to make the reel 2 always have a tendency to change to a contracted state; the movable member 4 is arranged inside the reel 2 And it can slide along the axial direction of the core shaft 1. The movable part 4 has a supporting position and an avoidance position. When the movable part 4 is at the supporting position, the reel 2 is in an extended form. When the movable part 4 is at the avoidance position, the reel 2 is in a contracted form. In the process of the movable part 4 sliding from the avoidance position to the supporting position, the movable part 4 drives the first shell 21 and the second shell 22 to move relative to each other so that the reel 2 changes from the contracted form to the extended form. In the process of the movable part 4 sliding from the supporting position to the avoidance position, the first elastic part 3 drives the first shell 21 and the second shell 22 to move relative to each other so that the reel 2 changes from the extended form to the contracted form.

[0039] In this embodiment, the first housing 21 and the second housing 22 are capable of relative movement along the radial direction of the core shaft 1, which means that at least one of the first housing 21 and the second housing 22 moves relative to the core shaft 1 along the radial direction of the core shaft 1. With this arrangement, when the medium rewinding mechanism needs to rewind the medium, the movable member 4 is located in the supporting position. At this time, the roll 2 is in an extended state. The roll 2 in the extended state tightly wraps the medium around the outer circumference of the roll 2 as the core shaft 1 rotates, forming a cylindrical shape. When the cylindrical medium needs to be removed from the roll 2, the movable member 4 is slid along the core shaft 1 from the supporting position to the avoidance position. The roll 2 changes from the extended state to the retracted state under the action of the first elastic member 3. Since the outer dimension of the retracted roll 2 is smaller than the outer dimension of the reel 2 in the extended state along the direction of relative movement of the first housing 21 and the second housing 22, the gap between the inner surface of the cylindrical medium and the outer surface of the roll 2 becomes larger, thereby reducing the clamping force between the cylindrical medium and the roll 2, facilitating the removal of the medium from the roll 2 and improving the efficiency of media removal.

[0040] In this embodiment, if Figure 3 and Figure 4 As shown, one of the movable member 4 and the reel 2 includes a support portion 41, and the other includes a mating portion 23. The mating portion 23 includes a support surface 231 and an escape groove 232. When the movable member 4 is in the supporting position, the support portion 41 abuts against the support surface 231, thereby extending the reel 2. When the movable member 4 is in the escape position, the support portion 41 extends into the escape groove 232, thereby contracting the reel 2. By ensuring that the support portion 41 cooperates with the support surface 231 or the escape groove 232 when the movable member 4 is in the supporting position or the escape position, the reel 2 can be extended and contracted, resulting in a simple and reliable structure.

[0041] Optionally, in this embodiment, if Figure 3 and Figure 4As shown, the movable part 4 has a first end and a second end along the radial direction of the core shaft 1, and the first end and the second end both include a support portion 41. The first shell 21 and the second shell 22 are symmetrically arranged about the axis of the core shaft 1 and both include a matching portion 23. In the process of the movable part 4 sliding from the avoidance position to the supporting position, the movable part 4 drives the first shell 21 and the second shell 22 to move oppositely relative to the core shaft 1 along the radial direction of the core shaft 1 at the same time, and when the movable part 4 is in the supporting position, the support portion 41 at the first end abuts against the support surface 231 of the first shell 21, and the support portion 41 at the second end abuts against the support surface 231 of the second shell 22; in the process of the movable part 4 sliding from the supporting position to the avoidance position, under the action of the first elastic part 3, the first shell 21 and the second shell 22 move toward each other along the radial direction of the core shaft 1 at the same time relative to the core shaft 1, and when the movable part 4 is in the avoidance position, the support portion 41 at the first end extends into the avoidance groove 232 of the first shell 21, and the support portion 41 at the second end extends into the avoidance groove 232 of the second shell 22. The above arrangement enables the first shell 21 and the second shell 22 to simultaneously move in opposite directions relative to the core shaft 1 when the movable part 4 slides between the supporting position and the avoidance position, thereby improving the efficiency of the reel 2 changing to the extended form or the contracted form. In other embodiments, the position of the first shell 21 relative to the core shaft 1 is fixed, and when the movable part 4 slides between the supporting position and the avoidance position, the second shell 22 moves radially relative to the core shaft 1 and switches the reel 2 between the extended form and the contracted form. In other embodiments, the position of the second shell 22 relative to the core shaft 1 can also be fixed, and when the movable part 4 slides between the supporting position and the avoidance position, the first shell 21 moves radially relative to the core shaft 1 and switches the reel 2 between the extended form and the contracted form.

[0042] Optionally, in this embodiment, when the movable member 4 is in the avoidance position, the support portion 41 at the first end abuts against the bottom of the avoidance groove 232 of the first shell 21, and the support portion 41 at the second end abuts against the bottom wall of the avoidance groove 232 of the second shell 22. In other embodiments, the first shell 21 is provided with a first limiting portion, and the second shell 22 is provided with a second limiting portion. When the movable member 4 is in the avoidance position, under the action of the first elastic member 3, the reel 2 is in a contracted state, the first limiting portion abuts against the second limiting portion, the support portion 41 at the first end is spaced apart from the bottom of the avoidance groove 232 of the first shell 21, and the support portion 41 at the second end is spaced apart from the bottom wall of the avoidance groove 232 of the second shell 22.

[0043] Preferably, in this embodiment, Figures 3 to 6As shown, the first elastic member 3 includes a first compression spring 31 and a second compression spring 32. The first compression spring 31 abuts against the first shell 21, and is used to make the matching portion 23 of the first shell 21 always have a movement tendency close to the support portion 41 at the first end. The second compression spring 32 abuts against the second shell 22, and is used to make the matching portion 23 of the second shell 22 always have a movement tendency close to the support portion 41 at the second end. Optionally, the first shell 21 is provided with a first guide column 211 and a first mounting groove 212 at intervals, and the second shell 22 is provided with a second guide column 221 and a second mounting groove (not shown in the figure) at intervals, the second guide column 221 passes through the bottom wall of the first mounting groove 212 and extends into the first mounting groove 212, the first fastener 24 is connected to the end of the second guide column 221 extending into the first mounting groove 212, and is used to prevent the second guide column 221 from disengaging from the first mounting groove 212, and the first compression spring 31 abuts between the first fastener 24 and the bottom wall of the first mounting groove 212; the first guide column 211 passes through the bottom wall of the second mounting groove and penetrates into the second mounting groove, the second fastener 25 is connected to the end of the first guide column 211 extending into the second mounting groove, and is used to prevent the first guide column 211 from disengaging from the second mounting groove, and the second compression spring 32 abuts between the second fastener 25 and the bottom wall of the second mounting groove. It should be noted that the number of first guide posts 211 and first mounting slots 212 provided in the first housing 21, the number of second guide posts 221 and second mounting slots provided in the second housing 22, and the number of first compression springs 31 and second compression springs 32 can all be set as needed, and the number of first guide posts 211, second mounting slots, and second compression springs 32 is equal, and the number of second guide posts 221, first mounting slots 212, and first compression springs 31 is equal. In this embodiment, by way of example, there are two first guide posts 211, two second mounting slots, and two second compression springs 32, and two second guide posts 221, first mounting slots 212, and first compression springs 31.

[0044] Preferably, the first housing 21 and the second housing 22 are each provided with a plurality of mating portions 23 spaced apart along the axial direction of the core shaft 1. The first and second ends each include a plurality of support portions 41 spaced apart along the axial direction of the core shaft 1. The plurality of support portions 41 at the first end correspond one-to-one with the plurality of mating portions 23 of the first housing 21, and the plurality of support portions 41 at the second end correspond one-to-one with the plurality of mating portions 23 of the second housing 22. This arrangement enables the first housing 21 and the second housing 22 to be jointly supported by the plurality of support portions 41 spaced apart along the axial direction of the core shaft 1 when the movable member 4 is in the supporting position, so that the spool 2 can be reliably maintained in an extended configuration and can reliably wind the media. When the movable member 4 slides to the avoidance position, the first elastic member 3 causes the two ends of the spool 2 along the axial direction of the core shaft 1 to contract synchronously, thereby improving the operability of removing the media from the spool 2.

[0045] In this embodiment, if Figures 5 to 7As shown, the movable part 4 includes a main frame 42 in the shape of a rectangular parallelepiped, the main frame 42 is sleeved with the core shaft 1, the support portion 41 at the first end and the support portion 41 at the second end are respectively arranged at the two ends of the main frame 42 along the first direction, the medium rewinding mechanism also includes two limit frames 5 arranged in parallel and spaced apart, the two limit frames 5 are fixedly connected to the core shaft 1 and are respectively located on both sides of the main frame 42 along the second direction, and the distance between the two limit frames 5 is adapted to the size of the main frame 42 along the second direction; the first shell 21 and the second shell 22 both include two limit plates 214 arranged opposite and spaced apart along the second direction, the support portion 41 at the first end is located between the two limit plates 214 of the first shell 21, the support portion 41 at the second end is located between the two limit plates 214 of the second shell 22, and the size of the support portion 41 along the second direction is adapted to the distance between the two limit plates 214, wherein the first direction, the second direction and the axial direction of the core shaft 1 are perpendicular to each other. The above arrangement, through the two limiting frames 5, jointly limits the position of the movable part 4 relative to the core shaft 1 along the circumferential direction of the core shaft 1. The cooperation of the support portion 41 at the first end with the two limiting plates 214 of the first shell 21 and the support portion 41 at the second end with the two limiting plates 214 of the second shell 22 limits the position of the movable part 4 and the reel 2 along the circumferential direction of the core shaft 1, thereby ensuring that when the core shaft 1 rotates, the reel 2 can be reliably driven to rotate synchronously through the limiting frames 5 and the movable part 4 in sequence, so that the reel 2 can wind the medium. Preferably, the limiting frame 5 and the first shell 21 and the second shell 22 are mutually plugged into each other, and are used to limit the position of the first shell 21 and the second shell 22 relative to the core shaft 1 along the axial direction of the core shaft 1, thereby limiting the position of the reel 2 relative to the core shaft 1 along the axial direction of the core shaft 1, thereby improving the stability of the reel 2 winding the medium.

[0046] In this embodiment, if Figure 3 and Figure 4 As shown, the mating portion 23 further includes an inclined surface 233 connecting the avoidance groove 232 and the support surface 231. The support portion 41 is a roller that can freely rotate around its own axis. During the sliding process of the movable member 4 from the support position to the avoidance position, under the action of the first elastic member 3, the roller rolls along the support surface 231 and the inclined surface 233 to the avoidance groove 232 in sequence. By designing the support portion 41 as a roller that can freely rotate around its own axis, the smoothness of the axial movement of the movable member 4 along the core shaft 1 is improved. Moreover, when the movable member 4 moves between the support position and the avoidance position, the roller rolls along the support surface 231 and the inclined surface 233 to gradually enter the avoidance groove 232, so that the reel 2 can gradually change between the extended state and the contracted state, thereby improving the stability of the reel 2 when extending or contracting.

[0047] Preferably, if Figure 7As shown, the main frame 42 includes two support plates 421 arranged opposite to each other and spaced apart, and the roller is located between the two support plates 421 and is rotatably connected to the two support plates 421 via a rotating shaft 43. The above arrangement ensures the stability and reliability of the rotational connection between the roller and the main frame 42.

[0048] like Figure 3 and Figure 4 As shown, the media rewinding mechanism also includes a knob 6, which is connected to the core shaft 1. The first end of the knob 6 is located outside the reel 2, and the second end of the knob 6 extends into the reel 2 and is connected to the movable part 4. When the knob 6 is rotated in a set direction around the axis of the core shaft 1, it can drive the movable part 4 to slide from the support position to the avoidance position along the axial direction of the core shaft 1. With the above arrangement, by rotating the knob 6, the movable part 4 can be slid to the avoidance position along the axial direction of the core shaft 1, thereby achieving the retraction of the reel 2, which is easy to operate and improves the efficiency of media removal. In other embodiments, when the knob 6 is pushed along the axial direction of the core shaft 1, the knob 6 can drive the movable part 4 to slide to the avoidance position along the axial direction of the core shaft 1. Optionally, the media rewinding mechanism also includes a stopper 9, which is used to prevent the knob 6 from disengaging from the core shaft 1.

[0049] In this embodiment, if Figure 3 and Figure 4As shown, the medium rewinding mechanism also includes a second elastic member 7, which is configured to enable the movable member 4 to always have a movement tendency to slide toward the support position and abut against the second end of the knob 6. The core shaft 1 is provided with a screw 11, and the knob 6 is connected to the core shaft 1 through the screw 11. The screw 11 is configured to enable the knob 6 to rotate around the axis of the core shaft 1 and slide along the axial direction of the core shaft 1 when subjected to an axial force along the core shaft 1; when the external force rotates the knob 6 in the set direction, the knob 6 overcomes the elastic force of the second elastic member 7 and slides relative to the core shaft 1 and drives the movable member 4 to slide to the avoidance position; when the external force is eliminated, the movable member 4 is reset to the support position under the drive of the second elastic member 7, and the movable member 4 sliding toward the support position drives the knob 6 to rotate in the opposite direction of the set direction while sliding synchronously with the movable member 4 along the axial direction of the core shaft 1. In this embodiment, the screw 11 is configured to enable the knob 6 to rotate around the axis of the core shaft 1 and slide along the axial direction of the core shaft 1 when subjected to an axial force along the core shaft 1, that is, there is no self-locking between the knob 6 and the screw 11. Specifically, the screw 11 is configured so that the helix angle is much larger than the static friction angle. Such a setting makes it necessary for the operator to apply an external force to the knob 6 to rotate the knob 6 in the set direction. The rotating knob 6 simultaneously slides relative to the core shaft 1 along the axial direction of the core shaft 1. The sliding of the knob 6 drives the movable part 4 to slide synchronously with the knob 6 along the axial direction of the core shaft 1 to the avoidance position, so that the roll 2 changes to a contracted shape under the action of the first elastic member 3, which facilitates the removal of the medium from the roll 2; after the medium is removed from the roll 2, the operator releases the knob 6 to eliminate the external force. Since there is no self-locking between the knob 6 and the screw 11, the axial force of the second elastic member 7 along the core shaft 1 is transmitted to the knob 6 through the movable part 4, and the second elastic member 7 drives the knob 6 to automatically rotate in the opposite direction of the set direction and slide along the axial direction of the core shaft 1 to restore the movable part 4 to the support position. The operator does not need to rotate the knob 6 in the opposite direction of the set direction, which is convenient for operation. In other embodiments, when the knob 6 rotates around the axis of the core shaft 1 in a set direction, the movable part 4 is driven to move to the avoidance position, and when the knob 6 rotates around the axis of the core shaft 1 in the opposite direction of the set direction, the movable part 4 is driven to move to the supporting position.

[0050] Optionally, in this embodiment, the second elastic member 7 is a spring, and the medium rewinding mechanism further includes an abutment member 30 connected to at least one of the core shaft 1, the first housing 21, and the second housing 22. The spring is sleeved on the core shaft 1 and is sandwiched between the abutment member and the movable member 4. In this embodiment, the abutment member 30 is fixedly sleeved on the core shaft 1.

[0051] In this embodiment, if Figures 1 to 5As shown, the media rewind mechanism also includes a drive assembly 8 in transmission connection with the core shaft 1. Drive assembly 8 is configured to be in transmission connection with the printer's drive mechanism, driving the core shaft 1 to rotate the spool 2. Optionally, drive assembly 8 includes a torsion spring 81, a transmission sleeve 82, and a gear 83 in transmission connection with the printer's drive mechanism. The transmission sleeve 82 is sleeved onto the end of the core shaft 1 away from the knob 6. One end of the torsion spring 81 is tightly attached to the core shaft 1, while the other end of the torsion spring 81 is in tension with the inner wall of the transmission sleeve 82. The transmission sleeve 82 is fixedly connected to the gear 83. The drive mechanism rotates via the drive gear 83, which in turn drives the core shaft 1 via the transmission sleeve 82 and torsion spring 81. The rotation of the core shaft 1 drives the spool 2 to rotate synchronously and wind the media.

[0052] This embodiment further provides a printer comprising a frame and the aforementioned media rewind mechanism. The media rewind mechanism is mounted on the frame and is used to rewind a used ribbon. One end of a core shaft 1 of the media rewind mechanism is supported by the frame, while the other end is suspended in the air. The printer provided in this embodiment utilizes the aforementioned media rewind mechanism to facilitate removal of the media from the roll 2, thereby improving media removal efficiency.

[0053] Optionally, the printer also includes a paper roll support mechanism, a printing mechanism and a carbon ribbon dispensing mechanism, wherein the paper roll support mechanism is used to support the printing paper roll, and the printing mechanism is arranged downstream of the paper roll support mechanism along the conveying direction of the printing paper for printing the printing paper, and the carbon ribbon dispensing mechanism is used to support an unused carbon ribbon roll.

[0054] Example 2

[0055] Figure 8 This is a structural cross-sectional view of the medium rewinding mechanism provided by the second embodiment of the present invention when the movable member 4 is in the supporting position. Figure 9 This is a structural cross-sectional view of the medium rewinding mechanism provided by the second embodiment of the present invention when the movable member 4 is in the avoidance position. Figure 10 This is a structural exploded view of the medium rewinding mechanism provided in the second embodiment of the present invention. Figure 11 This is a partial structural diagram of the medium rewinding mechanism provided in the second embodiment of the present invention. Figure 12 This is a cross-sectional view of the structure of the medium rewinding mechanism provided in the second embodiment of the present invention. Figure 13 This is a schematic structural diagram of the movable member 4 of the medium rewinding mechanism provided in the second embodiment of the present invention. Figures 8 to 13 As shown, the medium rewinding mechanism provided in this embodiment is basically the same as that in the first embodiment. The difference between the medium rewinding mechanism provided in this embodiment and that in the first embodiment is that:

[0056] The movable part 4 includes a conical body 44 coaxially sleeved with the core shaft 1, and the conical body 44 can slide along the axial direction of the core shaft 1 while rotating around the axis of the core shaft 1. The conical body 44 includes a large end 443 and a small end 444 spaced apart along its axial direction. The outer peripheral surface of the conical body 44 is spaced apart by a first spiral groove 441 and a second spiral groove 442 both extending spirally along the axial direction of the conical body 44. The first spiral groove 441 has a first plug-in portion 401 and a second plug-in portion 402, and the second spiral groove 442 has a third plug-in portion 403 and a fourth plug-in portion 404. Along the direction from the large end 443 to the small end 444, the first plug-in portion 401 is located upstream of the second plug-in portion 402, and the third plug-in portion 403 is located upstream of the fourth plug-in portion 404. The inner wall of the first shell 21 is provided with a first protrusion 213, and the inner wall of the second shell 22 is provided with a second protrusion 223. The first protrusion The part 213 is plugged into the first spiral groove 441 and the second protrusion 223 is plugged into the second spiral groove 442; when the cone 44 rotates, the first protrusion 213 and the second protrusion 223 jointly drive the cone 44 to slide along the axial direction of the core shaft 1, so that the plug-in position of the first protrusion 213 and the first spiral groove 441 changes between the first plug-in portion 401 and the second plug-in portion 402, and the plug-in position of the second protrusion 223 and the second spiral groove 442 changes between the third plug-in portion 403 and the fourth plug-in portion 404, wherein, when the movable part 4 is in the supporting position, the first protrusion 213 is plugged into the first plug-in portion 401, and the second protrusion 223 is plugged into the third plug-in portion 403; when the movable part 4 is in the avoidance position, the first protrusion 213 cooperates with the second plug-in portion 402, and the second protrusion 223 cooperates with the fourth plug-in portion 404.

[0057] In this embodiment, the distance between the first plug-in portion 401 of the first spiral groove 441 and the axis of the core shaft 1 is greater than the distance between the second plug-in portion 402 and the axis of the core shaft 1, and the distance between the third plug-in portion 403 of the second spiral groove 442 and the axis of the core shaft 1 is greater than the distance between the fourth plug-in portion 404 and the axis of the core shaft 1. Under the action of the first elastic member 3, the first protrusion 213 is always plugged into the first spiral groove 441, and the second protrusion 223 is always plugged into the second spiral groove 442. When the movable member 4 is rotated, The first protrusion 213 and the second protrusion 223 drive the movable part 4 to slide axially along the core shaft 1, so that the plug-in position of the first protrusion 213 and the first spiral groove 441 changes between the first plug-in part 401 and the second plug-in part 402, and the plug-in position of the second protrusion 223 and the second spiral groove 442 changes between the third plug-in part 403 and the fourth plug-in part 404, thereby realizing the radial opposite movement or opposite movement of the first shell 21 and the second shell 22 along the core shaft 1, thereby realizing the extension or contraction of the reel 2.

[0058] Optionally, in this embodiment, if Figures 10 to 12As shown, the media rewind mechanism includes a connecting frame 20 fixedly connected to the core shaft 1. Both the first housing 21 and the second housing 22 are provided with limiting slots 222. The connecting frame 20 engages with the limiting slots 222 of the first housing 21 and the second housing 22, thereby limiting the axial and circumferential positions of the first housing 21 and the second housing 22 relative to the core shaft 1. When the core shaft 1 rotates, the connecting frame 20 drives the first and second housings 21 and 22 to rotate synchronously about the axis of the core shaft 1, thereby causing the media to be wound around the spool 2. Optionally, the media rewind mechanism includes at least two sets of connecting frames 20 spaced apart along the axial direction of the core shaft 1. Each set of connecting frames 20 includes two connecting frames 20 spaced apart along the radial direction of the core shaft, and both connecting frames 20 are fixedly connected to the core shaft 1. This arrangement further improves the reliability of the spool 2 rotating with the core shaft 1.

[0059] Preferably, the movable member 4 further includes a limiting portion 45 connected to the conical body 44. When the movable member 4 is in the supporting position, the limiting portion 45 abuts against one of the two connecting frames 20 in each group of connecting frames 20. When the movable member 4 is in the avoiding position, the limiting portion 45 abuts against the other of the two connecting frames 20. The limiting portion 45 is used to limit the rotation angle of the knob 6. Optionally, the movable member 4 includes two limiting portions 45 connected to the conical body 44. The two limiting portions 45 are spaced apart along the circumferential direction of the core shaft 1. When the movable member 4 is in the supporting position and the avoiding position, the two limiting portions 45 abut against the two connecting frames 20, respectively.

[0060] It should be noted that, in this embodiment, the second end of the knob 6 extends into the reel 2 and is connected to the cone 44 to ensure that when the knob 6 rotates along the set direction around the axis of the core shaft 1, it can drive the cone 44 to rotate around the axis of the core shaft 1.

[0061] In this embodiment, if Figure 8 、 Figure 9 and Figure 13 As shown, the medium rewinding mechanism further includes a third elastic member 10 , which abuts against the knob 6 to ensure that the second end of the knob 6 is always plugged into the conical body 44 .

[0062] Preferably, the movable part 4 includes a frame body and a plurality of conical bodies 44 arranged on the frame body at axial intervals along the core shaft 1. The extension direction from the large end 443 to the small end 444 of the plurality of conical bodies 44 is the same. The first shell 21 is correspondingly provided with a plurality of first protrusions 213, and the second shell 22 is correspondingly provided with a plurality of second protrusions 223. The plurality of first protrusions 213 are plugged into the first spiral grooves 441 of the plurality of conical bodies 44 one by one, and the plurality of second protrusions 223 are plugged into the second spiral grooves 442 of the plurality of conical bodies 44 one by one. The limiting portion 45 is connected between two adjacent conical bodies 44.

[0063] Optionally, one of the multiple cones 44 is provided with a socket 445, the socket 445 has a first limiting plane 446, the knob 6 includes a driving part 61, the driving part 61 has a second limiting plane, the driving part 61 is plugged into the socket 445, and the second limiting plane cooperates with the first limiting plane 446, so that when the knob 6 rotates, it can drive the multiple cones 44 to rotate synchronously.

[0064] The printer provided in this embodiment utilizes the above-mentioned medium rewinding mechanism to facilitate the removal of the medium from the roll 2, thereby improving the efficiency of medium removal.

[0065] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A medium rewinding mechanism, characterized in that: The invention comprises a core shaft (1), a reel (2), a first elastic member (3) and a movable member (4); the core shaft (1) is configured to rotate around its own axis; the reel (2) is sleeved on the core shaft (1); the reel (2) is used to wind a medium; the reel (2) comprises a first shell (21) and a second shell (22) which are engaged with each other along the radial direction of the core shaft (1); the first shell (21) and the second shell (22) can move relative to each other along the radial direction of the core shaft (1) so that the reel (2) is in an extended state or a contracted state; The first elastic member (3) is used to ensure that the reel (2) always has a tendency to change toward the contracted shape; The movable member (4) is arranged in the reel (2) and can slide along the axial direction of the core shaft (1). The movable member (4) has a supporting position and an avoidance position. When the movable member (4) is located at the supporting position, the reel (2) is in the extended form. When the movable member (4) is located at the avoidance position, the reel (2) is in the contracted form. In the process of the movable member (4) sliding from the avoidance position to the supporting position, the movable member (4) drives the first shell (21) and the second shell (22) to move relative to each other so that the reel (2) changes from the contracted form to the extended form. In the process of the movable member (4) sliding from the supporting position to the avoidance position, the first elastic member (3) drives the first shell (21) and the second shell (22) to move relative to each other so that the reel (2) changes from the extended form to the contracted form.

2. The medium rewinding mechanism according to claim 1, characterized in that: One of the movable member (4) and the reel (2) includes a supporting portion (41), and the other of the movable member (4) and the reel (2) includes a matching portion (23), and the matching portion (23) includes a supporting surface (231) and an avoidance groove (232). When the movable member (4) is located at the supporting position, the supporting portion (41) abuts against the supporting surface (231) so that the reel (2) is in the extended form; when the movable member (4) is located at the avoidance position, the supporting portion (41) extends into the avoidance groove (232) so that the reel (2) is in the contracted form.

3. The medium rewinding mechanism according to claim 2, characterized in that: The movable member (4) has a first end and a second end along the radial direction of the core shaft (1), the first end and the second end both comprising the support portion (41), the first shell (21) and the second shell (22) being symmetrically arranged about the axis of the core shaft (1) and both comprising the fitting portion (23); During the sliding of the movable member (4) from the avoidance position to the support position, the movable member (4) drives the first shell (21) and the second shell (22) to move in opposite directions relative to the core shaft (1) along the radial direction of the core shaft (1), and when the movable member (4) is located at the support position, the support portion (41) at the first end abuts against the support surface (231) of the first shell (21), and the support portion (41) at the second end abuts against the support surface (231) of the second shell (22); During the sliding of the movable member (4) from the supporting position to the avoiding position, under the action of the first elastic member (3), the first shell (21) and the second shell (22) simultaneously move toward each other along the radial direction of the core shaft (1) relative to the core shaft (1), and when the movable member (4) is located at the avoiding position, the supporting portion (41) at the first end extends into the avoiding groove (232) of the first shell (21), and the supporting portion (41) at the second end extends into the avoiding groove (232) of the second shell (22).

4. The medium rewinding mechanism according to claim 3, characterized in that: The movable part (4) includes a main frame (42) in the shape of a rectangular parallelepiped, the main frame (42) is sleeved with the core shaft (1), the support portion (41) at the first end and the support portion (41) at the second end are respectively arranged at two ends of the main frame (42) along the first direction, and the medium rewinding mechanism also includes two limit frames (5) arranged in parallel and spaced apart, the two limit frames (5) are fixedly connected to the core shaft (1) and are respectively located on both sides of the main frame (42) along the second direction, and the distance between the two limit frames (5) is adapted to the size of the main frame (42) along the second direction; The first shell (21) and the second shell (22) both include two limit plates (214) that are arranged opposite to each other and spaced apart along the second direction, the support portion (41) at the first end is located between the two limit plates (214) of the first shell (21), and the support portion (41) at the second end is located between the two limit plates (214) of the second shell (22), and the size of the support portion (41) along the second direction is adapted to the distance between the two limit plates (214), wherein the first direction, the second direction and the axial direction of the core shaft (1) are perpendicular to each other.

5. The medium rewinding mechanism according to claim 2, characterized in that: The matching portion (23) further includes an inclined surface (233) connecting the avoidance groove (232) and the support surface (231); the support portion (41) is a roller that can freely rotate around its own axis; when the movable member (4) slides from the support position to the avoidance position, under the action of the first elastic member (3), the roller rolls in sequence along the support surface (231) and the inclined surface (233) to the avoidance groove (232).

6. The medium rewinding mechanism according to claim 2, characterized in that: The medium rewinding mechanism further comprises a knob (6), wherein the knob (6) is connected to the core shaft (1), a first end portion of the knob (6) is located outside the reel (2), and a second end portion of the knob (6) extends into the reel (2) and is connected to the movable member (4), and when the knob (6) rotates along a set direction around the axis of the core shaft (1), the movable member (4) can be driven to slide along the axial direction of the core shaft (1) from the supporting position to the avoiding position.

7. The medium rewinding mechanism according to claim 6, characterized in that: The medium rewinding mechanism further comprises a second elastic member (7), wherein the second elastic member (7) is configured to enable the movable member (4) to always have a movement tendency of sliding toward the supporting position and abutting against the second end of the knob (6); The core shaft (1) is provided with a screw (11), and the knob (6) is connected to the core shaft (1) through the screw (11), and the screw (11) is configured to enable the knob (6) to rotate around the axis of the core shaft (1) and slide along the axial direction of the core shaft (1) when subjected to an axial force along the core shaft (1); when an external force rotates the knob (6) along the set direction, the knob (6) overcomes the elastic force of the second elastic member (7) to slide relative to the core shaft (1) and drives the movable member (4) to slide to the avoidance position; when the external force is eliminated, the movable member (4) is driven by the second elastic member (7) to return to the support position, and the movable member (4) sliding toward the support position drives the knob (6) to rotate in the opposite direction of the set direction while sliding synchronously with the movable member (4) along the axial direction of the core shaft (1).

8. The medium rewinding mechanism according to claim 2, characterized in that: The movable part (4) includes a conical body (44) coaxially sleeved with the core shaft (1), and the conical body (44) can slide along the axial direction of the core shaft (1) while rotating around the axis of the core shaft (1). The conical body (44) includes a large end (443) and a small end (444) spaced apart along its axial direction. The outer peripheral surface of the conical body (44) is spaced apart and provided with a first spiral groove (441) and a second spiral groove (442) both extending spirally along the axial direction of the conical body (44). The first spiral groove (441) has a first plug-in portion (401) and a second plug-in portion (402). The second spiral groove (442) The invention comprises a third plug-in portion (403) and a fourth plug-in portion (404); along the direction from the large end (443) to the small end (444), the first plug-in portion (401) is located upstream of the second plug-in portion (402), and the third plug-in portion (403) is located upstream of the fourth plug-in portion (404); the inner wall of the first shell (21) is provided with a first protrusion (213), and the inner wall of the second shell (22) is provided with a second protrusion (223); the first protrusion (213) is plugged into the first spiral groove (441), and the second protrusion (223) is plugged into the second spiral groove (442); When the cone (44) rotates, the first protrusion (213) and the second protrusion (223) jointly drive the cone (44) to slide along the axial direction of the core shaft (1), so that the plug-in position of the first protrusion (213) and the first spiral groove (441) changes between the first plug-in portion (401) and the second plug-in portion (402), and the plug-in position of the second protrusion (223) and the second spiral groove (442) changes between the first plug-in portion (401) and the second plug-in portion (402). 3) and the fourth plug-in portion (404), wherein, when the movable part (4) is located at the supporting position, the first protrusion (213) is plugged into the first plug-in portion (401), and the second protrusion (223) is plugged into the third plug-in portion (403); when the movable part (4) is located at the avoiding position, the first protrusion (213) is matched with the second plug-in portion (402), and the second protrusion (223) is matched with the fourth plug-in portion (404).

9. The medium rewinding mechanism according to claim 8, characterized in that: The medium rewinding mechanism further comprises a knob (6), wherein the knob (6) is sleeved with the core shaft (1), a first end portion of the knob (6) is located outside the reel (2), and a second end portion of the knob (6) extends into the reel (2) and is connected to the cone (44), and when the knob (6) rotates in a set direction around the axis of the core shaft (1), the cone (44) can be driven to rotate around the axis of the core shaft (1).

10. A printer, characterized in that: The invention comprises a frame and a medium rewinding mechanism according to any one of claims 1 to 9, wherein the medium rewinding mechanism is arranged on the frame and is used to rewind the used carbon ribbon, and one end of the core shaft (1) of the medium rewinding mechanism is supported by the frame and the other end is suspended.

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