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 baffle and a pressing piece, the core shaft can rotate around the axis of the core shaft, the winding drum is arranged on the core shaft in a sleeving mode and can synchronously rotate along with the core shaft, the winding drum is used for winding a medium, and the baffle is connected with one end of the winding drum in the axial direction of the core shaft and used for limiting the position of the medium wound around the winding drum in the axial direction of the core shaft. The first end of the pressing and holding piece is connected with the baffle, the length of the pressing and holding piece extends in the axial direction of the mandrel, and the pressing and holding piece is used for pressing and holding the medium to the winding drum. When the medium rewinding mechanism rewinds a medium, only the medium needs to be placed between the pressing piece and the winding drum, the pressing piece presses the medium on the winding drum, the position of the medium relative to the winding drum is fixed, the winding drum can drive the medium to be wound on the winding drum when rotating along with the mandrel, operation is easy, and the installation efficiency of the medium is improved. And meanwhile, the baffle can prevent the wound medium from moving along the axial position of the mandrel, so that the medium is wound more regularly.

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] A printer typically includes a media dispensing mechanism and a media rewinding mechanism. The media dispensing mechanism is used to dispense unused media (such as carbon ribbons or label paper), while the media rewinding mechanism is used to rewind used media. The media rewinding mechanism provided in the related art includes a core shaft and a reel rotatably mounted on the core shaft. The core shaft can drive the reel to rotate synchronously when rotating about its own axis. The reel is used to wind the media. Before the printer prints, the media drawn from the media dispensing mechanism needs to be pre-wound around the reel several times to secure the end of the media to the reel. This ensures that the media can rotate with the reel and be wound around the reel during printing. The media rewinding mechanism in the related art has the problem of a cumbersome media installation process, which is not conducive to improving media installation efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a medium rewinding mechanism and a printer. The medium rewinding mechanism is simple to operate, can improve the installation efficiency of the medium, and can also make the medium winding more regular.

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

[0005] A medium rewinding mechanism includes a core shaft, a reel, a baffle and a pressure holding member. The core shaft is configured to rotate around its own axis. The reel is sleeved on the core shaft and can rotate synchronously with the core shaft. The reel is used to wind the medium. Along the axial direction of the core shaft, the baffle is connected to one end of the reel and is used to limit the axial position of the medium wound on the reel along the core shaft; the first end of the pressure holding member is connected to the baffle, the length of the pressure holding member extends along the axial direction of the core shaft, and the pressure holding member is used to press the medium on the reel.

[0006] As an optional solution, the first end of the pressing member is movably connected to the baffle, and the pressing member has an avoidance position and a pressing position when moving relative to the baffle. When the pressing member is located at the avoidance position, an operating space for installing the medium is formed between the pressing member and the roll. When the pressing member is located at the pressing position, the pressing member and the roll are arranged opposite to each other along the radial direction of the core shaft and a gap for clamping the medium can be formed between the two.

[0007] As an optional solution, the first end of the pressing member is pivotally connected to the baffle, and the pressing member can rotate around the pivot axis relative to the baffle so that the pressing member is located in the pressing position or the avoidance position; the medium rewinding mechanism also includes a first locking member, which is used to lock the pressing member in the pressing position.

[0008] As an optional solution, the first locking member includes a first clamping portion provided at the second end of the pressing member and a second clamping portion provided at the reel, the first clamping portion being capable of being engaged with or separated from the second clamping portion, and when the first clamping portion is engaged with the second clamping portion, the first locking member locks the pressing member in the pressing position; or, the first locking member includes a magnetic member and an attractive member, the magnetic member being provided at one of the second end of the pressing member and the reel, the attractive member being provided at the other of the two, the attractive member being capable of being engaged with or separated from the magnetic member, and when the attractive member is engaged with the magnetic member, the first locking member locks the pressing member in the pressing position.

[0009] As an optional solution, the pressing member is made of elastic material, the first end of the pressing member is fixedly connected to the baffle, and the second end of the pressing member is suspended. Along the radial direction of the core shaft, the pressing member and the reel are arranged opposite to each other and a gap for clamping the medium can be formed between the two.

[0010] As an optional solution, the pressing member includes a base frame and a friction portion, the first end of the base frame is connected to the baffle, the friction portion is fixed to the base frame and extends along the axial direction of the core shaft, and the friction coefficient of the friction portion is greater than the friction coefficient of the base frame, and the friction portion is used to abut against the medium and press the medium against the roll.

[0011] As an optional solution, the outer surface of the reel is provided with a long groove extending along the axial direction of the core shaft, and the holding member is used to hold the medium in the long groove.

[0012] As an optional solution, the reel includes a first shell and a second shell that are interlocked along the radial direction of the core shaft, and the first shell and the second shell can simultaneously move away from or towards each other along the radial direction of the core shaft relative to the core shaft to make the reel take an extended form or a contracted form; the baffle includes a first baffle and a second baffle that are interlocked, the first baffle is connected to the first shell, and the second baffle is connected to the second shell, and at least one of the first baffle and the second baffle is provided with the holding member.

[0013] As an optional solution, the medium rewinding mechanism further includes a support member, an elastic member and a second locking member, the support member is fixedly connected to the core shaft, the support member is provided with a support surface, the outer diameter of the support surface gradually decreases along the first direction; the first shell and the second shell are both sleeved with the support member, and the first shell and the second shell can simultaneously move relative to the core shaft along the first direction or the second direction under the action of an external force, the first shell includes a first conical surface, the second shell includes a second conical surface, the outer diameter of the first conical surface and the outer diameter of the second conical surface both gradually decrease along the first direction; the elastic member is configured to make the first conical surface and the second conical surface always abut against the support surface, when the first When the shell and the second shell move relative to the core shaft along the second direction at the same time, the support surface drives the first shell and the second shell to move relative to the core shaft along the radial direction of the core shaft through the first conical surface and the second conical surface, so that the reel changes to the extended form. When the first shell and the second shell move relative to the core shaft along the first direction at the same time, the elastic member drives the first shell and the second shell to move relative to the core shaft along the radial direction of the core shaft, so that the reel changes to the contracted form; the second locking member is used to lock the reel in the extended form; wherein the first direction and the second direction are opposite and both are parallel to the axial direction of the core shaft.

[0014] A printer comprises a frame and the above-mentioned medium rewinding mechanism, wherein the medium rewinding mechanism is arranged on the frame and is used to rewind a used carbon ribbon.

[0015] Beneficial effects of the utility model:

[0016] The utility model provides a medium rewinding mechanism, which includes a core shaft, a reel, a baffle and a pressure holding member, wherein the core shaft is configured to rotate around its own axis, the reel is sleeved on the core shaft and can rotate synchronously with the core shaft, the reel is used to wind the medium, along the axial direction of the core shaft, the baffle is connected to one end of the reel, and is used to limit the axial position of the medium wound on the reel along the core shaft, the first end of the pressure holding member is connected to the baffle, the length of the pressure holding member extends along the axial direction of the core shaft, and the pressure holding member is used to press the medium on the reel. The medium rewinding mechanism provided by the present invention has the following advantages: when the medium rewinding mechanism needs to rewind the medium, the medium only needs to be placed between the pressing member and the reel. The pressing member presses the medium against the reel to fix the position of the medium relative to the reel. When the reel rotates with the core shaft, the medium can be reliably driven to be wound around the reel. The operation is simple and the installation efficiency of the medium is improved. At the same time, the baffle can limit the axial position of the medium wound on the reel along the core shaft, preventing the wound medium from moving along the axial position of the core shaft, so that the medium is wound more regularly.

[0017] The present invention also provides a printer comprising a frame and the aforementioned media rewind mechanism, the media rewind mechanism being disposed on the frame and configured to rewind a used ribbon. The printer provided by the present invention utilizes the aforementioned media rewind mechanism, facilitating simplified operation, improving ribbon installation efficiency, and ensuring more regular ribbon winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of the medium rewinding mechanism provided by the first embodiment of the present invention when the pressing member is in the pressing position;

[0019] Figure 2 This is a structural schematic diagram of the medium rewinding mechanism provided by the first embodiment of the present invention when the pressing member is in the avoidance position;

[0020] Figure 3 This is a partial structural cross-section of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 1 ;

[0021] Figure 4 This is a partial structural diagram of the medium rewinding mechanism provided in the first embodiment of the present utility model;

[0022] Figure 5 This is a structural cross-sectional view of a holding member of a medium rewinding mechanism provided in the first embodiment of the present invention;

[0023] Figure 6 This is a structural cross-sectional view of the medium rewinding mechanism provided in the first embodiment of the present invention when the roll is in an extended state;

[0024] Figure 7 This is a structural cross-sectional view of the medium rewinding mechanism provided in the first embodiment of the present invention when the roll is in a retracted state;

[0025] Figure 8 This is an exploded view of the structure of the medium rewinding mechanism provided in the first embodiment of the present invention;

[0026] Figure 9 This is a partial structural cross-section of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 2 ;

[0027] Figure 10 This is a structural diagram of a medium rewinding mechanism provided in the second embodiment of the present invention;

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

[0029] In the picture:

[0030] 1. Mandrel; 2. Reel; 21. First housing; 211. First conical surface; 22. Second housing; 221. Second conical surface; 222. Second groove; 23. Long groove; 24. Limiting groove; 3. Baffle; 31. First baffle; 32. Second baffle; 33. Limiting surface; 34. Avoidance groove; 4. Pressing member; 41. Base; 411. Fixing groove; 42. Friction portion; 43. First plate; 44. Second plate; 45. Third plate; 5. First locking member; 51. First engaging portion; 511. Elastic portion; 501. First elastic plate; 502. Second elastic plate; 503. Operating plate; 512. First buckle; 52. Second clamping portion; 6. Support member; 61. Support surface; 62. Guide column; 621. Slot; 63. Protrusion; 64. First supporting section; 65. Second supporting section; 7. Elastic member; 8. Second locking member; 81. Buckle; 9. Operating member; 91. Mounting cavity; 92. Guide groove; 10. First elastic member; 20. Second elastic member; 30. Rotating shaft; 40. Fastener; 50. Return spring. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Example 1

[0036] Figure 1 This is a structural diagram of the medium rewinding mechanism provided in the first embodiment of the present invention when the pressing member 4 is in the pressing position. Figure 2 This is a structural diagram of the medium rewinding mechanism provided by the first embodiment of the present invention when the pressing member 4 is in the avoidance position. Figure 3 This is a partial structural cross-section of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 1 , Figure 4 This is a partial structural diagram of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 5 This is a structural cross-sectional view of the holding member 4 of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 6 This is a cross-sectional view of the structure of the medium rewinding mechanism provided in the first embodiment of the present invention when the reel 2 is in an extended state. Figure 7 This is a structural cross-sectional view of the medium rewinding mechanism provided in the first embodiment of the present invention when the reel 2 is in a retracted state. Figure 8 This is a structural exploded view of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 9 This is a partial structural cross-section of the medium rewinding mechanism provided in the first embodiment of the present invention. Figure 2 .like Figures 1 to 9As shown, this embodiment provides a medium rewinding mechanism, which includes a core shaft 1, a reel 2, a baffle 3 and a pressure holding member 4. The core shaft 1 is configured to rotate around its own axis, and the reel 2 is sleeved on the core shaft 1 and can rotate synchronously with the core shaft 1. The reel 2 is used to wind the medium. Along the axial direction of the core shaft 1, the baffle 3 is connected to one end of the reel 2 for limiting the axial position of the medium wound on the reel 2 along the core shaft 1. The first end of the pressure holding member 4 is connected to the baffle 3, and the length of the pressure holding member 4 extends along the axial direction of the core shaft 1. The pressure holding member 4 is used to press the medium on the reel 2. The medium rewinding mechanism provided in this embodiment only needs to place the medium between the pressure holding member 4 and the reel 2 when the medium rewinding mechanism needs to rewind the medium. The pressure holding member 4 presses the medium against the reel 2, so that the position of the medium relative to the reel 2 is fixed. When the reel 2 rotates with the core shaft 1, the medium can be reliably driven to be wound around the reel 2. The operation is simple and the installation efficiency of the medium is improved. At the same time, the baffle 3 can limit the axial position of the medium wound on the reel 2 along the core shaft 1, preventing the wound medium from moving along the axial position of the core shaft 1, so that the medium is wound more regularly.

[0037] Preferably, the medium rewinding mechanism includes at least two holding members 4 spaced apart along the rotation direction of the reel 2, and the at least two holding members 4 jointly hold the medium against the reel 2. The above arrangement increases the holding area for the medium and further improves the reliability of holding the medium.

[0038] In this embodiment, if Figure 1 and Figure 2 As shown, the first end of the pressure member 4 is movably connected to the baffle 3. When the pressure member 4 moves relative to the baffle 3, it has a retractable position and a retaining position. When the pressure member 4 is in the retractable position, an operating space for installing the media is formed between the pressure member 4 and the reel 2. When the pressure member 4 is in the retaining position, the pressure member 4 and the reel 2 are radially opposed to each other along the core shaft 1, and a gap is formed between them for clamping the media. When installing the media in the media rewind mechanism, the pressure member 4 is first positioned in the retractable position to place the media between the pressure member 4 and the reel 2. The pressure member 4 is then positioned in the retaining position to secure the media, thereby improving the ease of media installation.

[0039] In this embodiment, if Figures 1 to 3As shown, the first end of the holding member 4 is pivotally connected to the baffle 3. The holding member 4 can rotate relative to the baffle 3 about the pivot axis to position the holding member 4 in a holding position or a retracting position. The media rewinding mechanism also includes a first locking member 5 for locking the holding member 4 in the holding position. Optionally, the media rewinding mechanism also includes a first elastic member 10 for ensuring that the holding member 4 always has a tendency to rotate toward the retracting position. When the media rewinding mechanism needs to rewind the media, the holding member 4 is first positioned in the retracting position. Under the action of the first elastic member 10, the holding member 4 can be maintained in the retracting position, eliminating the need for the operator to hold the media, making it easier for the operator to place the media between the holding member 4 and the roll 2. Once the media is placed between the holding member 4 and the roll 2, the holding member 4 is rotated to the holding position, causing the first locking member 5 to lock the holding member 4 in the holding position. The holding member 4 then presses the media against the outer wall of the roll 2.

[0040] Preferably, the holding member 4 is pivotally connected to the baffle 3 via a rotating shaft 30. The axial direction of the rotating shaft 30 is perpendicular to the axial direction of the core shaft 1. The first elastic member 10 is a torsion spring sleeved on the rotating shaft 30. Preferably, the baffle 3 includes a limiting surface 33 and a relief groove 34 extending through the limiting surface 33. The limiting surface 33 is used to limit the axial position of the medium wound on the spool 2 along the core shaft 1. The two ends of the rotating shaft 30 are supported by the two opposing walls of the relief groove 34. The first end of the holding member 4 passes through the limiting surface 33 and sleeves onto the rotating shaft 30. This arrangement ensures that the installation position of the rotating shaft 30 does not interfere with the winding of the medium. In other embodiments, the axial direction of the rotating shaft 30 is parallel to the axial direction of the core shaft 1 and spaced apart. In other embodiments, the first end of the holding member 4 is slidably connected to the baffle 3. The holding member 4 can slide relative to the baffle 3 along the radial direction of the core shaft 1 between a holding position and a relief position, allowing the holding member 4 to move closer to or further away from the outer wall of the spool 2.

[0041] In this embodiment, if Figures 2 to 4 As shown, the first locking member 5 includes a first clamping portion 51 provided at the second end of the pressing member 4 and a second clamping portion 52 provided at the reel 2. The first clamping portion 51 can be engaged with or separated from the second clamping portion 52, and when the first clamping portion 51 is engaged with the second clamping portion 52, the first locking member 5 locks the pressing member 4 in the pressing position. The structural design of the above-mentioned first locking member 5 improves the reliability of the first locking member 5 locking the pressing member 4 in the pressing position, thereby improving the reliability of the pressing member 4 fixing the end of the medium to the reel 2. In other embodiments, the first locking member 5 includes a magnetic member and an attractive member. The magnetic member is provided at one of the second end of the pressing member 4 and the reel 2, and the attractive member is provided at the other of the two. The attractive member can be engaged with or separated from the magnetic member, and when the attractive member is engaged with the magnetic member, the first locking member 5 locks the pressing member 4 in the pressing position.

[0042] In this embodiment, if Figures 2 to 4As shown, the first clamping portion 51 includes an elastic portion 511 and a first clamping buckle 512 arranged on the elastic portion 511, the reel 2 is provided with a limiting groove 24, and the second clamping portion 52 is a second clamping buckle arranged on the side wall of the limiting groove 24. When the pressing member 4 is in the pressing position, the elastic portion 511 is embedded in the limiting groove 24, and under the elastic action of the elastic portion 511, the first clamping buckle 512 is engaged with the second clamping buckle. When external force acts on the elastic portion 511 and causes the elastic portion 511 to produce elastic deformation, the first clamping buckle 512 is separated from the second clamping buckle to release the position lock of the pressing member 4, and the second end of the pressing member 4 can be rotated in the direction away from the reel 2, so that the pressing member 4 is rotated to the avoidance position. Preferably, the elastic portion 511 includes a first elastic plate 501, a second elastic plate 502, and an operating plate 503. The first elastic plate 501 is connected to the second end of the holding member 4 at an angle. The first elastic plate 501, the second elastic plate 502, and the operating plate 503 are connected in sequence at an angle. The first clip 512 is provided on the second elastic plate 502. When a force is applied to the operating plate 503, the second elastic plate 502 is elastically deformed relative to the first elastic plate 501, thereby separating the first and second clipping portions 51 and 52. This arrangement ensures that when no external force is applied to the elastic portion 511, the first and second clipping portions 51 can be reliably engaged with the second and second clipping portions 52, thereby reliably maintaining the holding member 4 in the holding position.

[0043] In this embodiment, if Figure 4 and Figure 5 As shown, the holding member 4 includes a base 41 and a friction portion 42. The first end of the base 41 is connected to the baffle 3. The friction portion 42 is fixed to the base 41 and extends axially along the core shaft 1. The friction coefficient of the friction portion 42 is greater than that of the base 41. The friction portion 42 is used to abut against the medium and press the medium against the roll 2. This arrangement increases the friction coefficient between the holding member 4 and the medium, thereby improving the reliability of the medium's pressure holding. Optionally, the base 41 is provided with a fixing groove 411 extending axially along the core shaft 1. The friction portion 42 is interference-engaged with the fixing groove 411 and protrudes from the fixing groove 411. Specifically, the base 41 is provided with two fixing grooves 411 at intervals. The friction portion 42 is interference-engaged with both fixing grooves 411. This arrangement improves the reliability of the connection between the friction portion 42 and the base 41. Optionally, the friction portion 42 is made of rubber material.

[0044] In this embodiment, if Figure 2As shown, the outer surface of the drum 2 is provided with an elongated groove 23 extending axially along the core shaft 1. The holding member 4 is used to hold the medium within the elongated groove 23. With this arrangement, when the medium is placed between the holding member 4 and the drum 2, the holding member 4 presses the medium within the elongated groove 23, tightening the medium between the holding member 4 and the drum 2 and improving the holding stability of the holding member 4 on the medium. Preferably, the length of the elongated groove 23 extends axially along the core shaft 1 and penetrates the drum 2 along the axial direction of the core shaft 1, so that the length of the elongated groove 23 matches the length of the drum 2, further improving the reliability of the medium's fixation.

[0045] like Figure 1 、 Figure 6 and Figure 7 As shown, the reel 2 includes a first shell 21 and a second shell 22 that are interlocked along the radial direction of the core shaft 1. The first shell 21 and the second shell 22 can simultaneously move relative to the core shaft 1 in opposite directions or towards each other along the radial direction of the core shaft 1, so that the reel 2 is in an extended form or a contracted form. The baffle 3 includes a first baffle 31 and a second baffle 32 that are interlocked. The first baffle 31 is connected to the first shell 21, and the second baffle 32 is connected to the second shell 22. At least one of the first baffle 31 and the second baffle 32 is provided with a holding part 4. The above arrangement allows the media rewind mechanism to extend the roll 2 when it needs to rewind the media. The extended roll 2 rotates with the core shaft 1, tightly wrapping the media around the outer circumference of the roll 2 to form a cylindrical shape. When the cylindrical media needs to be removed from the roll 2, the roll 2 is retracted. Since the outer dimensions of the retracted roll 2 are smaller than those of the extended roll 2 along the direction of movement between the first shell 21 and the second shell 22, the gap between the inner surface of the cylindrical media and the outer surface of the roll 2 increases, thereby reducing the clamping force between the cylindrical media and the roll 2, facilitating the removal of the media from the roll 2 and improving the efficiency of media removal. Preferably, the media rewind mechanism includes two holding members 4, which are respectively disposed on the first baffle 31 and the second baffle 32, and which respectively hold the media against the first shell 21 and the second shell 22.

[0046] In this embodiment, if Figures 6 to 8As shown, the medium rewinding mechanism also includes a support member 6, an elastic member 7 and a second locking member 8. The support member 6 is fixedly connected to the core shaft 1. The support member 6 is provided with a support surface 61. The outer diameter of the support surface 61 gradually decreases along the first direction. The first shell 21 and the second shell 22 are both sleeved with the support member 6. The first shell 21 and the second shell 22 can move relative to the core shaft 1 in the first direction or the second direction at the same time under the action of an external force. The first shell 21 includes a first conical surface 211, and the second shell 22 includes a second conical surface 221. The outer diameters of the first conical surface 211 and the second conical surface 221 gradually decrease along the first direction. The elastic member 7 is configured to keep the first conical surface 211 and the second conical surface 221 always in contact with the support member 6. The surfaces 61 abut against each other. When the first shell 21 and the second shell 22 move relative to the core shaft 1 along the second direction at the same time, the support surface 61 drives the first shell 21 and the second shell 22 to move relative to the core shaft 1 along the radial direction of the core shaft 1 opposite to each other through the first conical surface 211 and the second conical surface 221, so that the reel 2 changes to an extended form. When the first shell 21 and the second shell 22 move relative to the core shaft 1 along the first direction at the same time, the elastic member 7 drives the first shell 21 and the second shell 22 to move relative to the core shaft 1 along the radial direction of the core shaft 1 towards each other, so that the reel 2 changes to a contracted form. The second locking member 8 is used to lock the reel 2 in the extended form. The first direction and the second direction are opposite and parallel to the axial direction of the core shaft 1. The above arrangement allows for the removal of media from the roll 2 by causing the first and second shells 21, 22 to move in the first direction under the action of an external force. The elastic member 7 then drives the first and second shells 21, 22 to move simultaneously in the radial direction relative to the core shaft 1, thereby changing the roll 2 from an extended configuration to a contracted configuration. This facilitates the removal of the media from the roll 2 and improves the efficiency of media removal. Preferably, the support surface 61 is an arcuate surface, and the first and second tapered surfaces 211, 221 are tangentially engaged with the support surface 61. This reduces friction between the first and second tapered surfaces 211, 221, and the support surface 61, thereby improving the smoothness of the movement of the roll 2. Preferably, the support member 6 is spindle-shaped and includes a first support segment 64 and a second support segment 65 connected in sequence along the first direction. Along the first direction, the outer diameter of the first support segment 64 gradually increases, while the outer diameter of the second support segment 65 gradually decreases. The support surface 61 is disposed on the second support segment 65 of the support member 6. The above arrangement not only improves the overall structural strength of the support member 6 but also reduces the space occupied by the support member 6. Preferably, the support member 6 includes two protrusions 63 spaced apart along the circumference of the core shaft 1, with the support surfaces 61 distributed on the two protrusions 63. The first housing 21 is provided with a first groove (not shown in the figure), with the first tapered surface 211 serving as the bottom surface of the first groove. The second housing 22 is provided with a second groove 222, with the second tapered surface 221 serving as the bottom surface of the second groove 222. The two protrusions 63 are respectively plugged into the first groove and the second groove 222.The above arrangement enables the core shaft 1 to drive the first shell 21 and the second shell 22 to rotate synchronously when rotating, so that the reel 2 can wind the medium.

[0047] Preferably, if Figure 8 and Figure 9 As shown, the medium rewinding mechanism also includes an operating member 9 and a second elastic member 20. The operating member 9 is fixedly connected to the first shell 21 and the second shell 22 at the same time. The second locking member 8 is slidably connected to the operating member 9 and can slide relative to the operating member 9, having a locked position and an unlocked position. The second elastic member 20 is used to make the second locking member 8 always have a tendency to slide toward the locked position. One of the second locking member 8 and the support member 6 is provided with a buckle 81, and the other of the two is provided with a slot 621. When the roll 2 is in the extended form and the second locking member 8 is in the locked position, the buckle 81 is engaged with the slot 621 to lock the first shell 21 and the second shell 22 relative to the core shaft 1 along the axial direction of the core shaft 1, so that the roll 2 is locked in the extended form. When the second locking member 8 is in the unlocked position, the buckle 81 is separated from the slot 621 to release the lock 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. When the media rewind mechanism rewinds the media, the roll 2 is extended and the second locking member 8 is in the locked position. The second locking member 8 locks the roll 2 in the extended position. When the cylindrical media needs to be removed from the roll 2, the second locking member 8 is moved to the unlocked position under the action of an external force. This separates the latch 81 from the latch slot 621. The first and second housings 21 and 22 move toward each other relative to the core shaft 1 under the combined action of the media's clamping force and the elastic member 7, causing the roll 2 to shift to a retracted state, facilitating removal of the media from the roll 2. In this embodiment, the second locking member 8 is provided with the latch 81, and the support member 6 is provided with the latch slot 621. In other embodiments, the second locking member 8 is provided with the latch slot 621, and the support member 6 is provided with the latch 81.

[0048] Preferably, if Figures 6 to 8 As shown, the media rewind mechanism also includes a return spring 50 connected between the first housing 21, the second housing 22, and the support member 6. The return spring 50 is used to maintain the tendency for the first and second housings 21, 22 to move in the second direction, thereby shifting the roll 2 to an extended state. This arrangement ensures that after the media is removed from the roll 2, the first and second housings 21, 22 automatically move in the second direction under the action of the return spring 50 and simultaneously move in opposite directions radially relative to the core shaft 1, driven by the support member 6, automatically shifting the roll 2 to an extended state without requiring additional operation.

[0049] Preferably, if Figures 6 to 9As shown, the operating member 9 is provided with a mounting cavity 91 and a guide groove 92 communicating with the mounting cavity 91. The support member 6 further includes a guide post 62 coaxially sleeved with the core shaft 1. A snap-in groove 621 is provided in the guide post 62. The guide groove 92 sleeves with the guide post 62 and can slide along the guide post 62. When the reel 2 is in the extended state and the second locking member 8 is in the locked position, the snap-in groove 621 extends through the guide groove 92 into the mounting cavity 91 and engages with the buckle 81. Preferably, the cross-section of the guide post 62 is H-shaped or D-shaped, and the shape and size of the guide groove 92 and the guide post 62 are adapted. The cooperation between the guide groove 92 and the guide post 62 further limits the rotation of the operating member 9, the first housing 21, and the second housing 22 relative to the core shaft 1 along the circumferential direction of the core shaft 1.

[0050] This embodiment further provides a printer comprising a frame and the aforementioned media rewind mechanism, the media rewind mechanism being disposed on the frame and configured to rewind used ribbon. The printer provided in this embodiment utilizes the aforementioned media rewind mechanism, facilitating simplified operation, improving ribbon installation efficiency, and ensuring more regular ribbon winding.

[0051] Preferably, one end of the core shaft 1 of the media rewind mechanism is supported by the frame, and the other end is suspended. Preferably, the printer further comprises a paper roll support mechanism, a printing mechanism, and a ribbon dispensing mechanism. The paper roll support mechanism is used to support the printing paper roll. The printing mechanism is disposed downstream of the paper roll support mechanism along the paper feed direction and is used to print on the printing paper. The ribbon dispensing mechanism is used to support an unused ribbon roll.

[0052] Example 2

[0053] Figure 10 This is a structural diagram of the medium rewinding mechanism provided in the second embodiment of the present invention. Figure 11 This is a partial structural exploded view of the medium rewinding mechanism provided in the second embodiment of the present invention. Figure 10 and Figure 11 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:

[0054] The holding member 4 is made of an elastic material. Its first end is fixedly connected to the baffle 3, while its second end is suspended. Along the radial direction of the core shaft 1, the holding member 4 and the spool 2 are positioned opposite each other, forming a gap between them for holding the media. In this embodiment, when installing the media into the media rewind mechanism, the second end of the holding member 4 is first grasped to elastically deform the holding member 4 away from the spool 2, thereby widening the gap between the holding member 4 and the spool 2 and positioning the media therebetween. After the external force applied to the holding member 4 disappears, the holding member 4, under its own elastic force, approaches the spool 2 and presses the media against it. This simple structure is easy to implement.

[0055] Preferably, the baffle 3 includes a limiting surface 33 and an escape groove 34 extending through the limiting surface 33. The limiting surface 33 is used to limit the axial position of the medium wound on the reel 2 along the core shaft 1. The holding member 4 includes a first plate 43 and a second plate 44 connected at an angle. The first plate 43 is located on the side of the baffle 3 facing away from the limiting surface 33 and is connected to the baffle 3 via a fastener 40. The second plate 44 is connected to the first plate 43 at an angle and extends through the escape groove 34 to face the outer wall of the reel 2, thereby pressing the medium against the reel 2. This arrangement ensures that the holding position of the holding member 4 and the baffle 3 does not interfere with the winding of the medium.

[0056] Preferably, the baffle 3 further includes a third plate 45 connected to the second plate 44 at an angle. The third plate 45 extends from the second plate 44 in a direction away from the reel 2 for operation by an operator.

[0057] 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 baffle (3) and a holding member (4), wherein the core shaft (1) is configured to be able to rotate around its own axis, the reel (2) is sleeved on the core shaft (1) and can rotate synchronously with the core shaft (1), the reel (2) is used to wind the medium, and along the axial direction of the core shaft (1), the baffle (3) is connected to one end of the reel (2) and is used to limit the axial position of the medium wound on the reel (2) along the core shaft (1); the first end of the holding member (4) is connected to the baffle (3), the length of the holding member (4) extends along the axial direction of the core shaft (1), and the holding member (4) is used to press the medium on the reel (2).

2. The medium rewinding mechanism according to claim 1, characterized in that: The first end of the pressing member (4) is movably connected to the baffle (3), and the pressing member (4) has an avoidance position and a pressing position when moving relative to the baffle (3). When the pressing member (4) is located at the avoidance position, an operating space for installing the medium is formed between the pressing member (4) and the reel (2). When the pressing member (4) is located at the pressing position, the pressing member (4) and the reel (2) are arranged opposite to each other along the radial direction of the core shaft (1), and a gap for clamping the medium can be formed between the two.

3. The medium rewinding mechanism according to claim 2, characterized in that: The first end of the pressing member (4) is pivotally connected to the baffle (3), and the pressing member (4) can rotate relative to the baffle (3) around the pivot axis so that the pressing member (4) is located at the pressing position or the avoidance position; the medium rewinding mechanism also includes a first locking member (5), which is used to lock the pressing member (4) at the pressing position.

4. The medium rewinding mechanism according to claim 3, characterized in that: The first locking member (5) comprises a first clamping portion (51) provided at the second end of the pressing member (4) and a second clamping portion (52) provided on the reel (2); the first clamping portion (51) can be engaged with or separated from the second clamping portion (52); and when the first clamping portion (51) is engaged with the second clamping portion (52), the first locking member (5) locks the pressing member (4) in the pressing position; Alternatively, the first locking member (5) includes a magnetic member and an attracting member, the magnetic member is arranged at one of the second end of the holding member (4) and the reel (2), and the attracting member is arranged at the other of the two, the attracting member can be attracted to or separated from the magnetic member, and when the attracting member is attracted to the magnetic member, the first locking member (5) locks the holding member (4) in the holding position.

5. The medium rewinding mechanism according to claim 1, characterized in that: The pressing member (4) is made of elastic material, the first end of the pressing member (4) is fixedly connected to the baffle (3), the second end of the pressing member (4) is suspended, and along the radial direction of the core shaft (1), the pressing member (4) and the reel (2) are arranged opposite to each other and a gap for clamping the medium can be formed between the two.

6. The medium rewinding mechanism according to any one of claims 1 to 5, characterized in that: The holding member (4) includes a base frame (41) and a friction portion (42), wherein the first end of the base frame (41) is connected to the baffle (3), the friction portion (42) is fixedly arranged on the base frame (41) and extends along the axial direction of the core shaft (1), and the friction coefficient of the friction portion (42) is greater than the friction coefficient of the base frame (41), and the friction portion (42) is used to abut against the medium and press the medium against the roll (2).

7. The medium rewinding mechanism according to any one of claims 1 to 5, characterized in that: The outer surface of the reel (2) is provided with a long groove (23) extending along the axial direction of the core shaft (1), and the holding member (4) is used to hold the medium in the long groove (23).

8. The medium rewinding mechanism according to any one of claims 1 to 5, characterized in that: The reel (2) comprises a first shell (21) and a second shell (22) which are interlocked along the radial direction of the core shaft (1), and the first shell (21) and the second shell (22) can simultaneously move relative to the core shaft (1) in opposite directions or in opposite directions along the radial direction of the core shaft (1), so that the reel (2) is in an extended form or a contracted form; the baffle (3) comprises a first baffle (31) and a second baffle (32) which are interlocked, the first baffle (31) is connected to the first shell (21), and the second baffle (32) is connected to the second shell (22), and at least one of the first baffle (31) and the second baffle (32) is provided with the holding member (4).

9. The medium rewinding mechanism according to claim 8, characterized in that: The medium rewinding mechanism further comprises a support member (6), an elastic member (7) and a second locking member (8), wherein the support member (6) is fixedly connected to the core shaft (1), and the support member (6) is provided with a support surface (61), and the outer diameter of the support surface (61) gradually decreases along the first direction; The first shell (21) and the second shell (22) are both sleeved with the support member (6); the first shell (21) and the second shell (22) can simultaneously move relative to the core shaft (1) along the first direction or the second direction under the action of an external force; the first shell (21) includes a first conical surface (211); the second shell (22) includes a second conical surface (221); the outer diameters of the first conical surface (211) and the outer diameters of the second conical surface (221) both gradually decrease along the first direction; The elastic member (7) is configured to make the first conical surface (211) and the second conical surface (221) always abut against the support surface (61); when the first shell (21) and the second shell (22) move relative to the core shaft (1) along the second direction at the same time, the support surface (61) drives the first shell (21) and the second shell (22) to move relative to the core shaft (1) along the radial direction of the core shaft (1) through the first conical surface (211) and the second conical surface (221), so that the reel (2) changes to the extended form; when the first shell (21) and the second shell (22) move relative to the core shaft (1) along the first direction at the same time, the elastic member (7) drives the first shell (21) and the second shell (22) to move relative to the core shaft (1) along the radial direction of the core shaft (1) at the same time, so that the reel (2) changes to the contracted form; The second locking member (8) is used to lock the reel (2) in the extended state; wherein the first direction and the second direction are opposite and both are parallel to the axial direction of the core shaft (1).

10. A printer, characterized in that: The device comprises a frame and the 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.

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