A transmission device for a printer and a printer.

Abstract

This invention provides a transmission device for a printer, relating to the field of printing device technology. It includes a transmission assembly, a supply assembly driven by the transmission assembly for supplying the ribbon, and a take-up assembly for winding the ribbon delivered from the supply assembly. It also includes a reversing mechanism that selectively transmits power from the transmission assembly to either the supply assembly or the take-up assembly, causing the ribbon to retract in the opposite direction or be conveyed in the forward direction accordingly. The reversing mechanism can selectively transmit power from the transmission assembly to either the ribbon supply end or the take-up end, allowing the power of the transmission assembly to selectively drive rotation at either end. This ensures that the ribbon is supplied or retracted only by the supply end or the take-up end to adjust its position, guaranteeing synchronous ribbon delivery at both ends, keeping the ribbon taut, preventing ribbon wrinkles, ensuring a smooth printing process, and improving print quality. This application also provides a printer.

Description

Technical Field

[0001] This invention relates to the field of printing device technology, and more specifically, to a transmission device for a printer and a printer. Background Technology

[0002] The working principle of the ribbon in a thermal transfer printer is as follows: the ribbon moves forward along with the labels and other consumables, and is collected by the ribbon recycling end. Due to the diversity of label sizes (label size and the gap between labels), and the requirement to optimize the position of printed content on the label (avoiding waste caused by blank spaces), the label paper must be repositioned before printing the next new label. At this time, the paper must be rolled back in the opposite direction along with the ribbon to avoid ribbon waste or ribbon wrinkling.

[0003] In existing technologies, a mechanism similar to a one-way bearing is typically installed at both the ribbon supply and recycling ends. However, to ensure the tight fit and lifespan requirements of commercially available one-way bearings and ribbon chucks, the one-way bearing and ribbon chuck usually need to be molded as a single piece of plastic, resulting in limitations such as higher costs and greater manufacturing difficulties.

[0004] For example, the "Ribbon Return Device for Thermal Transfer Printers" disclosed in Chinese Patent CN203651220U uses gears at the ribbon return end, with equal-ratio gear sets between the gears at both ends and the output shaft gear of the stepper motor. Under the same power source and equal transmission ratio, this achieves the same linear speed and synchronized operation of the gears at both ends, resulting in smoother ribbon movement during printing, reduced ribbon wrinkling, and improved print quality. However, this method requires extremely high precision in gear meshing and transmission, presenting significant challenges in manufacturing and maintenance. Furthermore, wear and tear between gears or other factors can easily lead to uneven transmission, causing a significant difference in rotational speed between the ribbon supply and return ends, resulting in uneven ribbon transmission and affecting print quality. Furthermore, the linear speed of the supply end gear and the return end gear of the ribbon are the same and their movements are synchronized. However, it cannot always be guaranteed that the ribbons at both ends will have the same transmission speed. This is because the outer diameter of the ribbon at both ends is constantly changing due to the supply and return of the ribbon during the printing process. Even if the ribbons at the supply end and the return end are driven by the same rotation speed, they will still have different transmission speeds. Summary of the Invention

[0005] This invention discloses a transmission device and printer for a printer, aiming to improve the problems of high cost and manufacturing difficulty caused by the use of a one-way bearing structure in existing printer transmission devices to achieve synchronous forward or reverse retraction of printing material and ribbon.

[0006] The present invention adopts the following solution:

[0007] A printer drive mechanism includes a drive assembly, a supply assembly driven by the drive assembly for supplying a ribbon, and a take-up assembly for winding up the ribbon delivered from the end of the supply assembly; it also includes a reversing mechanism that selectively transmits power from the drive assembly to either the supply assembly or the take-up assembly, so that the ribbon is correspondingly reversed or forward-conveyed.

[0008] As a further improvement, the transmission assembly includes a drive motor, a first gear set that transmits power to the supply assembly, and a second gear set that transmits power to the take-up assembly. The drive motor transmits power to both the first and second gear sets simultaneously through the drive gears.

[0009] As a further improvement, a third gear set is also included for transmitting power from the drive motor to the printing roller, the third gear set being driven to rotate by the drive gear.

[0010] As a further improvement, the reversing mechanism includes a reversing gear and a rocker arm, the reversing gear being mounted on the rocker arm, and the rocker arm driving the reversing gear to swing to transmit the power from the transmission assembly.

[0011] As a further improvement, the reversing mechanism includes a first reversing component for connecting or disconnecting the supply component and a second reversing component for connecting or disconnecting the take-up component.

[0012] As a further improvement, the first gear set is driven to the reversing gear of the first reversing assembly, and the second gear set is driven to the reversing gear of the second reversing assembly; and the first gear set and the second gear set rotate relative to each other under the drive of the driving gear.

[0013] As a further improvement, when the drive motor drives the drive gear to rotate forward, the first reversing component is connected to the supply component, and the second reversing component is relatively disengaged from the take-up component; when the drive motor drives the drive gear to rotate in reverse, the second reversing component is connected to the take-up component, and the first reversing component is relatively disengaged from the supply component.

[0014] As a further improvement, a limiting mechanism is also included, which limits the position of the first reversing assembly and the second reversing assembly after they are disengaged from their respective supply and take-up assemblies.

[0015] As a further improvement, the limiting mechanism includes a limiting post, which is arranged correspondingly to the reversing mechanism to prevent the swing arms of the first reversing component and the second reversing component from continuously moving in the direction of disengaging from the supply component and the winding component, thereby causing each reversing gear to be positioned relative to the side away from the supply component or the winding component.

[0016] This application also provides a printer, including a printer body, a printing roller disposed on the printer body, and the aforementioned transmission device, wherein the printing roller is driven to rotate by the transmission device to convey the material to be printed forward or backward.

[0017] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0018] The transmission device of the printer disclosed in this application allows the ribbon supply component and the rewind component to selectively transmit power from the transmission component to either the ribbon supply end or the rewind end via a reversing mechanism. This allows the power of the transmission component to selectively drive one of the two ends to rotate, thereby ensuring that the ribbon is supplied or retracted solely by either the supply end or the rewind end to adjust its position. This ensures that the ribbon is always transported synchronously at both ends, keeping it taut at all times. This avoids problems such as ribbon wrinkles, tangling, and jamming, guaranteeing a smooth printing process and improving print quality. Furthermore, the device has a simple structure, is easy to install and manufacture, and effectively reduces costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the transmission device of Embodiment 1 of the present invention from a first perspective;

[0021] Figure 2 This is a schematic diagram of the transmission device of Embodiment 1 of the present invention from a second perspective, wherein the transmission component is driven to the supply component by the first reversing component, and the arrow in the figure indicates the movement of the reversing component;

[0022] Figure 3 yes Figure 2 A schematic diagram of the structure of the central drive assembly driving the winding assembly under the drive of the second reversing assembly;

[0023] Figure 4 This is a schematic diagram of the transmission device of Embodiment 1 of the present invention from a third-person perspective;

[0024] Figure 5 yes Figure 4 A magnified view of a section at point I;

[0025] Figure 6This is a structural schematic diagram of the transmission device of Embodiment 1 of the present invention from a fourth perspective, wherein the first reversing component of the reversing mechanism is shown to be disassembled relative to each other.

[0026] Figure 7 This is a schematic diagram of the transmission device of Embodiment 1 of the present invention from a fifth perspective;

[0027] Figure 8 This is a schematic diagram of the transmission device of Embodiment 1 of the present invention from a sixth perspective;

[0028] Figure 9 This is a schematic diagram of the transmission device of Embodiment 1 of the present invention from other perspectives. In this case, the third gear set is hidden for easy illustration. The transmission component is driven by the first reversing component to the supply component.

[0029] Figure 10 yes Figure 9 A schematic diagram of the structure of the central drive assembly that is driven by the second reversing assembly to the take-up assembly;

[0030] Figure 11 This is a cross-sectional view of the printer according to Embodiment 2 of the present invention;

[0031] Figure 12 This is a schematic diagram of the printer structure of Embodiment 2 of the present invention.

[0032] Icons: 1-Transmission assembly; 11-Drive motor; 12-Drive gear; 13-First gear set; 131-First rotating tooth; 132-Rotating shaft; 14-Second gear set; 141-Second rotating tooth; 15-Third gear set; 2-Supply assembly; 3-Rewind assembly; 4-Reversing mechanism; 4A-First reversing assembly; 4B-Second reversing assembly; 41-Reversing gear; 42-Swing arm; 5-Limiting post; 6-Spring component; 7-Printer body; 8-Printing roller; 9-Dust cover. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Example

[0039] Combination Figures 1 to 3 This embodiment provides a transmission device for a printer, including a transmission component 1, a supply component 2 driven by the transmission component 1 and used for supplying carbon ribbon, a winding component 3 for winding up the carbon ribbon transmitted from the end of the supply component 2, and a reversing mechanism 4.

[0040] Furthermore, the reversing mechanism 4 selectively transmits the power of the transmission component 1 to either the supply component 2 or the take-up component 3, so that the ribbon retracts in the opposite direction or is transported in the forward direction accordingly. The ribbon is mounted on a reel at the supply component 2 and the take-up component 3, respectively. This allows the ribbon to be transported in the printing direction by the rotation of the reel to supply the printing material for printing, and in the opposite direction to synchronize with the printing material to adjust the printing position. The reversing mechanism 4 can selectively transmit the power of the transmission component 1 to either the supply or take-up end of the ribbon, ensuring that the ribbon is supplied (forward movement) or retracted (backward movement) for position adjustment only by the supply or take-up end. This ensures that the ribbon is always transported synchronously at both ends, keeping it taut and preventing defects such as ribbon wrinkles, tangling, and jamming, thus guaranteeing a smooth printing process and improving print quality.

[0041] It should be noted that the supply component 2 and the take-up component 3 are interconnected via a ribbon. When the reversing mechanism 4 selectively transmits power from the transmission component 1 to the supply component 2, the supply component 2 feeds the ribbon in the opposite direction of printing to adjust its position. At this time, the relatively rotating supply component 2 drives the take-up component 3 to rotate synchronously via the ribbon. Similarly, when the reversing mechanism 4 selectively transmits power from the transmission component 1 to the take-up component 3, the take-up component 3 feeds the ribbon in the printing direction to supply the printing material to the printing area. At this time, the relatively rotating take-up component 3 drives the supply component 2 to rotate synchronously via the ribbon. The transmission device in this invention has a simple structure and is easy to install, manufacture, and use.

[0042] In this embodiment, the transmission assembly 1 includes a drive motor 11, a first gear set 13 that transmits power to the supply assembly 2, a second gear set 14 that transmits power to the take-up assembly 3, and a third gear set 15 that transmits power from the drive motor 11 to the printing roller 8. The drive motor 11 transmits power to both the first gear set 13 and the second gear set 14 via the drive gear 12. It should be noted that the transmission connection between the drive motor 11 and the drive gear 12 can be via gears, belts, chains, or other transmission methods, thereby transmitting the forward and reverse driving force of the drive motor 11 to the drive gear 12, correspondingly controlling the forward and reverse rotation of the drive gear 12. The third gear set 15 is driven to rotate by the drive gear 12. The drive motor 11 transmits power to the drive gear 12, thereby controlling the forward and reverse rotation of the drive gear 12, and transmitting this power to the printing roller 8 to synchronously drive the printing roller 8 to convey printing consumables along the printing direction or to convey them in the reverse direction to adjust the printing position of the printing material.

[0043] Please see Figures 3 to 8The reversing mechanism 4 includes a reversing gear 41 and a rocker arm 42. The reversing gear 41 is mounted on the rocker arm 42, which drives the reversing gear 41 to swing and transmit power from the transmission assembly 1. The transmission assembly 1 is connected to the reversing gear 41, and the swing of the rocker arm 42 controls the reversing gear 41 to move closer to the supply assembly 2 or the take-up assembly 3 for transmission or to move further away from each other to disengage. The reversing gear 41 is controllably connected to one of the supply assembly 2 or the take-up assembly 3, thereby transmitting the power of the transmission assembly 1 to the corresponding supply assembly 2 or take-up assembly 3 through the reversing gear 41. This ensures that the power is transmitted to one end of the carbon ribbon supply or take-up assembly, selectively driving one of the two ends to rotate, thus ensuring that the transmission of the carbon ribbon is achieved by driving only one of the supply or take-up ends.

[0044] In this embodiment, preferably, the reversing mechanism 4 includes a first reversing component 4A for connecting to or disconnecting from the supply component 2 and a second reversing component 4B for connecting to or disconnecting from the take-up component 3. Both the first reversing component 4A and the second reversing component 4B include a reversing gear 41 and a rocker arm 42. A first gear set 13 is driven to the reversing gear 41 of the first reversing component 4A, and a second gear set 14 is driven to the reversing gear 41 of the second reversing component 4B. The first gear set 13 and the second gear set 14 rotate relative to each other under the drive of the drive gear 12. When the drive motor 11 drives the drive gear 12 to rotate in the forward direction, the first reversing component 4A is driven to the supply component 2, and the second reversing component 4B is relatively disconnected from the take-up component 3. When the drive motor 11 drives the drive gear 12 to rotate in the reverse direction, the second reversing component 4B is driven to the take-up component 3, and the first reversing component 4A is relatively disconnected from the supply component 2. Correspondingly, to allow the ribbon to retract in the reverse direction for position adjustment (at this time, the printing roller 8 adjusts the printing material in the opposite direction of printing), the drive motor 11 drives the drive gear 12 to rotate in the forward direction. The first reversing component 4A is connected to the supply component 2 to transmit power to the supply component 2. To allow the ribbon to be fed in the forward direction (at this time, the printing roller 8 feeds the printing material in the printing direction), the drive motor 11 drives the drive gear 12 to rotate in the reverse direction. The second reversing component 4B is connected to the take-up component 3 to transmit power to the take-up component 3.

[0045] Please see Figures 6 to 10To enable the drive gear 12 to rotate in both directions, the ribbon is supplied synchronously and the printing material is conveyed along the printing direction, or the ribbon is retracted synchronously and the printing material is conveyed in the opposite direction to adjust the printing position. In this embodiment, the supply component 2 and the take-up component 3 are located on the left and right sides of the transmission component 1, respectively. The first gear set 13 and the second gear set 14 are meshed on the left and right sides of the drive gear 12, respectively, and the third gear set 15 is meshed on the upper side of the drive gear 12, thereby allowing the gear sets to rotate relative to each other. It should be noted that in this embodiment, the first gear set 13, the second gear set 14, and the third gear set 15 are all driven by the drive gear 12, sharing the same drive source. The drive gear 12 rotates in both directions, and the reversing mechanism 4 guides the power of the drive gear 12 to the supply component 2 or the take-up component 3, respectively. Only one of them is controlled by the drive gear 12, while the other is connected and linked relative to the other via the ribbon. Thus, when one end of the two components is driven, they rotate synchronously to smoothly transmit the ribbon. In this configuration, the drive gear 12 rotates relatively forward, triggering the first reversing component 4A. This causes the drive gear 12 to transmit power only to the supply component 2 via the first gear set 13, resulting in the supply component 2 rotating relatively backward to retract the ribbon in the opposite printing direction. At this time, the drive gear 12 is transmitted to the printing roller 8 via the third gear set 15, causing the printing roller 8 to transport and adjust the printing material in the opposite printing direction, thus adjusting the printing position. Conversely, the reverse rotation of the drive gear 12 triggers the second reversing component 4B, causing the drive gear 12 to transmit power only to the take-up component 3 via the second gear set 14. This causes the take-up component 3 to rotate relatively forward, pulling the ribbon in the printing direction to supply the ribbon. At this time, the drive gear 12 is transmitted to the printing roller 8 via the third gear set 15, causing the printing roller 8 to transport the printing material in the printing direction, thus performing the printing operation.

[0046] Furthermore, the first gear set 13 includes a first rotating tooth 131, and the second gear set 14 includes a second rotating tooth 141. The first rotating tooth 131 and the second rotating tooth 141 are respectively meshed on the left and right sides of the drive gear 12. The first reversing assembly 4A is linked to the first rotating tooth 131. A rocker arm 42 of the first reversing assembly 4A is rotatably mounted on the shaft 132 where the first rotating tooth 131 is located. The reversing gear 41 mounted on the rocker arm 42 meshes with the first rotating tooth 131. Thus, under the meshing rotation of the rocker arm 42 with the first rotating tooth 131 and the reversing gear 41, the radial force generated by the gear meshing causes the rocker arm to drive the reversing gear 41 to move relative to the periphery of the first rotating tooth 131 until the reversing gear 41 moves to the connection with the supply assembly 2, thereby completing the power transmission. Correspondingly, the second reversing component 4B located on the other side is linked with the second rotating gear 141 to realize reversing and complete power transmission in the same way as described above, and will not be repeated here.

[0047] Specifically, to facilitate the reversing mechanism 4 selectively transmitting power from the transmission assembly 1 to either the supply assembly 2 or the take-up assembly 3, in this embodiment, driven by the rotation of the same drive gear 12, the first rotating tooth 131 and the second rotating tooth 141 respectively achieve non-interference and provide power transmission to either the end of the take-up assembly 3 or the end of the supply assembly 2 in different rotation directions. At the same time, a rotation direction (forward or reverse rotation of the drive gear 12) only causes rotation at one of the positions of the supply assembly 2 or the take-up assembly 3.

[0048] The drive gear 12 rotates to control the meshing of the first rotating teeth 131 and the second rotating teeth 141 on both sides, causing the reversing gears 41 at their respective positions to move in the same direction along the periphery of each rotating tooth. Furthermore, when the reversing gear 41 at the first rotating tooth 131 moves ( Figure 2 and Figure 9 (in the direction of the middle arrow) to be connected to the supply component 2 for transmission. At this time, the reversing gear 41 at the second rotating tooth 141 moves to the point where it disengages from the take-up component 3 and is relatively limited at this position, thereby restricting the reversing gear 41 at the disengagement point from continuously moving around the periphery of the second rotating tooth 141, avoiding interference with the meshing transmission of other gear sets or moving to reconnect with the take-up component 3 for transmission. Correspondingly, when the reversing gear 41 at the second rotating tooth 141 moves ( Figure 3 and Figure 10 (In the direction of the middle arrow) it is connected to the winding assembly 3 for transmission. At this time, the reversing gear 41 corresponding to the first rotating tooth 131 moves to the point where it is disengaged from the supply assembly 2 and is relatively limited at this position, thereby restricting the reversing gear 41 at the disengaged point from continuously moving around the periphery of the first rotating tooth 131, avoiding interference with the meshing transmission of other gear sets or moving to reconnect with the supply assembly 2 for transmission.

[0049] It should be noted that, for ease of explanation, the forward rotation of each gear is defined as clockwise rotation, and the reverse rotation as counterclockwise rotation. Specifically, when the drive gear 12 rotates forward, the first tooth 131 and the second tooth 141 both rotate in the opposite direction. Correspondingly, the reversing gears 41 located on the first tooth 131 and the second tooth 141 both rotate forward. Thus, under the radial force of the gear meshing, the rocker arm 42 drives the reversing gears 41 to swing synchronously to the left, thereby transmitting power only to the supply assembly 2 located on the left. When the drive gear 12 rotates in the opposite direction, the first tooth 131 and the second tooth 141 both rotate forward. Correspondingly, the reversing gears 41 located on the first tooth 131 and the second tooth 141 both rotate in the opposite direction. Thus, under the radial force of the gear meshing, the rocker arm 42 drives the reversing gears 41 to swing synchronously to the right, thereby transmitting power only to the winding assembly 3 located on the right.

[0050] Specifically, this is achieved by moving the reversing gear 41 to the disengagement point and limiting its relative position there. In this embodiment, a limiting mechanism (not shown) is also included. The limiting mechanism restricts the position of the first reversing component 4A and the second reversing component 4B after disengaging from their respective supply component 2 and take-up component 3. The limiting mechanism includes limiting posts 5, which are correspondingly arranged with the reversing mechanism 4 to prevent the swing arms 42 of the first reversing component 4A and the second reversing component 4B from continuously moving in the direction of disengagement from the supply component 2 and take-up component 3, thereby placing each reversing gear 41 on the side away from the supply component 2 or take-up component 3. Each swing arm 42 is correspondingly fitted with a limiting post 5, and the limiting post 5 is located on the path of the swing arm 42 along the side of disengagement from the transmission, thereby abutting the swing arm 42 to limit its continuous movement. The two limiting posts 5 are arranged at a relative interval to avoid interference and other problems caused by excessive swing paths of each swing arm 42. It should be noted that during the transmission process, all gears mesh with each other to avoid jamming and damage.

[0051] Please see Figure 4 , Figure 5 and Figure 6 Preferably, the meshing plane of the drive gear 12 and the first rotating teeth 131 and the second rotating teeth 141 is located on a different meshing plane than the meshing plane of the first rotating teeth 131, the second rotating teeth 141 and their respective reversing gears 41. The first rotating teeth 131 and the second rotating teeth 141 each have different meshing surfaces arranged coaxially, so that they mesh with the drive gear 12 and the reversing gears 41 respectively on different meshing planes, further ensuring the meshing transmission between the gears. In this embodiment, the transmission connection between the supply assembly 2, the winding assembly 3 and their respective reversing gears 41 is preferably a gear meshing method. Each reversing gear 41 is elastically abutted against its respective meshing plane by a spring member 6. The spring member 6 is compressed between the reversing gear 41 and the rocker arm 42, with one end abutting against the end face of the reversing gear 41 and the other end abutting against the end face of the rocker arm 42. Furthermore, the reversing gear 41 at the supply component 2 is on the same meshing plane as the supply component 2, and the reversing gear 41 at the winding component 3 is on the same meshing plane as the winding component 3.

[0052] Combination Figure 8 , Figure 11 and Figure 12 This application also provides a printer, including a printer body 7, a printing roller 8 disposed on the printer body 7, and a transmission device. The printing roller 8 is driven to rotate by the transmission assembly 1 to convey the printed material forward or backward. The conveying of the printing roller 8 is linked with the conveying of the ribbon, thereby ensuring that when the ribbon is supplied, the printing roller 8 conveys the printing consumables in the printing direction (the printing material is conveyed forward), or when the ribbon is retracted, the printing roller 8 conveys and adjusts the printing position of the printing material in the opposite printing direction (the printing material is conveyed backward).

[0053] The transmission device is located on one side of the printer body 7, and the limiting post 5 is positioned opposite to the side wall of the printer body 7 to restrict the continuous movement of each swing arm 42 away from the supply assembly 2 or the take-up assembly 3. Preferably, a dust cover 9 is provided on the side of the printer body 7 where the transmission device is located to cover the transmission device and prevent external dust and other debris from interfering with its transmission, thereby hiding and protecting the transmission device.

[0054] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A transmission device for a printer, comprising a transmission assembly, a supply assembly driven by the transmission assembly for supplying a ribbon, and a take-up assembly for winding the ribbon delivered from the end of the supply assembly, characterized in that, It also includes a reversing mechanism that selectively transmits power from the transmission assembly to either the supply assembly or the take-up assembly, causing the carbon ribbon to retract in the reverse direction or be conveyed in the forward direction accordingly. The transmission assembly includes a drive motor, a first gear set that transmits power to the supply assembly, and a second gear set that transmits power to the take-up assembly. The drive motor transmits power to both the first and second gear sets simultaneously via a drive gear. The reversing mechanism includes a first reversing component for connecting to or disconnecting from the supply assembly and a second reversing component for connecting to or disconnecting from the take-up assembly. The first gear set is driven by a reversing gear of the first reversing component, and the second gear set is driven by a reversing gear of the second reversing component. The first and second gear sets rotate relative to each other under the drive of the drive gear. It also includes a limiting mechanism that restricts the positions of the first and second reversing components after they are disconnected from their respective supply and take-up assemblies.

2. The transmission device according to claim 1, characterized in that, It also includes a third gear set that transmits power from the drive motor to the printing roller, and the third gear set is driven to rotate by the drive gear.

3. The transmission device according to claim 2, characterized in that, The reversing mechanism includes a reversing gear and a rocker arm. The reversing gear is mounted on the rocker arm, and the rocker arm drives the reversing gear to swing to transmit the power from the transmission assembly.

4. The transmission device according to claim 1, characterized in that, When the drive motor drives the drive gear to rotate forward, the first reversing component is driven to the supply component, and the second reversing component is relatively disengaged from the take-up component; when the drive motor drives the drive gear to rotate in reverse, the second reversing component is driven to the take-up component, and the first reversing component is relatively disengaged from the supply component.

5. The transmission device according to claim 1, characterized in that, The limiting mechanism includes a limiting post, which is arranged correspondingly to the reversing mechanism to prevent the swing arms of the first reversing component and the second reversing component from moving continuously in the direction away from the supply component and the winding component, so that each reversing gear is positioned on the side away from the supply component or the winding component.

6. A printer, characterized in that, The printer includes a printer body, a printing roller disposed on the printer body, and a transmission device as described in any one of claims 1 to 5, wherein the printing roller is driven to rotate by the transmission assembly to convey the material to be printed forward or backward.

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