Transmission mechanism of printer and thermal transfer printer

Abstract

The utility model provides a transmission mechanism of a printer and a thermal transfer printer, and belongs to the technical field of printing equipment. The transmission mechanism of the printer comprises a driving assembly and two one-way driving shaft assemblies. Each one-way driving shaft assembly comprises a thermal transfer ribbon shaft and a clutch assembly which is in transmission connection with the driving assembly and the thermal transfer ribbon shaft; the driving assembly drives the thermal transfer ribbon shafts to rotate in one direction through the clutch assembly, and the rotation directions of the two thermal transfer ribbon shafts are opposite. When the driving assembly rotates in one direction, one clutch assembly is connected with the corresponding thermal transfer ribbon shaft and drives the thermal transfer ribbon shaft to rotate, and the other clutch assembly is separated from the other thermal transfer ribbon shaft. The one-way driving characteristic ensures that a user can return the thermal transfer ribbon easily through the reversing driving assembly, position adjustment or unused thermal transfer ribbon rewinding is facilitated, waste of the thermal transfer ribbon is avoided, the utilization rate of the thermal transfer ribbon is improved, and flexibility and practicability are enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to printing equipment technical field, especially a kind of transmission mechanism and thermal transfer printer of printer. BACKGROUND

[0002] In printing equipment, especially thermal transfer printer, carbon tape is a kind of commonly used consumables, and the role of carbon tape is to transfer ink to printing medium in printing process. However, carbon tape can only advance and cannot retreat, resulting in waste of carbon tape. How to efficiently realize the retreat of carbon tape while ensuring the continuity and stability of printing has become a problem to be solved. UTILITY MODEL CONTENT

[0003] In view of the above problems, the utility model provides a transmission mechanism of printer allowing the reverse drive assembly to realize the carbon tape return function and a thermal transfer printer.

[0004] In the first aspect, a transmission mechanism of printer is provided, comprising: a drive assembly and two one-way drive shaft assemblies.

[0005] Each one-way drive shaft assembly comprises a carbon tape shaft and a clutch assembly connected to the drive assembly and the carbon tape shaft.

[0006] The drive assembly drives the carbon tape shaft to rotate in one direction through the clutch assembly, and the rotation directions of the two carbon tape shafts are opposite.

[0007] When the drive assembly rotates in one direction, one of the clutch assemblies engages with the corresponding carbon tape shaft and drives the carbon tape shaft to rotate, and the other clutch assembly disengages from the other carbon tape shaft.

[0008] Further, the clutch assembly comprises a reset structure and a ratchet and pawl that engage with each other.

[0009] The directions of the ratchet teeth of the two ratchets in the two clutch assemblies are opposite.

[0010] The reset structure is arranged on the side of the ratchet away from the pawl.

[0011] The ratchet is drivingly connected to the drive assembly, and the pawl is drivingly connected to the carbon tape shaft.

[0012] The drive assembly drives the carbon tape shaft to rotate through the cooperation of the ratchet and the pawl.

[0013] Further, each ratchet tooth of each ratchet has two edges adjacent to each other, which are a vertical edge and an inclined edge respectively, and the directions of the corresponding inclined edges of the two ratchets are opposite.

[0014] Further, the reset structure is a spring, one end of the spring is in abutment with an abutment structure of the printer, and the other end is in abutment with a side of the ratchet wheel away from the pawl.

[0015] Further, the clutch assembly further comprises a shaft sleeve sleeved on the carbon tape shaft, and the pawl is arranged on the shaft sleeve.

[0016] Further, the clutch assembly further comprises a fixed shaft, and the shaft sleeve and the carbon tape shaft are arranged on the fixed shaft.

[0017] Further, the limiting structure is a flange arranged on the periphery of the fixed shaft.

[0018] Further, the drive assembly comprises a drive motor and a gear set, and the gear set comprises an input gear and two output gears.

[0019] The output end of the drive motor is coaxially and fixedly connected with the input gear in the gear set.

[0020] The two output gears are respectively drivingly connected with the two clutch assemblies.

[0021] Further, the side surface of the ratchet wheel is provided with a meshing tooth, and the meshing tooth is in meshing engagement with the output gear.

[0022] In a second aspect, a thermal transfer printer is provided, comprising the transmission mechanism of the printer according to the above technical solution.

[0023] The embodiments of the utility model have the following advantages or beneficial effects:

[0024] The drive assembly selectively drives one carbon tape shaft to rotate through the two clutch assemblies, drives one carbon tape shaft (i.e. a recycling shaft) to rotate in a first direction, realizes normal printing, drives another carbon tape shaft (i.e. a dispensing shaft) to rotate in a second direction, and realizes the rewinding of the carbon tape. The one-way driving feature ensures that the carbon tape can only be rewound and dispensed in the preset direction, and only through the forward and reverse rotation of the drive assembly during use, the normal use and rewinding of the carbon tape can be realized, the unused carbon tape can be rewound to the initial position, the waste of the carbon tape is avoided, and the utilization rate of the carbon tape is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other features and advantages of the utility model will become more apparent by describing in detail some example embodiments with reference to the attached drawings.

[0026] Figure 1 is a structural schematic diagram of a transmission mechanism of a printer according to an example embodiment Figure 1is a structural schematic diagram of a transmission mechanism of a printer according to an exemplary embodiment

[0027] Figure 2 is a first perspective view of a transmission mechanism of a printer according to an exemplary embodiment Figure 2 ;

[0028] Figure 3 is a first perspective view of a transmission mechanism of a printer according to an exemplary embodiment

[0029] Figure 4 is a second perspective view of a transmission mechanism of a printer according to an exemplary embodiment

[0030] Figure 5 is an enlarged view of D part in Figure 1 .

[0031] In the drawings, the following signs are used:

[0032] 1, drive assembly, 2, one-way drive shaft assembly, 3, meshing tooth, 4, abutting structure

[0033] 11, drive motor, 12, gear set

[0034] 21, carbon tape shaft, 22, clutch assembly

[0035] 221, reset structure, 222, ratchet wheel, 223, pawl, 224, shaft sleeve, 225, fixed shaft, 226, flange DETAILED DESCRIPTION

[0036] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the drawings, and thus a detailed description of them will not be repeated.

[0037] The terms "one", "a", "an", "the", "said", are used to denote one or more elements / components / etc.; the terms "include" and "have" are used to indicate an open inclusive meaning and that additional elements / components / etc. can be present in addition to those listed.

[0038] Figure 1 is a structural schematic diagram of a transmission mechanism of a printer according to an exemplary embodiment Figure 1 (With partial cross-sectional view); Figure 2 is a structural schematic diagram of a transmission mechanism of a printer according to an exemplary embodimentFigure 2 ; Figure 3 is a first perspective view of a transmission mechanism of a printer according to an example embodiment; Figure 4 is a second perspective view of a transmission mechanism of a printer according to an example embodiment; Figure 5 is Figure 1 is an enlarged view of part D in FIG.

[0039] As Figures 1 to 5 shown, the transmission mechanism of the printer according to an example embodiment includes a drive assembly 1 and two one-way drive shaft assemblies 2. Each one-way drive shaft assembly 2 includes a carbon tape shaft 21 and a clutch assembly 22 connected to the drive assembly 1 and the carbon tape shaft 21. The drive assembly 1 drives the carbon tape shaft 21 to rotate in one direction through the clutch assembly 22, and the rotation directions of the two carbon tape shafts 21 are opposite. When the drive assembly 1 rotates in one direction, one of the clutch assemblies 22 engages with the corresponding carbon tape shaft 21 and drives the carbon tape shaft 21 to rotate, and the other clutch assembly 22 disengages from the other carbon tape shaft 21.

[0040] The drive assembly 1 is the power source of the entire transmission system, responsible for providing rotational motion.

[0041] Each one-way drive shaft assembly 2 includes a carbon tape shaft 21 and a clutch assembly 22. The two clutch assemblies 22 ensure that the respective carbon tape shaft 21 can only rotate in a predetermined direction.

[0042] The clutch assembly 22 connects the drive assembly 1 and the carbon tape shaft 21 and controls the power transmission between them. According to the rotation direction of the drive assembly 1, the clutch assembly 22 can selectively engage or disengage with the corresponding carbon tape shaft.

[0043] Due to the design of the two one-way drive shaft assemblies 2, when the drive assembly 1 rotates in one direction, it will only rotate one of the carbon tape shafts 21, while the other carbon tape shaft 21 remains stationary. This is because each clutch assembly 22 has a one-way transmission feature, i.e., only allows torque transmission in its set direction.

[0044] It should be noted that the carbon tape shaft includes a carbon tape take-up shaft and a carbon tape feed shaft, and the two ends of the carbon tape are wound around a carbon tape take-up reel and a carbon tape feed reel, respectively. The carbon tape take-up reel is sleeved on the carbon tape take-up shaft, and the carbon tape feed reel is sleeved on the carbon tape feed shaft.

[0045] During printing, the driving assembly 1 rotates in the forward direction, drives the corresponding carbon tape shaft 21 (carbon tape recovery shaft) to rotate through one of the clutch assemblies 22, drives the carbon tape recovery roll to rotate, and drives the carbon tape delivery roll to rotate in the same direction through the carbon tape. At this time, since the other carbon tape shaft 21 (carbon tape delivery shaft) is disengaged from the corresponding clutch assembly 22, the corresponding carbon tape shaft 21 (carbon tape delivery shaft) rotates with the carbon tape delivery roll and does not drive the corresponding clutch assembly 22 to rotate.

[0046] During carbon tape return, the driving assembly 1 rotates in the reverse direction, drives the corresponding carbon tape shaft 21 (carbon tape delivery shaft) to rotate in the reverse direction through the other clutch assembly 22, thereby driving the delivery roll to rotate until the carbon tape is recovered. It should be noted that if the carbon tape between the carbon tape recovery roll and the carbon tape delivery roll is in a taut state in the initial state, the return process is the reverse movement of the printing process, which drives the carbon tape recovery roll to rotate in the reverse direction; if the carbon tape between the carbon tape recovery roll and the carbon tape delivery roll is not in a taut state in the initial state, the carbon tape recovery roll can not rotate during the return process until the carbon tape between the carbon tape recovery roll and the carbon tape delivery roll is in a taut state.

[0047] Here, the forward rotation and reverse rotation of the driving assembly 1 are for convenience of description and do not limit the actual operation process, which can be adjusted accordingly in actual operation.

[0048] In one embodiment, the driving assembly 1 includes a driving motor 11 and a gear set 12; the output end of the driving motor 11 is fixedly connected with an input gear in the gear set 12; the gear set 12 has two output gears, and the two output gears are respectively connected with two one-way drive shaft assemblies 2.

[0049] A idler gear is further connected between the input gear and the two output gears, so that the rotation directions of the two output gears are consistent.

[0050] The driving motor 11 serves as a power source of the entire system, and is responsible for providing necessary torque to drive the delivery and return operations of the carbon tape.

[0051] The gear set 12 can change the rotation speed. By meshing gears with different numbers of teeth, the effect of deceleration or acceleration can be achieved. According to the principle of power conservation, when the gear set 12 changes the speed, it also changes the torque. The greater the deceleration ratio, the greater the output torque; vice versa. This makes it possible to provide more force or more delicate speed control where needed.

[0052] There are various types of driving motors 11, which can be classified into multiple types according to different classification standards (such as working principle, power type, application field, etc.). The following are several common types of driving motors 1111 and their characteristics:

[0053] DC motors have high starting torque, good speed regulation, and are easy to control. They require a commutator and brushes, which can be complex to maintain and have a relatively short life. They are suitable for applications that require frequent starting, stopping, or speed regulation.

[0054] Synchronous motors rotate in synchronism with the frequency of the AC supply and are suitable for constant speed applications. They have high efficiency and good power factor.

[0055] Induction motors are the most common type of AC motor and are simple, rugged, and reliable. They have low cost, high reliability, and require little maintenance.

[0056] Permanent magnet synchronous motors use permanent magnets as the source of excitation and have high efficiency and power density. They are energy efficient, have fast response, and good dynamic performance.

[0057] Brushless DC motors combine the advantages of DC motors and AC motors by eliminating brushes and commutators. They have high efficiency, low noise, long life, and are easy to maintain.

[0058] In one embodiment, the clutch assembly 22 includes a reset structure 221 and a ratchet 222 and a pawl 223 that intermesh; the ratchet teeth of the two ratchets 222 in the two clutch assemblies 22 are oriented in opposite directions; the reset structure 221 is provided on the side of the ratchet 222 away from the pawl 223; the ratchet 222 is drivingly connected to the drive assembly 1, and the pawl 223 is drivingly connected to the carbon belt shaft 21; the drive assembly 1 drives the carbon belt shaft 21 to rotate through the cooperation of the ratchet 222 and the pawl 223.

[0059] The ratchet 222 in each one-way drive shaft assembly 2 is directly connected to the drive assembly 1, i.e., the output gear of the gear set 12. Specifically, the side of the ratchet 222 is provided with a meshing tooth 3 that meshes with the output gear.

[0060] The pawl 223 is connected to the carbon belt shaft 21 and meshes with the ratchet 222. The design of the ratchet 222 and the pawl 223 allows the ratchet 222 to drive the pawl 223 to rotate freely in one direction, and in the opposite direction, the pawl 223 disengages from the ratchet 222, and the ratchet 222 idles.

[0061] The reset structure 221 is located on the side of the ratchet 222 away from the pawl 223 and provides a reset force for the ratchet 222 to reengage with the pawl 223 after each disengagement. This can be a spring or other elastic element to ensure that the pawl 223 is always aligned with the ratchet teeth.

[0062] The two clutch assemblies 22 are opposite in direction, so that when the drive assembly 1 rotates in one direction, one of the ratchets 222 can drive the corresponding carbon tape shaft 21, while the other ratchet 222 cannot drive the corresponding carbon tape shaft 21 due to the pawl 223, but the carbon tape shaft 21 can rotate with the ratchet. Conversely, the other ratchet 222 can drive the corresponding carbon tape shaft 21, while the first ratchet 222 cannot drive the corresponding carbon tape shaft 21 due to the pawl 223, but the carbon tape shaft 21 can rotate with the ratchet.

[0063] The working process is as follows:

[0064] The drive motor 11 starts to rotate, and the rotation is transmitted to the two output gears through the gear set 12. Due to the idler gear, the rotation directions of the two output gears are consistent.

[0065] When printing normally, the drive assembly 1 (output gear) rotates clockwise:

[0066] One ratchet 222 (ratchet 222B) engages with the corresponding pawl 223 (assuming pawl 223B) and drives the carbon tape shaft 21 connected with the pawl 223B to rotate synchronously, that is, through the cooperation of the ratchet 222B and the pawl 223B, the carbon tape take-up reel is driven to rotate;

[0067] The other ratchet 222 (assuming ratchet 222A) is disengaged from the corresponding pawl 223 (assuming pawl 223A), and the ratchet 222A idles, and the pawl 223A cannot drive the corresponding carbon tape shaft 21 to rotate, but the carbon tape take-up reel can drive the carbon tape supply reel to rotate through the carbon tape, which is equivalent to the rotation of the ratchet 222A, thereby achieving the supply of the carbon tape.

[0068] When the carbon tape needs to be rewound, the drive assembly 1 rotates counterclockwise:

[0069] The other ratchet 222A engages with the pawl 223A and drives the carbon tape shaft 21 connected with the pawl 223A to rotate synchronously, that is, through the cooperation of the ratchet 222A and the pawl 223A, the carbon tape supply reel is driven to rotate.

[0070] The ratchet 222B is disengaged from the corresponding pawl 223B, and the ratchet 222B idles and cannot drive the corresponding carbon tape shaft 21 to rotate, but the carbon tape take-up reel can rotate with the ratchet 222B. Whether it rotates or not depends on the state, which will not be described here. Please refer to the previous description.

[0071] The clockwise and counterclockwise rotation of the drive assembly 1 is for convenience of description, and does not limit the actual operation process.

[0072] Each time the driving assembly 1 changes the direction of rotation or stops, the reset structure 221 acts on the ratchet wheel 222, disengaging the pawl 223 from the ratchet wheel 222 and resetting to engage the pawl 223 again, so as to correctly engage or disengage when the driving assembly 1 rotates next time. Specifically, the reset structure 221 can be a spring, a spring sheet, or a magnetic reset structure, which is not limited here.

[0073] In one embodiment, the adjacent two edges of each ratchet tooth of each ratchet wheel 222 are a vertical edge and an inclined edge respectively, and the directions of the corresponding inclined edges of the two ratchet wheels 222 are opposite.

[0074] The design of the vertical edge enables the pawl 223 to tightly engage with the ratchet wheel 222, ensuring the maximum contact area between the two. When the driving assembly 1 rotates in the predetermined direction, the pawl tooth can accurately embed into the vertical edge of the ratchet tooth, providing stable engagement.

[0075] The design of the vertical edge enables the force transmitted to the ratchet wheel 222 to be almost completely concentrated in the radial direction, without being dispersed in the axial direction. This helps to reduce unnecessary axial load, protecting the bearings and other axial limiting devices from additional stress, and prolonging their service life.

[0076] Since the vertical edge can effectively transmit the torque of the driving assembly 1 to the carbon belt shaft 21, it reduces energy loss and improves the power transmission efficiency of the entire system. This means that more input energy is converted into useful mechanical work, rather than being wasted in friction or other ineffective movements.

[0077] The presence of the inclined edge enables the pawl 223 to easily slide over the ratchet tooth when not in operation, avoiding forced and hard collision. This design not only reduces wear and tear, but also reduces noise and vibration, improving the smoothness of the system operation.

[0078] When the driving assembly 1 rotates in the opposite direction, the inclined edge allows the pawl 223 to smoothly slide through without engaging with the ratchet wheel 222, thereby realizing the function of one-way clutch. This design ensures that the corresponding carbon belt assembly is only activated when needed, improving the reliability and operation accuracy of the system.

[0079] The combined design of the vertical edge and the inclined edge ensures high stability and reliability of the system during operation. Whether starting, stopping or switching operation mode, it can maintain good performance.

[0080] By optimizing the shape of the ratchet tooth, the need for complex control logic is reduced, simplifying the overall mechanical structure. This not only reduces manufacturing costs, but also improves the maintainability of the system.

[0081] Users can enjoy a more smooth operation experience, without worrying about the design flaws caused by the stall or failure problems. In addition, low noise and smooth operation also improve the user's satisfaction.

[0082] In one embodiment, the reset structure 221 is a spring, one end of which is in abutment with the abutment structure 4 of the printer, and the other end is in abutment with the side of the ratchet wheel 222 away from the pawl 223.

[0083] The function of the spring is to provide the necessary reset force to restore the ratchet wheel 222 to the initial position of engagement with the pawl 223 each time the drive assembly 1 changes the direction of rotation or stops. The design of the spring needs to consider the appropriate spring force and pre-tightening force to ensure that the ratchet wheel 222 can be reset smoothly, and the pawl 223 and the ratchet wheel 222 will not be hard collision due to excessive spring force. Specifically, the abutment structure 4 can be a support plate, or in abutment with the inner shell of the printer, that is, one end of the spring is directly in abutment with the inner shell of the printer.

[0084] When the abutment structure 4 is a support plate, the support plate serves as the mounting base of the spring. The support plate is usually fixed on the frame or other stable structure of the printer to ensure that the spring can stretch within a controlled range and will not be offset or misaligned. The support plate must be strong enough to withstand the force exerted by the spring and ensure that the spring will not fatigue or fail during long-term use.

[0085] In one embodiment, the clutch assembly 22 further comprises a shaft sleeve 224 sleeved on the carbon belt shaft 21, and the pawl 223 is arranged on the shaft sleeve 224, and the shaft sleeve 224 is drivingly connected with the carbon belt shaft 21. In another embodiment, a fixed shaft 225 is further included, the shaft sleeve 224 and the carbon belt shaft 21 are sleeved on the fixed shaft 225, and the fixed shaft 225 is provided with a limiting structure to limit the axial movement of the shaft sleeve 224 or the carbon belt shaft 21.

[0086] The fixed shaft 225 is vertically and fixedly connected to the support plate, serving as the core support of the entire clutch assembly 22. The fixed shaft 225 provides a basis for mounting and positioning other components, ensuring that all components can work stably.

[0087] The shaft sleeve 224 is sleeved on the carbon belt shaft 21 and drivingly connected with the carbon belt shaft 21 through some means, such as a key groove or a spline. This means that when the shaft sleeve 224 rotates, it will drive the carbon belt shaft 21 to rotate synchronously.

[0088] The pawl 223 is arranged on and fixedly connected to the shaft sleeve 224, which can also be achieved by means of a key groove or a spline.

[0089] The ratchet wheel 222 is rotationally connected to the fixed shaft 225, allowing it to rotate freely.

[0090] The spring is installed on the fixed shaft 225, one end connected to the support plate, the other end connected to the ratchet wheel 222 away from the pawl 223.

[0091] The limiting structure is used to limit the axial movement of the shaft sleeve 224 or the carbon belt shaft 21, ensuring that they can only rotate around the fixed shaft 225 without axial sliding. The limiting structure can be a snap spring, a washer, a shaft shoulder, etc. These elements are usually installed at both ends or in the middle of the fixed shaft 225, forming an effective axial block.

[0092] The snap spring is installed in the groove of the fixed shaft 225, playing an axial limiting role. It is a simple and effective limiting method, low in cost and easy to install.

[0093] The washer is placed at the end or in the middle of the fixed shaft 225 and is pressed tightly by a nut or other fasteners to prevent the shaft sleeve 224 or the carbon belt shaft 21 from sliding axially.

[0094] The shaft shoulder is a stepped flange 226 directly machined on the fixed shaft 225, used to prevent the axial movement of the shaft sleeve 224 or the carbon belt shaft 21. This design does not require additional parts, but requires precise machining during manufacturing.

[0095] By integrating the shaft sleeve 224, the pawl 223, the ratchet wheel 222, and the reset structure 221 into one fixed shaft 225, the entire clutch assembly 22 appears more compact, saving space.

[0096] The two carbon belt shafts 21 are respectively the recovery shaft and the dispensing shaft, which realize one-way rotation through the clutch assembly 22 (including the ratchet wheel 222, the pawl 223, and the reset structure 221) and ensure that the carbon belt can be correctly wound and rewound during printing. Here is the detailed workflow of this system during normal printing and rewinding operations:

[0097] Normal printing process

[0098] The drive motor 11 starts to rotate clockwise (assuming), and transmits the rotary motion to the two output gears through the gear set 12.

[0099] The ratchet wheel 222 connected to the recovery shaft (assuming it is ratchet wheel 222A) and the corresponding pawl 223 (pawl 223A) are engaged. At this time, the pawl 223A is embedded in the ratchet teeth, and as the drive assembly 1 rotates, the ratchet wheel 222A drives the recovery shaft to rotate clockwise.

[0100] The rotation of the recovery shaft will synchronize the rotation of the carbon belt, but the dispensing shaft will not rotate because its ratchet wheel 222 (ratchet wheel 222B) is disengaged from the pawl 223 (pawl 223B), causing the ratchet wheel 222B to idle.

[0101] As the recovery shaft rotates, the carbon tape is gradually wound onto the recovery shaft while being unwound from the dispensing shaft to support the printing operation.

[0102] Whenever the drive assembly 1 stops rotating, the spring in the reset structure 221 pushes the ratchet 222B back to the starting position, ready for the next engagement.

[0103] The rewind operation process

[0104] The drive motor 11 starts to rotate counterclockwise (relative to the direction during normal printing).

[0105] The ratchet 222 (ratchet 222B) connected to the dispensing shaft and the corresponding pawl 223 (pawl 223B) are engaged. At this time, the pawl 223B is embedded in the ratchet teeth, and as the drive assembly 1 rotates, the ratchet 222B drives the dispensing shaft to rotate clockwise.

[0106] The rotation of the dispensing shaft will synchronize the rotation of the carbon tape recovery shaft through the carbon tape, but the recovery shaft will not rotate the carbon tape recovery shaft because its ratchet 222 (ratchet 222A) is disengaged from the pawl 223 (pawl 223A), causing the ratchet 222A to idle.

[0107] As the dispensing shaft rotates clockwise, the carbon tape is gradually unwound from the recovery shaft and rewound onto the dispensing shaft, achieving the rewind operation of the carbon tape.

[0108] Whenever the drive assembly 1 stops rotating, the spring in the reset structure 221 pushes the ratchet 222A back to the starting position, ready for the next engagement.

[0109] The present scheme also protects a thermal transfer printer, comprising a transmission mechanism of the printer as described above, and the transmission mechanism is arranged in the shell of the printer.

[0110] In the embodiments of the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0111] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0112] In the description of the present specification, the description of the terms "one embodiment", "one preferred embodiment" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0113] The above is only the preferred embodiment of the present application, and is not intended to limit the embodiments of the present application. For those skilled in the art, the embodiments of the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A transmission mechanism for a printer, characterized in that, include: Drive assembly (1) and two unidirectional drive shaft assemblies (2); Each of the unidirectional drive shaft assemblies (2) includes a carbon belt shaft (21) and a clutch assembly (22) that is drive-connected to the drive assembly (1) and the carbon belt shaft (21); The drive assembly (1) drives the carbon belt shaft (21) to rotate in one direction through the clutch assembly (22), and the two carbon belt shafts (21) rotate in opposite directions; When the drive assembly (1) rotates in one direction, one of the clutch assemblies (22) engages with the corresponding carbon belt shaft (21) and drives the carbon belt shaft (21) to rotate, while the other clutch assembly (22) disengages from the other carbon belt shaft (21).

2. The transmission mechanism of a printer according to claim 1, characterized in that, The clutch assembly (22) includes a reset structure (221) and a ratchet (222) and a pawl (223) that mesh with each other; The ratchet teeth of the two ratchets (222) in the two clutch assemblies (22) are oriented in opposite directions; The reset structure (221) is located on the side of the ratchet (222) opposite to the pawl (223); The ratchet (222) is driven to the drive assembly (1), and the pawl (223) is driven to the carbon belt shaft (21); The drive assembly (1) drives the carbon belt shaft (21) to rotate through the cooperation of the ratchet (222) and the pawl (223).

3. The transmission mechanism of a printer according to claim 2, characterized in that, Each ratchet tooth of each ratchet (222) has a vertical side and an inclined side on two adjacent sides, and the inclined sides of the two ratchets (222) are in opposite directions.

4. The transmission mechanism of a printer according to claim 2 or 3, characterized in that, The reset structure (221) is a spring. One end of the spring abuts against the printer's abutting structure (4), and the other end abuts against the side of the ratchet (222) away from the pawl (223).

5. The transmission mechanism of a printer according to claim 2 or 3, characterized in that, The clutch assembly (22) further includes a bushing (224) sleeved on the carbon belt shaft (21), a pawl (223) is provided on the bushing (224), and the bushing (224) is drivenly connected to the carbon belt shaft (21).

6. The transmission mechanism of a printer according to claim 5, characterized in that, The clutch assembly (22) further includes a fixed shaft (225), the bushing (224) and the carbon belt shaft (21) are sleeved on the fixed shaft (225), and the fixed shaft (225) is provided with a limiting structure to restrict the bushing (224) or the carbon belt shaft (21) from moving axially.

7. The transmission mechanism of a printer according to claim 6, characterized in that, The limiting structure is a flange (226) provided around the periphery of the fixed shaft (225).

8. The transmission mechanism of a printer according to claim 2, characterized in that, The drive assembly (1) includes a drive motor (11) and a gear set (12), the gear set (12) including an input gear and two output gears; The output end of the drive motor (11) is coaxially and fixedly connected to the input gear in the gear set (12); The two output gears are respectively driven and connected to the two clutch components (22).

9. The transmission mechanism of a printer according to claim 8, characterized in that, The ratchet (222) has a meshing tooth (3) on its side, which meshes with the output gear.

10. A thermal transfer printer, characterized in that, Includes the transmission mechanism of the printer as described in any one of claims 1 to 9.

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