Carbon tape cassette drive structure and thermal transfer printer

Abstract

A carbon tape box drive structure is characterized by comprising a base, a winding motor, a transmission gear set, a winding shaft, a first connecting sleeve, a winding shaft, a second connecting sleeve, a constant torque mechanism and a damping mechanism, the constant torque mechanism is arranged on the winding shaft, and the carbon tape is always in a taut state; the damping mechanism is arranged on the winding shaft, and the winding shaft generates damping when rotating. The application discloses a thermal transfer printer. At the beginning and end of the rotation of the carbon tape, the constant torque mechanism and the damping mechanism cooperate to make the carbon tape supplied by the winding core always in a taut state, has a certain tension, and does not appear loose and collapsed, ensures that the printing points are more regular and uniform, and guarantees the printing quality.

Description

TECHNICAL FIELD

[0001] The present application relates to a printer driving mechanism, in particular to a driving structure of a carbon tape box, and further relates to a printer. BACKGROUND

[0002] The thermal transfer printer is widely used in various industries due to its fast printing speed and long preservation time. The thermal transfer printer uses carbon tape as printing medium, and transfers the carbon powder coating on the carbon tape to the paper through heating. It is widely used in banks, hospitals, supermarkets and other places.

[0003] Many portable designs of thermal transfer printers have appeared, and the basic structure includes a base, a thermal print head assembly arranged on the base, and a top cover which can be reversibly arranged on the base. The top cover is rotatably arranged with a rubber roller. In the state that the top cover is folded with the base, the rubber roller is close to the thermal print head assembly.

[0004] The thermal transfer printing machine usually includes two groups of driving structures. The first group of driving structures drives the rubber roller to rotate through the paper feed motor to control the movement of the printing paper. The second group of driving structures is used to realize the dispensing and recovery of the carbon tape. The existing carbon tape is arranged on a support to form a carbon tape box. The carbon tape box has a supply spool and a winding spool. The speed of the supply spool and the winding spool must be kept consistent, and the rhythm of winding and unwinding must also be controlled well, otherwise it will affect the uniformity of the printer, and even the carbon tape will be pulled off. SUMMARY

[0005] The first technical problem to be solved by the present application is to provide a carbon tape box driving structure that can keep the supply spool and the winding spool at the same rhythm, thereby making the printing points uniform.

[0006] The second technical problem to be solved by the present application is to provide a thermal transfer printer that can keep the supply spool and the winding spool at the same rhythm, thereby making the printing points uniform.

[0007] The technical solution adopted by the present application to solve the above-mentioned first technical problem is a carbon tape box driving structure, characterized by comprising

[0008] a base including a support portion at the bottom end and a vertical plate portion on the support portion;

[0009] a winding motor arranged on the base and having an output gear on the power output end;

[0010] a transmission gear set rotatably arranged on the vertical plate portion, and the power input end is engaged with the output gear;

[0011] A winding shaft is rotatably arranged on the vertical plate, and has an input gear on the winding shaft, which is engaged with the output gear of the transmission gear set,

[0012] A first connecting sleeve is arranged on the end of the winding shaft, and is connected with the winding core of the carbon tape cartridge.

[0013] An unwinding shaft is rotatably arranged on the vertical plate.

[0014] A second connecting sleeve is arranged on the end of the unwinding shaft, and is connected with the supply core of the carbon tape cartridge.

[0015] A constant torque mechanism is arranged on the winding shaft, and can keep the carbon tape in a taut state.

[0016] A damping mechanism is arranged on the unwinding shaft, and can generate damping when the unwinding shaft rotates.

[0017] The winding shaft is sleeved with a first compression spring, and the outer end of the first compression spring acts on the first connecting sleeve and always forces the first connecting sleeve to keep extending outward. The first connecting sleeve can be stably connected with the winding core.

[0018] The unwinding shaft is sleeved with a second compression spring, and the outer end of the second compression spring acts on the second connecting sleeve and always forces the second connecting sleeve to keep extending outward, so as to ensure that the second connecting sleeve can be stably connected with the supply core.

[0019] As a preferred, one side of the input gear is formed with a first embedding groove, and the constant torque mechanism can include

[0020] A first shaft sleeve is sleeved on the winding shaft and has a second embedding groove on the front end face; and

[0021] A torsional spring is sleeved on the winding shaft, and the front end is embedded in the first embedding groove, and the rear end is embedded in the second embedding groove.

[0022] The winding shaft is sleeved with a third compression spring, which is located between the vertical plate and the first shaft sleeve. The input gear and the transmission gear set can always be kept in engagement state without being disengaged.

[0023] Further, the base is provided with a gear cover, the gear cover has a first through hole for the winding shaft to pass through and a second through hole for the unwinding shaft to pass through, the transmission gear set is located in the inner cavity formed by the base and the gear cover, and the first connecting sleeve and the second connecting sleeve are located outside the gear cover.

[0024] As a preferred, the inner side of the gear cover close to the second through hole is provided with a third embedding groove, and the damping mechanism can include

[0025] A second shaft sleeve is arranged on the unwinding shaft.

[0026] A third shaft sleeve is arranged on the unwinding shaft and adjacent to the second shaft sleeve; and

[0027] A holding spring is sleeved on the second shaft sleeve and the front end of the holding spring is limited by the rear end face of the third shaft sleeve, and the rear end of the holding spring is a free end, and the front end of the holding spring is embedded in the third embedding groove, and the holding spring can hold the second shaft sleeve to generate a damping force under the condition of rotation of the unwinding shaft.

[0028] The technical scheme adopted by the present application to solve the second technical problem is: a thermal transfer printer, characterized by comprising a base and a carbon tape box driving structure arranged on the base.

[0029] Compared with the prior art, the present application has the advantages that: the winding shaft is provided with a constant torque mechanism, which can ensure that the output force is relatively stable and controllable, has a certain self-adjusting ability, the unwinding shaft is provided with a damping mechanism, which can generate damping when the unwinding shaft rotates; at the beginning and end of the rotation of the carbon tape, the constant torque mechanism and the damping mechanism cooperate to promote the carbon tape supplied to the core to be in a taut state at all times, have a certain tension, and will not appear loose and collapsed phenomenon, ensure that the printing points are more regular and uniform, ensure the printing quality, and also avoid the carbon tape being pulled off and the excessive power consumption of the host caused by excessive load. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the embodiment.

[0031] Figure 2 It is a structural schematic diagram of the embodiment after the top cover is opened.

[0032] Figure 3 It is an exploded view of the embodiment.

[0033] Figure 4 It is a structural schematic diagram of the embodiment. Figure 3 It is a structural schematic diagram of the embodiment from another angle.

[0034] Figure 5 It is an enlarged schematic diagram of the carbon tape box driving mechanism.

[0035] Figure 6 It is a structural schematic diagram of the embodiment after the gear cover is removed. Figure 5

[0036] It is a partial exploded view of the embodiment. Figure 7 Figure 6

[0037] Figure 8 It is a structural schematic diagram of the embodiment from another angle. Figure 5

[0038] It is a structural schematic diagram of the embodiment. Figure 9 Figure 7 ​​​Another perspective view of the input gear. DETAILED DESCRIPTION

[0039] The application will be further described in conjunction with the embodiments with reference to the accompanying drawings.

[0040] As shown in Figure 1 , Figure 2 and Figure 3 , the thermal transfer printer in the embodiment comprises a base 1a and a top cover 2a reversibly arranged on the base 1a, the base 1a is provided with a thermal print head assembly 4a, a carbon ribbon cassette 5a and a carbon ribbon cassette driving mechanism 6a, the top cover 2a is rotatably provided with a rubber roller 3a, and the rubber roller 3a is close to the thermal print head assembly 4a when the top cover 2a is folded with the base 1a. Figure 4 As shown in , the carbon ribbon cassette 5a is provided with a take-up core 51a and a supply core 52a, and the take-up core 51a and the supply core 52a are provided with a carbon ribbon (not shown in the figure). The rear end of the top cover 2a is provided with a paper feeding port 11a, and the front end of the base 1a is formed with a paper discharging port 12a.

[0041] Figure 5 , Figure 6 and Figure 7 , the carbon ribbon cassette driving mechanism 6a in the embodiment comprises a base 1, a take-up motor 3, a transmission gear set 32, a take-up shaft 4, a first connecting sleeve 45, a supply shaft 2, a second connecting sleeve 25, a constant torque mechanism, a damping mechanism and a gear cover 13.

[0042] The base 1 comprises a support portion 11 at the bottom end and a vertical plate portion 12 on the support portion 11; the take-up motor 3 is arranged on the base 1 and has an output gear 31 at the power output end; the transmission gear set 32 is rotatably arranged on the vertical plate portion 12, and the power input end is engaged with the output gear 31.

[0043] The take-up shaft 4 is rotatably arranged on the vertical plate portion 12, and the take-up shaft 4 is provided with an input gear 43 engaged with the output end of the transmission gear set 32 for transmission, as shown in Figure 9 , one side of the input gear 43 is formed with a first embedding groove 431, and the first connecting sleeve 45 is arranged at the end of the take-up shaft 4 and can be connected with the take-up core 51a of the carbon ribbon cassette.

[0044] The supply shaft 2 is rotatably arranged on the vertical plate portion 12; the second connecting sleeve 25 is arranged at the end of the supply shaft 2 and can be connected with the supply core 52a of the carbon ribbon cassette.

[0045] The first compression spring 44 is sleeved on the winding shaft 4, and the outer end of the first compression spring 44 acts on the first connecting sleeve 45 and always forces the first connecting sleeve 45 to keep the tendency of extending outward. The second compression spring 24 is sleeved on the unwinding shaft 2, and the outer end of the second compression spring 24 acts on the second connecting sleeve 25 and always forces the second connecting sleeve 25 to keep the tendency of extending outward.

[0046] The constant torque mechanism is arranged on the winding shaft 4, and can keep the carbon tape in a taut state; the constant torque mechanism in the embodiment includes the first shaft sleeve 41 and the torsion spring 42, the first shaft sleeve 41 is sleeved on the winding shaft 4 and has the second embedding groove 411 on the front end face; the torsion spring 42 is sleeved on the winding shaft 4, the front end is embedded in the first embedding groove 431, and the rear end is embedded in the second embedding groove 411. The third compression spring 46 is sleeved on the winding shaft 4 and located between the vertical plate part 12 and the first shaft sleeve 41.

[0047] Combining Figure 8 As shown in the figure, the gear cover 13 is arranged on the base 1, the gear cover 13 has the first through hole 132 for the winding shaft 4 to pass through and the second through hole 131 for the unwinding shaft 2 to pass through, the transmission gear set 32 is located in the inner cavity formed by the base 1 and the gear cover 13, and the first connecting sleeve 45 and the second connecting sleeve 25 are located outside the gear cover 13. The third embedding groove 14 is arranged on the inner side of the gear cover 13 close to the second through hole 131.

[0048] The damping mechanism is arranged on the unwinding shaft 2 and can generate damping when the unwinding shaft 2 rotates. The damping mechanism in the embodiment includes the second shaft sleeve 23, the third shaft sleeve 21 and the embracing spring 22, the second shaft sleeve 23 is arranged on the unwinding shaft 2; the third shaft sleeve 21 is arranged on the unwinding shaft 2 and adjacent to the second shaft sleeve 23; the embracing spring 22 is sleeved on the second shaft sleeve 23 and the front end is limited by the rear end face of the third shaft sleeve 21, the front end of the embracing spring 22 is embedded in the third embedding groove 14, and the rear end is a free end. The embracing spring 22 can embrace the second shaft sleeve 23 to generate damping force under the condition that the unwinding shaft 2 rotates.

[0049] The winding motor 3 drives the winding shaft 4 to rotate through the transmission gear set 32, so that the first connecting sleeve 45 drives the winding core 52a of the carbon tape box to rotate, the constant torque mechanism works, the output force can be guaranteed to be relatively stable and controllable, has a certain self-adjusting ability, the first connecting sleeve 45 drives the supply winding core 51a to rotate, the second connecting sleeve 25 rotates, drives the unwinding shaft 2 to rotate, and the embracing spring 22 embraces the second shaft sleeve 23. Since the rear end of the embracing spring 22 is a free end, a certain damping force is generated, and if the reverse rotation is generated, a greater damping force is generated, so that the second connecting sleeve can rotate in the reverse direction.

[0050] At the beginning and end of the carbon tape rotation, the constant torque mechanism and the damping mechanism cooperate to keep the carbon tape on the supply core in a taut state at all times, with a certain tension, without appearing loose and collapsed, ensuring more regular and uniform printing points, ensuring printing quality, and avoiding excessive load causing the carbon tape to be pulled apart and excessive power consumption of the host.

Claims

1. A carbon ribbon cartridge driving structure, characterized in that... Comprising a base (1) comprising a support portion (11) at a bottom end and a vertical plate portion (12) on the support portion (11); a winding motor (3) provided on the base (1) and having an output gear (31) at a power output end; a transmission gear set (32) rotatably provided on the vertical plate portion (12) and having a power input end engaged with the output gear (31); a winding shaft (4) rotatably provided on the vertical plate portion (12) and having an input gear (43) engaged with an output end of the transmission gear set (32), a first connecting sleeve (45) provided at an end of the winding shaft (4) and connectable with a winding core of a carbon tape cartridge; an unwinding shaft (2) rotatably provided on the vertical plate portion (12); a second connecting sleeve (25) provided at an end of the unwinding shaft (2) and connectable with a supply core of the carbon tape cartridge; a constant torque mechanism provided on the winding shaft (4) and capable of keeping the carbon tape in a taut state; and a damping mechanism provided on the unwinding shaft (2) and capable of generating damping when the unwinding shaft (2) rotates; the winding shaft (4) is sleeved with a first compression spring (44), an outer end of the first compression spring (44) acts on the first connecting sleeve (45) and always forces the first connecting sleeve (45) to keep a tendency of extending outward; the winding shaft (4) is sleeved with a third compression spring (46), the third compression spring (46) is located between the vertical plate portion (12) and a first shaft sleeve (41); the base (1) is provided with a gear cover (13), the gear cover (13) has a first through hole (132) through which the winding shaft (4) penetrates and a second through hole (131) through which the unwinding shaft (2) penetrates, the transmission gear set (32) is located in an inner cavity formed by the base (1) and the gear cover (13), and the first connecting sleeve (45) and the second connecting sleeve (25) are located outside the gear cover (13); the gear cover (13) is provided with a third embedding groove (14) close to the second through hole (131), and the damping mechanism comprises a second shaft sleeve (23) provided on the unwinding shaft (2); a third shaft sleeve (21) provided on the unwinding shaft (2) and arranged adjacent to the second shaft sleeve (23); and a clamping spring (22) sleeved on the second shaft sleeve (23) and limited by a rear end face of the third shaft sleeve (21) at a front end, the clamping spring (22) is embedded on the third embedding groove (14) at the front end and is a free end at the rear end, and the clamping spring (22) can clamp the second shaft sleeve (23) to generate a damping force under the condition that the unwinding shaft (2) rotates. the unwinding shaft (2) is sleeved with a second compression spring (24), an outer end of the second compression spring (24) acts on the second connecting sleeve (25) and always forces the second connecting sleeve (25) to keep a tendency of extending outward.

2. The carbon tape cartridge drive structure according to claim 1, wherein one side of the input gear (43) is formed with a first embedding groove (431), and the constant torque mechanism comprises 3. The carbon tape cartridge drive structure of claim 1 wherein a first shaft sleeve (41) sleeved on the winding shaft (4) and having a second embedding groove (411) at a front end face; and ​ A torsion spring (42) is sleeved on the winding shaft (4), the front end is embedded in the first embedding groove (431), and the rear end is embedded in the second embedding groove (411).

4. A thermal transfer printer having the carbon ribbon cartridge drive structure of any one of claims 1 to 3, characterized by The carbon tape box driving structure comprises a base (1a) and a carbon tape box driving structure arranged on the base (1a).

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