CN113459677A

CN113459677A - Thermal printer core

Info

Publication number: CN113459677A
Application number: CN202110883978.7A
Authority: CN
Inventors: 蒋文柏; 张敏; 陈志锋
Original assignee: NINGBO JINGXIN TECHNOLOGY CO LTD
Current assignee: NINGBO JINGXIN TECHNOLOGY CO LTD
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2021-10-01
Anticipated expiration: 2041-08-03
Also published as: CN113459677B

Abstract

The utility model provides a thermal printer core, includes bed frame, mounting bracket, beats printer head, moves sword and rubber roll subassembly, and aforesaid beats printer head and locates on the bed frame, and this mounting bracket is located on aforesaid bed frame through shirking the mechanism, and aforesaid moves the sword and can locate on the bed frame movably and at least one end has a rack portion, its characterized in that shirk the mechanism and include pivot, handle, reset piece and axostylus axostyle, the bed frame on be equipped with and drive output gear pivoted drive assembly. The driving assembly comprises a push block and a slide block, the slide block after being stressed can move to push the output gear to rotate, and finally the knife returns. Even if the situation that the cutter is jammed, the existence of the sliding block can still smoothly complete the return of the driving movable cutter.

Description

Thermal printer core

Technical Field

The invention relates to a printing device, in particular to a thermal printer core.

Background

The existing Thermal printer generally comprises a base frame, a motor, a transmission gear assembly, a printing Head assembly and a rubber roll which can be rotatably arranged on the base frame, a power input end of the transmission gear assembly is meshed with a driving output gear of the motor, a power output end of the transmission gear assembly is meshed with the rubber roll which is arranged at the end part of the rubber roll, the rubber roll is used for driving printing paper to move, a paper feeding channel is arranged between the rubber roll and the printing Head assembly, the printing Head assembly generally comprises a printing Head (TPH for short, Thermal Print Head), a printing Head support, a pressure spring and a pressure spring support frame, the printing Head is arranged on the printing Head support, two ends of the base frame are arranged at two ends of the pressure spring support frame, two ends of the pressure spring respectively abut against the printing Head support and the pressure spring support frame, and the printing Head can be pressed on the surface of the rubber roll. When the printing paper is loaded or corrected, the printing paper is generally loaded or corrected by disassembling the rubber roller, two bearings are generally arranged at two ends of the rubber roller, a groove for arranging the bearings is formed in the base frame, the groove is semicircular, and the bearings are always positioned in the groove in a working state; when paper needs to be fed, the rubber roller communicating bearing can be easily separated from the groove. But has the following disadvantages: the bearing has larger range of play in the groove, which influences the normal operation of the rubber roller.

Therefore, an improved structure is disclosed in the prior art, and the improved structure refers to the chinese utility model patent with patent number ZL200520130017.5, namely miniature heat medium printer movement (with the number of grant publication being CN2725292Y), wherein a door opening pressing sheet and a return elastic sheet are additionally arranged in the improved structure, and the pressure of the return elastic sheet acts on the door opening pressing sheet, so as to ensure that the rubber roller is stably positioned in the positioning groove. The door opening pressing piece is an unconventional part, so that the process difficulty is improved, and the manufacturing cost is increased.

On this basis, the applicant has developed a novel rubber roll detachable construction, see chinese utility model patent's that patent number is ZL201120357824.6 bed frame and rubber roll assembly structure and applied the thermal printer that has this assembly structure (the grant bulletin number is CN202271666U), the bearing in this patent is located in the recess of bed frame through the jump ring of a special shape system for the assembly of rubber roll is shirked easily swiftly, and simultaneously, in the use, the bearing can not take place the drunkenness by the effect of the spacing portion of elasticity almost, guarantees the normal stable operation of rubber roll.

As a further improvement, the applicant also applies for a thermal printer, see patent No. ZL201710535432.6, chinese patent invention thermal printer (No. CN107310276B), in which when printing paper is loaded or needs to be corrected, the mounting frame springs away from the base frame by slightly pulling the handle, and the first swing part and the second swing part will instantaneously act on the stationary knife, so that the stationary knife sinks vertically, the positive contact pressure between the cutting edge of the moving knife and the cutting edge of the stationary knife is reduced, the resistance of the return of the moving knife is relieved, and the moving knife returns smoothly. However, in the actual use situation, when the paper which is cut continuously is jammed between the contact surfaces of the movable blade and the fixed blade (generally called as a paper jam), the sinking abdication of the fixed blade is difficult to reduce the resistance of the paper jam to the return of the movable blade, so that the movable blade cannot be retracted and the function is disabled.

Disclosure of Invention

The invention aims to solve the technical problem of providing a thermal printer core which can still quickly return a movable knife after a paper jam.

The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a thermal printer core, includes bed frame, mounting bracket, beats printer head, moves sword and rubber roller assembly, and aforesaid beats printer head and locates on the bed frame, and aforesaid rubber roller assembly can locate the mounting bracket with rotating through the rubber roller axle, and this mounting bracket locates on aforesaid bed frame through shirking the mechanism, and aforesaid mounting bracket sets up under the state of bed frame, the rubber roller of rubber roller assembly is close to and beats printer head, and aforesaid moves the sword and can locate movably on the bed frame and at least one end has rack portion, and aforesaid bed frame one side is equipped with transmission gear group, the output gear of this transmission gear group with move the rack portion meshing of sword one side, its characterized in that shirk the mechanism and include:

a rotating shaft which is rotatably arranged on the base frame in a direction parallel to the length direction of the printing head; a first swing rod and a second swing rod which can rotate along with the rotating shaft are respectively arranged at the two ends of the first swing rod, a first gear tooth is formed at one side of the first swing rod, a first driving part is arranged at one end of the first swing rod,

the handle is rotatably arranged on the base frame, second gear teeth which are meshed with the first gear teeth for transmission are formed on the inner side of the handle, and the outer end of the handle extends outwards to form a pulling part;

the reset piece is arranged on the base frame and always forces the rotating shaft to keep an initial state; and

the shaft lever is arranged on the mounting rack and is parallel to the rubber roll shaft;

the base frame is provided with a strip-shaped groove, a driving assembly for driving the output gear to rotate is arranged in the strip-shaped groove, the driving assembly comprises a support shaft, a sliding block, a pushing block and a return spring, and the support shaft is inserted into the strip-shaped groove; the sliding block is sleeved on the fulcrum and can move up and down and transversely relative to the fulcrum; the pushing block is sleeved at the bottom end of the fulcrum shaft and is positioned below the sliding block, and the pushing block can drive the sliding block to move upwards when moving upwards; one side of the push block is bent upwards to extend a blocking part which is abutted against the inner side wall of the strip-shaped groove to limit the push block to move laterally; the lateral movement of the push block can cause the side turning of the slide block. The reset spring is sleeved on the fulcrum shaft, and the bottom end of the reset spring is propped against the sliding block;

the application of force is under the portion state of wrenching, and the first teeth of a cogwheel of second teeth of a cogwheel drive, and first pendulum rod rotates to make the pivot rotate, and then the second pendulum rod rotates, and first pendulum rod and second pendulum rod drive the axostylus axostyle simultaneously, force the axostylus axostyle to break away from the recess, and the mounting bracket breaks away from the bed frame, and simultaneously, the first drive division drive ejector pad rebound of first pendulum rod, and ejector pad drive slider makes the slider act on output gear, and output gear rotates and drives and move the sword return.

The width of the gear teeth of the output gear is sequentially increased or decreased along the annular outer circumference of the output gear, and correspondingly, the slider has an inclined portion which is in contact engagement with the gear teeth of the output gear and which protrudes laterally outward. The design can guarantee that the sliding block can be reset smoothly without influencing the normal rotation of the output gear.

Preferably, the middle part of the slider is provided with a waist-shaped hole, and the fulcrum shaft penetrates through the waist-shaped hole and moves transversely relative to the waist-shaped hole.

In order to enable the shaft lever to smoothly drive the rubber roller to be separated from the base frame, the shaft lever is provided with a rubber roller support, two ends of the rubber roller support extend upwards to be provided with supporting parts, and the rubber roller assembly can be rotatably arranged on the supporting parts.

Preferably, the transmission gear set includes a driving gear, an intermediate gear and an output gear, the intermediate gear is a duplicate gear, two ends of the intermediate gear are respectively engaged with the driving gear and the output gear, the intermediate gear is rotatably disposed on a support shaft of a gear bracket, the gear bracket is disposed on the base frame and can rotate around a fulcrum, and the first swing rod drives the gear bracket to rotate and enables the intermediate gear to be disengaged from the driving gear in a pressing state of the pulling part. After the first swing rod rotates, the gear bracket can be driven to drive the intermediate gear to be separated from the driving gear, power transmission of the movable knife is cut off, smoothness of pushing the movable knife to return is guaranteed, and safety of operators can be guaranteed.

The output gear can be rotatably arranged on the supporting shaft of the base frame, correspondingly, the gear support is provided with a shaft hole for the supporting shaft to penetrate through, the gear support can rotate by taking the shaft hole as a central fulcrum, the lower end of the gear support is provided with a stress part, and correspondingly, the first swing rod is provided with a second driving part which is matched with the stress part to drive the gear support to rotate.

Furthermore, the gear bracket is provided with a limiting part for limiting the transverse movement of the sliding block.

In order to enable the movable knife to move stably, the two ends of the movable knife are respectively provided with a rack part, correspondingly, the other end of the supporting shaft is provided with an auxiliary gear which is in meshing transmission with the rack parts, and the auxiliary gear can drive the rack parts synchronously with the output gear.

Furthermore, a prying part extends outwards from the first swing rod; the first swing rod can drive the second swing rod through the rotating shaft and can synchronously rotate, and the prying part and the second swing rod can simultaneously act on the driving shaft rod when the pulling part is pressed.

Furthermore, the two sides of the base frame are respectively provided with a groove for the shaft lever to be arranged, and the first swing rod and the second swing rod are respectively arranged close to the grooves.

The push block extends upwards to form a convex part, and correspondingly, the bottom of the slide block is provided with a concave limiting area in limiting fit with the convex part. Both sides all obtain spacingly, further prevent that the slider from turning on one's side at the removal in-process, ensure to move smoothly, the reaction is sensitive. The inner side surface of the blocking part is an inclined surface, and correspondingly, one side of the sliding block is also an inclined surface matched with the inner side surface of the blocking part. When the push block moves forward, the inclined plane of the blocking part props against the slide block, the slide block cannot move downwards, and when the push block moves backwards, the inclined plane matching structure can also provide space for the slide block to move downwards.

Compared with the prior art, the invention has the advantages that: the handle is pressed down, the handle drives the first swing rod to rotate, the first swing rod pushes the push block to move, the push block acts on the sliding block, the sliding block pushes the output gear to rotate after moving, the output gear rotates to push the rack portion to move backwards, and the rack portion is a part of the movable knife, so that the movable knife finally returns. Even if meet the condition of cutter card paper, the existence of slider can accomplish the drive smoothly and move the sword return, stops to move the sword and can not roll back, and the condition that the function became invalid takes place. In addition, the upper blocking part of the push block is abutted against the inner side wall of the strip-shaped groove, so that the side turning of the slide block caused by the side shifting of the push block can be avoided.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment.

Fig. 2 is a state view after the base frame portion and the mount frame portion are detached.

Fig. 3 is an assembly view of the portion of the mounting bracket of fig. 2 from another perspective.

Fig. 4 is an exploded view of fig. 3.

Fig. 5 is an exploded view of the base portion of fig. 2.

Fig. 6 is a schematic view of the assembly structure of the gear set with the base frame partially removed.

Fig. 7 is a cross-sectional view of the base portion of fig. 6.

Fig. 8 is an enlarged view of the first swing link.

Fig. 9 is an enlarged view of the output gear.

Fig. 10 is an enlarged view of the handle.

Fig. 11 is an enlarged view of the gear holder.

Fig. 12 is an enlarged view of the drive assembly of fig. 5.

Fig. 13 is an exploded view of fig. 12.

FIG. 14 is another structural diagram of the slider of FIG. 13.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1, 2, and 3, the thermal printer movement in the present embodiment includes a base frame portion 1a and a mount frame portion 1 b. The mounting frame 11b is provided on the base frame 1 by a detaching mechanism.

As shown in fig. 3 and 4, the mount section 1b includes a mount, a rubber roller assembly, a shaft, and a rubber roller holder. The shaft rod 15b, the glue roller assembly 12b is rotatably arranged on the mounting frame 11b through the glue roller shaft 122b, and the shaft rod 15b is arranged on the mounting frame 11b and is parallel to the glue roller shaft 122 b; the shaft lever 15b is provided with a rubber roller bracket 13b, two ends of the rubber roller bracket 13b extend upwards to be provided with supporting parts 14b, and the rubber roller assembly 12b is rotatably arranged on the supporting parts 14 b.

As shown in fig. 5, 6 and 7, the base frame mainly includes a base frame 1, a print head 2, a movable blade 7, a transmission gear set 5 and a driving assembly 6. The print head 2 is provided on the base frame 1. The base frame 1 in this embodiment is assembled by a main body frame 11, a cover plate 12 and a top plate 13.

As shown in fig. 5, 6 and 7, the transmission gear set 5 in this embodiment includes a transmission gear set 5 including a driving gear 51, an intermediate gear 52 and an output gear 53, the intermediate gear 52 is a duplicate gear, two ends of the intermediate gear are respectively engaged with the driving gear 51 and the output gear 53, and the output gear 53 is engaged with a rack portion 71 on one side of the movable blade 7. The drive gear 51 here is driven by an electric motor not shown. The movable blade 7 has rack portions 71 at both ends thereof, and correspondingly, the output gear 53 is provided with an auxiliary gear 53a through the support shaft 14 and can be rotated synchronously. The auxiliary gear 53a is also in meshing transmission with one of the rack portions 71.

Referring to fig. 5, 8 and 10, the detaching mechanism in this embodiment includes a rotating shaft 41c, a first swing link 4, a second swing link 4c, a handle 3, a reset member 9 and a shaft rod 15b, wherein the rotating shaft 41c is rotatably disposed on the base frame 1 parallel to the length direction of the print head 2; a first swing link 4 and a second swing link 4c which can rotate along with the rotating shaft 41c are respectively arranged at two ends, a first gear tooth 41 is formed at one side of the first swing link 4, a first driving part 43 is arranged at one end,

the handle 3 is rotatably arranged on the base frame 1, a second gear tooth 31 which is meshed with the first gear tooth 41 for transmission is formed on the inner side, and the outer end of the handle extends outwards to form a pulling part 32; the reset piece 9 is arranged on the base frame 1 and always forces the rotating shaft 41c to keep an initial state; the return member 9 in this embodiment is a torsion spring.

The shaft rod 15b is arranged on the mounting frame 11b and is parallel to the rubber roll shaft 122 b; grooves 15 for the shaft lever 15b to be arranged are respectively arranged at two sides of the base frame 1, and the first swing link 4 and the second swing link 4c are respectively arranged close to the grooves 15; the base frame 1 further has a limiting groove 16 for the glue roller assembly 12 b.

A strip-shaped groove 111 is formed in the base frame 1, and a driving assembly 6 for driving the output gear 53 to rotate is arranged in the strip-shaped groove 111.

Referring to fig. 5, 12, 13 and 14, the driving assembly 6 of the present embodiment includes a support shaft 61, a pushing block 64, a sliding block 63 and a return spring 62, wherein the support shaft 61 is inserted into the strip-shaped groove 111; the sliding block 63 is sleeved on the support shaft 61 and can move up and down and transversely relative to the support shaft 61, and the bottom surface of the sliding block 63 is abutted against the upper end surface of the pushing block 64; the pushing block 64 can drive the sliding block 63 to move up and down in the up-moving state; one side of the push block 64 is bent upwards to extend a stop portion 641, and the stop portion 641 abuts against the inner side wall of the strip-shaped groove 111 to limit the side movement of the push block 64 to cause the side turning of the slider 63. The push block 64 is fitted in a circular shaft hole of the support shaft 61, so that a certain gap is formed, and if a force is applied to the push block, the push block moves laterally to a certain extent, thereby causing the slider 63 to roll laterally. The stop 641 solves this problem well.

A convex portion 642 extends upwards from the pushing block 64, and correspondingly, the bottom of the sliding block 63 has a concave limiting region 633 which is in limiting fit with the convex portion 642. The protrusion 642 in cooperation with the stop 633 can further prevent the slider 63 from rolling over.

Furthermore, the middle of the slider 63 has a waist-shaped hole 632, and the supporting shaft 61 penetrates through the waist-shaped hole 632 and moves laterally relative to the pushing block 64, that is, the slider 63 moves laterally relative to the pushing block. The return spring 62 is sleeved on the support shaft 61 and the bottom end of the return spring is pressed against the slide block 63. The inner surface of the stopper 641 is an inclined surface, and correspondingly, one side of the slider 631 is also an inclined surface to be engaged with the inner surface of the stopper 641. When the pushing block moves forward, the inclined plane of the blocking part pushes against the sliding block, the sliding block 63 cannot move downwards, and when the pushing block moves backwards, the inclined plane matching structure can also provide space for the sliding block 63 to move downwards to avoid the gear teeth of the output gear 53.

The width of the gear teeth of the output gear 53 is sequentially increased or sequentially decreased along the annular outer circumference of the output gear 53, and accordingly, the slider 63 has an inclined portion 631 contactingly engaged with the gear teeth of the output gear 53, the inclined portion 631 protruding laterally outward.

As shown in fig. 9, the width of the teeth of the output gear 53 is sequentially increased or decreased along the annular outer circumference of the output gear, in the drawing, the

teeth

531, 532, and 533 are sequentially decreased, and the axial hole 534 in the middle of the output gear is a kidney-shaped hole, so that the output gear is movable up and down with respect to the support shaft 14. The slider 6 has an inclined portion 63 which is in contact engagement with the teeth of the output gear 53. The inclined portion 631 protrudes laterally outward. The inclined part 63 can avoid gear teeth by matching with the gear teeth of the output gear 53, and the design can ensure that the normal rotation of the output gear 53 is not influenced while the sliding block can be reset smoothly. The intermediate gear 52 is rotatably provided on the support shaft 81 of the gear bracket 8, the gear bracket 8 is provided on the base frame 1 and is rotatable around a fulcrum, and the first swing lever 4 drives the gear bracket 8 to rotate and disengages the intermediate gear 52 from the driving gear 51 in a state that the pulling part 32 is pressed.

The output gear 53 is rotatably provided on the support shaft 14 of the base frame, and correspondingly, in conjunction with fig. 11, the gear holder 8 has a shaft hole 82 through which the support shaft 14 passes, the gear holder 8 is rotatable about the shaft hole 82 as a center fulcrum, and the lower end of the gear holder 8 has a force receiving portion 84, and correspondingly, the first swing link 4 has a second driving portion 44 which cooperates with the force receiving portion 84 to drive the gear holder 8 to rotate. The gear holder 8 has a stopper 83 for restricting the lateral movement of the slider 63.

As shown in fig. 8, the first swing link 4 extends outward to form a prying portion 42; the first swing link 4 is provided with a driving shaft 41c for driving the second swing link 4c to rotate synchronously, and the levering portion 42 and the second swing link 4c can act on the driving shaft 15b simultaneously when the levering portion 32 is pressed.

When the force is applied to the wrenching part 32, the second gear 31 drives the first gear 41, the first swing link 4 rotates, so that the rotating shaft 41c rotates, the second swing link 4c rotates, the prying part of the first swing link 4 and the second swing link 4c drive the shaft rod 15b at the same time, the shaft rod 15b is forced to be separated from the groove 15, the mounting frame 11b is separated from the base frame 1, meanwhile, the first driving part 43 of the first swing link 4 drives the push block 64, the push block 64 drives the slide block 63, the slide block 63 acts on the output gear 53, and the output gear 53 rotates and drives the movable knife 7 to return. Meanwhile, the second driving portion 44 of the first swing link 4 acts on the stressed portion 84 of the gear bracket 8, so that the gear bracket 8 rotates around the shaft hole 82, the intermediate gear 52 is driven to disengage from the driving gear, and the transmission of the moving blade is cut off. After the external force is removed, the slider 6 returns to the initial position under the force of the return spring 62.

Claims

1. A thermal printer movement comprises a base frame (1), a mounting frame (11b), a printing head (2), a movable cutter (7) and a rubber roller component (12b), wherein the printing head (2) is arranged on the base frame (1), the rubber roller component (12b) is rotatably arranged on the mounting frame (11b) through a rubber roller shaft (122b), the mounting frame (11b) is arranged on the base frame (1) through a detaching mechanism, the mounting frame (11b) is arranged under the state of the base frame (1), the rubber roller (121b) of the rubber roller component (12b) is close to the printing head (2), the movable cutter (7) can be movably arranged on the base frame (1) and at least one end of the movable cutter is provided with a rack part (71), one side of the base frame (1) is provided with a transmission gear set (5), an output gear (53) of the transmission gear set (5) is meshed with the rack part (71) on one side of the movable cutter (7), it is characterized in that the detaching mechanism comprises:

a rotating shaft (41c) rotatably provided on the base frame (1) in parallel with the longitudinal direction of the print head (2); a first swing rod (4) and a second swing rod (4c) which can rotate along with the rotating shaft (41c) are respectively arranged at the two ends of the gear box, a first gear tooth (41) is formed at one side of the first swing rod (4) and a first driving part (43) is arranged at one end of the first swing rod,

the handle (3) is rotatably arranged on the base frame (1), a second gear tooth (31) which is meshed with the first gear tooth (41) for transmission is formed on the inner side of the handle, and the outer end of the handle extends outwards to form a pulling part (32);

a reset piece (9) which is arranged on the base frame (1) and always forces the rotating shaft (41c) to keep an initial state; and

the shaft lever (15b) is arranged on the mounting rack (11b) and is parallel to the rubber roll shaft (122 b);

a strip-shaped groove (111) is formed in the base frame (1), a driving assembly for driving the output gear to rotate is arranged in the strip-shaped groove, the driving assembly comprises a fulcrum shaft (61), a sliding block, a pushing block (64) and a return spring (62), and the fulcrum shaft (61) is inserted into the strip-shaped groove; the sliding block (63) is sleeved on the fulcrum shaft (61) and can move up and down and move transversely relative to the fulcrum shaft (61), the pushing block (64) is sleeved at the bottom end of the fulcrum shaft (61) and is positioned below the sliding block (63), and the pushing block (64) can drive the sliding block (63) to move upwards when moving upwards; one side of the push block (64) is bent upwards to extend a blocking part (641), and the blocking part is abutted against the inner side wall of the strip-shaped groove to limit the push block to move laterally; the reset spring is sleeved on the fulcrum shaft, and the bottom end of the reset spring is propped against the sliding block;

the second gear teeth (31) drive the first gear teeth (41) under the state of applying force to the wrenching part (32), the first swing rod (4) rotates, so that the rotating shaft (41c) rotates, the second swing rod (4c) rotates, the first swing rod (4) and the second swing rod (4c) drive the shaft lever (15b) simultaneously, the shaft lever (15b) is forced to be separated from the groove (15), the mounting frame (11b) is separated from the base frame (1), meanwhile, the first driving part (43) of the first swing rod (4) drives the push block (64) to move upwards, the push block (64) drives the slide block (63), the slide block (63) acts on the output gear (53), and the output gear (53) rotates and drives the movable knife (7) to return.

2. A thermal printer movement according to claim 1, characterised in that the width of the teeth of the output gear (53) increases or decreases successively along the annular periphery of the output gear (53), correspondingly the slide (63) having an inclined portion (631) in contact engagement with the teeth of the output gear (53), the inclined portion (631) projecting laterally outwards.

3. A thermal printer movement according to claim 1, wherein the slider (63) has a slotted hole (632) in the middle, and the fulcrum (61) is disposed through the slotted hole (632) and moves laterally relative thereto.

4. A thermal printer movement according to claim 1, characterised in that the shaft (15b) is provided with a rubber roller holder (13b), two ends of the rubber roller holder (13b) extend upwards to provide support portions (14b), and the rubber roller assembly (12b) is rotatably provided on the support portions (14 b).

5. The thermal printer movement according to claim 1, wherein the transmission gear set (5) includes a driving gear (51), an intermediate gear (52) and an output gear (53), the intermediate gear (52) is a duplicate gear and has two ends respectively engaged with the driving gear (51) and the output gear (53), the intermediate gear (52) is rotatably disposed on a support shaft (81) of a gear bracket (8), the gear bracket (8) is disposed on the base frame (1) and can rotate around a fulcrum, and the first swing link (4) drives the gear bracket (8) to rotate and enables the intermediate gear (52) to be disengaged from the driving gear (51) in a pressing state of the toggle portion (32).

6. A thermal printer movement according to claim 4, characterised in that the output gear (53) is rotatably mounted on a support shaft (14) of the base frame, in that the gear holder (8) has a shaft hole (82) through which the support shaft (14) passes, in that the gear holder (8) is rotatable about the shaft hole (82) as a central fulcrum, in that the lower end of the gear holder (8) has a force-receiving portion (84), and in that the first lever (4) has a second drive portion (44) which cooperates with the force-receiving portion (84) to drive the rotation of the gear holder (8).

7. The thermal printer movement according to claim 1, wherein the moving blade (7) has rack portions (71) at both ends, and correspondingly, the other end of the supporting shaft (14) is provided with an auxiliary gear (53a) meshed with the rack portions, and the auxiliary gear (53a) can drive the rack portions (71) synchronously with the output gear.

8. A thermal printer movement according to claim 1, characterised in that the first lever (4) extends outwardly with a prying portion (42); the first swing rod (4) is provided with a driving second swing rod (4c) through a rotating shaft (41c) and can synchronously rotate, and the prying part (42) and the second swing rod (4c) can simultaneously act on the driving shaft lever (15b) under the pressing state of the wrenching part (32).

9. A thermal printer movement according to claim 1, characterised in that the base frame (1) has, on each of its two sides, a recess (15) for the shaft (15b), the aforementioned first rocker (4) and second rocker (4c) being arranged respectively close to the aforementioned recess (15).

10. The thermal printer movement according to claim 1, wherein the push block (64) has a protrusion (642) extending upward, and correspondingly, the bottom of the slide block (63) has a recessed limit area (633) in limit fit with the protrusion (642), the inner side surface of the blocking portion is an inclined surface, and correspondingly, one side of the slide block is also an inclined surface in fit with the inner side surface of the blocking portion.