CN202805945U

CN202805945U - Thermal printer

Info

Publication number: CN202805945U
Application number: CN 201220538676
Authority: CN
Inventors: 高明; 文志华; 董述恂; 张继刚
Original assignee: Shandong New Beiyang Information Technology Co Ltd
Current assignee: Shandong New Beiyang Information Technology Co Ltd
Priority date: 2012-10-19
Filing date: 2012-10-19
Publication date: 2013-03-20
Anticipated expiration: 2022-10-19

Abstract

The utility model discloses a thermal printer, comprising a rack and a printing mechanism arranged on the rack, wherein the printing mechanism comprises a thermal printing head and a roller, the roller comprises a mandrel and a roller body; and the printing mechanism further comprises two mandrel sleeves which are sleeved at two ends of the mandrel and are fixed along the axial position of the mandrel, and the mandrel sleeves are detachably matched with the rack in clamping manner. According to the thermal printer, the roller can be disassembled from the pedestal by releasing the clamping connection of the mandrel sleeves and the rack in disassembling the roller. Compared with the prior art, the disassembly and assembly of the roller can be realized without any special tool, thus the operation is simple, and the maintenance is convenient.

Description

Thermal printer

Technical field

The utility model relates to a kind of thermal printer.

Background technology

The printing mechanism of thermal printer comprises thermal printer head and the cylinder of tangent setting, and printing paper is from passing between the two.Its intermediate roll can rotate around self axis under the driving of driving mechanism, and the printing paper between thermal printer head and cylinder is by downstream transport, and simultaneously thermal printer head heating forms image and the literal of setting at printing paper.

In order to guarantee print quality, outer general rubber, the plastics etc. of adopting of cylinder have flexible material, because printing paper has different thickness and hardness, after long-time the use, the skin of cylinder is worn easily, affect print quality, so cylinder belongs to consumable accessory, need to change after long-time the use.

In order to address the above problem, application number is that 200510051877.4 Chinese patent discloses a kind of thermal printer with easily detachable roller frame.As shown in Figure 1, the support 83 of thermal printer is fixedly connected with the frame of thermal printer by screw 81; Cylinder 33 is supported by support 83, is in transmission connection with the driving mechanism of thermal printer, under the driving of driving mechanism, can rotate around self axis; When needs are changed cylinder 33, can first knockout screw 81, cylinder 33 is taken off from the frame of thermal printer with support 83, and then unload bottom roll 33 from support 83.

The problem of this roller mounting structure is, installing, all needing to use first the specific purpose tool removal bracket when dismantling cylinder, dismantles cylinder again, therefore, exists complex operation, safeguards inconvenient problem.

The utility model content

The purpose of this utility model is to provide a kind of to be convenient to dismantle, the thermal printer of mounting rotary drum.

For this reason, the utility model provides a kind of thermal printer, comprise frame and the printing mechanism that arranges in frame, wherein, printing mechanism comprises thermal printer head and cylinder, cylinder comprises mandrel and roll body, and comprises and be set in the mandrel two ends and along two fixing axle sleeves of mandrel axial location, and each axle sleeve and frame removably clamping cooperate.

Further, above-mentioned frame comprises the wall that arranges in the printing paper both sides along the paper cross direction, wall comprises the installing hole with opening, the width of opening is less than the diameter of installing hole, axle sleeve be included in the first angle position can by opening enter installing hole and after rotating to the second angle position with the sleeve of installing hole rotary clamping, sleeve is provided with the axial limiting section that cooperates with wall and circumferential limiting section.

Further, the stopper slot of above-mentioned axial limiting section for forming in the sleeve periphery, when axle sleeve cooperated with the frame clamping, wall was arranged in stopper slot.

Further, above-mentioned circumferential limiting section comprises elastic arm and the locating dowel that forms at elastic arm, and wall is provided with locating hole, and locating dowel cooperates with the locating hole grafting when axle sleeve is in the second angle position.

Further, the periphery of above-mentioned sleeve has two tangent planes that are positioned at the sleeve axis both sides and are parallel to each other, and the distance between two tangent planes is suitable with the width of opening.

Further, above-mentioned frame comprises base and the loam cake able to turn on or off with respect to base, and base comprises shell and pedestal, and wall is formed on the pedestal.

Further, also be provided with the earthing member that is connected with mandrel on the above-mentioned frame.

Further, also be provided with paper-ripping cutter on the above-mentioned frame, paper-ripping cutter is positioned at the downstream of cylinder along the paper delivery direction, also is provided with the elasticity earthing member on the frame, wherein, the elasticity earthing member simultaneously with the end of mandrel and paper-ripping cutter butt respectively.

Further, above-mentioned paper-ripping cutter cross section is triangular prism shape.

Further, above-mentioned thermal printer also comprises carbon ribbon mechanism, and carbon ribbon mechanism is arranged on the ribbon holder, and ribbon holder is arranged on the frame, and carbon ribbon mechanism comprises that carbon ribbon is provided axle and carbon ribbon reclaims axle.

The thermal printer that the utility model provides, the mandrel two ends of cylinder are respectively equipped with and the Zuo Bi of frame and the axle sleeve of right wall clamping, and cylinder is supported on the pedestal by two axle sleeves, can rotate around self axis; When the dismounting cylinder, only need to remove the clamping of axle sleeve and Zuo Bi and right wall, cylinder can be disassembled from pedestal.Compared with prior art, the cylinder of the thermal printer that the utility model provides does not need dismounting and the installation of using specific purpose tool can realize cylinder, and is therefore simple to operate, easy to maintenance.

Except purpose described above, feature and advantage, other purpose, feature and the advantage that the utlity model has are described in further detail in connection with accompanying drawing.

Description of drawings

Consist of this specification a part, be used for further understanding accompanying drawing of the present utility model and show preferred embodiment of the present utility model, and be used for illustrating principle of the present utility model with specification.Among the figure:

Fig. 1 is the schematic diagram of thermal printer in the prior art;

Fig. 2 is the longitudinal profile schematic diagram according to the thermal printer of the utility model one embodiment;

Fig. 3 is the structural representation according to the thermal printer of the utility model one embodiment;

Fig. 4 is the partial structurtes schematic diagram according to the pedestal of the thermal printer of the utility model one embodiment;

Fig. 5 is the structural representation according to the drum assembly of the thermal printer of the utility model one embodiment;

Fig. 6 shows according to the axle sleeve of the drum assembly of the thermal printer of the utility model one embodiment and the schematic diagram that cooperates of left wall;

Fig. 7 is that the drum assembly according to the thermal printer of another embodiment of the utility model is installed in the structural representation on the pedestal;

Fig. 8 is the structural representation according to the paper-ripping cutter of the thermal printer of another embodiment of the utility model; And

Fig. 9 is the partial structurtes schematic diagram of pedestal of the thermal printer of another embodiment of the utility model.

Description of reference numerals

100 bases, 200 loam cakes

300 ribbon holders, 1 paper roll supporting mechanism

2 printing mechanisms, 3 carbon ribbon mechanisms

4 print head assemblies, 5 drum assemblies

6 paper-ripping cutters, 11 shells

12 pedestals, 31 carbon ribbons are provided axle

32 carbon ribbons reclaim axle 41 bracing frames

42 printheads, 51 cylinders

52 axle sleeves, 53 gears

54 earthing members, 61 cutter hubs

62 first installation portions, 63 second installation portions

121 left wall 122 right walls

123 installing holes, 124 locating holes

125 openings, 126 breach

511 mandrels, 512 roll bodies

511a step 521 sleeves

522 elastic arms, 523 locating dowels

524 stopper slots, 525 tangent planes

611 blades, 21 mandrels.

The specific embodiment

Below in conjunction with accompanying drawing embodiment of the present utility model is elaborated, but the multitude of different ways that the utility model can be defined by the claims and cover is implemented.

Fig. 2 is the longitudinal profile schematic diagram according to the thermal printer of the utility model one embodiment, and Fig. 3 is the structural representation according to the thermal printer of the utility model one embodiment.Such as Fig. 2, shown in Figure 3, thermal printer is thermal transfer printer in the present embodiment, comprises base 100, loam cake 200, ribbon holder 300, paper roll supporting mechanism 1, printing mechanism 2, and carbon ribbon mechanism 3.

Wherein, base 100 comprises shell 11 and pedestal 12, and pedestal 12 is positioned at the inside of shell 11, and both are fixedly connected with; Loam cake 200 articulates by drive-connecting shaft A with shell 11 or the pedestal 12 of base 100, can be with respect to base 100 Unscrews or closure, ribbon holder 300 also articulates with base 100 shells 11 or pedestal 12, can be with respect to base 100 Unscrews or closure.Open direction along loam cake 200, ribbon holder 300 is between the pedestal 12 and loam cake 200 of base 100.

Paper roll supporting mechanism 1 is arranged on the pedestal 12 of base 100, is used for holding, supporting the paper roll of printing usefulness.Paper roll supporting mechanism 1 can be paper storehouse or paper roll bracing frame, and in the present embodiment, paper roll supporting mechanism 1 is the paper storehouse.

Along the printing paper throughput direction, printing mechanism 2 is positioned at the downstream of paper roll supporting mechanism 1, is used for printing predefined content at printing paper.Printing mechanism 2 comprises print head assembly 4 and drum assembly 5, and wherein, print head assembly 4 is arranged on the ribbon holder 300, and print head assembly 4 comprises bracing frame 41 and printhead 42, and bracing frame 41 is connected with ribbon holder 300, and printhead 42 is arranged on the bracing frame 41; Drum assembly 5 is arranged on the pedestal 12 of base 100, when ribbon holder 300 relative base 100 closure, the printhead 42 of printing mechanism 2 is tangent with the cylinder 51 of drum assembly 5, when ribbon holder 300 was opened with respect to base, the printhead 42 of printing mechanism 2 separated with the cylinder 51 of drum assembly 5.

Carbon ribbon mechanism 3 is arranged on the ribbon holder 300, is positioned at the opposite side of print head assembly 4 with respect to drum assembly 5.Carbon ribbon mechanism 3 comprises that carbon ribbon is provided axle 31 and carbon ribbon reclaims axle 32, and when ribbon holder 300 was closed with respect to base 100, it is all parallel with the axis of the cylinder 51 of drum assembly 5 that carbon ribbon is provided axis that axle 31 and carbon ribbon reclaim axle 32.Wherein, carbon ribbon is provided axle 31 and is used for supporting unworn carbon ribbon, and carbon ribbon reclaims axle 32 and is used for supporting and the used carbon ribbon of backrush.Untapped carbon ribbon is installed in carbon ribbon and provides on the axle 31, and provides axle 31 from carbon ribbon and draw, and after warp between printhead 42 and the cylinder 51, is wrapped in carbon ribbon and reclaims on the axle 32.

Fig. 4 is the partial structurtes schematic diagram according to the pedestal of the thermal printer of the utility model one embodiment, Fig. 5 is the structural representation according to the drum assembly of the thermal printer of the utility model one embodiment, and Fig. 6 shows according to the axle sleeve of the drum assembly of the thermal printer of the utility model one embodiment and the schematic diagram that cooperates of left wall.Introduce the annexation of drum assembly 5 and pedestal 12 below in conjunction with Fig. 4 to Fig. 6.

As shown in Figure 4, pedestal 12 comprises left wall 121 and the right wall 122 that opposing parallel arranges, and distance between the two is greater than the Breadth Maximum of the printing paper of thermal printer support; Be provided with installing hole 123 and locating hole 124 with opening 125 at left wall 121 and right wall 122, and the installing hole 123 on the left wall 121 and locating hole 124 respectively and the installing hole on the right wall 122 123 and locating hole 124 arrange about the width Central Symmetry between left wall 121 and the right wall 122, installing hole 123 on left wall 121 and the right wall 122 and locating hole 124 interval preset distances arrange, wherein, installing hole 123 is used for back-up roller assembly 5, and limiting drum assembly 5 along the movement of its axis direction, locating hole 124 is used for the axle sleeve 52 of restriction drum assembly 5 around the rotation of its axis.

As shown in Figure 5, drum assembly 5 is supported by the pedestal 12 of base 100, comprises cylinder 51 and two axle sleeves 52.Wherein, cylinder 51 comprises mandrel 511 and roll body 512, and the axis of mandrel 511 extends along the width of printing paper; Roll body 512 and mandrel 511 coaxial being fixedly connected with extend axially along mandrel 21, and the Breadth Maximum of its length and printing paper is suitable.When the ribbon holder 300 of thermal printer is closed with respect to base 100, roll body 512 and 42 tangent cooperations of printhead; End at mandrel 511 also is fixedly installed gear 53, is used for being in transmission connection with the driving mechanism of thermal printer, and under the driving of the driving mechanism of thermal printer, mandrel 511 relatively pedestal 12 rotates around self axis, drives simultaneously thereupon synchronously rotation of roll body 512.

Two axle sleeves 52 are socketed in respectively mandrel 511 two ends of cylinder 51, and by cooperating with the limiting section that arranges on the mandrel 511, it is close to printing paper width center along cylinder 51 axis to limit 52 continuation of two axle sleeves.Limiting section can be the step of multidiameter or split washer etc.Present embodiment, limiting section are arranged on the step 511a of multidiameter at mandrel 511 two ends of cylinder 51.Drum assembly 5 cooperates with

left wall

121 and 122 grafting of right wall of pedestal 12 respectively by two axle sleeves 52.

The below introduces the annexation of axle sleeve 52 and You Bi and left wall as example take the axle sleeve 52 that cooperates with right wall 122.

As shown in Figure 5, axle sleeve 52 comprises sleeve 521, axial limiting section and circumferential limiting section.Wherein, the diameter of the mandrel 511 of the internal diameter of sleeve 521 and cylinder 51 is suitable, and the mandrel 511 of cylinder 51 can be with respect to sleeve 521 around self axis rotation; The diameter of the installing hole 123 of the external diameter of sleeve 521 and right wall 122 is suitable, both cooperations of pegging graft, be provided with symmetrically two tangent planes in the outer rim of sleeve 521 about the axis of sleeve 521, and opening 125 width of the width between two tangent planes and installing hole 123 are suitable; The stopper slot 524 of axial limiting section for forming in sleeve 521 peripheries, stopper slot 524 extends along the outer rim of sleeve 521, its groove width is extended along the axis direction of sleeve 521, and suitable with the wall thickness of right wall 122, when axle sleeve 52 cooperates with right wall 122 clampings, right wall 122 is arranged in stopper slot 524, can make axle sleeve 52 with respect to the location positioning of pedestal 12 at its axis direction, prevents that axle sleeve 52 from moving along its axis direction; Circumferentially limiting section comprises elastic arm 522 and the locating dowel 523 that forms at elastic arm 522, and wherein, elastic arm 522 extends along the direction perpendicular to two tangent planes, and the one end is fixedly connected with sleeve 521, and the other end is unsettled; Locating dowel 523 is used for restriction axle sleeve 52 around the rotation of its axis, locating dowel 523 is positioned at the free end of elastic arm 522, its axis is parallel to the axis of sleeve 521, the internal diameter of the locating hole 124 on its external diameter and the right wall 122 is suitable, after sleeve 521 and installing hole 123 were pegged graft and rotated set angle, locating dowel 523 can be pegged graft with locating hole 124 and be cooperated

With the axle sleeve 52 of the right-hand member socket of the mandrel 511 of cylinder 51 by sleeve 521 and the installing hole 123 on the right wall 122 peg graft, stopper slot 524 is pegged graft with right wall 122 and locating dowel 523 is pegged graft with the locating hole 124 on the right wall 122, thereby axle sleeve 52 is fixed with respect to the position of right wall 122; With the axle sleeve 52 of the left end socket of the mandrel 511 of cylinder 51 by sleeve 521 and the installing hole 123 on the left wall 121 peg graft, stopper slot 524 is pegged graft with left wall 121 and locating dowel 523 is pegged graft with the locating hole 124 on the left wall 121, thereby axle sleeve 52 is fixed with respect to the position of left wall 121, simultaneously, two axle sleeves 52 cooperate with the limiting section that mandrel 511 two ends arrange respectively, limiting section restriction axle sleeve 52 continues close to printing paper width center along cylinder 51 axis, therefore, cylinder 51 is supported on the pedestal 12 by two axle sleeves 52, and this moment, cylinder 51 can rotate around self axis.

The below introduces dismounting and the installation process of the drum assembly that the utility model provides.

Spur at first respectively the elastic arm 522 of two axle sleeves 52, the locating dowel 523 that makes the cantilever end that is positioned at two elastic arms 522 is separated with locating hole 124 on the right wall 122 with left wall 121 respectively, then rotate two axle sleeves 52, two tangent planes separately that make two axle sleeves 52 are corresponding with the opening of installing hole 123 on left wall 121 and the right wall 122 respectively, take off drum assembly 5 from opening part, then take off two axle sleeves 52 along axis respectively from cylinder 51, can more renew cylinder this moment.

When mounting rotary drum assembly 5, at first cooperate with cylinder 51 sockets respectively from two ends with two axle sleeves 52, and two axle sleeves 52 are contacted respectively with limiting section on the cylinder 51, then make on two axle sleeves 52 of drum assembly 5 stopper slot 524 respectively with left wall 121 and the 122 relative grafting of right wall, make two tangent planes 525 on two axle sleeves 52 corresponding with the opening of installing hole 123 on left wall 121 and the right wall 122 respectively, then be installed in the corresponding installing hole 123 along the sleeve 521 of opening 125 with two axle sleeves 52, then rotate respectively two axle sleeves 52, make two locating dowels 523 on the axle sleeve 52 corresponding with the locating hole 124 on left wall 121 and the right wall 122 respectively, under the elastic force effect of elastic arm 522, the locating dowel 523 of two axle sleeves 52 respectively with left wall 121 and right wall 122 on locating hole 124 peg graft and cooperate, two axle sleeves 52 are fixed with respect to left wall 121 and right wall 122 positions, at this moment, gear 53 is in transmission connection with driving mechanism, and cylinder 51 can rotate around self axis under the driving of driving mechanism.

The drum assembly of the thermal printer that the utility model provides, comprise cylinder, and be positioned at cylinder the mandrel two ends and with two axle sleeves of mandrel socket, when drum assembly is installed on the pedestal, two axle sleeves are pegged graft with the Zuo Bi of pedestal and the installing hole of right wall respectively, stopper slot on two axle sleeves is pegged graft with Zuo Bi and the right wall of pedestal respectively, and the locating dowel on two axle sleeves is pegged graft with the Zuo Bi of pedestal and the locating hole of right wall respectively, two axle sleeves are fixed with respect to Zuo Bi and the You Bi position of pedestal, cylinder is supported on the pedestal by two axle sleeves, can rotate around self axis; When the dismounting cylinder, only need to pull the elastic arm of two axle sleeves, locating dowel on the elastic arm of two axle sleeves is separated with the Zuo Bi of pedestal and the locating hole of right wall respectively, then rotate respectively two axle sleeves, make the opening on the installing hole that two axle sleeves, two tangent planes separately are mated relative, along opening direction traveling roller assembly, drum assembly can be disassembled from pedestal, then from cylinder, take off two axle sleeves along axis.The cylinder mounting means of the thermal printer that the utility model provides compared with prior art, does not need dismounting and the installation of using specific purpose tool can realize cylinder, and is therefore simple to operate, easy to maintenance.

Fig. 7 is that the drum assembly according to the thermal printer of another embodiment of the utility model is installed in the structural representation on the pedestal.As shown in Figure 7, present embodiment is compared with a upper embodiment, and difference is that present embodiment intermediate roll assembly 5 also comprises earthing member 54.

Earthing member 54 is positioned at an end of cylinder 51, and the one end is fixedly connected with metal parts (not shown) on the pedestal 12, and the other end is connected with the mandrel 511 of cylinder 51, and the static that is used for being accumulated on the cylinder 51 is derived.In the present embodiment, earthing member 54 is positioned at the end away from gear 53 of cylinder 51, and its material can be derived the static that is accumulated on the cylinder by earthing member for having flexible metal, thereby can avoid the printhead malfunction that causes because of accumulation of static electricity.

Further, thermal printer also comprises paper-ripping cutter 6.Along printing paper paper delivery direction, paper-ripping cutter 6 is positioned at the downstream of drum assembly 5, pegs graft with left wall 121 and the right wall 122 of pedestal 12 respectively in its two ends.

Fig. 8 is the structural representation according to the paper-ripping cutter of the thermal printer of another embodiment of the utility model, and Fig. 9 is the partial structurtes schematic diagram of pedestal of the thermal printer of another embodiment of the utility model.Such as Fig. 8, shown in Figure 9, paper-ripping cutter 6 comprises cutter hub 61, is positioned at the first installation portion 62 and second installation portion 63 at cutter hub 61 two ends, wherein, cutter hub 61 is between the left wall 121 and right wall 122 of pedestal 12, extend along the printing paper width, the blade 611 of cutter hub 61 can contact with the printing paper from drum assembly 5 outputs; Preferably, the cross sectional shape of cutter hub 61 is triangular prism shape, and blade 611 is arranged on triangular prism and the corner angle that printing paper contacts.

The first installation portion 62 be used for right wall 122 on breach 126 peg graft, its length forms step greater than both wall thickness sums of left wall 121 and right wall 122 between the first installation portion 62 and the cutter hub 61; The second installation portion 63 be used for left wall 121 on breach 126 peg graft, the wall thickness of its length and left wall 121 is suitable, forms step between the second installation portion 63 and the cutter hub 61.

When paper-ripping cutter 6 is installed, at first with the breach 126 on the right wall 122 of the first installation portion 62 insertion pedestals 12, the first installation portion 62 is contacted with right wall 122 with step between the cutter hub 61, at this moment, because the length sum of cutter hub 61 and the second installation portion 63 is less than the width between left wall 121 and the right wall 122, therefore, make the second installation portion 63 relative with breach 126 on the left wall 121, and wall 121 directions move paper-ripping cutter 6 left, and the second installation portion 63 of paper-ripping cutter 6 is inserted in the breach 126 on the left wall 121; One end of earthing member 54 is fixedly connected with right wall 122, and the other end is connected with the mandrel 511 of cylinder 51, and with the end face butt of paper-ripping cutter 6, restriction paper-ripping cutter 6 is along the movement of its length direction.Have flexible earthing member by setting in the present embodiment, not only the static that is accumulated on the paper-ripping cutter can be derived, but also can realize that the position of paper-ripping cutter fixes.

The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims

1. thermal printer, the printing mechanism that comprises frame and arrange in described frame (2), wherein, described printing mechanism (2) comprises thermal printer head (42) and cylinder (51), described cylinder (51) comprises mandrel (511) and roll body (512), it is characterized in that, comprise also being set in described mandrel (511) two ends and along fixing two axle sleeves (52) of described mandrel (511) axial location that each described axle sleeve (52) and described frame removably clamping cooperate.

2. thermal printer according to claim 1 is characterized in that, described frame comprises the wall (121 that arranges in the printing paper both sides along the paper cross direction; 122), described wall (121; 122) comprise the have opening installing hole (123) of (125), the width of described opening (125) is less than the diameter of described installing hole (123), described axle sleeve (52) be included in the first angle position can by described opening (125) enter described installing hole (123) and after rotating to the second angle position with the sleeve (521) of described installing hole (123) rotary clamping, described sleeve (521) is provided with and described wall (121; 122) the axial limiting section that cooperates and circumferential limiting section.

3. thermal printer according to claim 2 is characterized in that, the stopper slot of described axial limiting section for forming in described sleeve periphery, and when described axle sleeve cooperated with described frame clamping, described wall was arranged in described stopper slot.

4. thermal printer according to claim 2 is characterized in that, described circumferential limiting section comprises elastic arm (522) and the locating dowel (523) that forms at described elastic arm (522), described wall (121; 122) be provided with locating hole (124), described locating dowel (523) cooperates with described locating hole (124) grafting when being in described the second angle position at described axle sleeve (52).

5. thermal printer according to claim 2, it is characterized in that, the periphery of described sleeve (521) has two tangent planes (525) that are positioned at described sleeve (521) axis both sides and are parallel to each other, and the distance between described two tangent planes (525) is suitable with the width of described opening (125).

6. thermal printer according to claim 2, it is characterized in that, described frame comprises base (100) and the loam cake (200) able to turn on or off with respect to described base (100), described base (100) comprises shell (11) and pedestal (12), described wall (121; 122) be formed on the described pedestal (12).

7. thermal printer according to claim 1 is characterized in that, also is provided with the earthing member (54) that is connected with described mandrel (511) on the described frame.

8. thermal printer according to claim 1, it is characterized in that, also be provided with paper-ripping cutter (6) on the described frame, described paper-ripping cutter (6) is positioned at the downstream of described cylinder (51) along the paper delivery direction, also be provided with the elasticity earthing member on the described frame, wherein, described elasticity earthing member is distinguished butt with the end of described mandrel (511) and described paper-ripping cutter (6) simultaneously.

9. thermal printer according to claim 8 is characterized in that, described paper-ripping cutter (6) cross section is triangular prism shape.

10. thermal printer according to claim 1, it is characterized in that, also comprise carbon ribbon mechanism (3), described carbon ribbon mechanism (3) is arranged on the ribbon holder (300), described ribbon holder (300) is arranged on the frame, and described carbon ribbon mechanism (3) comprises that carbon ribbon is provided axle (31) and carbon ribbon reclaims axle (32).