CN213649141U

CN213649141U - Print head mounting structure and have temperature-sensitive printer core of this structure

Info

Publication number: CN213649141U
Application number: CN202021476957.0U
Authority: CN
Inventors: 蒋文柏; 林超艺
Original assignee: NINGBO JINGXIN TECHNOLOGY CO LTD
Current assignee: NINGBO JINGXIN TECHNOLOGY CO LTD
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2021-07-09
Anticipated expiration: 2030-07-23

Abstract

A printing head mounting structure comprises a rack, a printing head assembly, an elastic plate and a spring, wherein the printing head assembly is arranged on the rack in a manner of being parallel to the length direction of a connecting part of the rack; the elastic plate comprises rotating parts at two ends and a supporting part arranged between the rotating parts, the rotating parts can be rotatably arranged on the connecting part of the rack, and the supporting part is arranged in parallel with the printing head assembly; the springs are arranged between the back surface of the printing head component and the elastic plate, and are characterized in that the springs arranged in the middle are larger than the springs arranged on the two sides. The elastic force in the middle is larger than that at the two ends, so that the distribution deviation of the pressure intensity of the transverse contact point of the printing head assembly and the rubber roller is better realized to be smaller, the stress is balanced, and the excellent printing effect is realized.

Description

Print head mounting structure and have temperature-sensitive printer core of this structure

Technical Field

The utility model relates to a thermal printer beats printer head assembly, the utility model discloses still relate to a thermal printer.

Background

The front of the printing head component is parallel along the axial direction of the rubber roller and is regularly arranged in a single row with a plurality of heating resistors at equal intervals, and a corresponding circuit driving program drives the corresponding points to work; the elastic plate is arranged on the frame and is parallel to the printing head assembly; the springs are arranged between the back face of the printing head assembly and the elastic plate, so that the printing head assembly is close to the rubber roller, the power input end of the gear set is in meshed transmission with the output gear of the motor, and the power output end of the gear set is in meshed transmission with the input gear on the rubber roller.

The motor drives the rubber roller to rotate through the gear set, and printing paper is input and output by dragging the printing paper through sliding friction of the diameter of the rubber roller.

Researches show that the smaller the transverse distribution deviation of the local contact pressure of the printing head assembly and the rubber roller is, the better the printing effect is; the biggest production chronic problem of the thermal printer core is that the transverse distribution deviation of the local contact pressure of the printing head assembly and the rubber roller is difficult to ensure to be small enough. At present, the local contact pressure of the printing head assembly and the rubber roller mainly depends on a spring at the back, and the printing quality is influenced between the arrangement and the layout of the spring. The existing springs are multiple, the spring pressure is the same, the distribution error of the printing head assembly in the transverse contact point pressure of the rubber roller is large due to the design, the centering position of the transverse contact pressure distribution and the transverse physical line weighing position offset of the core rubber roller and the printing head assembly are large, the lateral pulling force of paper is caused, and the serious problems that the printing paper continuously sideslips to one side and is jammed when being printed are caused. In addition, the existing spring realizes positioning by means of friction force between the spring and a contact surface, and is easy to displace and deform in the past, and the whole stress of the printing head assembly is difficult to guarantee.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the first technical problem that will solve provides a beat printer head assembly atress even and beat printer head mounting structure to foretell technical situation.

The second technical problem to be solved in the present invention is to provide a thermal printer with a printhead assembly that is evenly stressed in view of the above technical situation.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: a print head mounting structure includes

The rack is provided with mounting parts on two sides and a connecting part positioned between the mounting parts;

the printing head assembly is arranged on the rack in parallel with the length direction of the connecting part;

the elastic plate comprises rotating parts at two ends and a supporting part arranged between the rotating parts, the rotating parts can be rotatably arranged on the connecting part, and the supporting part is arranged in parallel with the printing head assembly; and

and a plurality of springs arranged between the back surface of the printing head assembly and the elastic plate, wherein the springs arranged in the middle part have larger elastic force than the springs arranged at the two sides.

The supporting part is provided with a positioning hole, a pin shaft part is formed at the end part of one end of the spring close to the elastic plate, and the pin shaft part is inserted into the positioning hole. Through the cooperation of round pin axial region and locating hole, firmly be located the spring between elastic plate and printhead assembly, ensure that the printhead assembly atress is stable to guarantee print quality.

Preferably, the other end of the spring is formed with a circular ring portion that abuts against the back surface of the head unit.

Preferably, the spring is a tower spring, and the circular ring part is a base of the tower spring.

The back of the supporting part can be abutted against the connecting part. The spring plate is limited.

Furthermore, at least one of the rotating parts extends outwards to form a pulling part, and the pulling part drives the rotating part to overturn under the force application state so as to further compress the spring.

The utility model provides a technical scheme that above-mentioned first technical problem adopted does: the utility model provides a thermal printer, includes and beats printer head mounting structure, rubber roll, motor and gear train, aforementioned rubber roll can locate on connecting portion and have the input gear through the rubber roll axle can rotate, the front that is close to the printer head subassembly of aforementioned rubber roll, on the installation department of support is located to aforementioned motor, the installation department outside and the power input end of frame and the transmission of motor's output gear meshing are located to aforementioned gear train, power output end and the transmission of aforementioned input gear meshing.

Furthermore, the mounting part is provided with a first groove for arranging a rubber roller shaft, correspondingly, the rotating part is provided with a second groove, one side of the second groove is provided with a hook part for limiting the rubber roller shaft to be separated from the first groove, the other side of at least one of the second grooves is provided with a shifting part, at least one of the rotating parts extends outwards to form a pulling part, and the rubber roller shaft is positioned in the first groove and the second groove and is limited by the hook part when the rubber roller is assembled on the frame; the pulling part drives the rotating part to overturn and further compress the spring under the force application state, and the pulling part acts on the rubber roll shaft and forces the rubber roll shaft to be separated from the first groove.

Compared with the prior art, the utility model has the advantages of: the printing head component and the rubber roller have the physical characteristic that the bending rigidity in the middle is gradually reduced compared with the bending rigidity at two ends in the axial direction, the elastic force in the middle is larger than that at two ends in design, the lateral tension when the rubber roller pulls paper in operation can be better overcome, the automatic centering and reliable operation of the paper can be well ensured, the distribution deviation of the transverse contact point pressure of the printing head component and the rubber roller is better realized, the stress is balanced, and the excellent printing effect is realized.

Drawings

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

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is an enlarged view of a single spring of fig. 2.

FIG. 4 is a schematic view of another embodiment of the present disclosure.

Fig. 5 is an exploded view from another perspective of fig. 4.

FIG. 6 is an enlarged perspective sectional view of one side of the embodiment.

FIG. 7 is an enlarged perspective sectional view of the other side of the embodiment.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1, 2, 4 and 5, the thermal printer in this embodiment includes a frame 1, a rubber roller 4, a print head assembly 2, an elastic plate 6, a plurality of springs 3, a motor 5 and a gear train 52.

The frame 1 is provided with mounting parts 12 at two sides and a connecting part 11 positioned between the mounting parts 12; the printhead module 2 is provided on the frame 1 in parallel with the longitudinal direction of the connecting portion 11.

The elastic plate 6 includes rotation portions 62 at both ends and a support portion 61 disposed between the rotation portions 62, as shown in fig. 6, the rotation portions 62 are rotatably disposed on the connection portion 11 via a shaft pin 8, the support portion 61 is disposed parallel to the printhead module 2, and the support portion 61 has a positioning hole 63 a. The back surface of the support portion 61 can abut against the connecting portion 11.

As shown in fig. 3, the springs 3 are provided between the rear surface of the printhead assembly 2 and the elastic plate 6, and the total number of the springs is four, two of the springs are identical at both sides, and two of the springs are identical at the center, and the two springs 3 disposed at the center are larger than the two springs 3 disposed at both sides. The spring 3 is a tower-shaped spring, a pin 31 is formed at one end of the spring 3 close to the elastic plate 6, and the pin 31 is inserted into the positioning hole 63a to realize positioning. The other end of the spring 3 is formed with an annular portion 32 that abuts the rear surface of the head unit 2. The circular ring portion 32 is a base of the tower spring.

4 spring pressure are the same in the common printer core, and the distribution error that the horizontal contact point pressure of beating printer head assembly and rubber roll can appear in this kind of design is very big, and the centering position that horizontal contact pressure distributes moreover and core rubber roll close printer head assembly's horizontal physics line of title position off normal is very big, causes the side direction pulling force to paper, constantly sideslips to one side when beating printer paper and can print appearing, the serious problem of card paper. The elastic force of the middle spring in the embodiment is designed to be larger than that of the two sides, so that the lateral tension generated when the rubber roller pulls paper in operation can be better overcome, and the automatic centering and reliable operation of the paper can be well ensured; in addition, through the cooperation of round pin axial region and locating hole, firmly be located the spring between elastic plate and printhead assembly, ensure that printhead assembly atress is stable to guarantee print quality.

The rubber roller 4 is rotatably arranged on the connecting part 11 through a rubber roller shaft 42 and is provided with an input gear 43, and a bearing 44 is sleeved on the end part of the rubber roller shaft 42. The rubber roller 4 is close to the front surface of the printing head assembly 2, the motor 5 is arranged on the mounting part 12 of the bracket, the gear set 52 is arranged outside the mounting part 12 of the frame 1, the power input end of the gear set is in meshing transmission with the output gear 51 of the motor 5, and the power output end of the gear set is in meshing transmission with the input gear 43.

Referring to fig. 6 and 7, the mounting portion 12 has a first groove 121 for the glue roller shaft 42 to be disposed thereon, and correspondingly, the rotating portion 62 has a second groove 623, one side of the second groove 623 is provided with a hook 621 which is separated from the first groove 121 by the glue roller shaft 42, the other side of one of the second grooves 623 is provided with a toggle portion 622, and one of the rotating portions 62 extends outward to form a toggle portion 63.

When the rubber roller 4 is assembled on the frame 1, the rubber roller shaft 42 is positioned in the first groove 121 and the second groove 623 and is limited by the hook 621; under the state of the force applied by the pulling portion 63, the rotating portion 62 is driven to turn over and further compress the spring 3, and meanwhile, the pulling portion 622 acts on the glue roller shaft 42 and forces the glue roller shaft 42 to disengage from the first groove 121.

Claims

1. A print head mounting structure includes

A frame (1) having mounting portions (12) on both sides and a connecting portion (11) between the mounting portions (12);

a print head assembly (2) which is arranged on the frame (1) in parallel with the length direction of the connecting part (11);

the elastic plate (6) comprises rotating parts (62) at two ends and supporting parts (61) arranged between the rotating parts (62), the rotating parts (62) can be rotatably arranged on the connecting part (11), and the supporting parts (61) are arranged in parallel to the printing head assembly (2); and

and a plurality of springs (3) provided between the back surface of the printhead assembly (2) and the elastic plate (6), wherein the springs (3) disposed in the middle are larger than the springs (3) disposed on both sides.

2. The printhead mounting structure according to claim 1, wherein the support portion (61) has a positioning hole (63a), and an end portion of the spring (3) near the elastic plate (6) is formed with a pin shaft portion (31), the pin shaft portion (31) being inserted into the positioning hole (63 a).

3. The printhead mounting structure according to claim 2, characterized in that the other end of the spring (3) is formed with a circular ring portion (32) that abuts against the back surface of the printhead assembly (2).

4. A printhead mounting structure according to claim 3 wherein the spring (3) is a tower spring and the annular portion (32) is a base of the tower spring.

5. The print head mounting structure according to claim 1, wherein the back surface of the support portion (61) is capable of abutting against the connecting portion (11).

6. The printhead mounting structure according to claim 1, wherein at least one of the rotating portions (62) has a pulling portion (63) extending outward, and the pulling portion (63) is under a force application state to drive the rotating portion (62) to turn over and further compress the spring (3).

7. A thermal printer with a printing head mounting structure according to any one of claims 1 to 5, comprising a printing head mounting structure, a rubber roller (4), a motor (5) and a gear set (52), wherein the rubber roller (4) can be rotatably arranged on a connecting part (11) through a rubber roller shaft (42) and is provided with an input gear (43), the front side of the rubber roller (4) close to the printing head assembly (2) is provided, the motor (5) is arranged on an installation part (12) of a support, the gear set (52) is arranged on the outer side of the installation part (12) of a rack (1) and is in meshing transmission with a power input end and an output gear (51) of the motor (5), and a power output end is in meshing transmission with the input gear (43).

8. The thermal printer according to claim 7, wherein the mounting portion (12) has a first recess (121) for the glue roller shaft (42), correspondingly, the rotating portion (62) has a second recess (623), one side of the second recess (623) has a hook portion (621) for limiting the glue roller shaft (42) from disengaging from the first recess (121), the other side of at least one of the second recesses (623) has a toggle portion (622), at least one of the rotating portions (62) has a toggle portion (63) extending outwards;

the rubber roller (4) is assembled in the frame (1), and the rubber roller shaft (42) is positioned in the first groove (121) and the second groove (623) and limited by the hook part (621);

under the force application state of the pulling part (63), the rotating part (62) is driven to overturn so as to further compress the spring (3), and meanwhile, the shifting part (622) acts on the rubber roll shaft (42) and forces the rubber roll shaft (42) to be separated from the first groove (121).