Thermal printer

Abstract

The utility model discloses a thermal printer which comprises a printer body, a printer rubber roller side assembly fixed on the printer body and a printing head sheet side assembly hinged to the printer body or the printer rubber roller side assembly, and the printer rubber roller side assembly is provided with a connecting shaft and a first clamping hook. The first clamping hook is provided with an upper hook part, a lower hook part and a shifting part, the upper hook part and the lower hook part are rotationally installed at the upper end and the lower end of the connecting shaft respectively, and the shifting part is located on one side of the middle of the connecting shaft; the printing head sheet side assembly is provided with two second clamping hooks; the first clamping hook is provided with a button, and the button is provided with a bevel edge used for abutting against the shifting part to drive the first clamping hook to rotate. The acting point of the button on the first clamping hook is located in the middle of the first clamping hook, the distance difference between the two hook parts of the first clamping hook and the force acting point when the button is pressed is small, and therefore it is guaranteed that the two hook parts act synchronously to achieve hooking or unhooking.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of printer, concretely relates to a thermal printer. BACKGROUND

[0002] The working principle of the thermal printer is that the printer rubber roller presses the paper on the plane where the heating unit of the print head piece is located, the printer rubber roller drives the paper to advance, the heating unit in the print head piece heats according to the printing information content under the control of the printing control program, and the corresponding information content is displayed at the corresponding position of the thermal paper, so that the printing of the thermal printer is realized. The key factor of the printing effect of the thermal printer is the fitting accuracy of the print head piece and the rubber roller, and the theoretically best effect is that the position of the printing heating unit in the print head piece is tangent to the outer diameter of the printer rubber roller.

[0003] The thermal printer disclosed in the patent CN219856499U can accurately position the heating unit position of the print head piece and the position tangent to the outer diameter of the rubber roller, but its disadvantage is that the driving button is pressed on the first clamping hook at one end of the connecting shaft of the printer rubber roller side assembly, the torque difference between the two first clamping hooks and the button is large, when the driving button is pressed, the pressing force received by the first clamping hooks at both ends of the connecting shaft is different, and the first clamping hook close to the driving button and the corresponding second clamping hook on the print head piece side assembly are smoothly hooked and closed, but the first clamping hook away from the driving button cannot be hooked and closed with the corresponding second clamping hook on the print head piece side assembly, which will cause the heating unit position of the print head piece and the outer diameter of the rubber roller to be unable to be closely coincided, thereby causing the printing failure. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of the prior art, the utility model provides a thermal printer, which mainly solves the problem that the clamping hooks at both ends of the printer rubber roller side assembly of the existing printer cannot be synchronously closed to hook the corresponding clamping hooks on the print head piece side assembly, resulting in printing failure.

[0005] To achieve the above purpose, the utility model is realized by the following technical scheme:

[0006] The utility model provides a thermal printer, including printer body, printer rubber roller side subassembly fixed on printer body and print head piece side subassembly articulated on printer body or printer rubber roller side subassembly, define the axial direction of rubber roller of printer rubber roller side subassembly as up and down direction, the rubber roller side subassembly has connecting shaft and first catch, first catch has two hook parts of up and down and a dialing part, two hook parts of up and down are respectively rotatoryly installed on the up and down both ends of connecting shaft, and dialing part is located one side of the middle part of connecting shaft, print head piece side subassembly has two second catches, and two second catches are distributed up and down, print head piece side subassembly is covered on printer rubber roller side subassembly and is fixed through two hook parts of first catch and two second catches, and first catch is provided with elastic element, and the elastic element exerts the force of keeping hooking to first catch, and first catch is provided with button, and the button has the bevel for abutting on dialing part to drive first catch to rotate.

[0007] As a kind of preferred, first catch includes two opposite horizontal sections and a vertical section, two hook parts are located on two horizontal sections respectively, and two horizontal sections are connected to the upper and lower ends of vertical section respectively, and dialing part is connected to the middle part of vertical section away from two hook parts side;Two horizontal sections are provided with through hole, and two horizontal sections are respectively movably sleeved on the both ends of connecting shaft through through hole.

[0008] As a kind of preferred, first catch is integrally formed by bending sheet metal part.

[0009] As a kind of preferred, the elastic element is a tension spring, one end of the tension spring is fixed on the dialing part, and the other end is fixed on the printer body or fixed on the fixed part of the printer rubber roller side subassembly.

[0010] As a kind of preferred, the button is provided with a tension spring for driving the button to reset, one end of the tension spring is fixed on the button, and the other end is fixed on the printer body or fixed on the fixed part of the printer rubber roller side subassembly.

[0011] The thermal printer provided by the utility model has the following beneficial effects:

[0012] The first catch of the printer rubber roller side subassembly has a dialing part on one side of the middle part of the connecting shaft, and the bevel of the button abuts on the dialing part, that is, the action point of the button on the first catch is located in the middle part of the first catch, and when the first catch rotates, the hook parts at both ends are driven to rotate to hook the two second catches on the print head piece side subassembly. The button acts on the middle part of the first catch instead of one end of the first catch, and the distance difference between the two hook parts of the first catch and the action point of the force when the button is pressed is small, so that synchronous action of the two hook parts is ensured to realize hooking or unhooking. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1is a printing head piece and rubber roller adhering position schematic view of the thermal printer of the embodiment of the utility model;

[0014] Figure 2 is a three-dimensional schematic view when the first and second clamping hooks of the thermal printer of the embodiment of the utility model are separated;

[0015] Figure 3 is a three-dimensional schematic view when the first and second clamping hooks of the thermal printer of the embodiment of the utility model are separated;

[0016] Figure 4 is a sectional view when the first and second clamping hooks of the thermal printer of the embodiment of the utility model are separated;

[0017] Figure 5 is a sectional view when the first and second clamping hooks of the thermal printer of the embodiment of the utility model are separated;

[0018] Figure 6 is a position schematic view of the button and the first clamping hook when the button is in the reset state of the embodiment of the utility model;

[0019] Figure 7 is a schematic view of the button pressing the first clamping hook, and at this time the first clamping hook is in the unhooked state. DETAILED DESCRIPTION

[0020] The utility model will be further described below in combination with the drawings and embodiments.

[0021] In the description of the utility model, it needs to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0022] As Figures 1 to 7 shown, the embodiment discloses a thermal printer, which comprises a printer body, a printer rubber roller side assembly 1 fixed on the printer body, and a printing head piece side assembly 2 hinged on the printer body or the printer rubber roller side assembly 1. Specifically, the printing head piece side assembly 2 is hinged on the printer body through a rotating shaft (of course, in other embodiments, the printing head piece side assembly 2 can also be hinged on the printer rubber roller side assembly 1). Specifically, the printer rubber roller 3 side assembly has a rubber roller 3, and the printing head piece side assembly 2 has a printing head piece, and a heating unit is arranged on the printing head piece; the arrangement of the rubber roller 3 and the printing head piece is prior art, which will not be described in detail here.

[0023] The axial direction of the rubber roller 3 of the printer rubber roller side assembly 1 is defined as the up-down direction, the printer rubber roller side assembly 1 has a connecting shaft 4 and a first hook 5, the first hook 5 has two up-down hooks 51 and a pushing part 52, the two up-down hooks 51 are respectively rotatably installed on the up-down two ends of the connecting shaft 4, and the pushing part 52 is located on one side of the middle part of the connecting shaft 4; the print head piece side assembly 2 has two second hooks 6, and the two second hooks are distributed up-down; the print head piece side assembly 2 is covered on the printer rubber roller side assembly 1 and is fixed by the two hooks 51 of the first hook 5 and the two second hooks 6. The first hook 5 is provided with an elastic element 9, the elastic element 9 applies a force to the first hook 5 to keep the hooks, and the first hook 5 is provided with a button 7, the button 7 has an inclined edge 72 for pressing on the pushing part 52 to drive the first hook 5 to rotate. The first hook 5 of the printer rubber roller side assembly 1 in the embodiment has the pushing part 52 on one side of the middle part of the connecting shaft 4, the inclined edge 72 of the button 7 presses on the pushing part 52, that is, the action point of the button 7 on the first hook 5 is located in the middle part of the first hook 5, and when the first hook 5 rotates, the two hooks 51 at the two ends rotate to hook the two second hooks 6 on the print head piece side assembly 2. The button 7 acts on the middle part of the first hook 5 instead of one end of the first hook 5, the distance difference between the two hooks 51 of the first hook 5 and the force action point of the button 7 when pressed is small, thereby ensuring that the two hooks 51 act synchronously to realize hooking or unhooking.

[0024] In a specific structure, the first hook 5 includes two opposite horizontal sections 53 and a vertical section 54, the two hooks 51 are respectively located on the two horizontal sections 53, the two horizontal sections 53 are respectively connected to the up-down two ends of the vertical section 54, and the pushing part 526 is connected to the middle part of the vertical section 54 away from the two hooks 51. The two horizontal sections 53 are both provided with through holes, the two horizontal sections 53 are respectively movably sleeved on the two ends of the connecting shaft 4 through the through holes, and the vertical section 54 is arranged in parallel on one side of the connecting shaft 4. The first hook 5 rotates around the connecting shaft 4. The first hook 5 is integrally formed by bending a metal sheet, which is beneficial to reducing accessories and simplifying the assembly process.

[0025] In the covered state, the first hook 5 keeps hooking with the second hook 6 under the driving action of the elastic element 9, thereby realizing the fixation of the printer rubber roller side assembly 1 and the print head piece side assembly 2. When separation is needed, the button 7 drives the first hook 5 to unhook, thereby realizing separation, and the operation is simple. Preferably, the elastic element 9 is a tension spring, one end of the tension spring is fixed on the pushing part 52, and the other end is fixed on the printer body or a fixed part of the printer rubber roller side assembly 1. The elastic element 9 is not limited to this, for example, in the embodiment, the elastic element 9 can also be a torsion spring, and the specific installation structure and principle refer to the patent CN219856499U.

[0026] The button 7 is provided with a tension spring 8 for driving the button 7 to reset, one end of the tension spring 8 is fixed on the button 7, and the other end is fixed on the printer body or a fixed part of the printer rubber roller side assembly 1. In the embodiment, the button 7 is arranged on the upper end of the rubber roller 3, the lower end of the tension spring 8 is hooked on the vertical arm 71 of the button 7, and the upper end of the tension spring 8 is hooked on the printer body or fixed on the fixed part of the printer rubber roller side assembly 1. In other embodiments, the reset mode of the button 7 is not limited to this, and other elastic components such as springs and elastic sheets can be used to replace the tension spring 8. The gap between the parts of the printer rubber roller side assembly 1 can be used to accommodate the button 7, or a through hole is formed on a certain fixed part and is sleeved on the button 7, which is used to limit the position of the button 7 and guide the movement track of the button 7, so that the button 7 can only move up and down.

[0027] The printer rubber roller side assembly 1 further has positioning shaft sleeves 10 located at both ends of the rubber roller 3, two positioning shaft sleeves 10 are arranged on the left and right sides of the rubber roller 3 respectively, and are used to position the rubber roller 3; and the two positioning shaft sleeves 10 are both provided with positioning sockets 11. The printhead piece side assembly 2 has two positioning protrusions 12 distributed upwards and downwards. The positioning sockets 11 cooperate with the positioning protrusions 12, and the two positioning protrusions 12 are respectively inserted into the two positioning sockets 11, so that the rubber roller 3 and the printhead piece side assembly 2 can be limited in the paper ejection direction, and the heating unit of the printhead piece of the printhead piece side assembly 2 can be kept in a tangent position. The printhead piece side assembly 2 and the printer rubber roller side assembly 1 are overlapped, and a paper feeding channel 13 is formed between them, and the paper feeding channel 13 is located between the two second clamps 6.

[0028] The above describes only to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, therefore, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

Claims

1. A thermal printer comprising a printer body, a printer rubber roller side assembly fixed to the printer body, and a print head sheet side assembly hinged to the printer body or the printer rubber roller side assembly; the axial direction of a rubber roller defining the printer rubber roller side assembly is defined as the up-down direction, characterized in that: the printer rubber roller side assembly has a connecting shaft and a first clamping hook, the first clamping hook has two up-down clamping portions and a pushing portion, the two up-down clamping portions are respectively rotatably installed on the up-down two ends of the connecting shaft, and the pushing portion is located on one side of the middle part of the connecting shaft; the print head sheet side assembly has two second clamping hooks, and the two second clamping hooks are distributed up-down; the print head sheet side assembly is covered on the printer rubber roller side assembly and is fixed by the two clamping portions of the first clamping hook and the two second clamping hooks; an elastic member is arranged on the first clamping hook, and the elastic member applies a force to the first clamping hook to keep the hooking; the first clamping hook is provided with a button, and the button has an inclined edge for abutting on the pushing portion to drive the first clamping hook to rotate.

2. The thermal printer according to claim 1, characterized by: The first clamping hook includes two opposite horizontal sections and a vertical section, the two clamping portions are respectively located on the two horizontal sections, the two horizontal sections are respectively connected to the up-down two ends of the vertical section, and the pushing portion is connected to the middle part of the vertical section away from the two clamping portions; both the two horizontal sections are provided with through holes, and the two horizontal sections are movably sleeved on the two ends of the connecting shaft through the through holes.

3. The thermal printer according to claim 1, characterized by: The first clamping hook is integrally formed by bending a sheet metal part.

4. The thermal printer according to claim 1 or 2, characterized by: The elastic member is a tension spring, one end of the tension spring is fixed on the pushing portion, and the other end is fixed on the printer body or a fixed part of the printer rubber roller side assembly.

5. The thermal printer according to claim 1, characterized by: A tension spring for driving the button to reset is arranged on the button, one end of the tension spring is fixed on the button, and the other end is fixed on the printer body or a fixed part of the printer rubber roller side assembly.

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