A portable printer, a printing mechanism and a printing method thereof

Abstract

The present invention provides a printer mechanism, including a main frame, a head component and a paper feeding component arranged on the main frame, wherein the head component includes a thermal head, a platen roller and a head support plate, and the head support plate drives the thermal head away from or close to the platen roller in a manner of raising or lowering the head; the head component and the paper feeding component are constructed as separate components, and the paper feeding component includes a paper feeding roller and a crimping roller arranged relatively up and down; when the head support plate drives the thermal head away from the platen roller in a manner of raising the head, the head component can apply force to the crimping roller to clamp the recording paper between the crimping roller and the paper feeding roller. The present invention prevents the image surface of the recording paper from being contaminated and improves the image quality through the linkage between the head support plate and the crimping roller. The present invention also provides a portable printer and a printing method of the printer.

Description

Technical Field

[0001] The present invention relates to the technical field of printers, and in particular to a portable printer and a printing mechanism and a printing method thereof. Background Art

[0002] Printing media for thermal printers As the application scenarios of thermal printers diversify, the types of printing media are gradually increasing. Printing media can be divided into two categories according to their form: one is roll paper type and the other is sheet type. According to the application, it can be divided into: thermal paper, label paper, linerless adhesive thermal paper... etc. According to hardness and thickness, it can be divided into hundreds of types. Due to the diversity of printing media, for the same printer, only one printing medium has the best effect when printing multiple printing media, and the printing effects of others will be relatively poor.

[0003] Especially when printing multi-color images, the print medium needs to be alternately fed in or fed out multiple times for printing. The close contact between the paper feed roller and the image surface of the print medium can easily scratch the print color, resulting in poor printing effect. Summary of the invention

[0004] The invention discloses a portable printer and a printing mechanism and a printing method thereof, which have simple structure and convenient operation, and can adjust the position of a crimping roller during the printing process, so as to achieve better effect of printing multi-color images.

[0005] The present invention adopts the following scheme:

[0006] A printer mechanism, comprising a main frame, a head component and a paper feeding component arranged on the main frame, wherein the head component comprises a thermal head, a platen roller and a head support plate, wherein the thermal head and the platen roller are arranged opposite to each other, the head support plate and the platen roller are respectively connected to the main frame, and the head support plate drives the thermal head to leave or approach the platen roller in a manner of raising or lowering the head;

[0007] The head component and the paper feeding component are constructed as separate components, and the paper feeding component includes a paper feeding roller and a pressing roller arranged opposite to each other up and down;

[0008] Wherein, the paper feeding roller is rotatably arranged on the main frame;

[0009] Wherein, the pressing roller is rotatably arranged on the main frame;

[0010] When the head support plate lifts up and drives the thermal head away from the platen roller, the head component can apply force to the pressure roller to clamp the recording paper between the pressure roller and the paper feed roller.

[0011] As a further improvement, the crimping roller has two coupling ends coupling it to the main frame, and at least one of the two coupling ends is slidably coupled to the main frame.

[0012] As a further improvement, one of the two coupling ends is pivotally connected to the main frame in a rotatable manner, and the other is slidably coupled to the main frame in a manner that allows it to move along a preset path.

[0013] As a further improvement, a linkage piece is connected between the crimping roller and the head component so that it can be linked with the head component.

[0014] As a further improvement, the linkage member is configured on the main frame in a lever structure.

[0015] As a further improvement, the linkage is a torsion spring, which includes a main body and two pins. The main body is sleeved on the main body frame to form a fulcrum of the lever, and the two pins extend from the main body to both sides and are respectively connected to the crimping roller and the head component.

[0016] As a further improvement, one of the two pins is connected to the head support plate or the thermal head.

[0017] As a further improvement, the head support plate drives the thermal head to a first preset position in a lowered manner, and a released state is formed between the pressure contact roller and the paper feed roller so that the recording paper can move freely. In this released state, the recording paper between the pressure contact roller and the paper feed roller can be alternately fed in or out for multi-color printing.

[0018] As a further improvement, the head support plate drives the thermal head to a second preset position in an upward manner, and a clamping state in which the recording paper can be clamped is formed between the crimping roller and the paper feed roller. In this clamping state, the paper feed roller rotates under the drive of its power source to feed out the printed recording paper.

[0019] A portable printer comprises a printing mechanism, wherein the printing mechanism is the above-mentioned printing mechanism.

[0020] A printing method is applied to a portable printer, the portable printer comprises a printer mechanism, the printer mechanism comprises a main frame, a head component and a paper feeding component arranged on the main frame, the head component comprises a thermal head and a head support plate, the head support plate is movably combined with the main frame, and the head support plate supports the thermal head in a manner of raising or lowering the head; the paper feeding component comprises a paper feeding roller and a pressure contact roller arranged opposite to each other up and down; the printing method comprises:

[0021] The pressing roller approaches the paper feeding roller in response to the head support plate raising its head, and is located at a preset position on the head support plate, and the head support plate applies force to the pressing roller to form a clamping state between the pressing roller and the paper feeding roller so that the recording paper can be clamped;

[0022] In this clamped state, the paper feed roller is driven by a power source to rotate to feed out the printed recording paper.

[0023] As a further improvement, the printing method further includes:

[0024] When the head support plate is located at another preset position, a release state is formed between the pressing roller and the paper feeding roller so that the recording paper can move freely;

[0025] In this released state, the recording paper between the pressing roller and the paper feed roller can be alternately fed in or out to perform multi-color printing.

[0026] As a further improvement, the head component further includes a pressing roller, which drives the recording paper to move between the pressing roller and the paper feeding roller by rotating to perform multi-color printing.

[0027] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0028] 1. The present invention uses a linkage between the head component and the crimping roller. When the recording paper alternately enters and exits the paper feed roller and the crimping roller, the head support plate lifts the crimping roller through the linkage so that the paper feed roller and the crimping roller are in a released state during the printing process. The recording paper can move freely, preventing the crimping roller from contaminating the unfinished protective layer pattern on the recording paper, thereby improving the printing effect. When printing is completed, the head support plate applies pressure through the linkage so that the crimping roller and the paper feed roller are in a clamped state, thereby transmitting the printed paper.

[0029] 2. One end of the coupling end of the crimping roller of the present invention is pivotally connected to the main frame in a rotatable manner, and the other end can be slidably coupled to the main frame in a preset path. The crimping roller and the paper feed roller can rotate with the recording paper when they are clamped or released, thereby reducing the resistance to the recording paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 is a schematic diagram of a symmetrical cross-sectional structure of an embodiment of the present invention;

[0032] Figure 2 is a structural schematic diagram of a hidden upper main frame of an embodiment of the present invention;

[0033] Figure 3 is a structural schematic diagram of a paper feeding component according to an embodiment of the present invention from a first viewing angle;

[0034] Figure 4 is a schematic diagram of the exploded structure of the paper feeding component of the embodiment of the present invention from a second viewing angle;

[0035] Figure 5 is a schematic diagram of the structure of the crimping roller at different positions according to an embodiment of the present invention;

[0036] Figure 6 is a schematic structural diagram of an embodiment of the present invention;

[0037] Figure 7 is a schematic structural diagram of a head component, a paper feeding component and a linkage component according to an embodiment of the present invention;

[0038] Figure 8 yes Figure 6 Schematic diagram of the cross-sectional structure in the AA direction;

[0039] Fig. 9 is a schematic structural diagram of a support rod of a head support plate in an embodiment of the present invention being in a first preset position;

[0040] Fig.10 is a schematic structural diagram of a support rod of a support plate in an embodiment of the present invention being in a second preset position;

[0041] Icons: 1-main frame; 2-head component; 3-paper feeding component; 4-paper feeding pressure plate; 6-paper feeding partition; 7-linkage component; 8-transmission gear; 9-swing component; 11-paper bin; 12-sensing device; 14 installation part; 15-slide groove; 16-round hole; 21-thermal head; 22-pressing roller; 23-head support plate; 31-paper feeding roller; 32-crimping roller; 41-linkage mechanism; 71-main body; 72-pin; 100 first driving device; 231-support rod; 232-first rotating shaft; 321-first connecting end; 322 second connecting end. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0047] Example

[0048] Combination Figures 1 to 10 , this embodiment provides a printing mechanism, including a main frame 1, and a head component 2 and a paper feeding component 3 arranged on the main frame 1. The head component 2 and the paper feeding component 3 are constructed as separate components. The head component 2 includes a thermal head 21, a platen roller 22 and a head support plate 23, the thermal head 21 is fixedly mounted on the head support plate 23, the head support plate 23 and the platen roller 22 are respectively connected to the main frame 1, and the thermal head 21 and the platen roller 22 are arranged opposite to each other. The paper feeding component 3 includes a paper feeding roller 31 and a crimping roller 32 arranged opposite to each other up and down, wherein the paper feeding roller 31 and the crimping roller 32 are both rotatably configured on the main frame 1. In this embodiment, the head support plate 23 drives the thermal head 21 to leave or approach the platen roller 22 in a manner that it can raise or lower its head, and at the same time, the head support plate 23 drives the crimping roller 32 and the paper feeding roller 31 to be in a clamped state or a released state.

[0049] Reference Figure 1 to Figure 2 As shown, a paper bin 11 for accommodating recording paper is provided at the rear end of the main frame 1. The front end of the paper bin 11 extends forward so that the front end of the paper bin 11 exceeds the position of the paper feed roller 31. A paper feed pressure plate 4 is provided at the bottom of the paper bin 11. When the printer starts the printing function, the paper feed pressure plate 4 lifts the recording paper in the paper bin 11. The recording paper is in close contact with the lower end of the paper feed roller 31, so that there is friction between the two. The paper feed roller 31 is driven by the driving source to convey the recording paper forward. When the recording paper is conveyed to the impression roller 22, the paper feed pressure plate 4 drops to prevent the paper feed roller 31 from continuing to convey the next recording paper. When the next printing starts, the paper feed pressure plate 4 will continue to lift up, and this action will be repeated in sequence.

[0050] Reference Figures 3 to 5The crimping roller 32 has two coupling ends that couple it to the main frame 1. The first coupling end 321 is pivotally connected to the main frame 1 in a rotatable manner, and the second coupling end 322 is slidably coupled to the main frame 1 in a manner that allows it to move along a preset path at different preset positions of the head support plate 23. In this embodiment, the first coupling end 321 is matched with the circular hole 16, and the second coupling end 322 is matched with the slide groove 15, and the slide groove 15 guides the second coupling end 322 to slide up and down. In order to enable the crimping roller 32 and the paper feed roller 31 to switch between a clamped state and a released state, only one of the two coupling ends may be slidably coupled to the main frame 1, or both coupling ends may be slidably connected to the main frame 1, and the corresponding two sides of the main frame 1 are also slide grooves. Refer to Figure 6 and Figure 7 , a mounting portion 14 is provided on the main frame 1, and the linkage member 7 is configured on the main frame 1 with the mounting portion 14 as the fulcrum of the lever structure. In this embodiment, the linkage member 7 is a torsion spring, which includes a main body 71 and two pins 72. The main body 71 is sleeved on the mounting portion 14 to form the fulcrum of the lever. The two pins 72 extend from the main body 71 to both sides and are respectively connected to the crimping roller 32 and the head support plate 23. The rise of one end will drive the other end to fall. When only one of the combined ends of the crimping roller 32 slides up and down, the linkage member 7 connects the upper and lower sliding ends; if both combined ends can slide up and down, the left and right ends can be connected to the linkage member 7 respectively, or the entire crimping roller 32 can be driven to slide by one linkage member 7. In this embodiment, the pin connected to the crimping roller 32 is connected to the second combined end 322. In one embodiment, the two pins 72 can also be connected to the crimping roller 32 and the thermal head 21 respectively.

[0051] Reference Figures 8 to 10 One end of the head support plate 23 is rotatably pivoted to the main frame 1 through the first rotating shaft 232, and the other end is supported on the swing member 9 through the support rod 231. When the swing member 9 rotates, it will drive the head support plate 23 to rotate up and down along the first rotating shaft 232 as the axis, thereby driving the thermal head 21 to rise or fall. Specifically, a second driving device (not shown in the figure) is provided in the printer, and the second driving device drives the swing member 9 to rotate through the transmission gear 8, thereby driving the head support plate 23 to rotate to different positions.

[0052] Reference Fig. 9 The lowest position of the head support plate 23 is the printing position, which is set as the first predetermined position. When the head support plate 23 is lowered to the first predetermined position, the second joint end 322 is driven to move upward by the linkage member 7, and the pressure roller 32 is in the position as shown in FIG. Figure 5 At the position of the middle dotted line, a release state is formed between the pressure-contact roller 32 and the paper feed roller 31 so that the recording paper can move freely. In this release state, the recording paper will not be subject to resistance from the pressure-contact roller 32.

[0053] Reference Fig.10 The highest position of the head support plate 23 is the clamping position of the pressure roller 32 and the paper feeding roller 31, which is set as the second preset position. When the head support plate 23 is lifted to the second preset position, the second joint end 322 is driven downward by the linkage member 7, and the pressure roller 32 is lowered to the position as shown in FIG. Figure 5 At the position of the solid line in the middle, the recording paper is clamped between the pressure roller 32 and the paper feeding roller 31, and the recording paper is delivered in this state. It should be noted that when the pressure roller 32 and the paper feeding roller 31 are in the clamped state, the first joint end 321 and the second joint end 322 are at the same level, and the pressure of the pressure roller 32 on the left and right sides of the recording paper can be kept consistent, so that the recording paper will not be delivered obliquely.

[0054] In order to smoothly feed or deliver the recording paper between the paper feed roller 31 and the pressing roller 32, a paper feed partition 6 is provided between the paper feed roller 31 and the impression roller 22. The end of the paper feed partition 6 near the paper feed roller 31 has an arc extending upward to match the paper feed roller 31, so that the recording paper can be guided to be delivered between the paper feed roller 31 and the pressing roller 32 when being delivered. The paper feed partition 6 separates the paper feed passage and the paper discharge passage, and the upper side of the paper feed partition 6 is the paper discharge passage, and the lower side is the paper feed passage.

[0055] The present invention provides a portable printer, comprising the above-mentioned printer mechanism.

[0056] The present invention provides a printing method, which is applied to a portable printer, including the above-mentioned printer mechanism, and the printing method includes: the pressure roller 32 approaches or moves away from the paper feed roller 31 in response to the head support plate 23 raising or lowering the head. When the head support plate 23 is located at a preset position of lowering the head, a release state is formed between the pressure roller 32 and the paper feed roller 31, in which the recording paper can move freely. In this release state, the recording paper can be alternately fed into or out of the head component 2 for multi-color printing. When the head support plate 23 is located at another preset position of raising the head, the head support plate 23 applies force to the pressure roller 32, so that a clamping state in which the recording paper can be clamped is formed between the pressure roller 32 and the paper feed roller 31, in which the recording paper can be clamped, and in this clamping state, the paper feed roller 31 rotates under the drive of a power source to feed the printed recording paper.

[0057] The head component 2 also includes a platen roller 22. The platen roller 2 switches its rotation direction when driven by the first driving device 100, and drives the recording paper to move between the pressure roller 32 and the paper feeding roller 31 by rotating to perform multi-color printing.

[0058] Taking printing yellow, red, blue and protective layer as an example, a total of 4 prints are required. The following is the working principle of the printer: turn on the printing function, the paper feed plate 4 lifts the printing paper, and the driving source drives the paper feed roller 31 to rotate counterclockwise to transport the recording paper forward. The recording paper is conveyed forward from under the paper feed partition 6, and a sensing device 12 is provided between the paper feed roller 31 and the platen roller 22. When the sensing device 12 senses that recording paper is being conveyed in, the paper feed platen 4 descends to prevent the paper feed roller 31 from feeding in recording paper before the last recording paper is fed out; at the same time, a signal is transmitted to the first drive device 100, and the first drive device 100 starts to drive the platen roller 22 to rotate clockwise. After the recording paper is conveyed into the designated position in the head component 2, the head support plate 23 drives the thermal head 21 to enter the first predetermined position. At this time, the first drive device 100 will switch the rotation direction, driving the platen roller 22 to rotate counterclockwise, and the thermal head 21 starts printing. During printing, the recording paper moves along the upper side of the paper feed partition 6 toward the direction between the paper feed roller 31 and the platen roller 32. When the thermal head 21 enters the first predetermined position, the linkage 7 will drive the sliding end of the pressure roller 32 to move upward, so that a release state is formed between the pressure roller 32 and the paper feed roller 31 so that the recording paper can move freely. In this release state, the recording paper between the pressure roller 32 and the paper feed roller 31 can be alternately fed in or out for multi-color printing, which can prevent the pressure roller 32 from applying pressure to contaminate the image on the image surface. After printing one color and sending the recording paper out of a certain position between the paper feed roller 31 and the pressure roller 32, the first driving device 100 and the driving source will switch the rotation direction, and the paper feed roller 31 and the impression roller 22 will rotate clockwise to feed the recording paper into the specified position in the head component 2 again. During the process of feeding into the head component 2, the second driving device will drive the head support plate 23 to drive the thermal head 21 to lift upward to prevent the thermal head 21 from being in close contact with the image surface of the recording paper. Although the head support plate 23 will be lifted upward at this time, the height of the lift will not cause the recording paper to be clamped between the pressure roller 32 and the paper feed roller 31 so that the pressure roller 32 will not damage the image surface of the recording paper. The pressure roller 32 and the paper feed roller 31 are still in a released state where the recording paper can move freely. After the recording paper is conveyed to the designated position in the head component 2, the second drive device will drive the head support plate 23 to drive the thermal head 21 to enter the first predetermined position. At this time, the first drive device 100 will switch the rotation direction, and the thermal head 21 starts to print the second color. After the above actions are performed, when the printing of the protective layer is completed, the second drive device will drive the transmission gear 8 to lift the head support plate 23 to the second preset position. The head support plate 23 applies pressure to the pressure roller 32 through the linkage 7, so that the pressure roller 32 and the paper feed roller 31 form a clamped state where the recording paper is clamped. In this state, the paper feed roller 31 rotates counterclockwise under the drive of the drive source to deliver the recording paper.It should be noted that when the sensing device 12 senses that recording paper has entered, it can calculate when the rotation direction of the paper feed roller 31 and the pressure roller 22 should be automatically switched based on the designated position of the recording paper in the head component 2 and the step distance at which the paper is transmitted to a certain position between the paper feed roller 31 and the pressure roller 32 after printing one color, so as to alternately feed the recording paper in or out for multi-color printing.

[0059] The above are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention.

Claims

1. A printer mechanism, comprising a main frame (1), a head component (2) and a paper feeding component (3) arranged on the main frame (1), wherein the head component (2) comprises a thermal head (21), a platen roller (22) and a head support plate (23), wherein the thermal head (21) and the platen roller (22) are arranged opposite to each other, the head support plate (23) and the platen roller (22) are respectively connected to the main frame (1), and the head support plate (23) drives the thermal head (21) to leave or approach the platen roller (22) in a manner of raising or lowering the head; characterized in that: The head component (2) and the paper feeding component (3) are constructed as separate components, and the paper feeding component (3) comprises a paper feeding roller (31) and a pressure contact roller (32) which are arranged opposite to each other up and down; Wherein, the paper feeding roller (31) is rotatably arranged on the main frame (1); Wherein, the pressing roller (32) is rotatably arranged on the main frame (1); When the head support plate (23) drives the thermal head (21) away from the impression roller in a raised manner, the head component (2) can apply force to the pressure roller (32) to clamp the recording paper between the pressure roller (32) and the paper feeding roller (31).

2. The printing mechanism according to claim 1, characterized in that: The pressing roller (32) has two connecting ends for connecting it to the main frame (1), and at least one of the two connecting ends is slidably connected to the main frame (1).

3. The printing mechanism according to claim 2, characterized in that: One of the two joint ends is pivotally connected to the main frame (1) in a rotatable manner, and the other is slidably connected to the main frame (1) in a movable manner along a preset path.

4. The printing mechanism according to any one of claims 1 to 3, characterized in that: A linkage member (7) is connected between the crimping roller (32) and the head component (2) so that it can be linked with the head component (2).

5. The printing mechanism according to claim 4, characterized in that: The linkage member (7) is arranged on the main frame (1) in a lever structure.

6. The printer mechanism according to claim 5, characterized in that: The linkage member (7) is a torsion spring, which comprises a main body (71) and two pins (72). The main body (71) is sleeved on the main frame (1) to form a fulcrum of the lever, and the two pins (72) extend from the main body (71) to both sides and are respectively connected to the crimping roller (32) and the head component (2).

7. The printer mechanism according to claim 6, characterized in that: One of the two pins (72) is connected to the head support plate (23) or the thermal head (21).

8. The printer mechanism according to claim 7, characterized in that: The head support plate (23) drives the thermal head (21) to a first preset position in a lowered manner, and a release state is formed between the pressure-contact roller (32) and the paper feed roller (31) so that the recording paper can move freely. In this release state, the recording paper between the pressure-contact roller (32) and the paper feed roller (31) can be alternately fed in or out to perform multi-color printing.

9. The printing mechanism according to claim 1 or 8, characterized in that: The head support plate (23) drives the thermal head (21) to a second preset position in a lifting manner, and a clamping state in which the recording paper can be clamped is formed between the pressure-contact roller (32) and the paper feed roller (31). In this clamping state, the paper feed roller (31) rotates under the drive of its power source to feed out the printed recording paper.

10. A portable printer, comprising a printer mechanism, characterized in that: The printing mechanism is the printing mechanism according to any one of claims 1 to 9.

11. A printing method, applied to a portable printer, the portable printer comprising a printer mechanism, the printer mechanism comprising a main frame (1) and a head component (2) and a paper feeding component (3) arranged on the main frame (1), the head component (2) comprising a thermal head (21) and a head support plate (23), the head support plate (23) being movably combined with the main frame (1), and the head support plate (23) supporting the thermal head (21) in a manner that the head can be raised or lowered; the paper feeding component (3) comprising a paper feeding roller (31) and a pressure contact roller (32) arranged opposite to each other up and down; the printing method comprises: The pressing roller (32) approaches the paper feeding roller (31) in response to the head support plate (23) raising its head, and is located at a preset position on the head support plate (23). The head support plate (23) applies force to the pressing roller (32) to form a clamping state between the pressing roller (32) and the paper feeding roller (31) in which the recording paper can be clamped. In this clamped state, the paper feed roller (31) is driven by a power source to rotate to feed out the printed recording paper; When the head support plate (23) is located at another preset position, a release state is formed between the pressure contact roller (32) and the paper feeding roller (31) so that the recording paper can move freely; In this released state, the recording paper between the pressing roller (32) and the paper feeding roller (31) can be alternately fed in or out to perform multi-color printing.

12. The printing method according to claim 11, characterized in that: The head component also includes a pressing roller (22), and the pressing roller (22) drives the recording paper to move between the pressing roller (32) and the paper feeding roller (31) by rotating to perform multi-color printing.

Images