Printer core and printer

Abstract

The utility model discloses a printer core, comprising a thermal head assembly; printing paper can be clamped between the impression roller and the thermal head assembly; the paper guide part is located in front of the lower side of the thermal head assembly, and a gap is formed between the paper guide part and the thermal head assembly; a paper clamping prevention piece for preventing the printing paper from entering the gap is arranged between the thermosensitive head assembly and the paper guide part; the paper jamming prevention piece comprises a fixing part and a clamping part, wherein the fixing part is arranged on the front side of the paper guide surface of the paper guide part or the front side of the thermal head assembly; the covering part covers at least part of the gap; and the abutting part abuts against the front side of the thermal head assembly or the front side of the paper guide part and is driven by the swing of the thermal head assembly to elastically deform so as to be tightly attached to the thermal head assembly or the paper guide part. According to the printer core, the problem of paper jamming can be solved. The utility model further provides a printer.

Description

TECHNICAL FIELD

[0001] The utility model relates to printing equipment technology, specifically, a kind of printer core and printer. BACKGROUND

[0002] Patent application CN221457119U discloses a structure for improving the smoothness of paper feeding and withdrawing and a printer, which forms a paper withdrawing guide part on the upper end of the paper feeding guide block. When the paper is withdrawn, the label on the paper does not come into contact with the upper edge of the paper feeding guide block. In this way, the label is prevented from being peeled off, and the label is smoothly withdrawn, preventing paper jamming. The technical solution of the aforementioned patent application can prevent paper jamming to a certain extent, but still has some shortcomings. Specifically, the technical solution of patent application CN221457119U has a predetermined gap between the paper feeding guide block and the thermal sensitive sheet. The main function of this predetermined gap is to provide a clearance space for the thermal sensitive sheet and the thermal sensitive sheet substrate to swing back and forth. When the temperature is relatively low (e.g., as low as 3 degrees Celsius), the adhesive property of the commonly available peelable printing paper on the market will decrease. At this time, when the printing paper is withdrawn, the label of the peelable printing paper will easily peel off and get stuck in the aforementioned gap, causing paper jamming and resulting in problems with the withdrawal of the printing paper. Therefore, the present application is proposed. SUMMARY

[0003] The technical problem to be solved by the present utility model is to provide a printer core that can prevent paper jamming and is different from the prior art.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a printer core, comprising: a thermal head assembly; a platen roller, which can clamp a printing paper between the thermal head assembly and the platen roller. The platen roller is controlled to rotate to drive the printing paper to move along a first path. The thermal head assembly always has a tendency to swing to tightly contact the platen roller under the action of an elastic force applying member. A paper guide part is located in front of the lower side of the thermal head assembly and has a gap between the thermal head assembly. The paper guide part is configured to appropriately guide the printing paper to move along a second path. The first path and the second path have a predetermined included angle. A paper jamming prevention member is arranged between the thermal head assembly and the paper guide part to prevent the printing paper from entering the gap. The paper jamming prevention member comprises: a fixed part, which is arranged on the front side of the paper guide surface of the paper guide part or the front side of the thermal head assembly; a covering part, which covers at least part of the gap; and an abutting part, which abuts against the front side of the thermal head assembly or the front side of the paper guide part and elastically deforms under the swing of the thermal head assembly to keep tightly contacting the thermal head assembly or the paper guide part.

[0005] Preferably, the printing paper is a peelable printing paper, and the impression roller is arranged to drive the printing paper to exit along the first path in forward rotation and to drive the printing paper to retreat along the first path in reverse rotation.

[0006] Preferably, the fixing portion is fixed to the paper guide portion or the thermal head assembly by an adhesive.

[0007] Preferably, the abutting portion has a plurality of abutting units arranged at intervals in the left-right direction.

[0008] Preferably, the covering portion is elastically deformed by swinging of the thermal head assembly; the covering portion has a plurality of covering units arranged at intervals in the left-right direction.

[0009] Preferably, the anti-jamming piece is an integrally formed sheet.

[0010] Preferably, the sheet is a PET sheet; the thickness of the sheet is between 0.1 mm and 0.3 mm.

[0011] Preferably, the paper guide surface of the paper guide portion has a groove near the side close to the thermal head assembly; the fixing portion is arranged in the groove and is substantially flush with the paper guide surface of the paper guide portion.

[0012] Preferably, the fixing portion covers the paper guide surface of the paper guide portion in the direction of the second path; and at least one extension is arranged at the end of the fixing portion away from the thermal head assembly.

[0013] Preferably, the printer core comprises a frame, the thermal head assembly is mounted on the frame, the frame comprises the paper guide portion and a back plate portion arranged at the back side of the thermal head assembly; the elastic force applying piece is arranged between the back side of the thermal head assembly and the back plate portion; the frame is provided with a mounting groove for engaging the impression roller; and the included angle between the first path and the second path is between 100 degrees and 150 degrees.

[0014] The application further provides a printer comprising the printer core as described in any one of the preceding aspects.

[0015] Preferably, the printer is a handheld printer.

[0016] Thanks to the above technical solutions, the present application has the following advantages:

[0017] 1. The printer core of the present application, by setting the anti-jamming part, the abutting part of the anti-jamming part always keeps close to the front side of the thermal head assembly or the front side of the paper guide part, the back-off printing paper will be guided by the anti-jamming part to back off along the first path and the second path, which can avoid the printing paper entering the gap between the thermal head assembly and the paper guide part; especially for the printing of peelable printing paper, it can more reliably solve the paper jam problem caused by the reduction of adhesive viscosity of peelable printing paper. Specifically, the printer core of the present application, the abutting part of the anti-jamming part always keeps close to the front side of the thermal head assembly or the front side of the paper guide part, the peelable printing paper will be guided by the anti-jamming part to back off along the first path and the second path, the peelable part of the printing paper will not be separated from the substrate and jammed in the gap to cause paper jam;

[0018] 2. The abutting part has a plurality of abutting units arranged in the left and right directions, which can reduce the contact area of the abutting part with the thermal head assembly or the paper guide part, and further reduce the reaction force of the paper guide surface of the thermal head assembly or the paper guide part to the abutting part, and reduce the possibility of the fixing part being peeled off from the paper guide part or the thermal head assembly due to the reaction force;

[0019] 3. The paper guide surface of the paper guide part has a groove on the side close to the thermal head assembly, and the fixing part is arranged in the groove and is basically flush with the paper guide surface of the paper guide part, which can avoid the anti-jamming part protruding from the paper guide surface of the paper guide part and affecting the forward or backward movement of the printing paper. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present application, but not limit the present application.

[0021] Figure 1 A schematic diagram of peelable printing paper is shown;

[0022] Figures 2 to 4 Schematic diagrams of the printer core of an embodiment are shown from different angles respectively;

[0023] Figure 5 A first exploded view of the printer core of an embodiment is shown;

[0024] Figure 6 A second exploded view of the printer core of an embodiment is shown;

[0025] Figure 7 A third exploded view of the printer core of an embodiment is shown;

[0026] Figure 8 A fourth exploded view of the printer core of an embodiment is shown;

[0027] Figure 9 Fig. 1 shows a cross-sectional view of a printer core in a first perspective view according to an embodiment;

[0028] Figure 10 Fig. 2 shows a cross-sectional view of a printer core in a second perspective view according to an embodiment;

[0029] Figure 11 Fig. 3 shows a schematic view of a frame of a printer core according to an embodiment;

[0030] Figure 12 Fig. 4 shows a schematic view of a paper guide and a fixing part separated according to an embodiment;

[0031] Figure 13 Fig. 5 shows a schematic view of a printer core according to another embodiment.

[0032] Reference signs:

[0033] Frame 1, thermal head assembly 2, impression roller 3, driving device 4, side cover 5, flexible substrate 6, detector support 7, detector 8, anti-jamming piece G, substrate M1, peelable part M2, paper guide T1, rear side plate part T2, right side plate part T3, left mounting part T4, elastic force applying piece P1, elastic pressure applying piece P2. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the present application will be further described in detail below with reference to the drawings. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] Some embodiments of the present application will be described in detail below with reference to the drawings. The features in the following embodiments can be combined with each other without conflict.

[0036] In combination with Figures 1 to 11 In an embodiment, the printer core of the present application comprises a frame 1, a thermal head assembly 2, an impression roller 3, a driving device 4, a side cover 5, a flexible substrate 6, a detector support 7, a detector 8, and an anti-jamming piece G. The printer core of the present embodiment can be used for printing peelable printing paper, such as common peelable label printing paper used in supermarkets and logistics, in combination with Figure 1The peelable printing paper comprises a substrate M1 and a peelable portion M2 which are bonded by adhesive. For the purpose of illustration, the X direction in the drawing is taken as the direction from right to left, the Y direction is taken as the direction from back to front, and the Z direction is taken as the direction from bottom to top. It should be understood that the definition of the directions in the present application is not intended to limit the actual installation position of the printer core on the product.

[0037] The frame 1 can be a one-piece structure which can be integrally formed by, for example, an injection molding process. In combination with the above description, Figure 11 The frame 1 has a paper guide portion T1 located at the front side, a rear plate portion T2 located at the rear side, a right plate portion T3 located at the right side, and a left mounting portion T4 located at the left side.

[0038] The front side of the paper guide portion T1 has a paper guide surface which is generally in the shape of an inclined slope for guiding the movement of the printing paper along the second path L2 (in combination with the above description Figure 10 and Figure 11 The paper guide portion T1 has a plurality of through holes which are used for detecting the position of the printing paper by the detection portion of the detector 8. The paper guide portion T1 is located in front of the lower side of the thermal head assembly 2 and has a gap S with the thermal head assembly 2.

[0039] The rear plate portion T2 is located at the rear side of the thermal head assembly 2. The front surface of the rear plate portion T2 has a plurality of groove portions 1C which are arranged at intervals in the left-right direction and are used for abutting against the rear side of the elastic biasing member P1. The right plate portion T3 and the left mounting portion T4 each have a sliding groove 1A which is used for slidingly engaging the sliding portion 2A of the thermal head assembly 2 (in combination with the above description Figures 5 to 7 ). The paper guide portion T1 and the rear plate portion T2 are arranged at intervals in the front-rear direction and form an accommodation space therebetween. The accommodation space is used for arranging the lower side of the thermal head assembly 2 and provides the space required for the front-rear swinging of the thermal head assembly 2. The thermal head assembly 2 arranged in the accommodation space has the aforementioned gap S with the paper guide portion T1.

[0040] The right plate portion T3 and the left mounting portion T4 also have a mounting groove 1B which is generally in the shape of a U-shaped groove in the present embodiment. The mounting groove 1B is used for engaging the platen roller 3 and will be described in detail hereinafter. The left mounting portion T4 has an arrangement portion 1D which is used for arranging the gear transmission assembly of the driving device 4. The frame 1 has a rear fulcrum portion 1E and a front fulcrum portion 1F. Specifically, the rear fulcrum portion 1E is located at the middle of the front side of the rear plate portion T2, and the front fulcrum portion 1F is located at the middle of the rear side of the paper guide portion T1. The positions of the rear fulcrum portion 1E and the front fulcrum portion 1F in the front-rear direction correspond to each other, and they are arranged at intervals therebetween so as to be capable of clamping the fulcrum engaging portion 2B of the thermal head assembly 2 (in combination with the above description Figure 5 , Figure 11 ). The front surface of the rear fulcrum portion 1E is generally in the shape of a circular arc, and the rear surface of the front fulcrum portion 1F is generally in the shape of a plane.

[0041] The thermal head assembly 2 is mounted on the frame 1, which includes a head support plate and a thermal head mounted on the head support plate and used in cooperation with the impression roller 3. The left and right sides of the head support plate have sliding portions 2A, and the lower side has a fulcrum cooperation portion 2B. The left and right sides of the head support plate are slidably connected to the frame 1 through the sliding portions 2A and the sliding grooves 1A in the front-rear direction, and the lower side is connected to the frame 1 through the fulcrum cooperation portion 2B and the rear fulcrum portion 1E and the front fulcrum portion 1F. The rear side and the rear side plate portion T2 are provided with an elastic force applying member P1. Through the above-mentioned cooperation, the thermal head assembly 2 can swing forward and backward and also swing left and right with the rear fulcrum portion 1E as the fulcrum. After the impression roller 3 is mounted in the frame 1, the impression roller 3 exerts pressure on the thermal head assembly 2, and the thermal head assembly 2 swings backward and presses the elastic force applying member P1 to cause elastic deformation. Due to the action of the elastic force applying member P1, the thermal head assembly 2 always has a tendency to swing to tightly contact the impression roller 3. The thermal head assembly 2 swings left and right with the rear fulcrum portion 1E as the fulcrum, so that when the thermal head of the thermal head assembly 2 and the impression roller 3 contact each other, the contact positions in the left-right direction (the extension direction of the impression roller 3) are balanced, which helps to improve the printing quality. In this embodiment, the elastic force applying member P1 is a conical spring, but it can also be a cylindrical spring.

[0042]

Impression roller

[0043]

Drive device

[0044] The side cover 5 is detachably mounted on the frame 1, and is used to cover the aforementioned gear transmission assembly. The side cover 5 and the frame 1 can be engaged by using a snap structure, and thus will not be described herein. The flexible substrate 6 is electrically connected with the detector 8 and the motor 5, and is electrically connected with a control unit (not shown) of the printer core. The detector 8 is mounted on the detector support 7, and is used to detect the position of the printing paper. The detector 8 is, for example, a reflective photoelectric sensor, which can emit light and can generate a sensing signal when receiving reflected light reflected by the printing paper, so that the control mechanism of the printer core can determine whether the printing paper is in the detection range.

[0045]

Anti-jamming piece

[0046] The fixing portion G1 is arranged on the front side of the paper guide portion T1, and the fixing portion G1 can be fixed on the paper guide surface of the paper guide portion T1 by using adhesive, which is simple and convenient. In other embodiments, a structure for fixing the fixing portion G1 can be arranged on the paper guide portion T1, such as a rivet or a bolt, which fixes the fixing portion G1 on the paper guide portion T1, and the rivet or the bolt does not protrude from the paper guide surface of the paper guide portion T1.

[0047] The covering portion G2 covers at least part of the gap S. In combination Figure 7 In this embodiment, the covering portion G2 is also elastically deformed by the swing of the thermal head assembly 2, so that the abutting portion G3 can better adhere to the thermal head assembly 2; and the covering portion G2 has a plurality of covering units G21 arranged at intervals in the left-right direction. The covering portion G2 is simultaneously elastically deformed by the swing of the thermal head assembly 2, so that the abutting portion G3 can better adhere to the thermal head assembly 2 and better adapt to the left-right swing of the thermal head assembly 2.

[0048] The abutting portion G3 abuts against the front side of the thermal head assembly 2, and the abutting portion G3 is elastically deformed by the swing of the thermal head assembly 2 to maintain adhesion to the thermal head assembly 2. In combination Figure 7 In this embodiment, the abutting portion G3 has a plurality of abutting units G31 arranged at intervals in the left-right direction. The abutting units G31 are arranged at intervals, which can reduce the contact area between the abutting portion G3 and the thermal head assembly 2, thereby reducing the reaction force of the thermal head assembly 2 on the abutting portion G3 and reducing the possibility that the fixing portion G1 is peeled off from the paper guide portion T1 due to the reaction force. At the same time, when the thermal head assembly 2 swings left and right with the rear fulcrum portion IE as the fulcrum to adapt to the rubber roller, the abutting portion G3 can also better adapt to the left-right swing of the thermal head assembly 2 and better adhere to the thermal head assembly 2 in the left-right direction.

[0049] The specific principle of the paper jam prevention member G playing a role in preventing paper jam will be further described below. Please refer to Figure 10 When the impression roller 3 drives the peelable printing paper (refer to Figure 1 ) to retreat, even if the adhesive property of the peelable printing paper is reduced (the main reason for the reduction of the adhesive property is the low temperature, which has been tested that when the temperature is as low as 3 degrees Celsius or lower, the adhesive property of the common peelable printing paper will be greatly reduced, and the substrate M1 and the peelable portion M2 are easily separated), because the abutting portion G3 always adheres to the front side of the thermal head assembly 2, the printing paper that retreats will be guided by the paper jam prevention member G to retreat along the first path L1 and the second path L2. Even if the peelable portion M2 is partially peeled off from the substrate M1, the peeled part will retreat along the paper jam prevention member G, and the peelable portion M2 will not be separated from the substrate M1 to cause paper jam.

[0050]

Variation Embodiment

[0051] In another embodiment, the fixed portion G1 can be arranged on the front side of the thermal head assembly 2, the abutting portion G3 abuts against the front side of the paper guide portion T1, and is elastically deformed by the swinging of the thermal head assembly 2 to keep close to the paper guide portion T1. Preferably, the abutting portion G3 is substantially flush with the paper guide surface of the paper guide portion T1 to avoid affecting the feeding or discharging of the paper. The fixed portion G1 can be fixed to the thermal head assembly 2 by adhesive, or a structure for fixing the fixed portion G1 can be arranged on the thermal head assembly 2, such as a rivet or bolt for fixing the fixed portion G1 to the thermal head assembly 2. In this variant embodiment, the cover portion G2 can still be arranged to be elastically deformed by the swinging of the thermal head assembly 2; and the cover portion G2 can still include a plurality of cover units G21 arranged at intervals in the left-right direction, which can make the abutting portion G3 better close to the paper guide surface of the paper guide portion T1 and better adapt to the left-right swinging of the thermal head assembly 2. In this variant embodiment, the abutting portion G3 can still include a plurality of abutting units G31 arranged at intervals in the left-right direction, which can reduce the contact area between the abutting portion G3 and the paper guide portion T1, thereby reducing the reaction force of the paper guide surface of the paper guide portion T1 against the abutting portion G3 and reducing the possibility of the fixed portion G1 being peeled off from the thermal head assembly 2 due to the reaction force; at the same time, when the thermal head assembly 2 swings left and right with the rear fulcrum portion IE as the fulcrum to adapt to the rubber roller, the abutting portion G3 can also better adapt to the left-right swinging of the thermal head assembly 2 and keep better close to the paper guide surface of the paper guide portion T1 in the left-right direction.

[0052] In combination Figure 12 In another embodiment, the paper guide surface of the paper guide portion T1 has a groove T11 near the side close to the thermal head assembly 2, and the fixed portion G1 is arranged in the groove T11 and substantially flush with the paper guide surface of the paper guide portion T1. This design can avoid the anti-jamming member G protruding from the paper guide surface of the paper guide portion T1 to affect the feeding or discharging of the paper.

[0053] In combination Figure 13 In another embodiment, the fixed portion G1 covers the paper guide surface of the paper guide portion T1 in the direction of the second path L2 (may cover part or all of the paper guide surface), and the end of the fixed portion G1 away from the thermal head assembly 2 is provided with at least one extension portion G4 (two extension portions G4 in this embodiment). Figure 13 The extension portion G4 extends into the paper tray of the printer (not shown in the figure, which can be a common paper tray capable of accommodating a roll of printing paper) and is attached to the inner wall of the paper tray. The extension portion G4 guides the printing paper onto the fixed portion G1 on the paper guide surface to avoid the lower end of the fixed portion G1 hindering the feeding of the printing paper or peeling the peelable portion M2 from the substrate M1.

[0054] In another embodiment, the printer core can also be used to print single sheet of printing paper (non-peeling type), because the abutting part G3 always keeps close to the front side of the thermal head assembly 2 or the front side of the paper guide, when the printing paper is backfed, the end of the backfed printing paper will be guided by the anti-jamming part G to backfeed along the first path L1 and the second path L2, and will not be jammed into the gap S to cause paper jam.

[0055] In another embodiment, the anti-jamming part G can only have a certain elastic deformation force at the abutting part G3, and the other parts do not have elastic deformation force.

[0056] In another embodiment, the thermal head assembly 2 can be arranged to rotate and slide with the middle part of the left and right sides of the frame 1, and the elastic force applying part P1 is arranged in the above-mentioned gap, and the two sides of the elastic force applying part P1 abut between the thermal head assembly 2 and the paper guide T1, that is, the elastic force applying part P1 exerts force on the thermal head assembly 2 to make it swing, and is not limited to exerting force from the back side of the thermal head assembly 2, but also can adjust the swing axis position of the thermal head assembly 2, so that the elastic force applying part P1 exerts force on the front side of the thermal head assembly 2, so that it has the movement tendency of close to the platen roller 3.

[0057] It should be understood that, as described above, the printer core of the present application can better cope with the paper jam problem caused by the decrease of the adhesive viscosity of the existing peeling type printing paper, but the technical solution of the present application is not limited to be used only on printing peeling type printing paper, the main function of the anti-jamming part G is to prevent the printing paper from entering the gap S, and the printer core for printing non-peeling type printing paper can also use the technical solution of the present application to prevent the printing paper from entering the gap S.

[0058] The present application further provides a printer, which comprises a body (not shown in the figure), a cover (not shown in the figure) rotatably arranged on the body, and the above-mentioned printer core, the frame 1 is arranged on the body, and the platen roller 3 is arranged inside the cover, when the cover is closed, the platen roller 3 is engaged with the mounting groove 1B, and the printer is, for example, a handheld printer.

[0059] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A printer core comprising: a thermal head assembly (2); a platen roller (3) capable of sandwiching a print paper with the thermal head assembly (2), the platen roller (3) being controlled to rotate to drive the print paper to move along a first path (L1), the thermal head assembly (2) always having a tendency to swing to abut the platen roller (3) under the action of an elastic force member (P1); a paper guide (T1) located in front of the lower side of the thermal head assembly (2) and having a gap (S) with the thermal head assembly (2), the paper guide (T1) being configured to guide the print paper to move along a second path (L2), the first path (L1) and the second path (L2) having a preset included angle; characterized in that a paper jam prevention member (G) is provided between the thermal head assembly (2) and the paper guide (T1) to prevent the print paper from entering the gap (S); the paper jam prevention member (G) comprises: a fixed portion (G1) provided on the front side of the paper guide (T1) or the front side of the thermal head assembly (2); a covering portion (G2) covering at least part of the gap (S); an abutting portion (G3) abutting on the front side of the thermal head assembly (2) or the front side of the paper guide (T1) and elastically deformed by the swing of the thermal head assembly (2) to maintain abutment with the thermal head assembly (2) or the paper guide (T1).

2. The printer core of claim 1, wherein, The print paper is a peelable print paper, and the platen roller (3) is arranged to drive the print paper to exit along the first path (L1) when rotating forward and to drive the print paper to retreat along the first path (L1) when rotating reversely.

3. The printer core of claim 1, wherein, The fixed portion (G1) is fixed on the paper guide of the paper guide (T1) or the thermal head assembly (2) by adhesive.

4. The printer core of claim 3, wherein, The abutting portion (G3) has a plurality of abutting units (G31) arranged at intervals in the left-right direction.

5. The printer core of claim 4, wherein, The covering portion (G2) is elastically deformed by the swing of the thermal head assembly (2); the covering portion (G2) has a plurality of covering units (G21) arranged at intervals in the left-right direction.

6. The printer core of any one of claims 1 to 5, wherein, The paper jam prevention member (G) is a one-piece sheet.

7. The printer core of claim 6, wherein, The sheet is a PET sheet; the thickness of the sheet is between 0.1 mm and 0.3 mm.

8. The printer core of any one of claims 1 to 5, wherein, The paper guide surface of the paper guide (T1) has a groove on the side close to the thermal head assembly (2), and the fixed portion (G1) is arranged in the groove and substantially flush with the paper guide surface of the paper guide (T1).

9. The printer core of any one of claims 1 to 5, wherein, The fixed portion (G1) covers the paper guide surface of the paper guide (T1) in the direction of the second path (L2), and at least one extension portion (G4) is provided at the end of the fixed portion (G1) away from the thermal head assembly (2).

10. The printer core of claim 1, wherein, The printer core comprises a frame (1), the thermal head assembly (2) is mounted on the frame (1), the frame (1) comprises the paper guide part (T1), the back side plate part (T2) located at the back side of the thermal head assembly (2), the elastic force applying member (P1) is arranged between the back side of the thermal head assembly (2) and the back side plate part (T2), the frame (1) is provided with the mounting groove (1B) for engaging the impression roller (3); the included angle between the first path (L1) and the second path (L2) is between 100 degrees and 150 degrees.

11. A printer characterized by comprising: The printer core comprises the printer core according to any one of claims 1 to 10.

Images