High-stability label printer

Abstract

The utility model provides a high-stability label printer, which comprises a casing and a top cover, wherein a paper groove is formed in the rear side in the casing; the supporting frame is detachably arranged on the front side in the machine shell, the middle of the supporting frame is sunken to form a guide area extending front and back, the rear portion of the guide area inclines backwards and extends downwards to form a guide part with the rear end corresponding to the front end of the bottom of the paper groove, and the front portion of the guide area deviates downwards forwards step by step to form a mounting part and an abutting part in sequence; the printer core comprises a flexible piece which is arranged on the mounting part, a paper guide roller and an elastic piece, the front part of the flexible piece is located above the abutting part at an interval, and a printing head is arranged at the front part of the flexible piece; limiting ridges are arranged on the top of the guiding part in a protruding mode, and a paper pressing part which extends downwards to the gap, is arranged above the guiding part and is located between the two limiting ridges is arranged on the inner side of the top cover. Through the cooperation of the guide part and the limiting ridge of the support frame and the paper pressing part, the paper outlet end part is ensured not to deviate when moving forwards and passing through the printing head, and the printing quality and the printing stability of the label printer are improved.

Description

Technical Field

[0001] The utility model relates to the field of label printers, in particular to a highly stable label printer. Background Art

[0002] The printing mechanism of the label printer adopts the thermal printing principle. The label paper is pressed onto the heated print head through the paper guide roller. As the paper guide roller drives the label paper to move outward, the heated print head performs thermal printing on the label paper. It has the advantages of being fast and portable, and is widely used in many trading occasions.

[0003] Existing label printers use an internal shell structure to design a guide channel with upper and lower gaps to guide the label paper to between the paper guide roller and the heated print head. However, during this process, due to the lack of an offset limiting structure, the label paper is prone to offset and misalignment with the paper guide roller after the label printer is moved. If the paper guide roller continues to rotate to drive the label paper outward for printing, it is easy to cause the printed content to be skewed and the label paper to jam, resulting in great instability.

[0004] The purpose of this utility model is to design a highly stable label printer in view of the problems existing in the above-mentioned prior art. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides a high-stability label printer, which can effectively solve the problems existing in the above-mentioned prior art.

[0006] The technical solution of the utility model is:

[0007] A highly stable label printer, comprising:

[0008] The housing is provided with a top opening and a movable cover, a paper slot for accommodating corresponding label rolls is provided at the rear side of the housing, and a paper outlet is provided between the top cover and the front side of the housing;

[0009] The support frame is detachably arranged on the front side of the inner part of the housing, the middle part of the support frame is recessed to form a guide area extending forward and backward, the rear part of the guide area is tilted backward and extends downward to form a guide part whose rear end corresponds to the front end of the bottom of the paper slot, and the front part is gradually offset downward to form a mounting part and abutment part in sequence, and a mounting opening communicating with the bottom side of the guide part is penetrated on one side of the mounting part close to the guide part;

[0010] The printing mechanism comprises a flexible member placed on the mounting portion and having a front interval located above the abutting portion, a paper guide roller driven by a driving device to rotate forward and backward, and an elastic member arranged between the abutting portion and the front portion of the flexible member, wherein the top surface of the flexible member is adapted to the slope of the top surface of the guide portion and the front end corresponds to the paper outlet, the rear end of the flexible member is inserted into the mounting outlet through a mounting rib limiter, and the front portion is provided with a print head arranged on the outer wall of the paper guide roller under the elastic force of the elastic member; the top protrusion of the guide portion is provided with a limiting rib corresponding to the left and right ends of the paper guide roller, and the inner side of the top cover is provided with a paper pressing portion extending downward to a gap arranged above the guide portion and located between the two limiting ribs; the paper outlet end of the label roll is guided front and back to between the paper guide roller and the print head through the guide portion and the flexible member, and is limited left and right by the two limiting ribs, and limited up and down by the paper pressing portion and the guide portion.

[0011] Furthermore, movable holes are provided on the left and right side walls of the support frame, and the left and right side protrusions on the front of the flexible member are provided with side ridges that are movably located in the movable holes. A guide groove is provided inside the front side of the casing, the bottom of which is inclined backward and extends downward, and the rear end corresponds to the front end of the flexible member. The width of the guide groove corresponds to the spacing between the two limiting ridges, and the paper outlet is formed between the front side of the guide groove and the front side of the top cover.

[0012] Furthermore, the tops of the left and right side walls of the support frame are recessed to form limiting grooves, the inner side of the top cover is provided with a pressing portion extending downward and with the lower end folded backward to form the paper pressing portion, the left and right sides of the pressing portion are folded forward to form a mounting portion on which the paper guide roller is rotatably installed, and the two ends of the paper guide roller are limited in the limiting grooves, and the driving device includes a linkage gear provided at one end of the paper guide roller and located outside the mounting portion, a transmission gear rotatably provided on one side of the support frame and meshing with the linkage gear, and a motor whose driving end meshes with the transmission gear through the driving gear; after the top cover is opened, the mounting portion drives the paper guide roller to disengage from the print head and the limiting groove, and the linkage gear disengages from the transmission gear.

[0013] Furthermore, the paper slot is used to vertically accommodate the label paper roll, and the left and right inner wall protrusions of the paper slot are provided with limit frames corresponding to the two limit ridges respectively, and the limit frames are used to limit the label paper roll to the left and right.

[0014] Furthermore, the upper ends of the two limit ridges are respectively rotatably provided with limit rods extending toward the rear side and mounted on the limit frame, and the rear ends of the two limit rods are folded toward each other to form a support part in the reel in the middle of the label roll paper, and a support wheel is rotatably sleeved between the two support parts and is supported front and rear by a support wheel on the top of the reel.

[0015] Furthermore, the two support parts are limited by the inner wall of the paper trough and are coaxially arranged with the corresponding limiting ridges. The outer walls of the two support parts at the far ends are provided with adjustment threads. The two support parts are respectively rotatably sleeved with cams located on the left and right sides of the support wheel and with threaded holes on the inner walls; the two cams are used to rotate toward the far sides and be screwed through the threaded holes to connect the corresponding adjusting threads, and then are radially limited on the left and right outer sides of the reel.

[0016] Furthermore, it also includes an adjusting member with one end rotatably arranged up and down with the rear side of the pressing part, the other end of the adjusting member extends upward and is magnetically arranged with the opposite side of the pressing part through a magnetic attraction part, and the left and right sides of the adjusting member are folded backward to form an adjusting groove with a groove bottom adapted to the paper pressing part; after the other end of the adjusting member is separated from the pressing part and swung down to the adjusting groove and snapped onto the paper pressing part, the notch of the adjusting groove is inserted between the limiting ridge and the paper pressing part and abuts against the guide part to form a limiting channel.

[0017] Therefore, the utility model provides the following effects and / or advantages:

[0018] 1. The paper output end of the label roll is guided to the space between the paper guide roller and the print head by the guide part and the flexible part, and is limited by the left and right limits of the two limit ribs, and the upper and lower limits of the paper pressure part and the guide part. Therefore, through the setting of the support frame, during the printing process, the paper output end of the label roll is limited in the left and right directions and the upper and lower directions, and is stably guided in the front and back directions through the cooperation of the guide part and the limit ribs of the support frame and the paper pressing part, ensuring that the paper output end is always facing the paper guide roller, and the paper guide roller drives the paper output end to move forward through the print head without deviation, thereby avoiding the occurrence of skewed printed content or paper jam of the label roll, and improving the printing quality and printing stability of the label printer; at the same time, through the setting of the paper pressing part, when the label roll is over-rolled in the mobile label printer, the paper output end can be prevented from escaping from the left and right limits of the two limit ribs, thereby improving the stability of the left and right limits.

[0019] 2. The swing range of the front end of the flexible part is limited by the cooperation of the side ribs and the movable hole, which improves the stability of the paper discharge after the paper end passes through the front end of the flexible part. At the same time, the paper discharge at the paper end is limited to the left and right through the guide groove, which corresponds to the left and right limits of the limit ribs. Together, the front and rear parts of the paper end are limited to the left and right, which improves the stability of the paper discharge from the paper outlet and avoids the deviation of the paper end after being pulled, thereby ensuring the printing stability of the label printer.

[0020] 3. The setting of the limit frame can prevent the label roll from rotating and causing the paper end to deviate left and right when the paper is discharged toward the front side, which may cause the rear side of the paper end to deviate left and right and break. The left and right limit of the front, middle and rear parts of the paper end can be achieved through the guide slot, limit ribs and limit frame, which further improves the stability of the left and right limit and front and rear guide of the paper end.

[0021] 4. By setting the limit rod and the support wheel, the label roll can be rotated and mounted in the paper slot, so that the output of the paper output end is not affected by the weight of the label roll and the friction between the paper slot, the paper output is smoother, and when the outer diameter of the label roll is gradually reduced, it can still be stably located in the middle of the paper slot, which can prevent the label roll from running back and forth in the paper slot, improve the stability of the label roll paper output, and then improve the stability of the paper output at the paper output end.

[0022] 5. When using a small-sized label roll, the adjusting piece can be flipped downward to limit the paper outlet end of the small-sized label roll to the left and right through the limiting channel formed between the adjusting slot and the supporting part, thereby improving the adaptability of the label printer and enriching the selectivity of the label roll; at the same time, by adding two cams and adjusting threads, under the premise of avoiding affecting the use of large-sized label rolls, when using a small-sized label roll, the small-sized label roll can be limited to the left and right after being screwed and fixed to the supporting part by the cam, thereby avoiding the small-sized label roll from deviating to the left and right in the paper slot, causing the rear side of the paper outlet end to deviate to the left and right and break, thereby realizing the left and right limiting of the front, middle and rear parts of the paper outlet end of the small-sized label roll through the guide slot, the adjusting slot and the cam, thereby improving the stability of the label printer when using small-sized label rolls and further improving the adaptability of the label printer.

[0023] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the explosion structure of Example 1.

[0025] Figure 2 It is a schematic cross-sectional structure diagram of the first embodiment.

[0026] Figure 3 It is a schematic diagram of the structure of the support frame, printing mechanism and driving device.

[0027] Figure 4 for Figure 3 Schematic diagram of the explosion structure.

[0028] Figure 5 It is a schematic diagram of the cross-sectional partial structure of the second embodiment.

[0029] Figure 6 It is a schematic diagram of the structure of the limit rod, support wheel, cam, and large-size label roll.

[0030] Figure 7 It is a schematic diagram of the structure of the limit rod, support wheel and cam when used for large-size label roll paper.

[0031] Figure 8 It is a structural schematic diagram of the adjusting part.

[0032] Fig. 9 It is a schematic diagram of the structure of the limit rod, support wheel, cam, and small-size label roll.

[0033] Fig.10 It is a schematic diagram of the structure of the limit rod, support wheel and cam when used for small-size label roll paper. DETAILED DESCRIPTION

[0034] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the accompanying drawings:

[0035] Embodiment 1

[0036] refer to Figure 1-4 , a high stability label printer, comprising:

[0037] The housing 1 is provided with a top opening and a movable cover 2, a paper slot 11 for accommodating a corresponding label roll 7 is provided at the rear side of the housing 1, and a paper outlet is provided between the top cover 2 and the front side of the housing 1; specifically, the movable cover is rotatably connected to the rear end of the housing 1;

[0038] The support frame 3 is detachably arranged at the front side of the inner part of the housing 1, the middle part of the support frame 3 is recessed to form a guide area extending forward and backward, the rear part of the guide area is tilted backward and extends downward to form a guide part 31 corresponding to the front end of the bottom of the paper slot 11 at the rear end, and the front part is gradually offset downward to form a mounting part 32 and abutting part 33 in sequence, and a mounting port 321 communicating with the bottom side of the guide part 31 is penetrated on one side of the mounting part 32 close to the guide part 31; specifically, the support frame 3 is screwed and arranged in the housing 1;

[0039] The printer mechanism 4 includes a flexible member 41 placed on the mounting portion 32 and spaced at the front above the abutment portion 33, a paper guide roller 42 driven by the driving device 5 to rotate forward and backward, and an elastic member 43 disposed between the abutment portion 33 and the front of the flexible member 41. In this embodiment, the elastic member 43 is a spring, and can also be other elastic parts such as a spring sheet. The top surface of the flexible member 41 is adapted to the slope of the top surface of the guide portion 31 and the front end corresponds to the paper outlet. The rear end of the flexible member 41 is limitedly inserted into the mounting port 321 by the mounting rib 411, and the front is provided with a member driven by the abutment portion 33. The elastic force of the elastic member 43 acts on the print head 412 which is supported on the outer wall of the paper guide roller 42; the top protrusion of the guide portion 31 is provided with limiting ridges 311 corresponding to the left and right ends of the paper guide roller 42, and the inner side of the top cover 2 is provided with a paper pressing portion 211 which extends downward to the gap above the guide portion 31 and is located between the two limiting ridges 311; the paper output end of the label roll 7 is guided front and back through the guide portion 31 and the flexible member 41 to between the paper guide roller 42 and the print head 412, and is limited left and right by the two limiting ridges 311, and limited up and down by the paper pressing portion 211 and the guide portion 31.

[0040] The design of the above structure, through the setting of the support frame 3, during the printing process, the paper outlet end of the label paper roll 7 is limited in the left and right directions and the up and down directions, and stably guided in the front and back directions through the cooperation of the guide part 31 and the limiting ridges 311 and the paper pressing part 211, ensuring that the paper outlet end is always facing the paper guide roller 42, and the paper guide roller 42 drives the paper outlet end to move forward through the print head 412 without deviation, thereby avoiding the occurrence of skewed printed content or paper jam of the label paper roll 7, thereby improving the printing quality and printing stability of the label printer; at the same time, through the setting of the paper pressing part 211, when the label paper roll 7 is over-unrolled in the mobile label printer, the paper outlet end can be prevented from escaping from the left and right limits of the two limiting ridges 311, thereby improving the stability of the left and right limits.

[0041] In order to improve the paper discharge stability of the paper outlet, the left and right side walls of the support frame 3 are provided with movable holes 34, the left and right side protrusions of the front of the flexible member 41 are provided with side ribs 413 that are movable and located in the movable holes 34, and the front side of the housing 1 is provided with a guide groove 12 whose bottom extends downward and tilts backward and whose rear end corresponds to the front end of the flexible member 41, and the width of the guide groove 12 corresponds to the spacing between the two limiting ribs 311, and the paper outlet is formed between the front side of the guide groove 12 and the front side of the top cover 2. Thus, the swing range of the front end of the flexible member 41 is limited by the cooperation of the side ribs 413 and the movable hole 34, and the stability of the paper discharge after the paper discharge end passes through the front end of the flexible member 41 is improved. At the same time, the paper discharge of the paper discharge end is limited to the left and right through the guide groove 12, so that it corresponds to the left and right limit of the limiting ribs 311, and the front and rear parts of the paper discharge end are limited to the left and right together, thereby improving the stability of the paper discharge of the paper outlet, and avoiding the situation that the paper discharge end is offset after being pulled, thereby ensuring the printing stability of the label printer.

[0042] In order to improve the convenience of installation of the label roll 7, the tops of the left and right side walls of the support frame 3 are recessed to form limiting grooves 35, the inner side of the top cover 2 is provided with a pressing portion 21 extending downward and the lower end folded backward to form the paper pressing portion 211, the left and right sides of the pressing portion 21 are folded forward to form a mounting portion 212 in which the paper guide roller 42 is rotatably mounted, and the two ends of the paper guide roller 42 are limited in the limiting grooves 35, and the driving device 5 includes a linkage gear 51 provided at one end of the paper guide roller 42 and located on the outside of the mounting portion 212, a transmission gear 52 rotatably provided at one side of the support frame 3 and meshing with the linkage gear 51, and a driving end is driven by the driving gear 51. 3 meshes with the motor 54 of the transmission gear 52; after the top cover 2 is opened, the mounting portion 212 drives the paper guide roller 42 to disengage from the print head 412 and the limiting groove 35, and the linkage gear 51 disengages from the transmission gear 52, so that when installing the label roll 7, the user can directly put the label roll 7 into the paper slot 11, and then pull the paper outlet end of the label roll 7 through the support portion 361, the flexible member 41, the guide slot 12, and the paper outlet, and finally cover the top cover 2, the paper guide roller 42 is driven to be pressed onto the printer head, and the paper pressing portion 211 is driven to move down to the gap above the support portion 361, so that the installation and replacement of the label roll 7 can be completed very conveniently.

[0043] In order to further improve the stability of the label printer, the paper slot 11 is used to vertically accommodate the label paper roll 7. The left and right inner wall protrusions of the paper slot 11 are provided with limit frames 111 corresponding to the two limit ribs 311 respectively. The limit frames 111 are used to limit the label paper roll 7 to the left and right, thereby preventing the label paper roll 7 from rotating to cause the paper outlet end to deviate to the left and right when discharging paper toward the front side, resulting in the rear side of the paper outlet end deviating to the left and right and breaking. Then, the left and right limitation of the front, middle and rear parts of the paper outlet end is achieved through the guide slot 12, the limit ribs 311 and the limit frame 111, further improving the stability of the left and right limitation and front and rear guidance of the paper outlet end.

[0044] In order to improve the stability of the label roll 7 in the paper slot 11, the upper ends of the two limiting ridges 311 are respectively rotatably provided with limiting rods 36 extending toward the rear side and mounted on the limiting frame 111, and the rear ends of the two limiting rods 36 are folded toward each other to form a support portion 361 in the reel 71 in the middle of the label roll 7, and a support wheel 37 that is supported on the top of the reel 71 for front and rear rolling support is rotatably sleeved between the two supporting portions 361. Specifically, the left and right outer walls of the supporting wheel 37 are recessed with rotation holes, and the supporting portion 36 The ends of 1 are rotated and inserted into the corresponding rotating holes. When the label roll 7 needs to be replaced, the top cover 2 is opened and the two limit rods 36 are rotated upward to extend out of the casing 1, and then the two support parts 361 are opened to remove the old roll 71, and then the roll 71 of the new label roll 7 is put onto the outside of the supporting wheel 37, and then the two support parts 361 are rotated toward each other and inserted into the rotating holes on both sides of the supporting wheel 37, and finally the new label roll 7 is put into the paper slot 11 and the two limit rods 36 are mounted on the limit frame 111. Therefore, by setting the limiting rod 36 and the supporting wheel 37, the label roll 7 can be rotatably mounted in the paper slot 11, so that the output of the paper outlet end is not affected by the weight of the label roll 7 and the friction between the label roll 7 and the paper slot 11, and the paper outlet is smoother. When the outer diameter of the label roll 7 is gradually reduced during use, it can still be stably located in the middle of the paper slot 11, which can prevent the label roll 7 from running back and forth in the paper slot 11, thereby improving the stability of the paper outlet of the label roll 7 and further improving the stability of the paper outlet at the paper outlet end.

[0045] Embodiment 2

[0046] Since the label roll 7 has two specifications with different widths, the above-mentioned limit ribs 311 can be adapted to the left and right limit of the large-size label roll 7 with a larger width, but cannot be adapted to the left and right limit of the small-size label roll 7 with a smaller width. Figure 5-10 The difference between this embodiment and the first embodiment is that:

[0047] In order to limit the paper outlet end of the small-sized label roll 7 to the left and right, the label printer also includes an adjusting member 6 that is rotatably arranged at one end with respect to the rear side of the pressing part 21, and the other end of the adjusting member 6 extends upward and is magnetically attracted to the opposite side of the pressing part 21 through a magnetic attraction portion 62. Specifically, the magnetic attraction portion 62 can be made of a material such as a magnet, and the pressing part 21 can be partially fixed with a sheet that can be attracted by the magnet; the left and right sides of the adjusting member 6 are folded backward to form an adjusting groove 61 whose bottom is adapted to the paper pressing part 211; the other end of the adjusting member 6 is released After leaving the pressing part 21 and swinging down to the adjusting groove 61 to be buckled on the paper pressing part 211, the notch of the adjusting groove 61 is inserted between the limiting ridge 311 and the paper pressing part 211 and abuts against the guide part 31 to form a limiting channel, so that when using a small-size label roll 7, the adjusting member 6 can be flipped downward to adapt the paper outlet end of the small-size label roll 7 to the left and right through the limiting channel formed between the adjusting groove 61 and the supporting part 361, thereby improving the adaptability of the label printer and enriching the selectivity of the label roll 7.

[0048] In order to limit the left and right positions of the small-sized label roll 7, the two support parts 361 are respectively coaxially arranged with the corresponding limiting ridges 311 after being limited by the inner wall of the paper slot 11, and the outer walls of the two support parts 361 at the far ends thereof are provided with adjustment threads 362, and the two support parts 361 are respectively rotatably sleeved with cams 38 located on the left and right sides of the support wheel 37 and having threaded holes on the inner walls; specifically, when using a large-sized label roll 7, the cam 38 rotates downward at its protruding end under the action of its own weight. In the roll 71 of the large-size label paper roll 7, when using the small-size label paper roll 7, first open the two support parts 361 in opposite directions during installation, rotate the two cams 38 toward the opposite sides and screw them through the threaded holes to the corresponding adjusting threads 362, then put the roll 71 of the small-size label paper roll 7 to the outside of the support wheel 37, and then rotate the two support parts 361 towards each other and insert them into the rotating holes on both sides of the support wheel 37, so that the two cams 38 are radially limited and blocked on the left and right outsides of the roll 71. Therefore, by adding two cams 38 and an adjusting thread 362, while avoiding affecting the use of a large-size label roll 7, when using a small-size label roll 7, the small-size label roll 7 can be limited to the left and right after being screwed and fixed to the cam 38 and the support portion 361, thereby avoiding the small-size label roll 7 from shifting left and right in the paper slot 11, causing the rear side of the paper outlet end to shift left and right and break. The left and right limiting of the front, middle and rear positions of the paper outlet end of the small-size label roll 7 is achieved through the guide slot 12, the adjusting slot 61 and the cam 38, thereby improving the stability of the label printer when using the small-size label roll 7 and further improving the adaptability of the label printer.

[0049] It should be pointed out that the implementation principle and technical effects of this embodiment are the same as those of Embodiment 1. For the sake of brief description, for matters not mentioned in this embodiment, reference may be made to the corresponding contents in Embodiment 1.

[0050] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A highly stable label printer, characterized in that: include: A casing (1) is provided with an opening at the top and a movable cover (2), a paper slot (11) for accommodating a corresponding label roll (7) is provided at the rear side of the casing (1), and a paper outlet is provided between the top cover (2) and the front side of the casing (1); A support frame (3) is detachably arranged on the front side of the housing (1), the middle part of the support frame (3) is recessed to form a guide area extending forward and backward, the rear part of the guide area is tilted and extends downward to form a guide part (31) corresponding to the front end of the bottom of the paper slot (11), and the front part is gradually offset downward to form a mounting part (32) and abutting part (33) in sequence, and a mounting opening (321) communicating with the bottom side of the guide part (31) is provided through a side of the mounting part (32) close to the guide part (31); A printer mechanism (4) comprises a flexible member (41) placed on the mounting portion (32) and spaced in front above the abutting portion (33), a paper guide roller (42) driven by a driving device (5) to rotate forward and backward, and an elastic member (43) disposed between the abutting portion (33) and the front of the flexible member (41), wherein the top surface of the flexible member (41) is adapted to the slope of the top surface of the guide portion (31) and the front end corresponds to the paper outlet, the rear end of the flexible member (41) is limitedly inserted into the mounting opening (321) by a mounting ridge (411), and the front end is provided with a paper guide roller (42) disposed on the top of the abutting portion (33) under the elastic force of the elastic member (43). 2) a print head (412) on the outer wall; the top of the guide portion (31) is protruded with limit ridges (311) corresponding to the left and right ends of the paper guide roller (42); the inner side of the top cover (2) is provided with a paper pressing portion (211) extending downward to a gap arranged above the guide portion (31) and located between the two limit ridges (311); the paper outlet end of the label roll (7) is guided front and back through the guide portion (31) and the flexible member (41) to between the paper guide roller (42) and the print head (412), and is limited left and right by the two limit ridges (311), and is limited up and down by the paper pressing portion (211) and the guide portion (31).

2. A highly stable label printer as claimed in claim 1, characterized in that: The left and right side walls of the support frame (3) are provided with movable holes (34); the left and right side protrusions of the front part of the flexible member (41) are provided with side ridges (413) which are movablely located in the movable holes (34); the front side of the housing (1) is provided with a guide groove (12) whose bottom extends downwardly and obliquely toward the rear and whose rear end corresponds to the front end of the flexible member (41); the width of the guide groove (12) corresponds to the spacing between the two limiting ridges (311); and the paper outlet is formed between the front side of the guide groove (12) and the front side of the top cover (2).

3. A highly stable label printer as claimed in claim 1, characterized in that: The tops of the left and right side walls of the support frame (3) are recessed to form limiting grooves (35); the inner side of the top cover (2) is provided with a pressing portion (21) extending downward and having its lower end folded backward to form the paper pressing portion (211); the left and right sides of the pressing portion (21) are folded forward to form a mounting portion (212) on which the paper guide roller (42) is rotatably mounted; both ends of the paper guide roller (42) are limitedly located in the limiting grooves (35); the driving device (5) comprises a driving device (5) provided at one end of the paper guide roller (42) and positioned A linkage gear (51) is arranged outside the mounting portion (212), a transmission gear (52) is rotatably arranged on one side of the support frame (3) and meshed with the linkage gear (51), and a motor (54) whose driving end meshes with the transmission gear (52) through a driving gear (53); after the top cover (2) is opened, the mounting portion (212) drives the paper guide roller (42) to disengage from the print head (412) and the limiting groove (35), and the linkage gear (51) disengages from the transmission gear (52).

4. A highly stable label printer as claimed in claim 1, characterized in that: The paper slot (11) is used to vertically accommodate the label paper roll (7); the left and right inner wall protrusions of the paper slot (11) are provided with limit frames (111) corresponding to the two limit ridges (311) respectively; the limit frames (111) are used to limit the label paper roll (7) to the left and right.

5. A highly stable label printer as claimed in claim 4, characterized in that: The upper ends of the two limiting ridges (311) are respectively rotatably provided with limiting rods (36) extending toward the rear side and mounted on the limiting frame (111); the rear ends of the two limiting rods (36) are folded toward each other to form a support portion (361) in the reel (71) in the middle of the label roll (7); and a support wheel (37) is rotatably sleeved between the two supporting portions (361) and is supported on the top of the reel (71) in a front-rear rolling manner.

6. A highly stable label printer as claimed in claim 5, characterized in that: The two support parts (361) are respectively coaxially arranged with the corresponding limiting ridges (311) after being limited by the inner wall of the paper slot (11); the outer walls of the two support parts (361) at the far ends thereof are provided with adjusting threads (362); the two support parts (361) are respectively rotatably sleeved with cams (38) located on the left and right sides of the support wheel (37) and having threaded holes on the inner walls thereof; the two cams (38) are used to rotate toward the far sides thereof and be screwed through the threaded holes to be screwed with the corresponding adjusting threads (362), and then be radially limited and blocked on the left and right outer sides of the reel (71).

7. A highly stable label printer as claimed in claim 3, characterized in that: It also comprises an adjusting member (6) with one end being arranged to rotate up and down with the rear side of the pressing part (21); the other end of the adjusting member (6) extending upward and being magnetically attracted to the opposite side of the pressing part (21) through a magnetic attraction part (62); the left and right sides of the adjusting member (6) are folded backward to form an adjusting groove (61) whose bottom is adapted to the paper pressing part (211); after the other end of the adjusting member (6) is separated from the pressing part (21) and swings down to the adjusting groove (61) to be buckled on the paper pressing part (211), the notch of the adjusting groove (61) is inserted between the limiting rib (311) and the paper pressing part (211) and abuts against the guide part (31) to form a limiting channel.

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