Cutter fixing mechanism of thermal printer

Abstract

The invention discloses a cutter fixing mechanism of a thermal printer. The cutter fixing mechanism comprises a plastic upper shell of the printer, a driving motor, a worm, a worm gear, a microswitch, a plastic lower shell, a pressing piece, a support and a blade. The driving motor and the microswitch are arranged on the lower side face of the plastic upper shell, the worm wheel is rotatably arranged on the lower side face of the plastic upper shell, the driving motor is meshed with the worm wheel through the worm, a protruding block acting with a contact of the microswitch is arranged on the upper side of the worm wheel, and a stirring protruding column is arranged on the lower side of the worm wheel. The pressing piece is arranged on the upper side face of the lower plastic shell, the support is arranged between the lower plastic shell and the pressing piece in a front-back sliding mode, and the blade is arranged on the front side of the support. The support is provided with a transverse groove, and the end of the shifting protruding column extends into the transverse groove. The thermal printer cutter module has the advantages that a metal plate upper shell and a metal plate lower shell in an existing cutter module are omitted, the space of a thermal printer is integrally simplified, and meanwhile the cost of the thermal printer is saved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal printers, and in particular to a cutter fixing mechanism of a thermal printer. Background Art

[0002] Traditional thermal printer cutter modules generally adopt sheet metal shell integrated structure design, and its typical structure includes sheet metal upper shell, sheet metal lower shell, micro switch, drive motor, worm gear, worm, blade, blade bracket, pressing sheet, etc. In the actual assembly process, the cutter module needs to be fixed as a whole in the space below the inner side of the printer's plastic upper shell, and an independent installation position is reserved below it to fix the printing rubber roller assembly.

[0003] However, the above structure has the following technical defects:

[0004] 1. Low space utilization. The sheet metal shell and the plastic shell form a double shell nesting, which increases the thickness of the device and makes it difficult to meet the design requirements of ultra-thin printers.

[0005] 2. Cost redundancy. The special sheet metal shell needs to be manufactured separately, and the material cost and surface treatment process (such as electroplating anti-rust) further increase the overall cost.

[0006] In view of the above problems, a de-shelled and highly integrated cutter module design is urgently needed to achieve technical effects such as simplified structure and cost optimization. Summary of the invention

[0007] To this end, the present invention provides a cutter fixing mechanism for a thermal printer to solve one or more of the above problems.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A cutter fixing mechanism for a thermal printer, comprising a plastic upper shell of the printer, a drive motor, a worm, a worm gear, a micro switch, a plastic lower shell, a pressing sheet, a bracket, and a blade;

[0010] The drive motor and the micro switch are arranged on the lower side of the plastic upper shell, the worm wheel is rotatably arranged on the lower side of the plastic upper shell, the drive motor is meshed with the worm wheel through the worm, a convex block that interacts with the contact of the micro switch is arranged on the upper side of the worm wheel, and a toggle convex column is arranged on the lower side of the worm wheel;

[0011] The pressing sheet is arranged on the upper side of the plastic lower shell, the bracket is arranged between the plastic lower shell and the pressing sheet in a slidable manner forward and backward, and the blade is arranged on the front side of the bracket;

[0012] Among them, the plastic lower shell is arranged on the lower side of the plastic upper shell and forms an accommodating cavity between the two to enclose the drive motor, worm, worm gear, micro switch, pressure piece, bracket, and blade inside the accommodating cavity, and a slot for the blade to enter and exit is reserved on the front side of the accommodating cavity. A plastic part with a C-shaped slot for installing a rubber roller is arranged on the front part of the lower side of the plastic lower shell; the bracket is provided with a transverse groove, and the end of the toggle boss extends into the transverse groove.

[0013] Furthermore, a convex plate protruding downward is provided on the lower side of the plastic upper shell, and the driving motor is fixed to the convex plate by screws.

[0014] Furthermore, an embedding hole is provided on the lower side of the plastic upper shell, and a mounting column is fixedly installed in the embedding hole. The lower end of the mounting column protrudes downward and an annular groove is provided at the lower end of the mounting column; the worm gear is rotatably mounted on the mounting column and limited by a retaining spring installed at the groove.

[0015] Furthermore, the protrusion includes an annular portion coaxial with the worm gear and a protruding portion integrally provided on one side of the annular portion, the connection between the protruding portion and the annular portion is smoothly transitioned, and one end of the protruding portion away from the annular portion is arc-shaped.

[0016] Furthermore, the shifting boss is a circular column or a pin, and the axis of the circular column or the pin is not colinear with the axis of the worm gear.

[0017] Furthermore, the pressing plate is connected to the plastic lower shell by screws, and the pressing plate is an elastic metal part. The elastic metal part presses the bracket downward, and a downwardly protruding guide column is provided on the lower side of the bracket; a guide groove extending in the front-to-back direction is provided on the upper side surface of the plastic lower shell, and the end of the guide column extends into the guide groove.

[0018] Furthermore, the pressing sheet is connected to a grounding terminal, the pressing sheet is in contact with the bracket, the bracket is in contact with the blade, the blade, the bracket and the pressing sheet are all made of conductive materials, and the grounding terminal conducts static electricity of the blade through a grounding wire.

[0019] Furthermore, the blade is fixedly connected to the bracket.

[0020] Furthermore, the plastic upper shell and the plastic lower shell are fixed by screws.

[0021] The present invention has the following advantages:

[0022] The sheet metal upper shell and the sheet metal lower shell in the existing cutter module are cancelled, and the driving motor, the worm gear, and the microswitch are directly fixed on the plastic upper shell of the thermal printer itself; the sheet metal lower shell is cancelled and replaced with a plastic lower shell, and a plastic part is arranged at the front part of the lower side of the plastic lower shell, and the rubber roller can be directly fixed on the plastic part; the space of the thermal printer is overall streamlined, and at the same time, the cost of the thermal printer is saved.

[0023] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present application will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can be obtained by extension based on the provided drawings without creative efforts.

[0025] The structures, ratios, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present invention can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0026] Figure 1 It is a schematic structural diagram of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention;

[0027] Figure 2 It is a schematic structural diagram of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention with a rubber roller installed;

[0028] Figure 3 It is an exploded view of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention;

[0029] Figure 4 It is an exploded view of another view direction of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention;

[0030] Figure 5 It is a schematic structural diagram of the plastic upper shell of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention;

[0031] Figure 6 ForFigure 5 A magnified view of middle;

[0032] Figure 7 A schematic structural diagram of a worm gear of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention (two worm gears are shown in the figure, one on the front and the other on the back);

[0033] Figure 8 A schematic diagram of the installation and assembly of a micro switch of a cutter fixing mechanism of a thermal printer on a plastic upper shell provided by an embodiment of the present invention;

[0034] Figure 9 A schematic diagram of the assembly of a plastic upper shell, a drive motor, a worm gear, and a worm of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention (the micro switch is covered or hidden);

[0035] Figure 10 A schematic structural diagram of a plastic lower shell of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention;

[0036] Figure 11 A schematic diagram of the assembly of a bracket and a blade of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention;

[0037] Figure 12 A schematic diagram of another view of the assembled bracket and blade of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention;

[0038] Figure 13 A schematic diagram of the assembly of a plastic lower shell, a pressing sheet, a bracket, and a blade of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention;

[0039] Figure 14 A bottom view of a cutter fixing mechanism of a thermal printer provided by an embodiment of the present invention, with the plastic lower shell imaginarily removed.

[0040] In the figure: 1. plastic upper shell; 11. convex plate; 12. mounting column; 13. retaining spring; 14. concentric ring convex ring; 2. driving motor; 3. worm; 4. worm gear; 41. convex block; 42. toggle convex column; 5. micro switch; 51. contact; 6. plastic lower shell; 61. C-shaped slot; 62. guide slot; 7. pressing piece; 71. grounding terminal; 8. bracket; 81. transverse slot; 82. guide column; 83. L-shaped plate; 9. blade. DETAILED DESCRIPTION

[0041] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0042] like Figures 1-14 As shown, this embodiment provides a cutter fixing mechanism for a thermal printer, which includes a plastic upper shell 1 of the printer, a drive motor 2, a worm 3, a worm gear 4, a micro switch 5, a plastic lower shell 6, a pressing sheet 7, a bracket 8, and a blade 9.

[0043] The drive motor 2 and the micro switch 5 are arranged on the lower side of the plastic upper shell 1, and the worm gear 4 is rotatably arranged on the lower side of the plastic upper shell 1. The drive motor 2 is engaged with the worm gear 4 through the worm 3. The upper side of the worm gear 4 is provided with a protrusion 41 that acts on the contact 51 of the micro switch 5, and the lower side of the worm gear 4 is provided with a toggle protrusion 42.

[0044] The pressing sheet 7 is arranged on the upper side of the plastic lower shell 6 , the bracket 8 is arranged between the plastic lower shell 6 and the pressing sheet 7 so as to be slidable forward and backward, and the blade 9 is arranged on the front side of the bracket 8 .

[0045] Among them, the plastic lower shell 6 is arranged on the lower side of the plastic upper shell 1 and forms an accommodating cavity between the two to enclose the drive motor 2, the worm 3, the worm wheel 4, the micro switch 5, the pressing piece 7, the bracket 8, and the blade 9 inside the accommodating cavity. A slot for the blade 9 to enter and exit is reserved on the front side of the accommodating cavity. A plastic part with a C-shaped slot 61 for installing a rubber roller is arranged on the front part of the lower side of the plastic lower shell 6; the bracket 8 is provided with a transverse groove 81, and the end of the toggle boss 42 extends into the transverse groove 81.

[0046] The cutter fixing mechanism provided in the present embodiment replaces the sheet metal upper shell of the cutter module of the thermal printer in the prior art with the plastic upper shell 1 of the thermal printer, and the sheet metal lower shell station plastic lower shell 6 is installed in the accommodating cavity formed by the plastic lower shell 6 and the plastic upper shell 1. On the one hand, the sheet metal upper shell is directly omitted, the thickness of the equipment is reduced, and it is conducive to realizing the design requirements of the ultra-thin printer. On the other hand, the omitted sheet metal upper shell and the replaced plastic lower shell 6 can reduce the surface treatment process and reduce the manufacturing cost. Moreover, by arranging a plastic part with a C-shaped slot 61 on the front part of the lower side of the plastic lower shell 6, the rubber roller can be clamped into the C-shaped slot 61, which is convenient for installing the rubber roller.

[0047] In this embodiment, the drive motor 2 is directly fixed to the lower side of the plastic upper shell 1. In an alternative embodiment, a convex plate 11 protruding downward is provided on the lower side surface of the plastic upper shell 1. The convex plate 11 is provided with a perforation, and the drive motor 2 is provided with a threaded hole corresponding to the perforation. The drive motor 2 is fixed to the convex plate 11 by screws; since the convex plate 11 is integrally formed on the lower side surface of the plastic upper shell 1, the direct fixation of the drive motor 2 and the plastic upper shell 1 is completed. In an alternative embodiment, in addition to the convex plate 11 for screwing the screws, a limit clamping plate surrounding the drive motor 2 is further provided on the lower surface of the plastic upper shell 1 at the position corresponding to the installation of the drive motor 2. The drive motor 2 is initially clamped and fixed to the lower surface of the plastic upper shell 1 by the limit clamping plate, and then fixed by screws, which is convenient for installation.

[0048] In this embodiment, the motor shaft and the worm 3 extend horizontally (nearly parallel to the plastic upper shell 1), and the worm wheel 4 is placed flat under the plastic upper shell 1. Through the worm wheel 4 and the worm 3, the power output by the drive motor 2 rotating around the horizontal axis is changed into the power rotating around the vertical axis (referring to the axis nearly perpendicular to the plastic upper shell 1). Therefore, the worm wheel 4 needs to be connected to the plastic upper shell 1 through a vertical shaft. In an alternative embodiment, an inlay hole is provided on the lower side surface of the plastic upper shell 1. The upper end of the mounting post 12 is fixedly inserted into the inlay hole, the lower end of the mounting post 12 protrudes downward, and a circumferential clamping groove is provided at the lower end of the mounting post 12; the worm wheel 4 is rotatably sleeved on the mounting post 12. After being sleeved, a snap spring 13 is installed in the clamping groove, and the snap spring 13 is used to realize the limit of the worm wheel 4 along the direction of the mounting post 12. In an alternative embodiment, the mounting post 12 is integrally formed under the plastic upper shell 1.

[0049] In this embodiment, the protrusion 41 rotates with the worm wheel 4. For each rotation, the protrusion 41 touches the contact 51 at least once, and the micro switch 5 is triggered once. If necessary, multiple protrusions 41 can also be provided. The contact 51 is triggered multiple times when the worm wheel 4 rotates one circle. The protrusion 41 contacts the contact 51 intermittently, and it is necessary to reduce the impact force between the protrusion 41 and the contact 51 to avoid damage to the contact 51. In an optional embodiment, the protrusion 41 includes an annular portion coaxial with the worm wheel 4 and a protrusion integrally arranged on one side of the annular portion. The connection between the protrusion and the annular portion is smoothly transitioned, and the end of the protrusion away from the annular portion is in the shape of an arc. In an optional embodiment, the connection between the protrusion on the side facing the contact 51 and the annular portion adopts an involute curve transition, that is, the protrusion can be regarded as a solid protrusion formed on one side of the annular portion according to the involute curve. In order to ensure that the protrusion 41 slides (rotates) smoothly against the plastic upper shell 1, the plastic upper shell 1 is provided with two concentric ring convex rings 14, which correspond to the rotation trajectory of the protrusion 41. The upper surface of the protrusion 41 can be against the lower surface of the concentric ring convex ring 14. On the one hand, the concentric ring convex ring 14 is used to limit the protrusion 41 (that is, to limit the worm gear 4), and on the other hand, the contact area between the convex ring and the lower side surface of the plastic upper shell 1 is reduced to reduce friction and provide a smooth slideway (track) for the protrusion 41. It should be noted that the spacing between the retaining ring 13 and the concentric ring convex ring 14 should be slightly smaller than the sum of the thicknesses of the worm gear 4 and the protrusion 41.

[0050] In this embodiment, the axis of the toggle boss 42 is not colinear with the axis of the worm wheel 4, so that as the worm wheel 4 rotates, the toggle boss 42 acts in the transverse groove 81 of the bracket 8 to enable the bracket 8 to move in the front-to-back direction (the front-to-back direction sliding limit of the bracket 8 is described below). In an optional embodiment, the toggle boss 42 is a circular column or a pin.

[0051] In this embodiment, the pressing piece 7 is connected to the plastic lower shell 6 by screws, the lower side of the bracket 8 is provided with a downwardly protruding guide column 82, and the upper side of the plastic lower shell 6 is provided with a guide groove 62 extending in the front-to-back direction, and the end of the guide column 82 extends into the guide groove 62, so as to ensure that the bracket 8 and the blade 9 can only move forward and backward; the pressing piece 7 is used to press the bracket 8 downward (i.e., press the bracket 8 toward the side close to the plastic lower shell 6) and prevent the blade 9 from detaching from the bracket 8 (the connection between the blade 9 and the bracket 8 is introduced below), so the pressing piece 7 should have a certain elasticity. In an optional embodiment, the pressing piece 7 is an elastic metal part, which provides elastic pressure on the one hand and requires the electrostatic derivation system of the blade 9 on the other hand (the electrostatic derivation function is described below).

[0052] In this embodiment, the pressing sheet 7 is connected to a grounding terminal 71, the pressing sheet 7 is in contact with the bracket 8, the bracket 8 is in contact with the blade 9, the blade 9, the bracket 8, and the pressing sheet 7 are all made of conductive materials, and the grounding terminal 71 conducts the static electricity of the blade 9 through the grounding wire to avoid the harm caused by static electricity.

[0053] In this embodiment, the blade 9 is fixedly engaged with the bracket 8. When engaged, the blade 9 is pressed against the bracket 8 from above and then moves backward for a distance, so that parts of the blade 9 are engaged in a U-shaped groove provided on the upper side of the bracket 8, and the U-shaped groove is formed by an L-shaped plate 83 integrally formed on the upper side of the bracket 8.

[0054] In this embodiment, the plastic upper shell 1 and the plastic lower shell 6 are fixed by screws, and the micro switch 5 is directly fixed to the lower surface of the plastic upper shell 1 by screws.

[0055] Working principle: when the driving motor 2 rotates, the worm 3 drives the worm wheel 4 to rotate, and the driving boss 42 of the worm 3 rotates with the worm wheel 4 (rotates around the mounting column 12). At the same time, the driving boss 42 moves in the transverse groove 81 of the bracket 8, and the guide column 82 of the bracket 8 is restricted by the guide groove 62 of the plastic lower shell 6. Therefore, the bracket 8 is driven by the driving boss 42 to make a reciprocating motion along the guide groove 62 in the front and rear directions, thereby driving the blade 9 to move back and forth in the front and rear directions. The front end of the blade 9 extends or retracts from the notch of the accommodating cavity formed by the plastic upper shell 1 and the plastic lower shell 6, thereby realizing the paper cutting action of the cutter.

[0056] In the description of this specification, 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", "axial", "radial", "circumferential" 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 application 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 application.

[0057] 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 technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0058] In this application, unless otherwise clearly defined or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In this application, unless otherwise clearly defined or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0060] The above disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, components and settings of specific examples are described above. Of course, they are only examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed.

[0061] As described above, the above are only specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of various changes or substitutions, and these should all be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A cutter fixing mechanism for a thermal printer, characterized in that: The printer comprises a plastic upper shell (1), a driving motor (2), a worm (3), a worm gear (4), a micro switch (5), a plastic lower shell (6), a pressing sheet (7), a bracket (8), and a blade (9); The drive motor (2) and the micro switch (5) are arranged on the lower side of the plastic upper shell (1); the worm wheel (4) is rotatably arranged on the lower side of the plastic upper shell (1); the drive motor (2) is meshed with the worm wheel (4) through the worm (3); a convex block (41) that interacts with a contact (51) of the micro switch (5) is arranged on the upper side of the worm wheel (4); and a toggle convex column (42) is arranged on the lower side of the worm wheel (4); The pressing sheet (7) is arranged on the upper side of the plastic lower shell (6), the bracket (8) is arranged between the plastic lower shell (6) and the pressing sheet (7) in a manner that the bracket (8) can slide forward and backward, and the blade (9) is arranged on the front side of the bracket (8); The plastic lower shell (6) is arranged on the lower side of the plastic upper shell (1) and forms a receiving cavity therebetween to enclose the drive motor (2), the worm (3), the worm wheel (4), the micro switch (5), the pressing sheet (7), the bracket (8) and the blade (9) inside the receiving cavity; a notch for the blade (9) to enter and exit is reserved at the front side of the receiving cavity; a C-shaped slot (61) for mounting a rubber roller is arranged at the front of the lower side of the plastic lower shell (6); the bracket (8) is provided with a transverse groove (81), and the end of the toggle boss (42) extends into the transverse groove (81).

2. The cutter fixing mechanism according to claim 1, characterized in that: A convex plate (11) protruding downward is provided on the lower side of the plastic upper shell (1), and the drive motor (2) is fixed to the convex plate (11) by means of screws.

3. The cutter fixing mechanism according to claim 1, characterized in that: The lower side of the plastic upper shell (1) is provided with an inlay hole, in which a mounting column (12) is fixedly installed, the lower end of the mounting column (12) protrudes downward and an annular groove is provided at the lower end of the mounting column (12); the worm wheel (4) is rotatably sleeved on the mounting column (12) and is limited by a retaining spring (13) installed at the groove.

4. The cutter fixing mechanism according to claim 1, characterized in that: The convex block (41) comprises an annular portion coaxial with the worm wheel (4) and a protruding portion integrally arranged on one side of the annular portion, the connection between the protruding portion and the annular portion is smoothly transitioned, and the end of the protruding portion away from the annular portion is in an arc shape.

5. The cutter fixing mechanism according to claim 1, characterized in that: The shifting boss (42) is a circular column or a pin, and the axis of the circular column or the pin is not colinear with the axis of the worm wheel (4).

6. The cutter fixing mechanism according to claim 1, characterized in that: The pressing plate (7) is connected to the plastic lower shell (6) by screws. The pressing plate (7) is an elastic metal part. The elastic metal part presses the bracket (8) downward. The lower side of the bracket (8) is provided with a downwardly protruding guide column (82); the upper side surface of the plastic lower shell (6) is provided with a guide groove (62) extending in the front-to-back direction, and the end of the guide column (82) extends into the guide groove (62).

7. The cutter fixing mechanism according to claim 1, characterized in that: The pressing sheet (7) is connected to a grounding terminal (71), the pressing sheet (7) is in contact with the bracket (8), the bracket (8) is in contact with the blade (9), the blade (9), the bracket (8) and the pressing sheet (7) are all made of conductive materials, and the grounding terminal (71) conducts static electricity of the blade (9) through a grounding wire.

8. The cutter fixing mechanism according to claim 1, characterized in that: The blade (9) is fixedly connected to the bracket (8).

9. The cutter fixing mechanism according to claim 1, characterized in that: The plastic upper shell (1) and the plastic lower shell (6) are fixed by screws.

Images