Thermal Printer

Abstract

The invention discloses a thermal printer, comprising a paper cutting mechanism (17), wherein the paper cutting mechanism (17) comprises a mounting frame (1), a motor (2) and a paper cutting transmission assembly (3), wherein the motor (2) and the paper cutting transmission assembly (3) are both mounted on the mounting frame (1); the output shaft of the motor (2) is connected to one end of the paper cutting transmission assembly (3), and the thermal printer further comprises a slewing mechanism capable of enabling the paper cutting transmission assembly (3) to slew rapidly, wherein the slewing mechanism is mounted on the mounting frame (1) and connected to the other end of the paper cutting transmission assembly (3). The thermal printer saves time and effort when manually retracting the paper.

Description

Technical Field

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

[0002] like Figure 1 As shown, the thermal printer of the prior art includes a housing 101 and a paper cutting mechanism 102, and the paper cutting mechanism is arranged in the housing. The paper cutting mechanism includes a mounting frame, a motor, a worm, a turbine and a rotary gear. The motor is mounted on the mounting frame, the turbine is meshed with the worm, and the turbine is rotatably connected to the mounting frame. A window 103 capable of shifting the rotary gear is provided on the mounting frame; one end of the worm is connected to the output shaft of the motor, and the other end of the worm is connected to the shifting gear. When the thermal printer is working, paper jams may occur, causing the motor to stop rotating. When this happens, it is necessary to turn off the power supply, open the rear cover 104, and manually shift the rotary gear through the window 103 to manually retract the paper cutter. However, since the transmission of the worm gear is relatively small, the number of rotations of the rotary gear required is relatively large, which makes manual retraction of the paper cutter relatively time-consuming and laborious.

[0003] In summary, there is an urgent need for a thermal printer that can manually retract the knife, saving time and effort, to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a thermal printer which can save time and effort by manually retracting the knife.

[0005] The technical solution of the present invention is to provide a thermal printer, including a paper cutting mechanism, wherein the paper cutting mechanism includes a mounting frame, a motor and a paper cutting transmission assembly, wherein the motor and the paper cutting transmission assembly are both mounted on the mounting frame; the output shaft of the motor is connected to one end of the paper cutting transmission assembly, and the thermal printer further includes a rotating mechanism capable of quickly rotating the paper cutting transmission assembly, wherein the rotating mechanism is mounted on the mounting frame, and the rotating mechanism is connected to the other end of the paper cutting transmission assembly.

[0006] The rotating mechanism includes a fixed seat, a rotating shaft, a meshing component with a meshing state and a disengaged state, a hand-pull component that can make the meshing component quickly enter the meshing state and drive the rotating shaft to rotate, and a reset component that can make the meshing component enter the disengaged state and drive the rotating shaft to rotate; one end of the meshing component is connected to the other end of the paper cutting transmission component, and the other end of the meshing component is connected to one end of the rotating shaft; one end of the hand-pull component is connected to the other end of the rotating shaft; one end of the reset component is connected to the other end of the hand-pull component, and the other end of the reset component is connected to the fixed seat.

[0007] The engagement assembly comprises a first assembly and a second assembly that are fixed in at least one rotational direction, and the first assembly is axially slidable relative to the second assembly.

[0008] The first component includes a first base and at least one first mating tooth, and the first mating tooth is fixed on the first base; the second component includes a second base and at least one second mating tooth, and the second mating tooth is fixed on the second base; the first base and the second base are slidably matched; the first mating tooth and the second mating tooth can be tightly matched.

[0009] The first mating tooth and the second mating tooth can be tightly fitted together, which means that: the first mating tooth includes a first plane and a first inclined surface arranged along the axial direction, the second mating tooth includes a second plane and a second inclined surface arranged along the axial direction, the first plane is basically parallel to the second plane, and the first inclined surface is basically parallel to the second inclined surface.

[0010] There are multiple first mating teeth and multiple second mating teeth, and the multiple first mating teeth and multiple second mating teeth are respectively arranged in a circle and are evenly arranged.

[0011] The hand-pulling assembly includes a sleeve, a columnar member, a spiral groove axially arranged on a rotating shaft, and a driving member that passes through a mounting frame and enables the sleeve to rotate multiple times, wherein the driving member is connected to the sleeve; a space is provided inside the sleeve for the axial sliding of the rotating shaft; the sleeve is sleeved outside the rotating shaft; one end of the columnar member is connected to the sleeve, and the other end of the columnar member slides in the spiral groove.

[0012] The driving member includes a hand-pull member and a connecting rope. The mounting frame is provided with a through hole. Most of the connecting rope is wrapped around the outer surface of the sleeve. One end of the connecting rope is connected to the sleeve. The other end of the connecting rope passes through the through hole and is connected to the hand-pull member.

[0013] Both ends of the sleeve are provided with annular edges for preventing the connecting rope from escaping from the sleeve.

[0014] The reset assembly includes a reset elastic member and a reset shaft, one end of the reset shaft is arranged in the sleeve, and the other end of the reset shaft is connected to the fixed seat; a movable end of the reset elastic member is connected to the fixed seat, and the other movable end of the reset elastic member is connected to the sleeve.

[0015] After adopting the above structure, the present invention has the following advantages compared with the prior art:

[0016] The present invention can realize rapid rotation of the paper cutting transmission mechanism through the rotating mechanism, thereby driving the paper cutter to retreat quickly. Compared with the previous knife retreat structure, the hand pull component only needs to be pulled once to retreat the paper cutter, so manual knife retreat is very time-saving and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded view of a prior art thermal printer.

[0018] Figure 2 It is a structural diagram of a thermal printer of the present invention.

[0019] Figure 3 It is an exploded structural diagram of the thermal printer of the present invention.

[0020] Figure 4 It is an exploded view of the paper cutting mechanism in the first position.

[0021] Figure 5 It is an exploded view of the paper cutting mechanism in the second position.

[0022] Figure 6 It is an exploded view of the paper cutting mechanism in the first position (without the mounting bracket, blade and blade guide plate).

[0023] Figure 7 It is an exploded view of the paper cutting mechanism in the second position (without the mounting bracket, blade and blade guide plate).

[0024] Figure 8 It is an exploded view of the structure of the paper cutting structure.

[0025] Fig. 9 It is a partial cross-sectional view of the meshing components.

[0026] Fig.10 It is a partial sectional exploded view of the meshing assembly in the first orientation.

[0027] Fig.11 It is a partial sectional exploded view of the second orientation of the meshing assembly.

[0028] As shown in the figure: 1. mounting frame, 2. motor, 3. paper cutting transmission assembly, 4. fixing seat, 5. rotating shaft, 6. first assembly, 6.1. first base, 6.2. first matching tooth, 6.21. first plane, 6.22. first inclined surface, 7. second assembly, 7.1. second base, 7.2. second matching tooth, 7.21. second plane, 7.22. second inclined surface, 8. sleeve, 9. columnar member, 10. spiral groove, 11. hand Pull piece, 12, connecting rope, 13, through hole, 14, annular edge, 15, reset elastic piece, 16, reset shaft, 17, paper cutting mechanism, 18, shell, 19, back cover, 20, turbine, 21, worm, 22, blade, 23, blade guide plate, 24, shaft, 25, vertical column, 26, first groove, 27, guide block, 28, guide groove, 29, connecting column, 30, guide column, 31, guide hole, 32, annular piece. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figure 2 , Figure 3 As shown, a thermal printer of the present invention includes a paper cutting mechanism 17, which is arranged in a housing 18 of the thermal printer. The paper cutting mechanism 17 can be seen by opening a rear cover 19 of the housing 18. The improved structure of the present invention is the paper cutting structure, so only the paper cutting structure 17 is described, and other structures such as the thermal printing mechanism are not described in detail.

[0031] like Figure 4 , Figure 5 As shown, the paper cutting mechanism comprises a mounting frame 1, a motor 2 and a paper cutting transmission assembly 3, wherein the motor 2 and the paper cutting transmission assembly 3 are both mounted on the mounting frame 1, and the motor 2 is fixedly connected by screws. In this embodiment, the paper cutting transmission assembly 3 comprises a turbine 20, a worm 21, a blade 22 and a blade guide plate 23, wherein the worm 21 is meshed with the turbine 20; the turbine 20 is rotatably connected to the mounting frame 1 through a shaft 24; the output shaft of the motor 2 is connected to one end of the paper cutting transmission assembly 3, that is, the output shaft of the motor 2 is connected to one end of the worm 21; a vertical column 25 is provided on the turbine 20, a first groove 26 for the vertical column 25 to slide is provided on the blade 22, and two guide blocks 27 are also provided on the blade 22, and the two guide blocks 27 are defined by two guide grooves 28 of the blade guide plate 23, and the same position of the two guide grooves is connected perpendicular to the line along the length direction of the first groove 26, and the blade guide plate 23 is connected to the mounting frame to define the position of the blade 22.

[0032] The thermal printer further comprises a rotating mechanism capable of rapidly rotating the paper cutting transmission assembly 3 . The rotating mechanism is mounted on the mounting frame 1 and is connected to the other end of the paper cutting transmission assembly 3 .

[0033] The rotating mechanism includes a fixed seat 4, a rotating shaft 5, a meshing component with a meshing state and a disengaged state, a hand-pull component that can make the meshing component quickly enter the meshing state and drive the rotating shaft 5 to rotate, and a reset component that can make the meshing component enter the disengaged state and drive the rotating shaft 5 to rotate; one end of the meshing component is connected to the other end of the paper cutting transmission component 3, and the other end of the meshing component is connected to one end of the rotating shaft 5; one end of the hand-pull component is connected to the other end of the rotating shaft 5, generally used to drive the rotating shaft 5 to rotate in the opposite direction and drive the first component 6 and the second component 7 to mesh; one end of the reset component is connected to the other end of the hand-pull component, generally used to drive the rotating shaft 5 to rotate forward and drive the first component 6 and the second component 7 to separate; the other end of the reset component is connected to the fixed seat 4.

[0034] like Figure 6 , Figure 7 , Figure 8 As shown, the engagement assembly includes a first assembly 6 and a second assembly 7 that are fixed in at least one rotational direction, and the first assembly 6 is axially slidable relative to the second assembly 7 .

[0035] like Fig. 9 , Fig.10 , Fig.11 As shown, the first component 6 includes a first base 6.1 and at least one first matching tooth 6.2, and the first matching tooth 6.2 is fixed on the first base 6.1; the second component 7 includes a second base 7.1 and at least one second matching tooth 7.2, and the second matching tooth 7.2 is fixed on the second base 7.1; the first base 6.1 and the second base 7.1 are slidably matched; the first matching tooth 6.2 and the second matching tooth 7.2 can be tightly matched. In this embodiment, the cross section of the first matching tooth 6.2 and the cross section of the second matching tooth 7.2 are both roughly right-angled triangles, and the right angle side of the triangle is connected to the first base 6.1 or the second base 7.1, and the other right angle side is in the first plane 6.21 or the second plane 7.21, and the hypotenuse is in the first inclined surface 6.22 or the second inclined surface 7.22.

[0036] The first mating tooth 6.2 and the second mating tooth 7.2 can be tightly matched, which means that: the first mating tooth 6.2 includes a first plane 6.21 and a first inclined surface 6.22 arranged along the axial direction, and the second mating tooth 7.2 includes a second plane 7.21 and a second inclined surface 7.22 arranged along the axial direction, and the first plane 6.21 is substantially parallel to the second plane 7.21 and the first inclined surface 6.22 is substantially parallel to the second inclined surface 7.22, that is, the first plane 6.21 is meshed with the second plane 7.21 or the first inclined surface 6.22 and the second inclined surface 7.22 slide against each other.

[0037] The first mating teeth 6.2 and the second mating teeth 7.2 are both multiple, and the multiple first mating teeth 6.2 and the multiple second mating teeth 7.2 are respectively arranged in a circle and evenly arranged. In this embodiment, the multiple first mating teeth 6.2 are arranged along the edge of the first base 6.1, and the outer and inner surfaces of the multiple first mating teeth 6.2 are both circular. The multiple second mating teeth 7.2 are arranged along the edge of the second base 7.1, and the outer and inner surfaces of the multiple first mating teeth 7.2 are both circular. The sliding fit between the first base 6.1 and the second base 7.1 means that: the first base 6.1 is provided with a guide column 30, and the second base 7.2 is provided with a guide hole 31 that matches the size and shape of the guide column 30, and the guide column 30 is slidably fitted in the guide hole 31.

[0038] The second base 7.1 is provided with an annular member 32, the inner ring shape of the annular member 32 matches the size and shape of the outer circular surface of the first base 6.1, and the first base 6.1 is slidably fitted in the annular member 32.

[0039] like Figure 6 , Figure 7 , Figure 8 As shown, the hand-pull assembly includes a sleeve 8, a columnar member 9, a spiral groove 10 axially arranged on the rotating shaft 5, and a driving member that passes through the mounting frame 1 and can make the sleeve 8 rotate multiple times, and the driving member is connected to the sleeve 8; the sleeve 8 is sleeved outside the rotating shaft 5, and a space for the rotating shaft 5 to slide axially is provided in the sleeve 8; one end of the columnar member 9 is connected to the sleeve 8, which can be screwed or embedded; the other end of the columnar member 9 slides in the spiral groove 10. The spiral groove 10 is a positive spiral structure, that is, the spiral is rotated to the right, that is, the spiral structure can drive the rotating shaft forward to mesh the first component 6 and the second component 7, or it can be a reverse spiral structure, which is determined by the rotation direction of the motor 2. The spiral groove 10 runs through the axial direction of the rotating shaft 5, or it may not run through, as long as the tool can be retracted.

[0040] The driving member includes a hand-pull member 11 and a connecting rope 12. A through hole 13 is provided on the mounting frame 1. Most of the connecting rope 12 is wrapped around the outer surface of the sleeve 8; one end of the connecting rope 12 is connected to the sleeve 8; the other end of the connecting rope 12 passes through the through hole 13 and is connected to the hand-pull member 11. In this embodiment, the hand-pull member 11 cannot pass through the through hole 13, forming a limit.

[0041] Both ends of the sleeve 8 are provided with an annular edge 14 for preventing the connecting rope 12 from slipping out of the sleeve 8 .

[0042] The reset assembly includes a reset elastic member 15 and a reset shaft 16. The reset elastic member 15 can be a torsion spring or a coil spring. One end of the reset shaft 16 is arranged in the sleeve 8, that is, one end of the reset shaft 16 and one end of the rotating shaft 5 are both arranged in the sleeve 8. The other end of the reset shaft 16 is connected to the fixed seat 4. One movable end of the reset elastic member 15 is connected to the fixed seat 4 through a connecting column 29, and the other movable end of the reset elastic member 15 is connected to the sleeve 8 through a connecting column 29.

[0043] The working principle of the present invention is: when the thermal printer is working normally, the motor 2 drives the worm 20 to rotate, the worm 20 drives the turbine 21 to rotate, the turbine 21 limits the blade 22 through the two guide grooves 28 of the vertical column 25 and the blade guide plate 23 and drives the blade to move back and forth, cutting the printing paper when moving forward. At this time, since the first component 6 and the second component 7 are in a separated state, the first component 6 rotates with the worm 20, and the second component 7 is in a stationary state.

[0044] When the thermal printer is jammed, the worm 20 is stuck in the forward rotation. First, turn off the power, then manually pull the handle 11. Driven by the connecting rope 12, the sleeve 8 and the columnar member 9 rotate in the opposite direction. The columnar member 9 slides in the spiral groove 10, and then drives the rotating shaft 5 to rotate and slide axially, so that the first component 7 and the second component 6 fit tightly and drive the second component 6 to rotate, so that the worm 20 and the turbine 21 connected to the second component 6 rotate in the opposite direction, and the knife plate 22 is retracted. The retraction position is determined by the length of the connecting rope 12. (The length of the connection line 12 is determined according to the distance the tool needs to be retracted after the paper jam. After retraction, the tool is in the initial position and the rear cover 19 can be opened normally.) While the sleeve 8 rotates, the reset elastic member 15 accumulates energy driven by the sleeve 8.

[0045] When the blade 22 is retracted to its proper position, the jammed paper is removed, and then the hand-pull member 11 is loosened. At this time, under the action of the reset elastic member 15, the sleeve 8 rotates and drives the pulled rope 12 to wind, until the hand-pull member 11 is limited to the through hole 13 on the mounting frame 1, and the reset is completed. At the same time, the rotation of the sleeve 8 also drives the columnar member 9 to slide in the reverse direction in the spiral groove 10, and then drives the rotating shaft 5 to rotate and slide axially, so that the first component 7 is separated from the second component 6.

[0046] The above description is only for the best embodiment of the present invention, which should not be understood as limiting the claims. All changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. A thermal printer, comprising a paper cutting mechanism (17), wherein the paper cutting mechanism (17) comprises a mounting frame (1), a motor (2) and a paper cutting transmission assembly (3), wherein the motor (2) and the paper cutting transmission assembly (3) are both mounted on the mounting frame (1); an output shaft of the motor (2) is connected to one end of the paper cutting transmission assembly (3), and is characterized in that: The thermal printer further comprises a rotating mechanism capable of causing the paper cutting transmission assembly (3) to rotate rapidly, the rotating mechanism being mounted on the mounting frame (1) and connected to the other end of the paper cutting transmission assembly (3); The rotary mechanism comprises a fixed seat (4), a rotary shaft (5), a meshing component having a meshing state and a disengaged state, a hand-pull component capable of enabling the meshing component to quickly enter a meshing state and drive the rotary shaft (5) to rotate, and a reset component capable of enabling the meshing component to enter a disengaged state and drive the rotary shaft (5) to rotate; one end of the meshing component is connected to the other end of the paper cutting transmission component (3), and the other end of the meshing component is connected to one end of the rotary shaft (5); one end of the hand-pull component is connected to the other end of the rotary shaft (5); one end of the reset component is connected to the other end of the hand-pull component, and the other end of the reset component is connected to the fixed seat (4); The meshing assembly comprises a first assembly (6) and a second assembly (7) which are fixed in at least one rotational direction, and the first assembly (6) is axially slidable relative to the second assembly (7); The first component (6) comprises a first base (6.1) and at least one first matching tooth (6.2), wherein the first matching tooth (6.2) is fixed on the first base (6.1); the second component (7) comprises a second base (7.1) and at least one second matching tooth (7.2), wherein the second matching tooth (7.2) is fixed on the second base (7.1); the first base (6.1) and the second base (7.1) are slidably matched; the first matching tooth (6.2) and the second matching tooth (7.2) can be tightly matched; The hand-pulling assembly comprises a sleeve (8), a columnar member (9), a spiral groove (10) axially arranged on the rotating shaft (5), and a driving member that passes through the mounting frame (1) and can enable the sleeve (8) to rotate multiple times, wherein the driving member is connected to the sleeve (8); a space is provided inside the sleeve (8) for the axial sliding of the rotating shaft (5); the sleeve (8) is sleeved outside the rotating shaft (5); one end of the columnar member (9) is connected to the sleeve (8), and the other end of the columnar member (9) slides in the spiral groove (10).

2. The thermal printer according to claim 1, characterized in that: The first mating tooth (6.2) and the second mating tooth (7.2) can be tightly matched, which means that: the first mating tooth (6.2) comprises a first plane (6.21) and a first inclined surface (6.22) arranged along the axial direction, the second mating tooth (7.2) comprises a second plane (7.21) and a second inclined surface (7.22) arranged along the axial direction, the first plane (6.21) is substantially parallel to the second plane (7.21), and the first inclined surface (6.22) is substantially parallel to the second inclined surface (7.22).

3. The thermal printer according to claim 2, characterized in that: There are multiple first matching teeth (6.2) and multiple second matching teeth (7.2), and the multiple first matching teeth (6.2) and multiple second matching teeth (7.2) respectively form a circle and are evenly arranged.

4. The thermal printer according to claim 1, characterized in that: The driving member comprises a hand-pull member (11) and a connecting rope (12); a through hole (13) is provided on the mounting frame (1); most of the connecting rope (12) is wound around the outer surface of the sleeve (8); one end of the connecting rope (12) is connected to the sleeve (8); the other end of the connecting rope (12) passes through the through hole (13) and is connected to the hand-pull member (11).

5. The thermal printer according to claim 3, characterized in that: Both ends of the sleeve (8) are provided with an annular edge (14) for preventing the connecting rope (12) from slipping out of the sleeve (8).

6. The thermal printer according to claim 1, characterized in that: The reset assembly comprises a reset elastic member (15) and a reset shaft (16); one end of the reset shaft (16) is arranged in the sleeve (8), and the other end of the reset shaft (16) is connected to the fixed seat (4); one movable end of the reset elastic member (15) is connected to the fixed seat (4), and the other movable end of the reset elastic member (15) is connected to the sleeve (8).

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