Automatic resetting structure of movable blade

Abstract

The utility model discloses an automatic reset structure of a movable blade. The automatic reset structure comprises a transmission shaft, a first gear, a second gear, a wrench, a third gear and a first reset spring, the first gear is slidably mounted at the first end of the transmission shaft and transmits torque to the transmission shaft through a flat table structure. The second gear is fixedly mounted at the second end of the transmission shaft. The middle section of the wrench is rotatably mounted on a first pivot shaft parallel to the transmission shaft, one end of the wrench is provided with a shifting structure used for separating the first gear from the flat table structure and the first rack, the third gear is rotatably mounted on a second pivot shaft parallel to the transmission shaft, and the third gear is meshed with the second gear. The first reset spring is used for providing reset force for the third gear. The wrench is wrenched, the first gear and the first rack are not engaged any more, at the moment, the first rack is not affected by the self-locking force of the motor, and under the action of the first reset spring, the third gear drives the second rack to rotate, so that the movable blade automatically returns to the initial position.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal printers, in particular to an automatic resetting structure for a movable blade. Background Art

[0002] The thermal printer's movement module is equipped with a cutter. The cutter consists of a moving blade, a moving blade mounting part, a moving blade driving part, a fixed blade, and a fixed blade mounting frame. When printing is completed, the moving blade is driven by the moving blade driving part to extend and shear with the fixed blade, thereby cutting the paper; after cutting the paper, the moving blade returns to the initial position and waits for the next paper cutting command.

[0003] In actual use, the moving blade and the fixed blade may occasionally get stuck. At this time, the movement needs to be opened to allow the moving blade to automatically reset. Since the moving blade drive unit is driven by a motor-driven gear transmission, the motor itself has a certain self-locking force, and the meshing transmission gear needs to be separated to achieve the automatic reset of the moving blade when the motor does not rotate. How to separate the gears is a difficulty of this type of movement. Utility Model Content

[0004] To this end, the utility model provides a movable blade automatic resetting structure to solve one or more of the above-mentioned problems.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A structure for automatically resetting a moving blade, comprising a transmission shaft, a first gear, a second gear, a wrench, a third gear and a first reset spring; the first gear is slidably mounted on the first end of the transmission shaft and transmits torque to the transmission shaft through a flat table structure, and when the first gear is combined with the flat table structure, the first gear meshes with the first rack of the moving blade mounting portion; the second gear is fixedly mounted on the second end of the transmission shaft and meshes with the second rack of the moving blade mounting portion; the middle section of the wrench is rotatably mounted on a first pivot shaft parallel to the transmission shaft, and one end of the wrench is provided with a toggle structure for disengaging the first gear from the flat table structure and the first rack, the third gear is rotatably mounted on a second pivot shaft parallel to the transmission shaft, the third gear meshes with the second gear, and the first reset spring is used to provide a reset force to the third gear.

[0007] Furthermore, the movable blade automatic reset structure further comprises a second reset spring, and the second reset spring is used for applying a reset pressure to the first gear to compress the flat table structure.

[0008] Furthermore, the flat table structure includes a circular table fixedly arranged on the transmission shaft, a groove or a boss is arranged on the side of the circular table facing the first gear, and a boss or a groove corresponding to the groove or the boss is arranged on the side of the first gear facing the circular table.

[0009] Furthermore, a middle section of the wrench is provided with a first penetration hole for penetrating the first pivot axis.

[0010] Furthermore, the toggle structure includes an inclined guide surface, and when the wrench is pulled to extend between the truncated table and the first gear, the guide surface squeezes the first gear to move the first gear away from the truncated table.

[0011] Furthermore, the first return spring is a torsion spring.

[0012] Furthermore, the second return spring is a compression spring.

[0013] The utility model has the following advantages:

[0014] When unblocking, pull the wrench and the toggle structure to move the first gear along the rotating axis to the side away from the flat table structure, so that the first gear and the first rack are no longer meshed. At this time, the first rack and the moving blade mounting part and the moving blade are not affected by the self-locking force of the motor. Under the action of the first reset spring, the third gear drives the second gear to rotate, the second gear drives the second rack to rotate, and the second gear drives the moving blade mounting part to move, so that the moving blade and the moving blade mounting part automatically return to the initial position.

[0015] The above summary is for illustrative purposes only 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 accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0018] Figure 1 A schematic diagram of the structure of a movement module using an automatic resetting structure for a movable blade provided in an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of a structure of an automatic resetting structure for a movable blade provided by an embodiment of the utility model;

[0020] Figure 3 A schematic diagram of the structure of the automatic resetting structure of the movable blade provided by the embodiment of the utility model applied to one side of the movement module;

[0021] Figure 4 A schematic diagram of the structure of the other side of the movement module in which the automatic resetting structure of the movable blade provided by the embodiment of the utility model is applied;

[0022] Figure 5 A schematic diagram of the positional relationship of a transmission shaft, a first gear, a second gear and a second reset spring of an automatic reset structure for a movable blade provided by an embodiment of the utility model;

[0023] Figure 6 A schematic diagram of the structure of a transmission wrench with an automatic resetting structure for a movable blade provided by an embodiment of the utility model;

[0024] Figure 7 A schematic diagram of a wrench of a movable blade automatic resetting structure provided in an embodiment of the utility model forcing a first gear to move to a side away from a truncated table.

[0025] In the figure: 1-moving blade, 2-moving blade mounting portion, 3-moving blade driving portion, 4-fixed blade, 5-fixed blade mounting frame, 6-first rack, 7-second rack, 8-transmission shaft, 9-first gear, 10-flat table structure, 11-second gear, 12-wrench, 13-sliding structure, 14-third gear, 15-first return spring, 16-second return spring, 17-round table, 18-groove, 19-boss, 20-guide surface. DETAILED DESCRIPTION

[0026] 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 illustrative and non-restrictive in nature.

[0027] like Figure 1-7 As shown, this embodiment provides a movable blade automatic resetting structure, which is applied to the cutter of the core module of a thermal printer. It is an improvement on the existing structure, and the key point is how to release the self-locking of the motor.

[0028] In the prior art, the cutter is composed of a moving blade 1, a moving blade mounting portion 2, a moving blade driving portion 3, a fixed blade 4, a fixed blade mounting frame 5, etc. The moving blade 1 is mounted on the moving blade mounting portion 2, and a rack is arranged on the lower side of the moving blade mounting portion 2. The moving blade driving portion 3 is a set of gear sets, the input end of which is connected to the motor, and the output end is meshed with the rack. In this embodiment, two racks are arranged on the lower side of the moving blade mounting portion 2, namely a first rack 6 and a second rack 7. The two racks are arranged in the front-to-back direction, and the two racks are spaced apart on the lower side of the moving blade mounting portion 2, one on the left and one on the right. In this embodiment, the four directions of front, back, left, and right are defined by "the direction in which the moving blade 1 approaches the fixed blade 4" as "front".

[0029] A transmission shaft 8 is arranged below the movable blade mounting portion 2. The transmission shaft 8 is immovable relative to the printer frame (or, relative to the fixed blade 4 and the fixed blade 4 mounting portion), but can rotate along its own axis. The transmission shaft 8 is arranged in the left and right directions. A first gear 9 is slidably mounted on the first end of the transmission shaft 8. The first gear 9 and the transmission shaft 8 transmit torque through the flat table structure 10. When the first gear 9 is combined with the flat table structure 10, the first gear 9 and the transmission shaft 8 can only rotate synchronously, and the first gear 9 at this time is meshed with the first rack 6; when the first gear 9 slides along the axis and disengages from the flat table structure 10, the first gear 9 and the transmission shaft 8 can rotate relative to each other; after the first gear 9 is away from the flat table structure 10 by a certain distance, the first gear 9 and the first rack 6 are no longer meshed. A second gear 11 is fixedly mounted on the second end of the transmission shaft 8, and the second gear 11 is meshed with the second rack 7. It should be noted that the first end and the second end of the transmission shaft 8 refer to shaft segments with a certain length, and the first end and the second end are a section of the shaft at two ends in opposite directions.

[0030] The middle section of the wrench 12 is rotatably mounted on a first pivot axis parallel to the transmission shaft 8, and the first pivot axis can be set on the frame of the printer. Exemplarily, the middle section of the wrench 12 is provided with a first through hole for penetrating the first pivot axis, and the wrench 12 is rotatably mounted on the first pivot axis through the first through hole. The inner end of the wrench 12 extends into the printer and is located below the flat table structure 10 and the first gear 9. The end is provided with a toggle structure 13 for disengaging the first gear 9 from the flat table structure 10 and the first rack 6. When pressure is applied to the outer end of the wrench 12 (the end outside the printer), the wrench 12 rotates (sways) around the first pivot axis by a certain angle, and the toggle structure 13 at the inner end will force the first gear 9 to move toward the side away from the flat table structure 10, so that the torque is no longer transmitted between the first gear 9 and the transmission shaft 8, and the first gear 9 is disengaged from the first rack 6.

[0031] The third gear 14 is rotatably mounted on a second pivot shaft parallel to the transmission shaft 8, and the first pivot shaft can be set on the frame of the printer. The third gear 14 is meshed with the second gear 11, and the first return spring 15 acts on the frame (the second pivot shaft is regarded as a fixed part, so the frame here includes the second pivot shaft) and the third gear 14 to provide a return force to the third gear 14. Driven by the motor, during the movement of the movable blade 1 toward the fixed blade 4, the first return spring 15 will store energy, and after the first gear 9 is disengaged from the first rack 6, the first return spring 15 will release energy; it should be noted that the energy storage of the first return spring 15 is not only in the above process, but also can be installed during installation (for example, pre-compression installation of compression springs, pre-torsion installation of torsion springs). Exemplarily, the first return spring 15 is a torsion spring.

[0032] The automatic reset structure of the moving blade of this embodiment first releases the self-locking of the motor, and then uses the reset force to automatically reset the moving blade. Specifically, when unblocking, the wrench 12 is pulled, and the toggle structure 13 moves the first gear 9 along the rotation axis away from the flat table structure 10, so that the first gear 9 and the first rack 6 are no longer meshed. At this time, the first rack 6 and the moving blade mounting part 2 and the moving blade 1 are not affected by the self-locking force of the motor. Under the action of the first reset spring 15, the third gear 14 drives the second gear 11 to rotate, the second gear 11 drives the second rack 7 to rotate, and the second rack 7 drives the moving blade mounting part 2 to move, so that the moving blade 1 and the moving blade mounting part 2 automatically return to the initial position.

[0033] In this embodiment, the movable blade automatic reset structure further includes a second reset spring 16, which is used to apply reset pressure to the first gear 9 to press the flat table structure 10. Exemplarily, the second reset spring 16 is sleeved on the transmission shaft 8, with one end abutting against the first gear 9 and the other end abutting against the frame (including the housing) of the printer. Exemplarily, the second reset spring 16 is a compression spring.

[0034] The flat table structure 10 for transmitting torque belongs to the prior art. For example, the flat table structure 10 includes a truncated table 17 fixedly arranged on the transmission shaft 8, a groove 18 or a boss 19 is arranged on the side of the truncated table 17 facing the first gear 9, and a boss 19 or a groove 18 corresponding to the groove 18 or the boss 19 is arranged on the side of the first gear 9 facing the truncated table 17. When the first gear 9 abuts against the truncated table 17, the corresponding grooves 18 or bosses 19 are engaged with each other, so that the first gear 9 and the transmission shaft 8 can rotate synchronously; when the first gear 9 is away from the truncated table 17 for a certain distance, the engaged grooves 18 and bosses 19 are disengaged, and at this time, the torque is no longer transmitted between the first gear 9 and the transmission shaft 8.

[0035] The toggle structure 13 for moving the first gear 9 away from the round table 17 has various forms, and this embodiment only exemplifies one of them. The toggle structure 13 includes an inclined guide surface 20. When the inner end of the toggle wrench 12 extends between the round table 17 and the first gear 9, the first gear 9 is forced away from the round table 17 under the action of the guide surface 20.

[0036] 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.

[0037] 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.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0041] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A movable blade automatic resetting structure, characterized in that: It includes a transmission shaft, a first gear, a second gear, a wrench, a third gear and a first return spring; the first gear is slidably mounted on the first end of the transmission shaft and transmits torque to the transmission shaft through a flat table structure, and when the first gear is combined with the flat table structure, the first gear is meshed with the first rack of the moving blade mounting part; the second gear is fixedly mounted on the second end of the transmission shaft and is meshed with the second rack of the moving blade mounting part; the middle section of the wrench is rotatably mounted on a first pivot shaft parallel to the transmission shaft, and one end of the wrench is provided with a toggle structure for disengaging the first gear from the flat table structure and the first rack, the third gear is rotatably mounted on a second pivot shaft parallel to the transmission shaft, the third gear is meshed with the second gear, and the first return spring is used to provide a return force to the third gear.

2. The automatic resetting structure of the movable blade according to claim 1, characterized in that: The movable blade automatic reset structure further comprises a second reset spring, and the second reset spring is used for applying a reset pressure to the first gear to compress the flat table structure.

3. The automatic resetting structure of the movable blade according to claim 1, characterized in that: The flat table structure includes a circular table fixedly arranged on the transmission shaft, a groove or a boss is arranged on the side of the circular table facing the first gear, and a boss or a groove corresponding to the groove or the boss is arranged on the side of the first gear facing the circular table.

4. The automatic resetting structure of the movable blade according to claim 1, characterized in that: The middle section of the wrench is provided with a first penetration hole for penetrating the first pivot axis.

5. The automatic resetting structure of the movable blade according to claim 3, characterized in that: The toggle structure includes an inclined guide surface. When the wrench is pulled to extend between the round table and the first gear, the guide surface squeezes the first gear to make the first gear move away from the round table.

6. The automatic resetting structure of the movable blade according to claim 1, characterized in that: The first return spring is a torsion spring.

7. The automatic resetting structure of the movable blade according to claim 2, characterized in that: The second return spring is a compression spring.

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