Screwing-free cover opening and closing structure

Abstract

The utility model discloses a screw-free cover opening and closing structure, which comprises a positioning plate, a microswitch and a pressing device, and is characterized in that the positioning plate is made of a plastic material and is provided with a clearance groove and a positioning column; the microswitch comprises a switch body, a wiring terminal and a movable guide rod, the switch body is provided with a positioning rod and a positioning hole, the positioning rod can be clamped in the receding groove, the positioning column is clamped in the positioning hole, the wiring terminal is inserted in the switch body, and the movable guide rod rotates with the switch body as the center; the pressing device is used for connecting the upper cover and the lower cover, the lower cover is provided with a trigger rib, the pressing device can abut against the movable guide rod so that the trigger rib can interfere with rotating movement of the movable guide rod, the positioning plate is pushed away through external force during installation so that the microswitch can be installed in a downward pressing mode, and the positioning plate automatically rebounds and resets according to plastic characteristics after installation. A screw-free fixing mode is achieved, the installation requirement for narrow space is met, the effects of saving materials and being convenient to disassemble and assemble can be achieved, and economic benefits are brought to producers.

Description

Technical Field

[0001] The utility model belongs to the technical field of printers, and particularly relates to an opening and closing cover structure without screws. Background Art

[0002] Thermal printers have the advantages of fast speed, low noise, clear printing, and easy use. They are widely used in POS terminal systems, banking systems, medical instruments and other fields. In order to detect whether the upper and lower covers are completely closed, most thermal printers in the prior art use micro switches for detection. The micro switches in the prior art are generally fixed to the upper cover or the lower cover with screws. Using screws to fix the micro switches will not only make it inconvenient to disassemble and assemble the printer, complicate the disassembly and assembly process, but also increase the cost of using screws. More importantly, it cannot meet the installation requirements of narrow spaces where screws cannot be driven. This leads to high disassembly and assembly efficiency and production costs of the upper and lower cover connection structure in this way, increases screw materials, and reduces economic benefits. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide an opening and closing cover structure that does not require screws, which can not only meet the installation requirements of narrow spaces, but also save the process of installing screws, save screw materials, improve disassembly and assembly efficiency, and bring economic benefits to producers.

[0004] In order to solve the above problems, the technical solution adopted by the utility model is as follows: a screw-free opening and closing cover structure, comprising:

[0005] A positioning plate, the positioning plate is made of plastic material and is provided with a space-avoiding groove and a positioning column;

[0006] A micro switch, the micro switch comprising a switch body, a wiring terminal and a movable guide rod, the switch body is provided with a positioning rod and a positioning hole, the positioning rod can be clamped in the air avoidance groove, the positioning column is clamped in the positioning hole, the wiring terminal is plugged into the switch body, and the movable guide rod rotates around the switch body; and

[0007] A pressing device is used to connect the upper cover and the lower cover. The lower cover is provided with a trigger rib. The pressing device can press against the movable guide rod so that the trigger rib interferes with the rotational movement of the movable guide rod.

[0008] Compared with the prior art, the beneficial effect of the utility model is that a positioning plate made of plastic material is provided on the upper cover. When installing the micro switch, you only need to push the positioning plate open with external force, and then clamp the positioning rod of the micro switch into the air avoidance groove for pressing down installation. After installation in place, the positioning plate automatically rebounds and resets according to the characteristics of plastic, and the positioning column on the positioning plate clamps the positioning hole of the micro switch to fix it, completing the assembly of the micro switch, and then assemble it with the lower outer cover. This installation can realize a screw-free fixing method, which can not only meet the installation requirements of narrow space but also save materials and facilitate disassembly and assembly, bringing economic benefits to producers.

[0009] In the above-mentioned opening and closing cover structure, the positioning plate and the upper cover are integrally injection-molded.

[0010] In the above-mentioned opening and closing cover structure, the pressing device is a hook.

[0011] In the above-mentioned opening and closing cover structure, a key opening is provided at one end of the upper cover, and a key on a key switch can pass through the key opening so that the key switch is connected to the upper cover.

[0012] In the above-mentioned opening and closing cover structure, the wiring terminals are made of hardware sheets.

[0013] In the above-mentioned opening and closing cover structure, a reset spring is arranged inside the micro switch, and the movable guide rod can be automatically reset.

[0014] In the above-mentioned opening and closing cover structure, when the upper cover and the lower cover are closed, the hook presses the movable guide rod so that the trigger rib interferes with the rotational movement of the movable guide rod.

[0015] In the above-mentioned opening and closing cover structure, when the upper cover and the lower cover are opened, the trigger rib does not interfere with the automatic reset of the movable guide rod.

[0016] In the above-mentioned opening and closing cover structure, the number of the positioning plates is not less than two. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The internal structure of the upper cover of the utility model embodiment is shown in FIG. Figure 1 ;

[0018] Figure 2 The internal structure of the upper cover of the utility model embodiment is shown in FIG. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the micro switch structure of an embodiment of the utility model;

[0020] Figure 4 The cross-section diagram of the opening and closing cover structure of the utility model embodiment is shown in FIG. Figure 1 ;

[0021] Figure 5 The cross-section diagram of the opening and closing cover structure of the utility model embodiment is shown in FIG. Figure 2 ;

[0022] Figure 6 An exploded view of the opening and closing structure of an embodiment of the utility model;

[0023] Description of the accompanying drawings: 100 positioning plate, 110 avoidance groove, 120 positioning column, 200 micro switch, 210 switch body, 211 positioning rod, 212 positioning hole, 220 wiring terminal, 230 movable guide rod, 300 pressing device, 400 upper cover, 410 button port, 500 lower cover, 510 trigger rib, 600 button switch, 610 button. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below. Figures 1 to 6 The embodiment of the utility model provides a screw-free opening and closing cover structure, referring to Figure 2 , including a positioning plate 100, a micro switch 200 and a pressing device 300, the positioning plate 100 is made of plastic material, and a clearance groove 110 and a positioning column 120 are provided on the positioning plate 100; Figure 3 The micro switch 200 includes a switch body 210, a terminal 220 and a movable guide rod 230. The switch body 210 is provided with a positioning rod 211 and a positioning hole 212. Figure 1 The positioning rod 211 can be clamped in the avoidance groove 110, the positioning column 120 is clamped in the positioning hole 212, the terminal 220 is plugged into the switch body 210, and the movable guide rod 230 rotates around the switch body 210; the pressing device 300 is used to connect the upper cover 400 and the lower cover 500, and the lower cover 500 is provided with a trigger rib 510, and the pressing device 300 can press against the movable guide rod 230 so that the trigger rib 510 interferes with the rotation and movement of the movable guide rod 230, and the upper cover 400 is provided with a positioning plate 100 made of plastic material. When installing the micro switch 200 , it is only necessary to push the positioning plate 100 open with external force, and then clip the positioning rod 211 of the micro switch 200 into the air avoidance groove 110 for pressing down to install. After installation, the positioning plate 100 automatically rebounds and resets according to the plastic properties, and the positioning column 120 on the positioning plate 100 clips the positioning hole 212 of the micro switch 200 to fix it, completing the assembly of the micro switch 200, and then assemble it with the lower cover 500, realizing a method of fixing the micro switch 200 without screws, which can not only meet the installation requirements of narrow space but also save materials and facilitate disassembly and assembly, bringing economic benefits to manufacturers.

[0025] Furthermore, the positioning plate 100 and the upper cover 400 are integrally injection molded. Furthermore, the present invention does not limit the specific structure of the pressing device 300. Preferably, the pressing device 300 is a hook, such as Figure 4 As shown, the upper cover 400 and the lower cover 500 are connected together by a hook, and the hook rotates to realize the closing and opening of the upper cover 400 and the lower cover 500. The micro switch 200 is fixed inside the upper cover 400. When the upper cover 400 and the lower cover 500 are closed, the hook portion of the hook presses the movable guide rod 230 of the micro switch 200, so that the movable guide rod 230 rotates along the switch body 210 to a position where it cannot rotate, which can also be called a critical position, refer to Figure 5 At this time, the outer end surface of the movable guide rod 230 is in contact with the outer end surface of the trigger rib 510 of the lower cover 500, and the trigger rib 510 interferes with the rotation and displacement of the movable guide rod 230. Further, when the upper cover 400 and the lower cover 500 are closed, the hook presses the movable guide rod 230 so that the trigger rib 510 interferes with the rotation and displacement of the movable guide rod 230. Since the movable guide rod 230 inside the micro switch 200 is electrically connected to the two wiring terminals 220, when the movable guide rod 230 rotates to the critical position, the circuit inside the micro switch 200 is connected. Furthermore, a reset spring is provided inside the micro switch 200, and the movable guide rod 230 can When the upper cover 400 and the lower cover 500 are opened, the trigger rib 510 does not interfere with the automatic reset of the movable guide rod 230. When the upper cover 400 and the lower cover 500 are opened, the pressure of the hook on the movable guide rod 230 is removed. At this time, the movable guide rod 230 has a reverse force under the action of the reset spring, and the movable guide rod 230 rotates in the opposite direction. Therefore, the trigger rib 510 cannot interfere with the rotation reset of the movable guide rod 230, and the circuit in the micro switch 200 is disconnected. Whether the upper cover 400 and the lower cover 500 are closed is detected by whether the line is connected, and the closing status of the upper cover 400 and the lower cover 500 is fed back.

[0026] Furthermore, refer to Figure 6 A key port 410 is provided at one end of the upper cover 400, and a key 610 of the key switch 600 can pass through the key port 410 to connect the key switch 600 with the upper cover 400. The key switch 600 is mechanically connected to the hook. When the upper cover 400 needs to be opened, the key 610 is pressed to rotate the hook. During the process of opening the upper cover 400, the hook pressed on the movable guide rod 230 changes its position and the pressure on the movable guide rod 230 disappears. At this time, the movable guide rod 230 is reversed under the action of the return spring. The movable guide rod 230 rotates in the opposite direction due to the action of force, so the trigger rib 510 cannot interfere with the rotation and reset of the movable guide rod 230, and the circuit in the micro switch 200 is disconnected. Furthermore, the utility model does not limit the material and structure of the terminal block 220. Preferably, the terminal block 220 is made of metal sheet. Of course, the utility model does not limit the number of positioning plates 100. Preferably, in order to better detect the covering condition of the upper cover 400 and the lower cover 500, the number of positioning plates 100 in the utility model is not less than two.

[0027] It should be noted that in the description of the present invention, if there are any orientation descriptions, such as up, down, front, back, left, right, etc., the orientations or positional relationships indicated are all based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and cannot be understood as a limitation on the present invention.

[0028] In the description of the utility model, the meaning of "several" is one or more of a screw-free opening and closing cover structure, the meaning of "more" is two or more, "greater than", "less than", "exceed" and the like are understood as not including the number, and "above", "below", "within" and the like are understood as including the number. If there is a description of the first screw-free opening and closing cover structure or the second, it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A screw-free opening and closing cover structure, characterized in that: include: A positioning plate (100), wherein the positioning plate (100) is made of a plastic material and is provided with a void avoidance groove (110) and a positioning column (120); A micro switch (200), the micro switch (200) comprising a switch body (210), a wiring terminal (220) and a movable guide rod (230), the switch body (210) being provided with a positioning rod (211) and a positioning hole (212), the positioning rod (211) being capable of being clamped in the air avoidance groove (110), the positioning column (120) being clamped in the positioning hole (212), the wiring terminal (220) being plugged into the switch body (210), and the movable guide rod (230) being rotatable around the switch body (210); and A pressing device (300) is used to connect the upper cover (400) and the lower cover (500), and a trigger rib (510) is provided on the lower cover (500). The pressing device (300) can press against the movable guide rod (230) so that the trigger rib (510) interferes with the rotational movement of the movable guide rod (230).

2. The opening and closing cover structure according to claim 1, characterized in that: The positioning plate (100) and the upper cover (400) are integrally injection-molded.

3. The opening and closing cover structure according to claim 1, characterized in that: The pressing device (300) is a hook.

4. The opening and closing cover structure according to claim 1, characterized in that: A key opening (410) is provided at one end of the upper cover (400), and a key (610) on the key switch (600) can pass through the key opening (410) so that the key switch (600) is connected to the upper cover (400).

5. The opening and closing cover structure according to claim 1, characterized in that: The connection terminal (220) is made of metal sheets.

6. The opening and closing cover structure according to claim 1, characterized in that: A reset spring is arranged inside the micro switch (200), and the movable guide rod (230) can be automatically reset.

7. The opening and closing cover structure according to claim 3, characterized in that: When the upper cover (400) and the lower cover (500) are closed, the hook presses against the movable guide rod (230) so that the trigger rib (510) interferes with the rotational movement of the movable guide rod (230).

8. The opening and closing cover structure according to claim 1, characterized in that: When the upper cover (400) and the lower cover (500) are opened, the trigger rib (510) does not interfere with the automatic reset of the movable guide rod (230).

9. The opening and closing cover structure according to claim 1, characterized in that: The number of the positioning plates (100) is no less than two.

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