Mistaken opening prevention structure of printer paper bin cover switch

Abstract

A structure for preventing a printer paper bin cover switch from being opened by mistake comprises a switch protection key which is installed on a machine shell of a printer in a sliding mode. A switch button is arranged on a shell of the printer; the switch protection key is located on one side of the switch button, the moving direction of the switch protection key is perpendicular to the moving direction of the switch button, and the switch protection key is provided with a limiting bolt. And the limiting bolt is inserted into a limiting groove formed in the switch button. According to the embodiment of the utility model, the switch protection key capable of limiting the switch protection key is arranged, and when the switch protection key does not move and is far away from the switch button, the switch button is prevented from being pressed down by inserting the limiting bolt into the limiting groove, so that a user is prevented from mistakenly touching the switch button of the printer when taking a receipt; and printing interruption caused by accidental opening of the cabin door and subsequent receipt printing failure are prevented, locking of the switch button is achieved through cooperation of a mechanical structure, and compared with key arrangement, the troubles of loss, marking and recording caused by key management are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of self-service settlement equipment, and in particular relates to an anti-mis-opening structure of a printer paper bin cover switch. Background Art

[0002] In the current application of self-service checkout machines, traditional printers are used to print checkout receipts. Although this link is critical, there are obvious design deficiencies. Specifically, after the self-service checkout is completed, the user needs to take out the receipt from the printer by himself. During this process, the user is very likely to accidentally touch the printer's switch when trying to take the receipt, which may cause the printer's door to open accidentally. Once the printer's door is opened, it will not only interrupt the current printing task, but may also cause subsequent users to be unable to print receipts smoothly, thus affecting the continuity and efficiency of the entire checkout process.

[0003] To prevent such problems, the usual solution is to add a door lock to lock the door of the printer to prevent users from accidentally touching it. However, this method introduces the complexity of key management, including: 1. The key may be lost, which will cause the door to be unable to open, the printing paper cannot be replaced, and the settlement device cannot print receipts, affecting the shopping experience; 2. Since self-service settlement terminals are generally equipped with multiple devices, each device corresponds to a key, and the correspondence between each key and the settlement device needs to be marked and recorded, and the keys need to be distributed, stored and recycled every day during the operation, increasing operating costs. Utility Model Content

[0004] In view of the deficiencies existing in the related art, the utility model provides an anti-misopening structure for the printer paper bin cover switch to solve the problems that the printer switch of the current self-service checkout equipment is easily touched by mistake and there is a risk of loss and complex management of the key lock.

[0005] The utility model provides a structure for preventing the mis-opening of a paper bin cover switch of a printer, comprising a switch protection key, which is slidably mounted on a housing of the printer so as to move between a first protection position and a second protection position;

[0006] A switch button capable of reciprocating between a first switch position and a second switch position is mounted on the housing of the printer;

[0007] When the switch button is in the first switch position, the opening mechanism of the printer is not triggered; when the switch button is pressed to move from the first switch position to the second switch position, the switch button triggers the opening mechanism of the printer, so that the opening mechanism opens the paper bin cover of the printer;

[0008] The switch protection key is located on one side of the switch button, and its moving direction is perpendicular to the moving direction of the switch button. The switch protection key has a limit pin;

[0009] When the switch protection key is pushed to move to the second protection position, the limit pin is inserted into the limit slot provided in the switch button to limit the switch button to the first switch position; when the switch protection key is moved to the first protection position, the limit pin is pulled out of the limit slot.

[0010] In some embodiments, a first return spring is installed on the switch button, and when the switch button is pressed and leaves the first switch position, the elastic force generated by the first return spring pushes the switch button toward the first switch position;

[0011] A second return spring is arranged on the switch protection key. When the switch protection key is pushed away from the second protection position, the elastic force of the second return spring pushes the switch protection key toward the second protection position.

[0012] In some embodiments, a switch guide rod provided in the switch button is slidably installed in a switch guide hole provided in the housing, and the first return spring is sleeved and installed on the switch guide rod;

[0013] The protection guide rod provided with the switch protection key is slidably installed in the protection guide hole opened in the casing, and the second reset spring is sleeved and installed on the protection guide rod.

[0014] In some of the embodiments, a guide rib is provided on the switch protection key, which is vertically arranged on the surface of the switch protection key away from the switch button and inserted into a protection guide groove opened in the casing. When the switch protection key moves between the first protection position and the second protection position, the guide rib slides along the protection guide groove.

[0015] In some embodiments, a trigger rod provided on one side of the switch button extends into the space where the opening mechanism is located in the casing through a trigger hole provided in the casing. The trigger hole is a waist hole. When the switch button moves between the first switch position and the second switch position, the trigger rod slides along the trigger hole.

[0016] In some embodiments, the limiting groove is divided into a receiving portion, a transition portion and a limiting portion along the moving direction of the switch button.

[0017] A limit card is provided on the side wall of the transition part. When the switch button is located at the first switch position and the switch protection key is located at the second protection position, the limit pin is located in the limit part and abuts against the limit card to prevent the switch button from moving to the second switch position.

[0018] When the switch button is in the second switch position, the limit latch is aligned with the accommodating portion;

[0019] The limit card has an inclined surface. When the switch protection key is located at the second protection position and the switch button moves from the second switch position to the first switch position, the limit latch moves from the accommodating portion to the accommodating portion through the inclined surface.

[0020] In some embodiments, the width of the transition portion connected to one end of the limiting portion is greater than or equal to the width of the limiting pin.

[0021] In some embodiments, when the limiting latch is located in the accommodating portion, two sides thereof are spaced apart from the side walls of the accommodating portion respectively.

[0022] In some embodiments, the limiting latch is an elastic member.

[0023] In some embodiments, two limiting grooves are symmetrically arranged, and two limiting latches are correspondingly arranged.

[0024] Based on the above technical scheme, in the embodiment of the utility model, a switch protection key that can limit the switch button for opening the printer paper compartment cover is provided on one side of the switch button. When the switch protection key does not move and is away from the switch button, the switch button is prevented from being pressed by the connection between the limit pin and the limit slot, thereby preventing the user from accidentally touching the switch button of the printer when taking the receipt, preventing the door from accidentally opening, resulting in printing interruption and subsequent inability to print the receipt. The switch button is locked through the cooperation of the mechanical structure. Compared with being equipped with keys, the trouble of loss, marking and recording caused by key management is eliminated, and there is no need to distribute, store and recycle keys, which reduces operating costs and solves the problems that the printer switch of the current self-service checkout equipment is easily touched by mistake and there is a risk of loss and complex management when equipped with key locking. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0026] Figure 1 It is a structural schematic diagram of the anti-misopening structure of the paper bin cover switch of the printer of the utility model;

[0027] Figure 2 It is a cross-sectional structural diagram of the anti-misopening structure of the paper bin cover switch of the printer of the utility model;

[0028] Figure 3 It is a schematic diagram of the assembly structure of the switch button and the switch protection key when the switch button is in the first switch position and the switch protection key is in the second protection position in the anti-misopening structure of the paper bin cover switch of the printer of the utility model;

[0029] Figure 4 It is a schematic diagram of the assembly structure of the limit pin and the limit slot when the switch button is in the first switch position and the switch protection key is in the second protection position in the anti-misopening structure of the paper bin cover switch of the printer of the utility model;

[0030] Figure 5 It is a schematic diagram of the assembly structure of the switch button and the switch protection key when the switch button is in the first switch position and the switch protection key is in the first protection position in the anti-misopening structure of the paper bin cover switch of the printer of the utility model;

[0031] Figure 6 It is a schematic diagram of the assembly structure of the switch button and the switch protection key when the switch button is in the second switch position and the switch protection key is in the first protection position in the anti-misopening structure of the paper bin cover switch of the printer of the utility model;

[0032] Figure 7 It is a schematic diagram of the assembly structure of the switch button and the switch protection key when the switch button is in the second switch position and the switch protection key is in the second protection position in the anti-misopening structure of the paper bin cover switch of the printer of the utility model;

[0033] Figure 8 The utility model is a schematic diagram of the assembly structure of the switch button and the switch protection key in the anti-misopening structure of the paper bin cover switch of the printer, when the switch protection key is in the second protection position and the switch button moves to the first switch position.

[0034] In the figure:

[0035] 11. Casing; 12. Paper bin cover; 13. Opening mechanism; 14. Lever; 15. Switch guide hole; 16. Protection guide hole; 17. Protection guide groove; 18. Trigger hole;

[0036] 2. Switch protection key; 21. Limit latch; 22. Protection guide rod; 23. Guide rib plate;

[0037] 3. switch button; 31. limit groove; 32. switch guide rod; 33. trigger rod; 34. accommodating part; 35. transition part; 36. limit part; 37. limit card; 38. inclined surface;

[0038] 41. First return spring; 42. Second return spring. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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 and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] like Figures 1 to 3 As shown, in an illustrative embodiment of the structure for preventing the paper bin cover 12 of the printer from being opened accidentally, the structure for preventing the paper bin cover 12 of the printer from being opened accidentally includes a switch protection key 2 .

[0044] The printer has a housing 11, and a paper bin cover 12 is installed on the front side of the housing 11, which is used to open and close the printing paper bin set in the housing 11, and the printing paper bin stores printing paper. A switch button 3 is installed on the housing 11, and the switch button 3 faces the front side and reciprocates between a first switch position and a second switch position in the front-back direction. An opening mechanism 13 is installed in the housing 11, and the opening mechanism 13 has a lever 14. When the lever 14 is pulled, the opening mechanism 13 drives the paper bin cover 12 to pop up and open.

[0045] When the switch button 3 is in the first switch position, the switch button 3 does not contact the lever 14 of the opening mechanism 13, or the switch button 3 contacts the lever 14 but the lever 14 is in the initial state, the opening mechanism 13 is not triggered, and the paper bin cover 12 remains closed. Pressing the switch button 3 makes it move backward from the first switch position to the second switch position, the switch button 3 pushes the lever 14 of the opening mechanism 13, and the lever 14 is pulled, thereby triggering the opening mechanism 13, and the opening mechanism 13 drives the paper bin cover 12 to open. The above is the existing printer structure and the working principle of opening its paper bin cover 12, which is not the invention of this application.

[0046] The switch protection key 2 has a limit pin 21, and the switch protection key 2 is slidably mounted on the printer housing 11 so as to move between a first protection position and a second protection position. The switch protection key 2 is located on one side of the switch button 3, and its moving direction is perpendicular to the moving direction of the switch button 3, so that when the switch protection key 2 moves toward the switch button 3, the limit pin 21 can be inserted into the limit slot 31 provided on the switch button 3 from the side.

[0047] When the switch protection key 2 is pushed to move it to the second protection position, the limit pin 21 is inserted into the limit slot 31 opened by the switch button 3. At this time, the switch button 3 is pressed, and the limit pin 21 blocks the switch button 3 from moving to the second switch position, so that it remains in the first switch position, locking the switch button 3, thereby preventing the switch button 3 from pulling the lever 14 to trigger the opening mechanism 13, keeping the paper bin cover 12 closed, and preventing the user from accidentally touching and pressing the switch button 3 when taking the receipt, causing the paper bin cover 12 to be opened.

[0048] The switch protection key 2 is manually moved from the second protection position to the first protection position, and the limit pin 21 is pulled out of the limit slot 31, eliminating the restriction on the switch button 3. At this time, the switch button 3 can be pressed, and the lever 14 is pulled to trigger the opening mechanism 13 to open the paper compartment cover 12, thereby loading new printing paper into the printer and allowing the printer to continue printing receipts.

[0049] In the above-mentioned schematic embodiment, the anti-misopening structure of the switch of the printer paper compartment cover 12 is provided with a switch protection key 2 that can limit the switch button 3 for opening the printer paper compartment cover 12. When the switch protection key 2 does not move and is away from the switch button 3, the switch button 3 is prevented from being pressed by the connection between the limit pin 21 and the limit slot 31, thereby preventing the user from accidentally touching the switch button 3 of the printer when taking the receipt, preventing the door from accidentally opening, resulting in printing interruption and subsequent inability to print the receipt. The switch button 3 is locked through the cooperation of the mechanical structure. Compared with being equipped with keys, the trouble of loss, marking and recording caused by key management is eliminated, and there is no need to distribute, store and recycle keys, which reduces operating costs and solves the problems that the printer switch of the current self-service settlement equipment is easy to be accidentally touched and there is a risk of loss and complex management when equipped with key locking.

[0050] In some embodiments, a first return spring 41 is installed on the switch button 3, and the first return spring 41 is installed along the moving direction of the switch button 3. A second return spring 42 is installed on the switch protection key 2, and the second return spring 42 is installed along the moving direction of the switch protection key 2. Both the first return spring 41 and the second return spring 42 are compression springs.

[0051] The switch button 3 is pressed to move from the first switch position to the second switch position, and the first return spring 41 is compressed. The generated elastic force acts on the switch button 3, and the direction of the elastic force is toward the first switch position. Therefore, after the switch button 3 is released, the elastic force of the first return spring 41 pushes the switch button 3 to the first switch position, so that it returns to the first switch position.

[0052] The switch protection key 2 is toggled to move from the second protection position to the first protection position, and the second return spring 42 is compressed. The generated elastic force acts on the switch protection key 2, and the direction of the elastic force is toward the second protection position. Therefore, after the switch protection key 2 is released, the elastic force of the second return spring 42 pushes the switch protection key 2 toward the switch button 3. When the limit pin 21 is aligned with its limit groove 31, the switch protection key 2 returns to the second protection position, and the limit pin 21 is inserted into the limit groove 31, so that the switch protection key 2 resumes the limit lock on the switch button 3.

[0053] In addition, after the limit pin 21 of the switch protection key 2 is pulled out of the limit slot 31, and the switch button 3 is pressed and the paper bin cover 12 is opened, the switch protection key 2 is released, and the second return spring 42 pushes the switch protection key 2, so that the end of the limit pin 21 is attached to the side wall of the switch button 3, and then the switch button 3 is further released, and the first return spring 41 pushes the switch button 3 to reset. During the movement of the switch button 3 to the first switch position, the end of the limit pin 21 slides on the side wall of the switch button 3 until the limit slot 31 moves and aligns with the limit pin 21. Under the action of the elastic force generated by the second return spring 42, the limit pin 21 is inserted into the limit slot 31, and the switch protection key 2 returns to the second protection position, and the lock of the switch button 3 is restored. Therefore, after the switch button 3 is pressed, the switch protection key 2 can be released, and further releasing the switch button 3 can reset the switch button 3 and the switch protection key 2, making it easier to restore the locked state of the switch button 3.

[0054] In some embodiments, the switch guide rod 32 provided for the switch button 3 is slidably installed in the switch guide hole 15 provided in the housing 11, and the protection guide rod 22 provided for the switch protection key 2 is slidably installed in the protection guide hole 16 provided in the housing 11, thereby respectively realizing the movable installation of the switch button 3 and the sliding of the switch protection key 2. The switch guide rod 32 is perpendicular to the protection guide rod 22, so that the moving direction of the switch button 3 is perpendicular to the moving direction of the switch protection key 2.

[0055] The first return spring 41 is sleeved and installed on the switch guide rod 32, and the second return spring 42 is sleeved and installed on the protection guide rod 22. One end of the first return spring 41 is against the surface of the housing 11 on the corresponding side, and the other end is against the switch button 3 or fixed on the switch guide rod 32. When the switch button 3 is pressed, the distance between the switch button 3 and the surface of the housing 11 opposite to it is reduced, and the switch guide rod 32 passes through the switch guide hole 15 more, and the first return spring 41 is compressed, so that it generates an elastic force acting on the first switch position. One end of the second return spring 42 is against the surface of the housing 11 on the corresponding side, and the other end is against the switch protection key 2 or fixed on the protection guide rod 22. When the switch protection key 2 is moved to the first protection position, the switch protection key 2 is away from the switch button 3 and close to the surface of the housing 11 opposite to it, so that the distance between it and the surface of the housing 11 opposite to it is reduced, and the protection guide rod 22 passes through the protection guide hole 16 more, and the second return spring 42 is compressed, so that it generates an elastic force acting on the second protection position. The movable installation of the components and the installation of the return spring are achieved by the guide rod, making the structure more compact and convenient for setting up in a compact receipt printer.

[0056] In some embodiments, a guide rib 23 is provided on the switch protection key 2. The guide rib 23 is vertically arranged on the surface of the switch protection key 2 away from the switch button 3, and is inserted into the protection guide groove 17 opened in the housing 11. When the switch protection key 2 moves between the first protection position and the second protection position, the guide rib 23 slides along the protection guide groove 17.

[0057] The guide rib plate 23 and the protection guide groove 17 are slidably matched to guide the movement of the switch protection key 2, and the switch protection key 2 is limited in a direction perpendicular to its moving direction to prevent the switch protection key 2 from being pressed in the same direction as the switch button 3. In addition, the guide rib plate 23 can serve as a reinforcing plate to increase the structural strength of the switch protection key 2.

[0058] In some embodiments, a trigger rod 33 provided on one side of the switch button 3 extends into the space where the opening mechanism 13 is located in the housing 11 through a trigger hole 18 provided in the housing 11. The trigger hole 18 is a waist hole. When the switch button 3 moves between the first switch position and the second switch position, the trigger rod slides along the trigger hole 18.

[0059] The trigger hole 18 can limit the trigger rod 33 in the front-to-back direction, preventing the switch button 3 from escaping forward from the housing 11, and maintaining a movable connection with the housing 11. When the switch button 3 moves to the second switch position, the trigger rod 33 moves therewith and contacts and pushes the lever 14 backward, thereby pulling the lever 14 to trigger the opening mechanism 13 and open the paper bin cover 12.

[0060] In some embodiments, Figures 3 to 8 As shown, the limiting groove 31 is divided into a receiving portion 34 , a transition portion 35 and a limiting portion 36 along the moving direction of the switch button 3 .

[0061] A limit card 37 is provided on the side wall of the transition portion 35. Figure 3 to Figure 4 As shown, when the switch button 3 is located at the first switch position and the switch protection key 2 is located at the second protection position, the limit latch 21 is located in the limit portion 36 and the limit card 37 is engaged therewith, and the limit latch 21 presses against the limit latch 21, thereby preventing the switch button 3 from moving to the second switch position, thereby locking the switch button 3.

[0062] like Figure 6 As shown, when the switch button 3 is in the second switch position, the limit pin 21 is aligned with the accommodating portion 34 , and the switch protection key 2 can be returned to the second protection position at this time, and the limit pin 21 can be inserted into the accommodating portion 34 of the limit slot 31 .

[0063] The limit card 37 has an inclined surface 38, such as Figures 7 and 8As shown, when the switch protection key 2 is located in the second protection position and the switch button 3 moves from the second switch position to the first switch position, the limit pin 21 moves from the accommodating portion 34 to the limit portion 36 in the limit groove 31. When moving to the transition portion 35, the limit pin 21 slides along the inclined surface 38 of the limit card 37. The inclined surface guides the limit pin 21 to deviate to one side, so that it passes over the limit card 37 and is stuck in the limit portion 36, thereby restoring the limit on the switch button 3 and locking it to prevent the switch button 3 from being opened due to accidental touch.

[0064] The limit groove 31 is opened along the moving direction of the switch button 3 and is divided into three sections, so that the switch protection key 2 can return to the limit groove 31 earlier. When the reset spring is installed on the switch protection key 2, the limit pin 21 is prevented from sliding on the side wall of the switch button 3 to cause wear, and the reset spring is prevented from being in a compressed state for a long time, thereby improving the service life of the switch button 3 and the reset spring.

[0065] In some embodiments, the width of the transition portion 35 connecting one end of the limiting portion 36 is greater than or equal to the width of the limiting pin 21, thereby ensuring that when the limiting pin 21 moves relative to the limiting groove 31, it can enter the limiting portion 36 through the transition portion 35, avoiding jamming and ensuring the reliability of the limiting function.

[0066] In some embodiments, when the limit pin 21 is located in the accommodating portion 34, its two sides are spaced from the side walls of the accommodating portion 34, so that the width of the accommodating portion 34 is greater than the limit pin 21. When the switch protection key 2 is located in the first protection position and the limit pin 21 is aligned with the accommodating portion 34, the accommodating portion 34 with a larger width can ensure that it is aligned with the limit pin 21. When the switch protection key 2 moves to the second protection position, the limit pin 21 can be inserted into the accommodating portion 34 more accurately and smoothly, avoiding the limit pin 21 from being stuck on the side wall of the switch button 3.

[0067] In some embodiments, the limit pin 21 is an elastic member, which can produce adaptive elastic deformation during movement and smoothly cross the limit card 37, further improving the smoothness and stability of the limit pin 21, avoiding the limit pin 21 from getting stuck when moving in the limit slot 31, and improving the convenience and safety of printer operation.

[0068] In some embodiments, two limit slots 31 are symmetrically arranged, and two limit pins 21 are correspondingly arranged, thereby realizing symmetrical limiting of the switch button 3, further improving the stability and reliability of the limiting function, avoiding the offset and jamming caused by unilateral limiting, and improving the convenience and safety of printer operation.

[0069] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0070] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A printer paper cover switch anti-misopening structure, characterized in that: It includes a switch protection key, which is slidably mounted on the housing of the printer so as to move between a first protection position and a second protection position; The housing of the printer is provided with a switch button which can reciprocate between a first switch position and a second switch position; When the switch button is located at the first switch position, the opening mechanism of the printer is not triggered; when the switch button is pressed to move from the first switch position to the second switch position, the switch button triggers the opening mechanism of the printer, so that the opening mechanism opens the paper bin cover of the printer; The switch protection key is located at one side of the switch button, and its moving direction is perpendicular to the moving direction of the switch button, and the switch protection key has a limit latch; When the switch protection key is pushed to move to the second protection position, the limit pin is inserted into the limit slot provided in the switch button to limit the switch button to the first switch position; when the switch protection key is moved to the first protection position, the limit pin is pulled out of the limit slot.

2. The anti-mis-opening structure of the printer paper compartment cover switch according to claim 1, characterized in that: A first return spring is installed on the switch button. When the switch button is pressed and leaves the first switch position, the elastic force generated by the first return spring pushes the switch button toward the first switch position. A second return spring is installed on the switch protection key. When the switch protection key is pushed away from the second protection position, the elastic force of the second return spring pushes the switch protection key toward the second protection position.

3. The anti-mis-opening structure of the printer paper compartment cover switch according to claim 2, characterized in that: The switch guide rod provided on the switch button is slidably installed in the switch guide hole provided on the housing, and the first return spring is sleeved and installed on the switch guide rod; The protection guide rod provided on the switch protection key is slidably installed in the protection guide hole opened in the housing, and the second return spring is sleeved on the protection guide rod.

4. The anti-mis-opening structure of the printer paper compartment cover switch according to claim 2, characterized in that: A guide rib is provided on the switch protection key, and the guide rib is vertically arranged on the surface of the switch protection key away from the switch button, and is inserted into a protection guide groove opened in the casing. When the switch protection key moves between the first protection position and the second protection position, the guide rib slides along the protection guide groove.

5. The anti-mis-opening structure of the printer paper compartment cover switch according to claim 2, characterized in that: The trigger rod arranged on one side of the switch button extends into the space where the opening mechanism is located in the casing through the trigger hole arranged in the casing, and the trigger hole is a waist hole. When the switch button moves between the first switch position and the second switch position, the trigger rod slides along the trigger hole.

6. The anti-mis-opening structure of the printer paper compartment cover switch according to any one of claims 1 to 5, characterized in that: The limiting groove is divided into a receiving portion, a transition portion and a limiting portion along the moving direction of the switch button. A limit card is provided on the side wall of the transition portion, and when the switch button is located at the first switch position and the switch protection key is located at the second protection position, the limit latch is located in the limit portion and abuts against the limit card to prevent the switch button from moving to the second switch position; When the switch button is located at the second switch position, the limit latch is aligned with the accommodating portion; The limit card has an inclined surface, and when the switch protection key is located at the second protection position and the switch button moves from the second switch position to the first switch position, the limit latch moves from the accommodating portion to the accommodating portion through the inclined surface.

7. The anti-mis-opening structure of the printer paper compartment cover switch according to claim 6, characterized in that: The width of the transition portion connected to one end of the limiting portion is greater than or equal to the width of the limiting latch.

8. The anti-mis-opening structure of the printer paper compartment cover switch according to claim 6, characterized in that: When the limit latch is located in the accommodating portion, two sides of the limit latch are spaced apart from the side walls of the accommodating portion respectively.

9. The anti-mis-opening structure of the printer paper compartment cover switch according to claim 6, characterized in that: The limiting latch is an elastic member.

10. The anti-mis-opening structure of the printer paper compartment cover switch according to claim 6, characterized in that: The limiting grooves are symmetrically arranged with two, and the limiting latches are correspondingly arranged with two.

Images