Dual-switch linkage anti-mis-touch device, anti-mis-touch method and electric pencil sharpener

Abstract

The application discloses a double-switch linkage anti-misoperation device, an anti-misoperation method and an electric pencil sharpener. The double-switch linkage anti-misoperation device comprises a pencil sharpener mechanism and a driving mechanism. The periphery of a connecting head of the pencil sharpener mechanism is provided with a correction trigger part. The upper end of a floating transmission assembly of the driving mechanism is provided with a driving interface, and a first trigger switch is arranged on the floating path of the floating transmission assembly. The same horizontal position of the driving interface is provided with a correction trigger switch, and the correction trigger switch is located on the floating path of the correction trigger part. When the connecting head is aligned with the driving interface and is connected to the driving interface, the pencil sharpener mechanism sinks and pushes the floating transmission assembly to move downward to trigger the first trigger switch, and the correction trigger part triggers the correction trigger switch at the same time. Only when the first trigger switch and the correction trigger switch are triggered at the same time, the driving mechanism can drive the pencil sharpener mechanism through the connecting head. The double-switch linkage mechanism effectively prevents the floating type cutter holder from triggering the motor by mistake, and improves the use safety.

Description

Technical Field

[0001] This invention relates to a safety protection device for a pencil sharpener, and more particularly to a dual-switch linkage anti-accidental-touch device, an anti-accidental-touch method, and an electric pencil sharpener with the modified anti-accidental-touch device. Background Technology

[0002] With the increasing popularity of electric pencil sharpeners, multifunctional electric pencil sharpeners that integrate multiple functions such as automatic pencil feeding, automatic pencil sharpening, automatic pencil retraction, and pencil tip thickness adjustment have become the development trend in the pencil sharpener industry.

[0003] Various floating electric pencil sharpeners have emerged in the prior art. For example, the invention patent with publication number CN121590170A discloses a single-switch floating electric pencil sharpener with adjustable coarseness and fineness. Its pencil feeding mechanism and cutting mechanism are fixedly connected by a fixing member to form an integrated pencil sharpening mechanism that can float up and down. After the pencil is inserted into the pencil feeding channel, it pushes the integrated pencil sharpening mechanism to move downward in the second floating range. The connecting head pushes the last stage gear of the transmission gear set to move downward. The last stage gear pushes the push rod to trigger a multi-stage trigger switch at once, starting the motor, thereby realizing automatic pencil feeding and automatic cutting.

[0004] For example, the single-switch opening and closing mechanism of the pencil sharpener disclosed in the utility model patent with authorization publication number CN217649199U has a transmission shaft connected to the blade assembly. When the blade assembly is subjected to downward pressure, it moves downward along with the transmission shaft. The transmission shaft directly or indirectly contacts the micro switch, which triggers the motor to rotate forward to start cutting the pencil.

[0005] For example, the electric pencil sharpener disclosed in the invention patent with authorization publication number CN113580821B has a pencil sharpener that can be floated up and down inside the upper cover assembly. When the pencil is inserted, the pencil sharpener moves downward, causing the rotating shaft to touch the micro switch downward, thereby starting the motor to drive the pencil sharpener to rotate and cut.

[0006] Floating pencil sharpeners typically feature a detachable floating blade holder for easy shavings removal. This holder, integrated with the feeding mechanism and top cover, can be separated from the lower housing to empty accumulated shavings. However, when reinstalling the top cover after cleaning, the connector at the bottom of the blade holder must be accurately aligned with the drive interface of the transmission mechanism. Because the transmission mechanism is also floating, the floating blade holder may tilt slightly during reinstallation, causing the connector to misalign with the center of the drive interface and accidentally press against its edge. This partial downward pressure on the drive assembly could trigger the bottom switch, causing the motor to start unnecessarily, posing a safety hazard.

[0007] Existing technologies lack effective protection mechanisms against accidental triggering of the motor due to tilting during the reassembly process of the aforementioned floating tool holder. How to effectively prevent accidental motor triggering due to tilting during the reassembly process of the floating tool holder without affecting normal pencil-sharpening function is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a dual-switch linkage anti-accidental-touch device, an anti-accidental-touch method, and an electric pencil sharpener. By adding a calibration trigger switch at the same horizontal position of the drive interface and using a dual-switch linkage mechanism to ensure that the motor is triggered only when the blade holder is aligned, the floating blade holder is effectively prevented from accidentally triggering the motor due to tilting during reassembly, thereby improving the safety of use.

[0009] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a dual-switch linkage anti-accidental touch device, including a pencil sharpening mechanism and a driving mechanism; The lower end of the pencil sharpening mechanism is provided with a connector, and a correction trigger part is provided around the connector; The drive mechanism has a floating transmission component; the upper end of the floating transmission component is provided with a drive interface for the connector to access, and a first trigger switch is provided on the floating path of the floating transmission component; A calibration trigger switch is provided at the same horizontal position as the drive interface, and the calibration trigger switch is located on the floating path of the calibration trigger part; When the connector is aligned with and connected to the drive interface, the pencil sharpening mechanism sinks down and pushes the floating transmission component to move down to trigger the first trigger switch, and at the same time the correction triggering part triggers the correction trigger switch. The drive mechanism can drive the pencil sharpening mechanism through the connector only when the first trigger switch and the correction trigger switch are triggered simultaneously.

[0010] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the pencil sharpening mechanism includes a tool assembly mounting bracket and a tool assembly; The tool assembly mounting bracket is provided with a base plate, and the base plate has a connection hole; the calibration trigger is located on the lower surface of the base plate and around the connection hole; The tool assembly is installed in the tool assembly mounting bracket, and the connector extends out of the tool assembly mounting bracket through the connecting hole to connect to the drive interface.

[0011] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the driving mechanism further includes a controller, and the first trigger switch and the correction trigger switch are respectively electrically connected to the controller; The controller controls the drive mechanism to drive the pencil sharpening mechanism through the connector only when it simultaneously receives a first trigger signal generated by the first trigger switch being triggered and a correction trigger signal generated by the correction trigger switch being triggered.

[0012] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the drive mechanism further includes a motor, a gear assembly, and a main control board; the first trigger switch and the controller are disposed on the main control board; The main control board is located below the gear assembly; the floating transmission assembly passes through the gear assembly and connects the upper connector and the lower first trigger switch; When the motor starts, it drives the gear assembly, which in turn drives the floating transmission assembly to rotate. The drive interface drives the connector to rotate, which in turn drives the pencil sharpening mechanism. The trigger signal of the calibration trigger switch is transmitted to the controller via a wire.

[0013] The preferred technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: the floating transmission component includes a sleeve, and the sleeve constitutes the drive interface; A circumferential limiting structure is provided between the sleeve and the connector; The final gear of the gear assembly is connected to the sleeve, and the sleeve is driven to rotate, thereby driving the connector to rotate.

[0014] Another technical solution adopted by the present invention to solve the above-mentioned technical problems is: an electric pencil sharpener, comprising a first separable unit and a second separable unit that can be separated from each other; The first separable unit includes an upper housing, a pen feeding mechanism, and the pen sharpening mechanism; The second separable unit includes a lower housing and a drive mechanism; It also includes the dual-switch linkage anti-accidental touch device as described in any one of claims 1-5; When the first separable unit and the second separable unit are assembled together, the connector is aligned with the drive interface and connected to the drive interface, and the calibration triggering part triggers the calibration triggering switch facing the drive interface.

[0015] Another preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is: the lower housing is provided with a partition to divide the lower housing into a first cavity with an upper opening and a second cavity for accommodating the driving mechanism; The partition plate is provided with a first through hole, and a second through hole is provided on the side of the first through hole; The drive interface is exposed in the first cavity through the first through hole, and the calibration trigger switch is exposed in the second cavity through the second through hole, so that the drive interface and the calibration trigger switch are at the same horizontal position.

[0016] Another preferred embodiment of the technical solution adopted by the present invention to solve the above-mentioned technical problem is: the lower side of the partition is provided with a first cavity for accommodating at least a portion of the driving mechanism; The lower side of the partition is recessed to accommodate the calibration trigger switch; The first through hole is formed at the top of the first cavity; the outer periphery of the first through hole is provided with a hole wall extending into the first cavity; the top surface of the hole wall is at the same horizontal position as the calibration trigger switch; The calibration trigger switch is installed in the second cavity, and the second through hole is opened at the top of the second cavity.

[0017] Another preferred technical solution adopted by the present invention to solve the above-mentioned technical problem is that the first separable unit further includes a fixed frame and a floating frame; The pen feeding mechanism and the pen sharpening mechanism are connected to the floating frame to form a floating pen sharpening mechanism; The fixing frame is fixedly connected to the upper housing; A plurality of return springs are provided between the floating frame and the fixed frame; When the connector is aligned with and connected to the drive interface, the floating pencil sharpening mechanism sinks and pushes the floating transmission component to move down to trigger the first trigger switch, and at the same time the correction triggering part triggers the correction trigger switch.

[0018] Another technical solution adopted by the present invention to solve the above-mentioned technical problems is: a dual-switch linkage anti-accidental touch method, the controlled object of which is a dual-switch linkage anti-accidental touch device; Includes the following steps: Receive the first trigger signal generated when the first trigger switch is triggered; Determine whether a correction trigger signal is received simultaneously, indicating that the correction trigger switch has been triggered. If not, wait for a correction trigger signal from the correction trigger switch. If so, a start signal is sent to the drive mechanism to drive the pencil sharpening mechanism through the connector.

[0019] Compared with the prior art, the advantages of the present invention are: First, the dual-switch linkage mechanism effectively prevents the motor from being accidentally triggered due to tilting during the reassembly of the floating tool holder.

[0020] This invention adds a calibration trigger switch at the same horizontal position as the drive interface. The calibration trigger part at the lower end of the pencil sharpening mechanism, in conjunction with the calibration trigger switch, forms a dual-switch linkage with the original first trigger switch. The drive mechanism can only drive the pencil sharpening mechanism through the connector when the connector is accurately aligned and connected to the drive interface, and when both the first trigger switch and the calibration trigger switch are triggered simultaneously. If, during reassembly, the connector is tilted and misaligned with the center of the drive interface, or shifts and presses against the edge of the drive interface, even if the floating transmission component is partially pressed down and the first trigger switch is mistakenly triggered, the calibration trigger switch remains in an untriggered state because the connector tilt prevents the calibration trigger part from aligning with it. This prevents the drive mechanism from starting, fundamentally eliminating the safety hazard of accidental motor start-up.

[0021] Second, reliable anti-accidental touch judgment is achieved through control logic, resulting in better system scalability.

[0022] The dual-switch linkage anti-misoperation method of this invention receives the first trigger signal generated by the first trigger switch being triggered by the controller, and determines whether a correction trigger signal is simultaneously received from the correction trigger switch. Only when both trigger signals are received simultaneously will a start signal be sent to the drive mechanism. If, during reassembly, tilting causes only the first trigger switch to be mistakenly triggered, the controller will not send a motor start signal until the correction trigger signal is received simultaneously, effectively preventing accidental motor start-up due to tilting during the reassembly of the floating tool holder. Furthermore, this control method uses a controller for signal acquisition and logic judgment. Compared to a simple series circuit scheme, it facilitates the further integration of intelligent functions such as delay judgment, fault diagnosis, and status indication. The system reliability and scalability are significantly better than a pure circuit scheme.

[0023] Third, without affecting the normal pencil sharpening function and the detachable cleaning function, improve the overall safety of electric pencil sharpeners.

[0024] This invention integrates the anti-accidental-touch function into the detachable structure of an electric pencil sharpener by setting a dual-switch linkage anti-accidental-touch device between a first and second detachable unit that can be separated from each other. When the first and second detachable units are assembled, the connector is aligned with the drive interface and connected to the drive interface. The calibration triggering unit triggers the calibration triggering switch, and both switches are triggered simultaneously, allowing the drive mechanism to start and operate normally without affecting the normal pencil sharpening function. After separating the first and second detachable units, the pencil shavings in the shavings collection bin can be emptied and cleaned without affecting the detachable cleaning function. During the process of reassembling the upper housing after cleaning, if the connector is not accurately aligned with the drive interface and tilts, even if the first triggering switch is accidentally triggered, the controller will not send a start signal because the calibration triggering switch is not triggered, and the motor remains in the off state. This effectively prevents the motor from accidentally starting due to improper operation during reassembly, significantly improving safety. Moreover, users do not need to pay special attention to alignment accuracy, resulting in a smooth and natural operating experience. Attached Figure Description

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0026] Figure 1 This is a schematic diagram of an electric pencil sharpener. Figure 2 This is a schematic diagram of the structure of an electric pencil sharpener when the first separable unit and the second separable unit are separated. Figure 3 This is a schematic diagram of the internal structure of an electric pencil sharpener and its dual-switch linkage anti-accidental-touch device. Figure 4 A cross-sectional view of an electric pencil sharpener and its dual-switch linkage anti-accidental-touch device; Figure 5 This is an exploded view of the first separable unit; Figure 6 A schematic diagram of the main control board and its components; Figure 7 Schematic diagram of the lower shell structure Figure 1 ; Figure 8 Schematic diagram of the lower shell structure Figure 2 ; Figure 9 Schematic diagram of the drive mechanism Figure 1 ; Figure 10 Schematic diagram of the drive mechanism Figure 2 ; Explanation of reference numerals in the attached figures: Dual-switch linkage anti-accidental-touch device 100, pencil sharpening mechanism 10, tool assembly mounting bracket 11, tool assembly 12, connector 13, base plate 14, connecting hole 15, calibration trigger part 16, pencil feeding mechanism 20, drive mechanism 30, floating transmission assembly 31, sleeve 32, drive interface 33, gear assembly 34, motor 35, main control board 36, plug 37, trigger element 38, push rod 39, gear mounting bracket 40, bracket base plate 41, bracket top plate 42, battery 43, bottom cover 44, first trigger switch 1 01. Correction trigger switch 102. Second trigger switch 103. Wire 104. Floating pencil sharpening mechanism 104. First separable unit 201. Upper housing 51. Pencil inlet hole 52. Floating frame 53. Reset spring 54. Fixing frame 55. Second separable unit 202. Lower housing 61. Partition 62. First cavity 63. Second cavity 64. First through hole 65. Hole wall 65a. Second through hole 66. First concave cavity 67. Second concave cavity 68. Electric pencil sharpener 200. Pencil to be sharpened 300. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] like Figures 1 to 10 The electric pencil sharpener 200 provided in this embodiment is shown, which includes a first separable unit 201 and a second separable unit 202 that are detachable from each other. The first separable unit 201 includes an upper housing 51, a pencil feeding mechanism 20, and a pencil sharpening mechanism 10. The second separable unit 202 includes a lower housing 61 and a drive mechanism 30. A detachable connection structure is provided between the upper housing 51 and the lower housing 61 to realize a separable and assembleable connection between the first separable unit 201 and the second separable unit 202.

[0029] The top of the upper housing 51 is provided with a pen inlet hole 52. The pen feeding mechanism 20 includes a roller assembly, and a pen feeding channel is provided between the roller assemblies. The pencil sharpening mechanism 10 includes a tool assembly mounting bracket 11 and a tool assembly 12, with the tool assembly 12 mounted inside the tool assembly mounting bracket 11. In this embodiment, the tool assembly 12 is a hob assembly, and the rotation center of the hob forms a pencil cutting position. The upper end of the tool assembly 12 is connected to and can drive the roller assembly.

[0030] The pencil 300 to be sharpened is inserted into the feeding channel between the roller assemblies through the feeding hole 52, enters the pencil cutting position between the roller cutter assemblies, and continues to be pressed downwards. The feeding mechanism 20 and the sharpening mechanism 10 sink down, the roller cutter assembly is driven to cut the pencil, and the roller assemblies are simultaneously driven downwards to feed the pencil. The structure and driving principle of the roller assembly in the feeding mechanism 20 and the roller cutter assembly in the sharpening mechanism 10 are existing technologies in the field of electric pencil sharpeners and will not be described in detail here.

[0031] The electric pencil sharpener 200 provided in this embodiment also includes a dual-switch linkage anti-accidental-touch device 100. Specifically, as shown... Figures 2 to 10 As shown, the lower end of the pencil sharpening mechanism 10 is provided with a connector 13, and a correction trigger part 16 is provided around the connector 13. The drive mechanism 30 has a floating transmission assembly 31. The upper end of the floating transmission assembly 31 is provided with a drive interface 33 for the connector 13 to enter. A first trigger switch 101 is provided on the floating path of the floating transmission assembly 31, and the lower end of the floating transmission assembly 31 is triggerably connected to the first trigger switch 101. A correction trigger switch 102 is provided at the same horizontal position as the drive interface 33, and the correction trigger switch 102 is located on the floating path of the correction trigger part 16.

[0032] By setting a calibration trigger part 16 on the periphery of the connector 13 and setting a calibration trigger switch 102 at the same horizontal position on the drive interface 33, a dual-switch linkage mechanism is formed with the original first trigger switch 101. The drive mechanism 30 can only be started when both switches are triggered simultaneously. This structure is simple and does not require additional complex sensing devices, effectively preventing false triggering caused by misalignment of the connector 13, thus improving the safety and reliability of the device.

[0033] like Figure 3 and Figure 4 As shown, when the connector 13 is aligned with and connected to the drive interface 33, the pencil sharpening mechanism 10 sinks and pushes the floating transmission component 31 downward to trigger the first trigger switch 101. At the same time, the correction trigger unit 16 triggers the correction trigger switch 102. Only when the first trigger switch 101 and the correction trigger switch 102 are triggered simultaneously can the drive mechanism 30 drive the pencil sharpening mechanism 10 through the connector 13 to cut the pencil.

[0034] When the connector 13 fails to align with the drive interface 33 and instead presses against the edge of the drive interface 33 at an offset position, causing the floating transmission component 31 to be pressed down inappropriately and triggering the first trigger switch 101, the correction trigger part 16 is not triggered at this time, and the drive mechanism 30 will not be started to drive the pencil sharpening mechanism 10 in an unnatural way, thereby ensuring the user's physical safety.

[0035] Specifically, such as Figure 2 and Figure 5As shown, the tool assembly mounting bracket 11 has a base plate 14 with a connection hole 15. A calibration trigger 16 is disposed on the lower surface of the base plate 14, around the connection hole 15. The tool assembly 12 is mounted inside the tool assembly mounting bracket 11, and the connector 13 extends out of the tool assembly mounting bracket 11 through the connection hole 15 to connect to the drive interface 33. The calibration trigger 16 is an annular portion of the lower surface of the base plate 14 surrounding the connector 13. In other embodiments, the calibration trigger 16 may also be an annular flange or a plurality of spaced protrusions disposed on the lower surface of the base plate 14.

[0036] By setting the calibration trigger part 16 on the lower surface of the base plate 14 and around the connection hole 15, the calibration trigger part 16 and the connector 13 are arranged coaxially. When the connector 13 is aligned with the drive interface 33, the calibration trigger part 16 can be aligned synchronously with the calibration trigger switch 102, ensuring the consistency and accuracy of the trigger. Using the lower surface of the base plate 14 as the calibration trigger part 16 has a simple structure, does not require additional processing of the trigger structure, and reduces manufacturing costs.

[0037] In this embodiment, the drive mechanism 30 also includes a controller (not shown in the figure), such as a main control chip. The first trigger switch 101 and the correction trigger switch 102 are electrically connected to the controller. The controller controls the drive mechanism 30 to drive the pencil sharpening mechanism 10 through the connector 13 only when it simultaneously receives the first trigger signal generated by the first trigger switch 101 being triggered and the correction trigger signal generated by the correction trigger switch 102 being triggered.

[0038] In other embodiments, a circuit scheme can also be used to achieve similar functions. For example, the first trigger switch 101 and the correction trigger switch 102 are electrically connected in series, so that the drive mechanism 30 can only be activated when both are triggered simultaneously. However, the series circuit scheme can only implement simple "AND" logic. The first trigger switch 101 and the correction trigger switch 102 must be physically closed simultaneously to conduct the circuit, resulting in relatively simple functionality and limited expansion. In contrast, the controller scheme used in this embodiment achieves logical judgment through signal acquisition. In addition to the linkage of the two switches, it can further integrate intelligent functions such as delay judgment, fault diagnosis, and status indication. The switches only need to be connected to the controller via signal lines, making the layout flexible and facilitating subsequent function upgrades and program iterations. The system reliability and scalability are significantly better than the pure circuit scheme.

[0039] like Figure 3 , Figure 4 , Figure 6 , Figure 9 and Figure 10As shown, the drive mechanism 30 also includes a motor 35, a gear assembly 34, a main control board 36, and a battery 43. A first trigger switch 101 and a controller are mounted on the main control board 36. The main control board 36 is positioned below the gear assembly 34. A floating transmission assembly 31 passes through the gear assembly 34, connecting the upper connector 13 and the lower first trigger switch 101. When the motor 35 starts, it drives the gear assembly 34, which in turn drives the floating transmission assembly 31 to rotate. The drive interface 33 then drives the connector 13 to rotate, thereby driving the pencil sharpening mechanism 10.

[0040] The main control board 36 is positioned below the gear assembly 34, so that the first trigger switch 101 is located on the lower floating path of the floating transmission assembly 31, resulting in a compact structure and a short transmission chain. The trigger signal of the correction trigger switch 102 is transmitted to the main control board 36 through the wire 103, enabling the dual switch signals to be centrally processed and logically judged on the same main control board 36, simplifying circuit wiring and improving the reliability of signal transmission.

[0041] Since the main control board 36 is located below the gear assembly 34, and the calibration trigger switch 102 is located at the same horizontal position as the drive interface 33, the trigger signal of the calibration trigger switch 102 is transmitted to the plug 37 on the main control board 36 through the wire 103. Thus, the trigger signals of the first trigger switch 101 and the calibration trigger switch 102 establish an electrical connection with the controller through the circuit on the main control board 36. The controller only outputs a start signal when it simultaneously receives the first trigger signal generated by the first trigger switch 101 being triggered and the calibration trigger signal generated by the calibration trigger switch 102 being triggered. The controller then controls the start / stop and operation mode of the drive mechanism 30 through the control circuit on the main control board 36.

[0042] like Figure 3 , Figure 4 and Figure 9 As shown, the floating transmission assembly 31 includes a sleeve 32, which forms the drive interface 33. A circumferential limiting structure is provided between the sleeve 32 and the connector 13. The circumferential limiting structure can be a spline fit, a flat fit, or a non-circular cross-section fit to ensure that the sleeve 32 and the connector 13 can float axially relative to each other and rotate synchronously in the circumferential direction. The final stage gear of the gear assembly 34 is connected to the sleeve 32, and drives the connector 13 to rotate by driving the sleeve 32 to rotate.

[0043] The sleeve 32 serves as both the drive interface 33 for the connector 13 to connect to and the core component of the floating transmission assembly 31, achieving the dual functions of axial floating and circumferential transmission, resulting in a high degree of structural integration. Through circumferential limiting structures such as spline fit, flat fit, or irregular cross-section fit, it ensures that the sleeve 32 and the connector 13 can float axially relative to each other to adapt to the vertical displacement during the pencil sharpening process, and can also rotate synchronously in the circumferential direction to reliably transmit the cutting driving force, resulting in stable transmission and reliable fit.

[0044] like Figure 4 As shown, the electric pencil sharpener 200 provided in this embodiment is also equipped with a second trigger switch 103, which is mounted on the main control board 36. The floating transmission assembly 31 includes a sleeve 32, a trigger element 38, and a push rod 39. The upper opening of the sleeve 32 serves as a drive interface 33 connected to the connector 13 of the pencil sharpening mechanism 10. The lower side of the sleeve 32 is connected to the trigger element 38, and the lower end of the trigger element 38 is triggerably connected to the first trigger switch 101. The push rod 39 is disposed in the internal cavity of the sleeve 32. The upper end of the push rod 39 is connected to the connector 13 of the pencil sharpening mechanism 10, and the lower end is aligned with the second trigger switch 103 on the main control board 36, with a distance between them. When sharpening a pencil, the sharpening mechanism 10 descends, pushing the sleeve 32 and trigger 38 downwards to activate the first trigger switch 101. Simultaneously, the correction trigger 16 activates the correction trigger switch 102, the motor 35 is started in the forward direction, driving the gear assembly 34. This causes the sleeve 32 to rotate the connector 13, resulting in the rotating cutter assembly cutting the pencil. The pencil feeding mechanism 20 is driven synchronously, and the roller assembly feeds the pencil downwards. As the pencil continues to penetrate, the push rod 39 is pushed downwards, triggering the second trigger switch 103, causing the motor 35 to stop or start in the reverse direction. The sharpening mechanism 10 and the pencil feeding mechanism 20 are driven in the opposite direction, thus retracting the pencil.

[0045] Of course, in some embodiments, the first trigger switch and the second trigger switch are designed as a single switch to realize the functions of starting the motor in the forward direction and starting the motor in the reverse direction, which can also be applied in this invention.

[0046] like Figure 4 and Figure 5 As shown, the first separable unit 201 also includes a fixed frame 55 and a floating frame 53. The pen feeding mechanism 20 and the pen sharpening mechanism 10 are connected to the floating frame 53 to form a floating pen sharpening mechanism 104. The fixed frame 55 is fixedly connected to the upper housing 51. A plurality of return springs 54 are provided between the floating frame 53 and the fixed frame 55, and the elastic restoring force of the return springs 54 is used to return the floating frame 53 and the pen sharpening mechanism 10 upward.

[0047] When the connector 13 is aligned with and connected to the drive interface 33, the floating pencil sharpening mechanism 104 sinks and pushes the floating transmission component 31 to move down to trigger the first trigger switch 101, while the correction trigger part 16 triggers the correction trigger switch 102.

[0048] The fixed frame 55 is fixedly connected to the upper housing 51. The floating frame 53, the pencil sharpening mechanism 10 and the pencil feeding mechanism 20 form a floating pencil sharpening mechanism 104. A return spring 54 is set between the two, so that the pencil sharpening mechanism 10 can press down and sink when the pencil is inserted to trigger the switch. After the pencil is sharpened, it will automatically float up and return to its original position under the action of the return spring 54. The structure is simple and the operation is reliable. At the same time, the floating structure keeps the connector 13 and the drive interface 33 in elastic contact, which not only ensures the transmission cooperation but also allows axial floating, thus improving the smoothness of the pencil sharpening process.

[0049] like Figure 7 and Figure 8 As shown, the lower housing 61 is provided with a partition 62 to divide the lower housing 61 into a first cavity 63 with an upper opening and a second cavity 64 that houses the drive mechanism 30. In this embodiment, the first cavity 63 and the second cavity 64 are separated by the partition 62, so that the first cavity 63 can be used as a shavings collection bin. After the pencil is sharpened, the first separable unit 201 can be separated from the second separable unit 202, and the pencil shavings in the shavings collection bin can be emptied and cleaned. The lower housing 61 is also provided with a bottom cover 44 to close and open the second cavity 64, which facilitates the disassembly and assembly of the drive mechanism 30 and the replacement of the battery 43.

[0050] The partition 62 is provided with a first through hole 65, and a second through hole 66 is provided on the side of the first through hole 65. The drive interface 33 is exposed to the first cavity 63 through the first through hole 65, and the calibration trigger switch 102 is exposed to the first cavity 63 through the second through hole 66, so that the drive interface 33 and the calibration trigger switch 102 are at the same horizontal position.

[0051] The lower housing 61 is divided into a first cavity 63 and a second cavity 64 by a partition 62, which isolates the chip collection bin from the drive mechanism 30 and prevents pen chips from entering the drive mechanism 30 and causing contamination and malfunction. The drive interface 33 and the calibration trigger switch 102 are exposed in the same cavity and at the same horizontal position through the first through hole 65 and the second through hole 66, so that the connector 13 and the calibration trigger part 16 can be aligned with the drive interface 33 and the calibration trigger switch 102 respectively in the same assembly action, which simplifies the assembly alignment operation and improves the synchronization and accuracy of the anti-misoperation detection.

[0052] The lower side of the partition 62 is recessed with a first cavity 67 for accommodating at least a portion of the drive mechanism 30. The lower side of the partition 62 is also recessed with a second cavity 68 for accommodating the calibration trigger switch 102. A first through hole 65 is formed at the top of the first cavity 67. The outer periphery of the first through hole 65 has a hole wall 65a extending towards the first cavity 63, and the top surface of the hole wall 65a is at the same horizontal level as the calibration trigger switch 102. The calibration trigger switch 102 is installed in the second cavity 68, and a second through hole 66 is formed at the top of the second cavity 68.

[0053] By providing a first recess 67 and a second recess 68 on the lower side of the partition 62 to accommodate the drive mechanism 30 and the correction trigger switch 102 respectively, the upper surface of the partition 62 is kept flat, facilitating the cleaning of the chip collection bin. The top surface of the hole wall 65a and the correction trigger switch 102 are set at the same horizontal position, so that the contact state between the lower surface of the base plate 14 and the top surface of the hole wall 65a and the trigger state between the correction trigger part 16 and the correction trigger switch 102 form an interlocking relationship. When the connector 13 is aligned, the base plate 14 is fully in contact and the dual switches are triggered synchronously. When the connector 13 is tilted, the tilt of the base plate 14 and the failure of the correction trigger switch 102 to trigger occur synchronously. The detection logic corresponds completely to the mechanical state, and the judgment of preventing accidental touch is intuitive and reliable.

[0054] Here, the top surface of the hole wall 65a and the calibration trigger switch 102 are set at the same horizontal position. The purpose of this is that when the connector 13 is aligned with the drive interface 33 and connected to the drive interface 33, the lower surface of the base plate 14 abuts against the top surface of the hole wall 65a, and the calibration trigger part 16 triggers the calibration trigger switch 102. If the connector 13 fails to align with the drive interface 33 and instead deviates to the edge of the drive interface 33 or the top surface of the hole wall 65a, the lower surface of the base plate 14 cannot fully fit against the top surface of the hole wall 65a, and the calibration trigger part 16 cannot trigger the calibration trigger switch 102, thereby effectively preventing false triggering.

[0055] Furthermore, in this embodiment, the gear assembly 34 is centrally located within the gear mounting bracket 40 to provide a relatively enclosed operating environment for the gear assembly 34. The motor 35 is mounted on the underside of the base plate 41 of the gear mounting bracket 40, and the drive interface 33 protrudes from the top plate 42 of the gear mounting bracket 40. The shape of the first recess 67 matches the top plate 42, so that the top plate 42 is embedded into the first recess 67. This not only protects the gear assembly 34, motor 35, and main control board 36 from pen shavings contamination that could cause jamming or short circuits, but also enhances the stability of the drive mechanism 30 during operation and reduces vibration.

[0056] The following describes the dual-switch linkage anti-accidental touch method based on the dual-switch linkage anti-accidental touch device 100 provided in this embodiment, so as to dynamically explain the anti-accidental touch mechanism of the dual-switch linkage anti-accidental touch device 100 in actual use. Specifically, the controlled object of the dual-switch linkage anti-accidental touch method is the dual-switch linkage anti-accidental touch device 100, and includes the following steps: The controller receives a first trigger signal generated when the first trigger switch 101 is triggered; The controller determines whether it simultaneously receives a correction trigger signal triggered by the correction trigger switch 102; If not, wait for the calibration trigger signal from the calibration trigger switch 102; at this time, the controller will not send a motor start signal until the controller simultaneously receives the calibration trigger signal from the calibration trigger switch 102.

[0057] If so, the controller sends a start signal to the drive mechanism 30, that is, sends a positive start signal to the motor 35. The motor 35 starts in the positive direction to drive the gear assembly 34, which in turn drives the pencil sharpening mechanism 10 through the connector 13.

[0058] By controlling the controller to first receive the first trigger signal and then determine whether the correction trigger signal is received at the same time, the sequential detection and logical judgment of the dual switch states are realized, ensuring that the drive mechanism 30 is activated only when both switches are triggered at the same time. The control method has clear logic, accurate judgment, and is easy to further set intelligent functions such as delay judgment and fault diagnosis in the controller. The method has high scalability and reliability.

[0059] In this embodiment, the final gear of the gear assembly 34 drives the sleeve 32 to rotate the connector 13, thereby rotating the hobbing cutter assembly to cut the pencil. The pencil feeding mechanism 20 is driven synchronously, and the roller assembly feeds the pencil downwards. As the pencil continues to penetrate, the push rod 39 is pushed downwards, triggering the second trigger switch 103. The controller receives the second trigger signal generated by the triggering of the second trigger switch 103 and sends a stop and reverse start signal to the drive mechanism 30, that is, sends a stop and reverse start signal to the motor 35. The motor 35 stops and reverses to drive the gear assembly 34, so as to reverse drive the pencil sharpening mechanism 10 and the pencil feeding mechanism 20 through the connector 13, thereby retracting the pencil.

[0060] The following section, in conjunction with the assembly process of the electric pencil sharpener 200, further explains the anti-accidental touch principle of the dual-switch linkage anti-accidental touch device 100.

[0061] like Figure 3 and Figure 4 As shown, under normal use, the first separable unit 201 and the second separable unit 202 are assembled together, and the connector 13 is aligned with and connected to the drive interface 33. At this time, the pencil sharpening mechanism 10 sinks and pushes the floating transmission component 31 downward. The last gear of the gear assembly 34 moves downward synchronously and triggers the first trigger switch 101 once, generating a first trigger signal. At the same time, the correction trigger part 16 is aligned with and triggers the correction trigger switch 102, generating a correction trigger signal. The controller receives both the first trigger signal and the correction trigger signal, determines that the connector 13 is accurately aligned with and connected to the drive interface 33, controls the drive mechanism 30 to start, and the motor 35 drives the pencil sharpening mechanism 10 to operate through the gear assembly 34, the floating transmission component 31, and the connector 13.

[0062] By integrating the dual-switch linkage anti-accidental-touch device 100 into the first separable unit 201 and the second separable unit 202, the electric pencil sharpener 200 maintains its separable cleaning function while providing reliable anti-accidental-touch protection. The dual switches are triggered simultaneously only when the connector 13 and the drive interface 33 are accurately aligned and connected, and the drive mechanism 30 can be started. This effectively prevents the motor from starting accidentally due to tilting during reassembly, improving the overall safety performance and ease of use of the product.

[0063] like Figure 4 As shown, when the pencil is inserted into the pencil feeding channel, it continues to move downwards as automatic feeding and automatic cutting proceed. During this process, the connector 13 remains within the drive interface 33 for normal transmission, the correction trigger 16 continuously triggers the correction trigger switch 102, and both switches remain in a simultaneously triggered state, allowing the drive mechanism 30 to operate normally. This continues until the pencil pushes the push rod 39 downwards, triggering the second trigger switch 103. The controller receives the second trigger signal generated by the triggering of the second trigger switch 103 and sends a stop and reverse start signal to the drive mechanism 30, i.e., sends a stop and reverse start signal to the motor 35. The motor 35 stops and reverses to drive the gear assembly 34, which in turn drives the pencil sharpening mechanism 10 and the pencil feeding mechanism 20 in reverse via the connector 13, thereby retracting the pencil.

[0064] At this point, the first separable unit 201 and the second separable unit 202 are separated, and the shavings in the shavings collection chamber are emptied and cleaned. For example... Figure 2 As shown, during the process of reassembling the upper housing 51 after cleaning pen shavings, if the connector 13 is not accurately aligned with the drive interface 33 and is tilted, the end of the connector 13 may touch the edge of the drive interface 33 or the top surface of the hole wall 65a. At this time, although the floating transmission assembly 31 may be partially pressed down and trigger the first trigger switch 101, the tilt of the connector 13 causes the base plate 14 to tilt, preventing the correction trigger part 16 from aligning with the correction trigger switch 102, and the correction trigger switch 102 is not triggered. The controller only receives the first trigger signal and not the correction trigger signal, determining that the connector 13 is not accurately connected to the drive interface 33, and does not send a start signal to the drive mechanism 30. The motor 35 remains off, effectively preventing accidental motor start-up due to tilting during reassembly and eliminating safety hazards.

[0065] Only when the operator adjusts the position of the first separable unit 201, ensuring that the connector 13 is accurately aligned and fully connected to the drive interface 33, and the lower surface of the base plate 14 is fully in contact with the top surface of the hole wall 65a, and the calibration trigger unit 16 accurately triggers the calibration trigger switch 102, will the main control board 36 simultaneously receive the first trigger signal and the calibration trigger signal, and then control the drive mechanism 30 to start. This "dual-switch linkage" mechanism ensures that the motor is only triggered when the tool holder is aligned, fundamentally eliminating the risk of accidental triggering during the reassembly process.

[0066] In summary, the dual-switch linkage anti-accidental touch device, anti-accidental touch method, and electric pencil sharpener provided by this invention achieve at least the following three beneficial effects: First, the dual-switch linkage mechanism effectively prevents the motor from being accidentally triggered due to tilting during the reassembly of the floating tool holder.

[0067] This invention adds a calibration trigger switch at the same horizontal position as the drive interface. The calibration trigger part at the lower end of the pencil sharpening mechanism, in conjunction with the calibration trigger switch, forms a dual-switch linkage with the original first trigger switch. The drive mechanism can only drive the pencil sharpening mechanism through the connector when the connector is accurately aligned and connected to the drive interface, and when both the first trigger switch and the calibration trigger switch are triggered simultaneously. If, during reassembly, the connector is tilted and misaligned with the center of the drive interface, or shifts and presses against the edge of the drive interface, even if the floating transmission component is partially pressed down and the first trigger switch is mistakenly triggered, the calibration trigger switch remains in an untriggered state because the connector tilt prevents the calibration trigger part from aligning with it. This prevents the drive mechanism from starting, fundamentally eliminating the safety hazard of accidental motor start-up.

[0068] Second, reliable anti-accidental touch judgment is achieved through control logic, resulting in better system scalability.

[0069] The dual-switch linkage anti-misoperation method of this invention receives the first trigger signal generated by the first trigger switch being triggered by the controller, and determines whether a correction trigger signal is simultaneously received from the correction trigger switch. Only when both trigger signals are received simultaneously will a start signal be sent to the drive mechanism. If, during reassembly, tilting causes only the first trigger switch to be mistakenly triggered, the controller will not send a motor start signal until the correction trigger signal is received simultaneously, effectively preventing accidental motor start-up due to tilting during the reassembly of the floating tool holder. Furthermore, this control method uses a controller for signal acquisition and logic judgment. Compared to a simple series circuit scheme, it facilitates the further integration of intelligent functions such as delay judgment, fault diagnosis, and status indication. The system reliability and scalability are significantly better than a pure circuit scheme.

[0070] Third, without affecting the normal pencil sharpening function and the detachable cleaning function, improve the overall safety of electric pencil sharpeners.

[0071] This invention integrates the anti-accidental-touch function into the detachable structure of an electric pencil sharpener by setting a dual-switch linkage anti-accidental-touch device between a first and second detachable unit that can be separated from each other. When the first and second detachable units are assembled, the connector is aligned with the drive interface and connected to the drive interface. The calibration triggering unit triggers the calibration triggering switch, and both switches are triggered simultaneously, allowing the drive mechanism to start and operate normally without affecting the normal pencil sharpening function. After separating the first and second detachable units, the pencil shavings in the shavings collection bin can be emptied and cleaned without affecting the detachable cleaning function. During the process of reassembling the upper housing after cleaning, if the connector is not accurately aligned with the drive interface and tilts, even if the first triggering switch is accidentally triggered, the controller will not send a start signal because the calibration triggering switch is not triggered, and the motor remains in the off state. This effectively prevents the motor from accidentally starting due to improper operation during reassembly, significantly improving safety. Moreover, users do not need to pay special attention to alignment accuracy, resulting in a smooth and natural operating experience.

[0072] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0073] The foregoing has described the dual-switch linkage anti-accidental-touch device, anti-accidental-touch method, and electric pencil sharpener provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are merely for the purpose of helping to understand the present invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A dual-switch linkage anti-accidental touch device, characterized in that: Includes the pencil sharpening mechanism and the drive mechanism; The lower end of the pencil sharpening mechanism is provided with a connector, and a correction trigger part is provided around the connector; The drive mechanism has a floating transmission component; the upper end of the floating transmission component is provided with a drive interface for the connector to access, and a first trigger switch is provided on the floating path of the floating transmission component; A calibration trigger switch is provided at the same horizontal position as the drive interface, and the calibration trigger switch is located on the floating path of the calibration trigger part; When the connector is aligned with and connected to the drive interface, the pencil sharpening mechanism sinks down and pushes the floating transmission component to move down to trigger the first trigger switch, and at the same time the correction triggering part triggers the correction trigger switch. The drive mechanism can drive the pencil sharpening mechanism through the connector only when the first trigger switch and the correction trigger switch are triggered simultaneously.

2. The dual-switch linkage anti-accidental touch device according to claim 1, characterized in that: The pencil sharpening mechanism includes a tool assembly mounting bracket and a tool assembly; The tool assembly mounting bracket is provided with a base plate, and the base plate has a connection hole; the calibration trigger is located on the lower surface of the base plate and around the connection hole; The tool assembly is installed in the tool assembly mounting bracket, and the connector extends out of the tool assembly mounting bracket through the connecting hole to connect to the drive interface.

3. The dual-switch linkage anti-accidental touch device according to claim 1, characterized in that: The drive mechanism further includes a controller, and the first trigger switch and the correction trigger switch are respectively electrically connected to the controller; The controller controls the drive mechanism to drive the pencil sharpening mechanism through the connector only when it simultaneously receives a first trigger signal generated by the first trigger switch being triggered and a correction trigger signal generated by the correction trigger switch being triggered.

4. The dual-switch linkage anti-accidental touch device according to claim 3, characterized in that: The drive mechanism further includes a motor, a gear assembly, and a main control board; the first trigger switch and the controller are mounted on the main control board; The main control board is located below the gear assembly; the floating transmission assembly passes through the gear assembly and connects the upper connector and the lower first trigger switch; When the motor starts, it drives the gear assembly, which in turn drives the floating transmission assembly to rotate. The drive interface drives the connector to rotate, which in turn drives the pencil sharpening mechanism. The trigger signal of the calibration trigger switch is transmitted to the controller via a wire.

5. The dual-switch linkage anti-accidental touch device according to claim 4, characterized in that: The floating transmission assembly includes a sleeve, which constitutes the drive interface; A circumferential limiting structure is provided between the sleeve and the connector; The final gear of the gear assembly is connected to the sleeve, and the sleeve is driven to rotate, thereby driving the connector to rotate.

6. An electric pencil sharpener, characterized in that: It includes a first separable unit and a second separable unit that are separable from each other; The first separable unit includes an upper housing, a pen feeding mechanism, and the pen sharpening mechanism; The second separable unit includes a lower housing and a drive mechanism; It also includes the dual-switch linkage anti-accidental touch device as described in any one of claims 1-5; When the first separable unit and the second separable unit are assembled together, the connector is aligned with the drive interface and connected to the drive interface, and the calibration triggering part triggers the calibration triggering switch facing the drive interface.

7. The electric pencil sharpener according to claim 6, characterized in that: The lower housing is provided with a partition to divide the lower housing into a first cavity with an upper opening and a second cavity that accommodates the drive mechanism; The partition plate is provided with a first through hole, and a second through hole is provided on the side of the first through hole; The drive interface is exposed in the first cavity through the first through hole, and the calibration trigger switch is exposed in the second cavity through the second through hole, so that the drive interface and the calibration trigger switch are at the same horizontal position.

8. The electric pencil sharpener according to claim 7, characterized in that: The lower side of the partition is recessed with a first cavity for accommodating at least a portion of the drive mechanism; The lower side of the partition is recessed to accommodate the calibration trigger switch; The first through hole is formed at the top of the first cavity; the outer periphery of the first through hole is provided with a hole wall extending into the first cavity; the top surface of the hole wall is at the same horizontal position as the calibration trigger switch; The calibration trigger switch is installed in the second cavity, and the second through hole is opened at the top of the second cavity.

9. The electric pencil sharpener according to claim 6, characterized in that: The first separable unit further includes a fixed frame and a floating frame; The pen feeding mechanism and the pen sharpening mechanism are connected to the floating frame to form a floating pen sharpening mechanism; The fixing frame is fixedly connected to the upper housing; A plurality of return springs are provided between the floating frame and the fixed frame; When the connector is aligned with and connected to the drive interface, the floating pencil sharpening mechanism sinks and pushes the floating transmission component to move down to trigger the first trigger switch, and at the same time the correction triggering part triggers the correction trigger switch.

10. A method for preventing accidental touches by interlocking dual switches, characterized in that: Its controlled object is the dual-switch linkage anti-accidental touch device as described in any one of claims 1-5; Includes the following steps: Receive the first trigger signal generated when the first trigger switch is triggered; Determine whether a correction trigger signal is received simultaneously, indicating that the correction trigger switch has been triggered. If not, wait for a correction trigger signal from the correction trigger switch. If so, a start signal is sent to the drive mechanism to drive the pencil sharpening mechanism through the connector.

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