Electric pencil sharpening device

Abstract

The utility model discloses an electric pencil sharpening device which comprises a contact piece and a transmission piece. The transmission piece comprises an elastic structure and is in transmission connection with the contact piece; when a pencil is inserted into the electric pencil sharpening device, the pencil makes contact with the contact piece and enables the contact piece to generate displacement away from the pencil, the elastic structure generates deformation stress, and the on-off state of the switch can be switched through the deformation stress. After the pencil is pulled out of the electric pencil sharpening device, the elastic structure generates recovery stress, the recovery stress enables the transmission piece to recover the initial position before the pencil is inserted into the electric pencil sharpening device, and the switch recovers the on-off state before the pencil is inserted into the electric pencil sharpening device. The elastic structure is arranged on the transmission part, the switch can be pressed down after the pencil is inserted into the electric pencil sharpening device, the motor is started by switching the state of the switch, and the elastic structure is reset after the pencil is pulled out of the electric pencil sharpening device.

Description

Technical Field

[0001] This patent belongs to the field of stationery technology, specifically relating to an electric pencil sharpener. Background Technology

[0002] Electric pencil sharpeners are becoming increasingly common. They typically have a switch contact at the pencil inlet for activating the power switch. When a pencil is inserted, the pencil tip pushes the switch contact backward, which in turn activates the power switch and starts the sharpener. The power switch usually has a push-button travel. To accommodate pencils of different diameters, the pencil inlet contact also has a maximum and minimum travel. The push-button travel is generally less than the minimum travel of the push-button. To ensure the switch is activated at both the maximum and minimum travel positions, a spring mechanism is usually designed above the pencil inlet switch button to continuously press down on the button. The push-button's travel is greater than the button's activation travel. The excess travel causes the spring mechanism to deform, creating a force that keeps the button pressed down, preventing it from retracting and disconnecting the power, thus maintaining stable power supply.

[0003] The tail of a conventional pressure lever structure is typically rigid, while the corresponding start switch is a microswitch with a spring. The excess travel of the pressure lever beyond the button's activation stroke is absorbed by the deformation of the spring on the microswitch. These microswitches are generally expensive, and their connection to the PCB requires a wiring assembly with terminals. This assembly must be soldered to the switch before being assembled onto the PCB, resulting in poor stability and high cost.

[0004] With technological advancements and increased integration of manufacturing processes, tactile switches have gained wider application due to their low component costs and the stable performance and low cost resulting from integrated assembly processes. Using them in electric pencil sharpeners would significantly reduce product costs and greatly improve the sharpener's operational stability. However, tactile switches themselves lack a spring mechanism. Therefore, there is an urgent need for a reliable, simple, and low-cost elastic lever mechanism for tactile switches to address the current limitations of widespread use caused by the lack of a reliable elastic lever mechanism and to solve the technical problems of poor stability and high cost associated with conventional levers and elastic mechanisms. Utility Model Content

[0005] The purpose of this patent is to provide a low-cost switch spring lever mechanism applicable to switches, including tactile switches, in order to solve this technical problem:

[0006] This patent provides an electric pencil sharpening device, including: a switch, a motor, and a blade; the on / off state of the switch controls the motor to start or stop; when the motor is started, the blade can cut the pencil; the electric pencil sharpening device also includes: a contact element and a transmission element; the transmission element includes an elastic structure, and the transmission element is connected to the contact element in a transmission manner; when the pencil is inserted into the electric pencil sharpening device, the pencil contacts the contact element and causes the contact element to displace away from the pencil, the elastic structure generates deformation stress, and the on / off state of the switch can be switched through the deformation stress; after the pencil is pulled out of the electric pencil sharpening device, the elastic structure generates restoring stress, the restoring stress causes the transmission element to return to the initial position before the pencil was inserted into the electric pencil sharpening device, and the switch returns to the on / off state before the pencil was inserted into the electric pencil sharpening device.

[0007] Furthermore, when the pencil is inserted into the electric pencil sharpening device, the pencil contacts the contactor and causes the contactor to be displaced radially away from the pencil, while the reaction force generated by the switch on the transmission component is axially on the pencil.

[0008] Furthermore, the contact element includes a contact inclined surface, and the transmission element includes a transmission inclined surface. The contact inclined surface abuts against the transmission inclined surface so that when the contact element is displaced in the radial direction of the pencil, the transmission inclined surface is displaced in the axial direction of the pencil and the elastic structure is deformed.

[0009] Furthermore, the maximum displacement generated by the transmission inclined plane in the axial direction of the pencil is less than the displacement that would cause the deformation stress to damage the switch.

[0010] Furthermore, the transmission component includes a push rod and a switch lever, the push rod is connected to the switch lever in a transmission manner, the push rod abuts against the contact element, and the elastic structure is located on the switch lever.

[0011] Furthermore, it also includes a reset element, which is connected to the contact element so that the contact element can return to the initial position before the pencil was inserted into the electric pencil sharpener after the pencil is pulled out.

[0012] Furthermore, the reset element includes an elastic element, which is connected to the contact element in a transmission manner. When the contact element is displaced away from the pencil in the radial direction, the elastic element undergoes elastic deformation and generates a reset stress that facilitates the return of the contact element to its initial position before the pencil is inserted into the electric pencil sharpener.

[0013] Furthermore, the contact element includes an elastic guide rail, with the elastic element disposed inside the elastic guide rail.

[0014] Furthermore, it also includes an outer casing, a contact element and a transmission element installed inside the outer casing, and an elastic element with one end connected to the outer casing and the other end connected to the contact element.

[0015] Furthermore, the switch is a tactile switch. Attached Figure Description

[0016] The above content of this patent and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solution.

[0017] Figure 1 A three-dimensional schematic diagram of an uninserted pencil and an electric pencil sharpener;

[0018] Figure 2 for Figure 1 A frontal view diagram;

[0019] Figure 3 for Figure 2 Schematic diagram of the sectional view of section AA in the middle;

[0020] Figure 4 A three-dimensional schematic diagram of the contacts, transmission components, PCB board, and switches in an uninserted pencil and electric pencil sharpening device;

[0021] Figure 5 This is a cross-sectional view of the contacts, transmission components, PCB board, and switch in an uninserted pencil and electric pencil sharpening device.

[0022] Figure 6 A cross-sectional view of the contacts, transmission components, PCB board, and switch in an inserted pencil and electric pencil sharpening device;

[0023] Figure 7 This is a three-dimensional schematic diagram of the contact components in an electric pencil sharpener.

[0024] Figure 8 This is a cross-sectional schematic diagram of the contact components in an electric pencil sharpener;

[0025] Figure 9 A three-dimensional schematic diagram of the push rod in an electric pencil sharpener;

[0026] Figure 10 This is a cross-sectional schematic diagram of the push rod in an electric pencil sharpener;

[0027] Figure 11 A three-dimensional schematic diagram of the switch lever in an electric pencil sharpener;

[0028] Figure 12 This is a side view of the switch lever in an electric pencil sharpener.

[0029] Figure 13 This is a three-dimensional schematic diagram of the PCB board in an electric pencil sharpener.

[0030] Figure 14 This is a side view of the PCB board in an electric pencil sharpener.

[0031] Figure 15 This is a three-dimensional schematic diagram of the contacts, transmission components, PCB board, and switch in the comparative example;

[0032] Figure 16 This is a side view of the contact, transmission, and micro switch in the comparative example (facing the side of the micro switch spring).

[0033] Figure 17 This is a side view of the contact, transmission, and micro switch in the comparative example (facing the side of the micro switch spring).

[0034] Figure 18 This is a three-dimensional schematic diagram of the transmission components in the comparative example;

[0035] Figure 19 This is a side view of the micro switch in the comparative example (facing the side of the micro switch contact).

[0036] Figure 20 This is a 3D schematic diagram of the PCB board in the comparative example.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1: Pencil

[0039] 2: Blade Body

[0040] 3: Motor

[0041] 100, 100': Contact element

[0042] 110, 110': contact slope

[0043] 120, 120': Elastic element

[0044] 130: Flexible guide rail

[0045] 200, 200': Push rod

[0046] 210: Sloping surface of the push rod

[0047] 300, 300': Switch lever

[0048] 310: Elastic compression bar structure

[0049] 320': Rigid compression bar structure

[0050] 400, 400': PCB board

[0051] 410: Tactile switch

[0052] 401': Terminal block

[0053] 410': Micro switch

[0054] 411': Shrapnel

[0055] 412': Micro switch button

[0056] 411'a: Initial position of the shrapnel

[0057] 411'b: Location of the shrapnel under pressure

[0058] 420': Connecting cable

[0059] 500: Cover

[0060] 600: Outer shell

[0061] 700: Main Body Detailed Implementation

[0062] The detailed features and advantages of this patent are described below in the specific embodiments. The content is sufficient to enable any person skilled in the art to understand the technical content of this patent and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this patent.

[0063] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0064] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not indicate the only possible implementation. The terms "upper," "lower," etc., indicating orientation or positional relationships are defined with reference to the coordinates of the accompanying drawings and are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this patent. The terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0066] The terminology and expressions used herein are for descriptive purposes only and this patent should not be limited to these terms and expressions. The use of these terms and expressions does not imply the exclusion of any illustrative and descriptive equivalent features (or parts thereof), and it should be recognized that various possible modifications should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

[0067] Similarly, it should be noted that although this patent has been described with reference to the specific embodiments described above, those skilled in the art should recognize that the above embodiments are only used to illustrate this patent, and various equivalent changes or substitutions can be made without departing from the spirit of this patent. Therefore, any changes or modifications to the above embodiments within the essential spirit of this patent will fall within the scope of the claims of this patent.

[0068] Example

[0069] refer to Figures 1-14 This patent provides an embodiment of an electric pencil sharpener.

[0070] refer to Figures 1-3 This embodiment includes a switch, a motor 3, and a blade 2. The on / off state of the switch controls the motor to start or stop. When the motor 3 is started, the blade 2 can cut the pencil 1. In addition, the electric pencil sharpener also includes a cover 500, an outer shell 600, and a main body 700. The cover 500 and the outer shell 600 are detachably connected. The main body 700 is relatively fixedly disposed inside the outer shell 600. The blade 2 and the motor 3 are both fixed to the main body 700. The cover 500 has an insertion part for inserting the pencil 1.

[0071] like Figure 3 The electric pencil sharpening device also includes a contact element 100 and a transmission element. The transmission element includes an elastic structure and is connected to the contact element 100. When the pencil 1 is inserted into the electric pencil sharpening device, the pencil contacts the contact element 100, causing the contact element 100 to displace away from the pencil 1. The elastic structure generates deformation stress, which can switch the on / off state of the switch. After the pencil is removed from the electric pencil sharpening device, the elastic structure generates restoring stress, which causes the transmission element to return to its initial position before the pencil 1 was inserted into the electric pencil sharpening device, and the switch returns to its on / off state before the pencil 1 was inserted into the electric pencil sharpening device. The transmission element is disposed between the outer shell 600 and the main body 700. A guide is provided between the outer shell 600 and the main body 700 to ensure that the transmission element can move primarily along the axial direction of the pencil 1. It is also easy to understand that the transmission element can swing to avoid jamming.

[0072] Specifically, refer to Figures 4-8The contact element 100 includes a contact inclined surface 110, the transmission element includes a transmission inclined surface, the transmission element includes a push rod 200 and a switch rod 300, the push rod 200 and the switch rod 300 are connected in a transmission manner, the push rod 200 abuts against the contact element 300, the transmission inclined surface is located on the push rod 200, and the elastic structure is located on the switch rod 300.

[0073] Figure 5 , 6 The states of the contact 100, push rod 200 and switch lever 300 before and after the pencil 1 is inserted are shown respectively. It can be seen that after the pencil 1 is inserted (downward in the figure), the contact 100 is displaced in the radial direction of the pencil 1 (to the right in the figure). The transmission ramp drives the transmission components, namely the push rod 200 and the switch lever 300, to be displaced in the axial direction of the pencil 1 (downward in the figure), and the elastic structure is deformed.

[0074] Preferably, the maximum displacement generated by the transmission inclined plane in the axial direction of the pencil is less than the displacement that would cause deformation stress to damage the switch.

[0075] More specifically, the transmission ramp is a push rod ramp 210, which abuts against the contact ramp 110. When the pencil 1 is inserted into the electric pencil sharpener, the pencil 1 contacts the contact member 100, causing the contact member 100 to displace radially away from the pencil 1. The push rod ramp 210 slides relative to the contact ramp 110, and the push rod ramp 210 displaces axially away from the contact member 100. The push rod 200 abuts against the switch lever 300. When the push rod ramp 210 displaces axially away from the contact member 100, the push rod 200 as a whole also displaces radially away from the contact member 100. The contact surface between the push rod 200 and the switch lever 300 also displaces radially away from the contact member 100. The elastic lever structure 310, which abuts against the switch, generates deformation stress, which causes the switch to switch on / off states.

[0076] refer to Figure 6 When the contact slope 110 abuts against the transmission slope, so that when the contact member 100 is displaced in the radial direction of the pencil 1, the transmission slope is displaced in the axial direction of the pencil 1 and the elastic pressure bar structure 310 is deformed.

[0077] This embodiment also includes a reset member, which is connected to the contact member so that the contact member can return to the initial position before the pencil was inserted into the electric pencil sharpener after the pencil is pulled out.

[0078] Specifically, the reset element includes an elastic element 120, which is kinetically connected to the contact element 100. When the contact element 100 is displaced radially away from the pencil 1, the elastic element 120 undergoes elastic deformation and generates a reset stress that facilitates the return of the contact element 100 to its initial position before the pencil 1 is inserted into the electric pencil sharpener. It is easy to understand that a typical elastic element 120 includes a spring.

[0079] Preferably, refer to Figure 7 The contact element 100 includes an elastic guide rail 130, and an elastic element 120 is disposed inside the elastic guide rail 130. The elastic guide rail 130 can constrain the deformation of the elastic element 120 and prevent the elastic element 120 from becoming unstable due to the unstable action of inserting the pencil 1. Figure 8 The contact ramp 110 is shown.

[0080] Specifically, returning to the reference Figure 3 One end of the elastic element 120 is connected to the cover 500, and the other end is connected to the contact element 100. The elastic element 120 can provide assistance to reset the contact element 100, which facilitates the reset of the transmission element. The reset element can prevent the push rod inclined surface 210 and the contact inclined surface 110 from being in a dead point state due to insufficient recovery stress of the elastic structure being less than the static friction force between the push rod inclined surface 210 and the contact inclined surface 110.

[0081] refer to Figure 9-10 The push rod inclined surface 210 is located at the end of the push rod 200. The push rod inclined surface and the other three planes together form a ring structure. In addition to abutting and transmitting with the contact inclined surface 110, the ring structure can also limit the contact member 100 to prevent the contact inclined surface 110 from sliding out from the side of the push rod 200, which would cause the contact inclined surface 110 to fail to abut the push rod inclined surface 210 and thus fail.

[0082] More specifically, such as Figure 10 The projection length of the inclined plane 210 of the push rod onto the axis of the pencil 1 is A, which is also the maximum travel of the push rod 200; for example Figure 14 The travel distance of the tactile switch 410 after being pressed is B. The relationship between the maximum travel distance A of the push rod 200 and the travel distance B of the tactile switch 410 after being pressed is: A>B.

[0083] refer to Figures 11-12 The switch lever 300 includes an elastic structure, namely a hook-shaped elastic lever structure 310. The head of the switch lever 300 can move downward after being pressed by the tail of the push rod 200. Its tail is designed with a section of elastic lever structure 310, which is a slender hook-shaped structure that is thinner at the front and gradually thicker at the back.

[0084] Preferably, the elastic yield pressure of the elastic lever structure 310 needs to be greater than the pressure required to turn on the tactile switch 410, that is, the elastic lever structure 310 hardly undergoes elastic deformation when pushing the tactile switch 410 to move. It is understood that those skilled in the art are capable of adjusting the elastic yield pressure of the elastic lever structure 310, for example, by adjusting the cross-sectional thickness of the elastic lever structure 310.

[0085] With the elastic lever structure 310 set in this way, when the tactile switch 410 is pushed to its on position, it will basically stop moving. At this time, the upper part of the lever 200 continues to move downward, which will push the elastic lever structure 310 to produce yield deformation. Even if the strain is large, the stress generated will be small, which can keep pressing the tactile switch 410 and keep the tactile switch 410 in the on state.

[0086] Understandably, the switch lever 300 can be made of common materials with suitable elastic modulus, such as polyoxymethylene plastic and polycarbonate plastic.

[0087] Polyoxymethylene (POM), also known as polyoxymethylene, acetal resin, polyoxymethylene, or polyacetal, is a thermoplastic crystalline polymer, often referred to as "super steel" or "acetal".

[0088] Polycarbonate (PC) is a high-molecular-weight polymer containing carbonate groups in its molecular chain. Based on the structure of the ester groups, it can be classified into various types, including aliphatic, aromatic, and aliphatic-aromatic. It is a strong and tough thermoplastic resin, its name derived from the -OC(=O)-O- groups within it. It can be synthesized from bisphenol A and carbonyl chloride (COCl2). Currently, the most commonly used method is the melt transesterification process.

[0089] Common materials with suitable elastic moduli, including polyoxymethylene (POM) and polycarbonate (PC), are not only easy to process and mold, but also very low in cost.

[0090] For example, in this embodiment, the switch is open when it is not pressed, and the motor 3 stops. When the deformation stress generated by the elastic pressure rod structure 310 is sufficient to make the switch reach the opening point, the switch is open, the motor 3 rotates, and drives the blade 2 to rotate to cut the pencil 1.

[0091] refer to Figures 13-14In this embodiment, the switch is a tactile switch 410. When pressure is applied in the direction of operation to meet the operating force, the switch is closed and connected. When the pressure is released, the switch is open. The reaction force generated by the tactile switch 410 on the transmission component is along the axis of the pencil. When the pencil 1 is pulled out of the electric pencil sharpener, since the contact 100 no longer contacts the pencil 1, the contact 100 is no longer subjected to a force away from the pencil 1. The inclined surface 210 of the push rod no longer tends to move away from the contact 100 along the axis of the pencil 1. The push rod 200 as a whole no longer tends to move away from the contact 100 along the axis of the pencil 1. At this time, the elastic pressure rod structure 310 generates restoring stress, causing the switch pressure rod 300 and the push rod 200 to restore the transmission component to its initial position before the pencil 1 was inserted into the electric pencil sharpener, that is, to generate a displacement closer to the contact 100 in the insertion direction of the pencil 1. Simultaneously, since the deformation stress of the elastic pressure rod structure 310 is insufficient to reach the operating force of the switch, the switch also returns to the on / off state before the pencil 1 was inserted into the electric pencil sharpener.

[0092] In addition, the tactile switch 410 can be directly mounted on the PCB board 400 without the need for conductive wires, resulting in lower costs and better stability as it will not fail due to broken or aged conductive wires.

[0093] Comparative Example

[0094] refer to Figures 15-20 A comparative example of an electric pencil sharpening device includes: a contact 100', a contact slope 110', and an elastic element 120' that are substantially the same as those in the embodiment, and a push rod 200' that is substantially the same as those in the embodiment. When a pencil 1 is inserted into the comparative example, the movement of the contact 100', the contact slope 110', and the elastic element 120' is also substantially the same as the movement of the contact 100, the contact slope 110, and the elastic element 120 in the embodiment.

[0095] refer to Figures 15-17 The differences between the comparative example and the embodiment include:

[0096] The switch is a micro switch 410' rather than a tactile switch 410, and the micro switch includes a spring 411'.

[0097] The push rod 300', which is connected to the push rod 200' in a transmission manner, does not have an elastic structure, but rather has a structure like... Figure 18 The rigid compression bar structure 320' shown is illustrated.

[0098] like Figure 19 The micro switch 410' includes a micro switch button 412' and a spring 411' having an initial spring position 411'a and a pressed spring position 411'b.

[0099] Before pencil 1 is inserted into the comparative example, the spring piece 411' is in the initial position 411'a. When pencil 1 is inserted into the comparative example, the rigid pressure rod structure 320' presses the spring piece until the spring piece 411' is in the compressed position 411'b, after which the micro switch 410' switches states. The difference in position between the end of the spring piece 411' in the initial position 411'a and the compressed position 411'b is projected onto the axial length of pencil 1 by a length equivalent to B. Similar to the embodiment, the relationship between the maximum travel A and B of the push rod 200' is: A>B.

[0100] like Figure 20 The PCB board 400' includes a terminal block 401', and the micro switch 410' is connected to the terminal block 401' via a connecting wire 420'.

[0101] It can be seen that the advantage of the embodiment compared to the comparative example is that it does not require the installation of terminal block 401', connecting wire 420' and micro switch 410', but achieves similar functions and has higher reliability by using a lower cost tactile switch 410 and elastic lever structure 310.

[0102] The terminology and expressions used herein are for descriptive purposes only and this patent should not be limited to these terms and expressions. The use of these terms and expressions does not imply the exclusion of any illustrative and descriptive equivalent features (or parts thereof), and it should be recognized that various possible modifications should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

[0103] Similarly, it should be noted that although this patent has been described with reference to the specific embodiments described above, those skilled in the art should recognize that the above embodiments are only used to illustrate this patent, and various equivalent changes or substitutions can be made without departing from the spirit of this patent. Therefore, any changes or modifications to the above embodiments within the essential spirit of this patent will fall within the scope of the claims of this patent.

Claims

1. An electric pencil sharpener comprising: The switch, the motor and the cutter body; The on-off state of the switch controls the start or stop of the motor, and when the motor is started, the cutter body can cut a pencil, characterized in that the electric pencil sharpener further comprises a contact member and a transmission member; the transmission member comprises an elastic structure, and the transmission member is in transmission connection with the contact member; When a pencil is inserted into the electric pencil sharpener, the pencil contacts the contact member and causes the contact member to produce displacement away from the pencil, and the elastic structure produces a deformation stress and can switch the on-off state of the switch through the deformation stress; After the pencil is pulled out of the electric pencil sharpener, the elastic structure produces a recovery stress, the recovery stress causes the transmission member to restore the initial position before the pencil is inserted into the electric pencil sharpener, and the switch restores the on-off state before the pencil is inserted into the electric pencil sharpener.

2. The electric pencil sharpener of claim 1, wherein When a pencil is inserted into the electric pencil sharpener, the pencil contacts the contact member and causes the contact member to produce displacement away from the pencil in the radial direction of the pencil, and the reaction force of the transmission member on the switch is in the axial direction of the pencil.

3. The electric pencil sharpener of claim 2, wherein The contact member comprises a contact inclined surface, the transmission member comprises a transmission inclined surface, and the contact inclined surface abuts against the transmission inclined surface, so that when the contact member produces displacement in the radial direction of the pencil, the transmission inclined surface produces displacement in the axial direction of the pencil and the elastic structure produces deformation.

4. The electric pencil sharpener according to claim 3, wherein The maximum displacement of the transmission inclined surface in the axial direction of the pencil is less than the displacement at which the deformation stress damages the switch.

5. The electric pencil sharpener of claim 1, wherein The transmission member comprises a push rod and a switch pressing rod, the push rod is in transmission connection with the switch pressing rod, the push rod abuts against the contact member, and the elastic structure is located at the switch pressing rod.

6. The electric pencil sharpener of claim 1, wherein, Further comprising a reset member in transmission connection with the contact member, so that after the pencil is pulled out of the electric pencil sharpener, the contact member can restore the initial position before the pencil is inserted into the electric pencil sharpener.

7. The electric pencil sharpener of claim 6 wherein, The reset member comprises an elastic member in transmission connection with the contact member, and when the contact member produces displacement away from the pencil in the radial direction of the pencil, the elastic member elastically deforms and produces a reset stress to facilitate the restoration of the contact member to the initial position before the pencil is inserted into the electric pencil sharpener.

8. The electric pencil sharpener of claim 7 wherein, The contact member comprises an elastic member guide rail, and the elastic member is arranged inside the elastic member guide rail.

9. The electric pencil sharpener of claim 7 wherein, Further comprising an outer housing, the contact member and the transmission member are installed inside the outer housing, one end of the elastic member is connected with the outer housing, and the other end is connected with the contact member.

10. The electric pencil sharpener according to any one of claims 1 to 9, characterized in that The switch is a micro switch.

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