Electric pencil sharpening device

Abstract

The utility model discloses an electric pencil sharpening device which comprises a switch, a motor and a knife body. The electric pencil sharpening device comprises a knife body, a switch, a motor, a cover body, a contact piece and a transmission piece, the cover body comprises a rail piece, the rail piece is used for forming a guide rail, and the contact piece is arranged in the guide rail; 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 move in the guide rail, and the transmission piece switches the on-off state of the switch. The cost of the electric pencil sharpener can be reduced.

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 range. To accommodate pencils of different diameters, the pencil inlet contact also has maximum and minimum travel ranges. The push-button travel range is generally less than the minimum travel range of the push-button. To ensure the switch is activated at both the maximum and minimum travel ranges, a spring mechanism is usually designed above the pencil inlet switch button to continuously press down on the button. The push-button's travel range is greater than the button's activation travel range. 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 conventional guide rail structure of existing switch contacts typically consists of a bottom surface and left / right sides designed on the pen-inlet contact holder, with a pen-inlet contact cover plate on top. The bottom surface of the cover plate, together with the bottom surface and left / right sides of the guide rail on the pen-inlet contact holder, forms a guide rail that restricts the vertical, horizontal, leftward, and rightward movement of the switch contact, allowing it to move only longitudinally within the guide rail. This structure requires at least two parts to form a complete guide rail, resulting in high material and manufacturing costs. Furthermore, each additional part adds an assembly structure and assembly process, increasing production costs. Assembly introduces assembly errors, which require reducing part tolerances to eliminate, further increasing quality costs. This leads to the current high overall cost of electric pencil sharpeners, hindering their widespread adoption and use.

[0004] Therefore, the question is how to provide a guide rail structure that is simple in structure and assembly, has fewer parts, is low in cost, and is stable and reliable in operation, so as to solve the technical problems of complex structure and assembly, many parts, and high cost of the current electric pencil sharpener switch contact guide rail. Utility Model Content

[0005] The purpose of this patent is at least to reduce the cost of electric pencil sharpeners. To solve this technical problem, this patent adopts the following technical solution:

[0006] An electric pencil sharpening device includes: 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 pencils; the electric pencil sharpening device also includes: a cover, a contact, and a transmission component; the cover includes a track component for forming a guide track, and the contact component is disposed within the guide track; when a pencil is inserted into the electric pencil sharpening device, the pencil contacts the contact component, causing the contact component to move within the guide track, and causing the transmission component to switch the on / off state of the switch.

[0007] Furthermore, the guide rail includes a top wall, side walls, and bottom wall, and the contact element simultaneously contacts the top wall, side walls, and bottom wall.

[0008] Furthermore, the inner wall of the cover forms the top wall of the track; the track components form the side walls and bottom wall of the track.

[0009] Furthermore, the track component includes a bent portion, the side of which near the cover is used to form the bottom wall of the track.

[0010] Furthermore, the side of the bend away from the cover is used to form a guide surface that facilitates the assembly of the contact element into the guide rail.

[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, the track component includes at least one set of track posts arranged in pairs.

[0015] Furthermore, the track components are integrally formed with the cover.

[0016] Furthermore, the track components are made of soft, elastic rubber material.

[0017] The advantages of this application compared to existing technologies are as follows:

[0018] By incorporating guide rail components on the cover of the electric pencil sharpener, the four sides (top, bottom, left, and right) that would require two parts to form a complete guide rail structure in a conventional design are structurally optimized and integrated onto the cover, facilitating one-piece molding during production. This not only saves on the material and processing costs of fastening the cover in a conventional structure but also reduces assembly costs and quality costs associated with ensuring assembly accuracy.

[0019] The proposed structural design is reasonable, and can fully contact the contact components while minimizing structural costs, ensuring the movement accuracy of the contact components, facilitating contact component assembly, and providing both ease of processing and reliability and ease of use.

[0020] The principle and structure of this patent are simple, low in cost, stable and reliable, and effectively solve the technical problems of complex structure and assembly, many parts and high cost of the switch contact rail of the current electric pencil sharpener. Attached Figure Description

[0021] The above description of this utility model and the following detailed embodiments will provide a better understanding when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solution.

[0022] 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.

[0023] Figure 1 A three-dimensional schematic diagram of an uninserted pencil and an electric pencil sharpener;

[0024] Figure 2 for Figure 1 A frontal view diagram;

[0025] Figure 3 for Figure 2 A cross-sectional view;

[0026] 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;

[0027] 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.

[0028] Figure 6 A cross-sectional view of the contacts, transmission components, PCB board, and switch in an inserted pencil and electric pencil sharpening device;

[0029] Figure 7a A three-dimensional schematic diagram of the cover in an electric pencil sharpener;

[0030] Figure 7b A three-dimensional schematic diagram of the cover of an electric pencil sharpener from another perspective;

[0031] Figure 8a for Figure 7a A three-dimensional diagram of the cover after the contact element is inserted, with the contact element protruding, corresponding to the state when the pencil is not inserted into the electric pencil sharpener.

[0032] Figure 8b for Figure 7b A three-dimensional diagram of the cover after the contact element is inserted, with the contact element protruding, corresponding to the state when the pencil is not inserted into the electric pencil sharpener.

[0033] Figure 9a for Figure 7a A three-dimensional diagram of the cover after the contact element is installed, with the contact element in a retracted state, corresponding to the state after a pencil is inserted into an electric pencil sharpener.

[0034] Figure 9b Figure 7a A three-dimensional diagram of the cover after the contact element is installed, with the contact element in a retracted state, corresponding to the state after a pencil is inserted into an electric pencil sharpener.

[0035] Figure 10a A three-dimensional schematic diagram of the guide rail in an electric pencil sharpener;

[0036] Figure 10b A three-dimensional schematic diagram of the guide rail in an electric pencil sharpener from another perspective;

[0037] Figure 11a This is a side view of the cover of an electric pencil sharpener, along its length towards the guide rail.

[0038] Figure 11b This is a side view of the cover of an electric pencil sharpener, perpendicular to the length of the guide rail.

[0039] Figure 12a for Figure 11a A cross-sectional view at point AA, showing that no contact components are installed inside the cover. Figure 7a , denoted as A-A1;

[0040] Figure 12b for Figure 11b A cross-sectional view of section BB, showing that no contact parts are installed inside the cover. Figure 7b This is denoted as B-B1;

[0041] Figure 12c for Figure 11b A cross-sectional view at point CC, showing that no contact components are installed inside the cover. Figure 7b, denoted as C-C1;

[0042] Figure 13a for Figure 11a A cross-sectional view at point AA, showing the location of the contact element inside the cover as shown below. Figure 8a , denoted as A-A2;

[0043] Figure 13b for Figure 11b A cross-sectional view of section BB, showing the positions of the contact parts inside the cover as follows. Figure 8b This is denoted as B-B2;

[0044] Figure 13c for Figure 11b A cross-sectional view at point CC, showing the positions of the contact parts inside the cover as shown below. Figure 8b , denoted as C-C2;

[0045] Figure 14a for Figure 11a A cross-sectional view at point AA, showing the location of the contact element inside the cover as shown below. Figure 9a , denoted as A-A3;

[0046] Figure 14b for Figure 11b A cross-sectional view of section BB, showing the positions of the contact parts inside the cover as follows. Figure 9b This is denoted as B-B3;

[0047] Figure 14c for Figure 11b A cross-sectional view at point CC, showing the positions of the contact parts inside the cover as shown below. Figure 9b , denoted as C-C3;

[0048] Figure 15 This is a three-dimensional schematic diagram of the contact components in an electric pencil sharpener.

[0049] Figure 16a Schematic diagram of the assembly of the cover in an electric pencil sharpener Figure 1 This shows assembly step one;

[0050] Figure 16b Schematic diagram of the assembly of the cover in an electric pencil sharpener Figure 2 This shows assembly step two;

[0051] Figure 16c Schematic diagram of the assembly of the cover in an electric pencil sharpener Figure 3 This shows assembly step three;

[0052] Figure 17 A three-dimensional schematic diagram of an electric pencil sharpener;

[0053] Figure 18 This is a sectional view of an electric pencil sharpener.

[0054] Figure 19 An exploded diagram of an electric pencil sharpener (scale comparison).

[0055] Figure 20 for Figure 19 A cross-sectional view.

[0056] Explanation of reference numerals in the attached figures:

[0057] 1: Pencil

[0058] 2: Blade Body

[0059] 3: Motor

[0060] 100: Contact element

[0061] 110: Contact slope

[0062] 120: Elastic element

[0063] 130: Flexible guide rail

[0064] 200: Push rod

[0065] 210: Sloping surface of the push rod

[0066] 300: Switch lever

[0067] 310: Elastic compression bar structure

[0068] 400: PCB board

[0069] 410: Switch

[0070] 500: Cover

[0071] 51: Guide rail

[0072] 510: Track column

[0073] 511: Track sidewall

[0074] 512: Bottom wall of the track

[0075] 513: Guiding Surface

[0076] 501: Track top wall

[0077] 520: Entering the Department

[0078] 530: Barrier Post

[0079] 600: Outer shell

[0080] 700: Main Body

[0081] 1501: Top Cover

[0082] 1502: Bottom Cover

[0083] 1100: Comparison of contact components

[0084] 1101: Compare the sidewalls of the contact components

[0085] 1102: Compare the top wall of the contact element

[0086] 1103: Compare the bottom wall of the contact component Detailed Implementation

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] Example

[0094] refer to Figures 1-1 4. This patent provides an embodiment of an electric pencil sharpening device.

[0095] refer to Figures 1-3 This embodiment includes a switch 410, a motor 3, and a blade 2. The on / off state of the switch 410 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 520 for inserting the pencil 1.

[0096] 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 410. 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 410 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 guiding structure is provided between the outer shell 600 and the main body 700 so that the transmission element can move primarily in the axial direction of the pencil 1. It is also easy to understand that the transmission element can also swing to avoid jamming.

[0097] Specifically, refer to Figure 4~8, the contact 100 includes a contact inclined surface 110, the transmission component includes a transmission inclined surface, the transmission component includes a push rod 200 and a switch lever 300, the push rod 200 and the switch lever 300 are connected in a transmission manner, the push rod 200 abuts against the contact 100, the transmission inclined surface is located on the push rod 200, and the elastic structure is located on the switch lever 300.

[0098] 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.

[0099] The cover 500 includes a track component that forms a guide track 51, and a contact component 100 is disposed within the guide track 51. When the pencil 1 is inserted into the electric pencil sharpener, the pencil 1 contacts the contact component 100, causing the contact component to move within the guide track 51 and switching the on / off state of the transmission component switch 410. The guide track 51 includes a top wall 501, a side wall 511, and a bottom wall 512.

[0100] Specifically, such as Figure 7a , Figure 7b The track component includes two pairs of track posts 510. The inner wall of the cover 500 forms the top wall 501 of the track, and the side wall of the track post 510 near the contact member 100 forms the side wall 511 of the track. The track post 510 also includes a bent portion. The side of the bent portion near the cover 500 forms the bottom wall 512 of the track, and the side of the bent portion away from the cover 500 forms a guide surface 513 to facilitate the assembly of the contact member 100 into the guide track 51. It is easy to understand that the side of the cover 500 near the main body 700 is the inner side, and the top wall 501 of the track can also be formed by the track component.

[0101] Figure 8a , Figure 8b , Figure 9a and Figure 9b The two states of the contact 100 within the guide rail 51 are shown, wherein, Figure 8a , Figure 8b correspond Figure 5 In the state of insertion, the contact 100 partially or completely blocks the entry part 520 before the pencil 1 is inserted. Figure 9a and Figure 9b correspond Figure 6In the state of insertion, after the pencil 1 is inserted, it pushes the contact 100 away from the entry part 520 within the guide rail 51. Due to the limiting and guiding effect of the guide rail 51, the contact 100 can only be displaced in the radial direction of the pencil 1, which restricts the degree of freedom of the contact 100 and makes the transmission motion between the contact 100 and the transmission component more deterministic.

[0102] Figure 10a , 10b The inner wall of the cover 500 is shown to form the top wall 501 of the track, and the track post 510 is shown to form the side wall 511 and the bottom wall 512 of the track.

[0103] Figure 11a , 11b The diagram shows two side views of the cover 500, in which... Figure 11a The perspective is along the length of guide track 51. Figure 11b This is a viewpoint perpendicular to the length direction of guide rail 51. Based on Figure 11a , 11b The cutting symbols A, B, and C in the diagram correspond to the cover 500 without the contact element 100 installed, respectively. Figure 5 Contact element 100 and cover 500 in state, corresponding Figure 6 By taking three sets of sectional views of the contact element 100 and the cover 500 in the state, we can obtain... Figure 12a , 12b , 12c, 13a, 13b, 13c, 14a, 14b, 14c.

[0104] refer to Figure 12a , 12b In this embodiment, the dimensions of the guide rail 51 are adapted to the contact member 100, and the contact member 100 simultaneously contacts the top wall 501, the side wall 511, and the bottom wall 512 of the rail. It is understood that in some implementation scenarios where the motion accuracy requirements of the contact member 100 are slightly lower, an acceptable gap may exist between the contact member 100 and the top wall 501, side wall 511, and bottom wall 512 of the rail. As long as the contact member 100 has an acceptable and relatively definite motion trajectory within the guide rail 51, the function of the contact member 100 can be achieved. In this embodiment, the motion trajectory of the contact member 100 within the guide rail 51 is relatively definite, i.e. Figure 14a The left and right movement is shown in the image.

[0105] 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 1 was inserted into the electric pencil sharpener after the pencil is pulled out. The cover 500 also includes a stop post 530, which is used to limit the movement of the contact member 100 toward the inlet 520 so that it does not exceed the initial position before the pencil 1 was inserted into the electric pencil sharpener.

[0106] 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.

[0107] In this embodiment, when the electric pencil sharpening device is not in use, that is, when the pencil 1 is not inserted, the contact member 100 is pressed against the blocking post 530 by the elastic member 120.

[0108] In this embodiment, reference Figure 15 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.

[0109] In this embodiment, the track post 510 is made of soft elastic material, such as common materials with a suitable elastic coefficient, such as polyoxymethylene plastic, polycarbonate plastic, etc.

[0110] Polyoxymethylene (POM), also known as polyoxymethylene, acetal resin, polyoxymethylene, or polyacetal, is a thermoplastic crystalline polymer, often referred to as "super steel" or "acetal".

[0111] 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.

[0112] 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.

[0113] It is easy to understand that in this embodiment, the track post 510 and the cover 500 are integrally formed, and the cover 500 and the track post 510 have the same material.

[0114] 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 the deformation stress to damage the switch 410.

[0115] 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 410, generates deformation stress, which causes the switch 410 to switch between on and off states.

[0116] 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.

[0117] For example, in this embodiment, when the switch 410 is not pressed, it is an open circuit and the motor 3 stops. When the deformation stress generated by the elastic pressure rod structure 310 is sufficient to make the pressing stroke of the switch 410 reach the opening point, the switch 410 becomes an open circuit, the motor 3 rotates, and drives the blade body 2 to rotate to cut the pencil 1.

[0118] Assembly of contact 100

[0119] Figure 16a , 16b Figures 16c show the assembly process of contact 100.

[0120] like Figure 16a The first step is to place the two sides of the top surface of the contact member 100 against the guide surface 513 on the track column 510.

[0121] like Figure 16bStep two involves pushing the contact 100 toward the cover 500. Under the reaction force of the guide surface 513, the track column 510 undergoes outward elastic deformation, and the contact 100 slides into the inside of the bend along the guide surface 513.

[0122] like Figure 16c Step three involves continuing to push the contact 100 upwards until the track post 510 returns to its original position under the action of the spring force. At this point, the bottom wall 512 of the track rests against the lower surface of the contact 100, completing the assembly.

[0123] Comparative Example

[0124] refer to Figures 17-20 This patent provides a comparative example of an electric pencil sharpener, which is basically the same as the embodiment, except that the electric pencil sharpener in the comparative example does not have a cover 500, but includes an upper cover 1501 and a lower cover 1502 that can be closed to each other.

[0125] The comparative contact 1100 in the comparative example has the same function as the contact 100 in the embodiment. The comparative contact 1100 is assembled between the upper cover 1501 and the lower cover 1502. The top wall 1102 of the comparative contact abuts against the upper cover 1501, and the side wall 1101 and the bottom wall 1103 of the comparative contact abut against the lower cover 1502. The upper cover 1501 and the lower cover 1502 are closed and fixed.

[0126] Obviously, in the embodiment, a cover 500 is used to install the contact 100, while in the comparative example, an upper cover 1501 and a lower cover 1502 that can fit together are used to install the comparative contact 1100. In comparison, the embodiment saves parts and reduces material and processing costs.

[0127] 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.

[0128] 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 sharpening device, comprising: Switch, motor, and blade body; The on / off state of the switch controls the motor to start or stop. When the motor starts, the blade can cut the pencil. The electric pencil sharpening device further includes: a cover, a contact element, and a transmission element. The cover includes a track component for forming a guide track, and the contact component is disposed within the guide track; When a pencil is inserted into the electric pencil sharpening device, the pencil contacts the contact member, causing the contact member to move within the guide rail, and causing the transmission member to switch the on / off state of the switch.

2. The electric pencil sharpening device according to claim 1, characterized in that, The guide rail includes a top wall, a side wall, and a bottom wall, and the contact element simultaneously contacts the top wall, the side wall, and the bottom wall.

3. The electric pencil sharpening device according to claim 2, characterized in that, The inner wall of the cover forms the top wall of the track; the track component forms the side wall and bottom wall of the track.

4. The electric pencil sharpening device according to claim 2, characterized in that, The track component includes a bent portion, the side of which near the cover is used to form the bottom wall of the track.

5. The electric pencil sharpening device according to claim 4, characterized in that, The side of the bent portion away from the cover is used to form a guide surface that facilitates the assembly of the contact element into the guide rail.

6. The electric pencil sharpening device according to claim 1, characterized in that, It also includes a reset member, which is kinetically connected to the contact member so that after the pencil is pulled out of the electric pencil sharpener, the contact member can return to the initial position before the pencil was inserted into the electric pencil sharpener.

7. The electric pencil sharpening device according to claim 6, characterized in that, The reset member includes an elastic element, which is kinetically connected to the contact element. When the contact element displaces away from the pencil in the radial direction, the elastic element undergoes elastic deformation and generates a reset stress that facilitates the contact element returning to its initial position before the pencil is inserted into the electric pencil sharpener.

8. The electric pencil sharpening device according to claim 6, characterized in that, The contact element includes an elastic guide rail, and the elastic element is disposed inside the elastic guide rail.

9. The electric pencil sharpening device according to any one of claims 1 to 8, characterized in that, The track component includes at least one set of paired track posts.

10. The electric pencil sharpening device according to any one of claims 1 to 8, characterized in that, The track component is integrally formed with the cover.

11. The electric pencil sharpening device according to any one of claims 1 to 8, characterized in that, The track component is made of soft, elastic rubber.

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