Electric pencil sharpener capable of resisting dust interference

Abstract

The utility model relates to the field of pencil sharpeners, in particular to an anti-dust-interference electric pencil sharpener which comprises a shell, a pencil sharpening assembly, a power source and a circuit board, the shell is used for containing the pencil sharpening assembly, the power source and the circuit board, the pencil sharpening assembly is used for conducting pencil sharpening operation on a pencil body to be sharpened, and the power source is electrically connected with the circuit board and the pencil sharpening assembly. The circuit board is used for enabling the pencil sharpening assembly to be electrically connected with an external circuit, the temperature sensing assembly comprises a temperature sensor which is fixed to the circuit board and installed on the circuit board, and the control assembly is used for controlling the temperature sensor. The control assembly is integrated on the circuit board and is in electric signal connection with the temperature sensing assembly, the pencil sharpening assembly and the power source. According to the pencil sharpener, the temperature sensor is fixed and installed on the circuit board, the defect of using an electric wire assembly is overcome, and the situation that flying dust enters a socket in the circuit board in the pencil sharpening process is reduced.

Description

Technical Field

[0001] This application relates to the field of pencil sharpeners, and particularly to an electric pencil sharpener resistant to dust interference. Background Art

[0002] In the field of stationery supplies, electric pencil sharpeners are widely popular due to their convenience and efficiency. However, with the increasing market demand and continuous iteration of products, some problems have emerged in the design and use of electric pencil sharpeners, especially the problem that the temperature switch control mechanism is easily interfered by dust, which seriously affects the performance and service life of the products.

[0003] The main function of the temperature switch control mechanism is to monitor the temperature during the operation of the motor and automatically cut off the power when the temperature is too high to protect the motor from damage. This mechanism is crucial for ensuring the safe operation of the electric pencil sharpener. The existing temperature switch control mechanisms generally use bimetal thermostats. The bimetal thermostats need to cooperate with wire assemblies to attach the thermostat to the component to be measured. Due to the structural limitations of sockets, plugs, etc., the wire assemblies are easily affected by dust, resulting in abnormal operation.

[0004] In addition, this type of thermostat generally has two structures: with and without its own housing. Among them, the thermostat with its own housing will block the conduction of part of the temperature due to the influence of the housing, making the reaction slower and unable to accurately control the temperature. At the same time, when in use, the switch needs to be closely attached to the surface of the heating element, and one switch is required for each important heating element, which will also increase the cost.

[0005] Although the one without a housing has a lower cost, since the metal sheet is exposed, when applied to products such as pencil sharpeners, the pencil dust generated is likely to enter the switch and cause a short circuit, damaging the components, resulting in a shorter service life of the product. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide an electric pencil sharpener resistant to dust interference to improve the problem of short service life of current electric pencil sharpeners due to dust interference.

[0007] To solve the above technical problems, this application adopts the following technical solutions:

[0008] An electric pencil sharpener resistant to dust interference, comprising a housing, a pencil sharpening assembly, a power source, and a circuit board. The housing is used to accommodate the pencil sharpening assembly, the power source, and the circuit board. The pencil sharpening assembly is used to perform pencil sharpening operations on the pencil to be sharpened. The power source is electrically connected to the circuit board and the pencil sharpening assembly. The circuit board is used to electrically connect the pencil sharpening assembly to an external circuit. The electric pencil sharpener further includes: a temperature sensing assembly and a control assembly. Among them, the temperature sensing assembly includes a temperature sensor fixed on the circuit board and mounted on the circuit board; the control assembly is electrically connected to the temperature sensing assembly, the pencil sharpening assembly, and the power source in an electrical signal manner.

[0009] Further, the temperature sensor is integrally integrated on the circuit board.

[0010] Further, the temperature sensor is a surface mount thermistor.

[0011] Further, the temperature sensor is insulated.

[0012] Further, the pencil sharpening assembly includes: a pencil sharpening core provided with a pencil sharpening cavity for performing pencil sharpening on the pencil to be sharpened; a power mechanism connected to the power source and the pencil sharpening core for providing power to the pencil sharpening core.

[0013] Further, the housing includes an upper housing and a lower housing. The upper housing and the lower housing form a sealed space, and the sealed space houses the pencil sharpening core, the power mechanism, the power source, the control assembly, and the temperature sensing assembly.

[0014] Further, the lower housing includes a support assembly provided inside the lower housing and a power source mounting position. The support assembly is used to support the circuit board without contacting the bottom of the lower housing; the power source mounting position is provided below the circuit board and does not contact the support assembly. The power source mounting position has a shape adapted to the surface of the power source for mounting the power source.

[0015] Further, the lower housing includes: a fixing member provided at the edge close to the inside of the lower housing for fixedly connecting the power mechanism.

[0016] Further, the lower housing further includes: a shock absorbing member provided at the connection between the fixing member and the power mechanism.

[0017] Further, the housing is provided with a through hole. The electric pencil sharpener further includes: a light source assembly including a surface mount light emitting triode fixed on the circuit board and mounted on the circuit board; a sealed light guiding assembly including a light signal input end and a light signal output end. The light signal input end is coupled to the surface mount light emitting triode, and the light signal output end is used for at least one light path of the surface mount light emitting triode to pass through the through hole.

[0018] As can be seen from the above technical solutions, the advantages and positive effects of the electric pencil sharpener resistant to dust interference proposed in this application are as follows:

[0019] This application fixes and installs a temperature sensor on the circuit board, avoiding the defects of using wire components, reducing the dust floating during the pencil sharpening process from entering the sockets on the circuit board, and cooperating with the control component to monitor the temperature of the internal components of the electric pencil sharpener and provide temperature protection for the internal components of the electric pencil sharpener, so as to improve the service life of the product. In addition, compared with the assembly method of the temperature control switch of the bimetal type that requires wire components, this application installs both the temperature sensor and the control component on the circuit board, reducing the assembly process of the internal components. At the same time, when there are problems with the product temperature protection, the temperature sensor and the control component can be directly checked and replaced, facilitating the later maintenance work of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above content of this application and the following specific embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are only examples of the claimed technical solutions.

[0021] Figure 1 is an assembly schematic diagram of the temperature control switch structure of the prior art;

[0022] Figure 2 is a structural diagram of the electric pencil sharpener according to the first embodiment provided by this application;

[0023] Figure 3 is an assembly diagram of the circuit board according to the first embodiment provided by this application;

[0024] Figure 4 is a housing assembly diagram provided by this application;

[0025] Figure 5 is a structural diagram of the lower housing provided by this application;

[0026] Figure 6 is a structural diagram of the upper housing provided by this application;

[0027] Figure 7 is an assembly diagram of the circuit board according to the second embodiment provided by this application;

[0028] Figure 8 is a structural diagram of the electric pencil sharpener according to the second embodiment provided by this application.

[0029] Among them, the reference numerals are explained as follows:

[0030] Circuit board 10;

[0031] 2P socket 101;

[0032] Wire component 20;

[0033] 2P plug 201;

[0034] Metal connector terminal 202;

[0035] Wire 203;

[0036] Bimetallic thermostat switch 204;

[0037] Housing 30;

[0038] Lower housing 31;

[0039] Power supply installation position 311;

[0040] Fixing part 312;

[0041] Support component 313;

[0042] Upper housing 32;

[0043] Pencil sharpening component 40;

[0044] Pencil sharpening movement 41;

[0045] Pencil sharpening cavity 411;

[0046] Power mechanism 42;

[0047] Power supply 50;

[0048] Temperature sensing component 60;

[0049] Control component 70;

[0050] Light source component 80;

[0051] Sealing and light guiding component 90. Detailed implementation manners

[0052] The detailed features and advantages of the present application are described in detail in the following detailed implementation manners. The content is sufficient for any person skilled in the art to understand the technical content of the present application and implement it accordingly. According to the specification, claims and drawings disclosed in this specification, those skilled in the art can easily understand the related purposes and advantages of the present application.

[0053] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0054] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0055] To make the objectives, technical solutions, and advantages of this application more clear, the following will further describe in detail the implementation manners of this application with reference to the accompanying drawings.

[0056] Please refer to Figure 1 As shown, the temperature control switch structure of the prior art generally uses a bimetal type temperature control switch. Its working principle is that when the pencil sharpener is working properly, the bimetal is in a free state, and the contacts are in a closed / open state. When the temperature rises to the operating temperature value, the bimetal element is heated to generate internal stress and quickly acts to open / close the contacts, cut off / connect the circuit, thereby playing a thermal protection role. When the temperature drops to the set temperature, the contacts automatically close / open and return to the normal working state.

[0057] This kind of temperature control switch needs to be used in cooperation with a corresponding wire assembly. Specifically, a 2P socket 101 needs to be designed on the circuit board 10. One end of the wire 203 in the wire assembly needs to be crimped with a metal connector terminal 202 and then inserted into a 2P plug. The other end is connected to the bimetal temperature control switch 204, and then the 2P plug is inserted into the 2P socket 101 on the circuit board 10. The entire structure not only has a large number of parts, the connections between parts and the parts themselves are easily interfered by dust, and the processing and assembly processes are also many and complex, ultimately resulting in high product costs.

[0058] Please refer to Figure 2 and Figure 3 This application provides an electric pencil sharpener resistant to dust interference. The electric pencil sharpener may include a housing 30, a pencil sharpening assembly 40, a power source 50, a circuit board 10, a temperature sensing assembly 60, and a control assembly 70.

[0059] Among them, the housing 30 is used to accommodate the pencil sharpening assembly 40, the power source 50, the circuit board 10, the temperature sensing assembly 60, and the control assembly 70; the pencil sharpening assembly 40 is used to perform a pencil sharpening operation on the pencil to be sharpened; the power source 50 is electrically connected to the circuit board 10 and the pencil sharpening assembly 40; the circuit board 10 may be a printed circuit board (PCB) and is used to electrically connect the pencil sharpening assembly 40 to an external circuit. The temperature sensing assembly 60 includes a temperature sensor fixed on and installed on the circuit board 10; the control assembly 70 is electrically connected to the temperature sensing assembly 60, the pencil sharpening assembly 40, and the power source 50 and is used to transmit control signals to the temperature sensing assembly 60 and the pencil sharpening assembly 40.

[0060] In one embodiment, the temperature sensor may be a surface mount thermistor, and the surface mount thermistor is integrally integrated on the circuit board 10.

[0061] It can be understood that surface mount thermistors are usually designed to be miniaturized, enabling them to be directly mounted on the circuit board 10, reducing the interference of dust on component connections. Further, since no additional leads are required, valuable space on the circuit board 10 is saved, making it suitable for use in electric pencil sharpeners, improving the portability of the electric pencil sharpener and the designability of the internal space. Moreover, surface mount thermistors are suitable for Surface Mounted Technology (SMT), allowing for rapid mounting on an automated production line, reducing manual operations, lowering labor costs, while improving assembly efficiency and production accuracy. In addition, surface mount thermistors can accurately measure the temperature of the circuit board 10 and its surrounding environment, providing basic data for temperature control. Since they are directly mounted on the circuit board 10, they can sense temperature changes more quickly, enhancing the real-time performance and accuracy of temperature measurement.

[0062] The temperature sensor can be insulated.

[0063] Exemplarily, the temperature sensing assembly can further include an insulating component, which can be arranged near the temperature sensor to generate an air flow for cleaning the dust that has fallen on the surface of the temperature sensor.

[0064] Further, the pencil sharpening assembly 40 can include: a pencil sharpening mechanism 41 and a power mechanism 42. Among them, the pencil sharpening mechanism 41 is provided with a pencil sharpening cavity 411 for sharpening the pencil to be sharpened; the power mechanism 42 is connected to the power supply 50 and the pencil sharpening mechanism, and is used to provide power for the pencil sharpening mechanism.

[0065] Exemplarily, the power mechanism 42 can be a brushed DC motor or a brushless DC motor.

[0066] A brushed DC motor mainly consists of two parts: a stator and a rotor. The stator part includes main magnetic poles and brushes. The brushes are used to contact the commutator of the rotor to achieve current commutation. The rotor part includes an armature winding and a commutator. The commutator continuously contacts and rubs against the brushes during rotation to maintain the continuous rotation of the motor.

[0067] A brushless DC motor also mainly consists of a stator and a rotor. The rotor is a permanent magnet, and the stator includes a current-carrying body (coil). Compared with a brushed DC motor, it does not require brushes and a commutator and adopts an electronic commutation method.

[0068] It can be understood that since the technology of brushed DC motors is mature and the cost is relatively low, while brushless DC motors, although having superior performance, also have a relatively high cost. To further reduce the product production cost of the electric pencil sharpener, a brushed DC motor can be preferably selected.

[0069] Please refer to Figures 4 to 6, the housing 30 may include an upper housing 32 and a lower housing 31. The upper housing 32 and the lower housing 31 form a sealed space, which houses a pencil sharpening mechanism 41, a power mechanism 42, a power supply 50, a control component 70, and a temperature sensing component 60.

[0070] It can be understood that all the heat-generating components in the electric pencil sharpener, such as the power mechanism 42, the power supply 50, the control component 70, etc., are in the same sealed space, and dust is isolated to prevent dust from falling on the temperature sensor. As long as the parameter value of the temperature sensor is set to the corresponding parameter value of the component with the lowest maximum allowable operating temperature among all components, the protection of all other components can be achieved. Therefore, a single temperature sensor can achieve the temperature protection of all components, which also greatly saves the material cost.

[0071] Specifically, the lower housing 31 may include a support component 313 and a power supply installation position 311 provided inside the lower housing 31. The support component 313 is used to support the circuit board 10 without contacting the bottom of the lower housing 31 to improve the protection level of the circuit board 10. The power supply 50 installation position is provided below the circuit board 10 and does not contact the support component 313. The power supply installation position 311 has a shape adapted to the surface of the power supply 50, which can play a role in protecting and fixing the power supply 50. Exemplarily, when the surface of the power supply 50 is cylindrical, the power supply installation position 311 is adaptively shaped to fit the cylindrical shape (either cylindrical or rectangular, etc.).

[0072] Furthermore, the lower housing 31 may further include: a fixing member 312 and a vibration damping member (not shown in the figure). Among them, the fixing member 312 is provided near the edge inside the lower housing 31 for fixedly connecting the power mechanism 42. The vibration damping member is provided at the connection between the fixing member 312 and the power mechanism 42 to reduce the influence of the power mechanism 42 on the vibration of the lower housing 31. Exemplarily, the vibration damping member may be a rubber ring or a silicone ring, which is sleeved at the connection between the fixing member 312 and the power mechanism 42.

[0073] It can be understood that by fixing the power mechanism 42 to the edge of the housing 30 through the fixing member 312, the space can be utilized more effectively, avoiding overcrowding in the core area, thereby making room for other key components (such as the power supply 50, sensors, circuit board 10, etc.).

[0074] Please refer to Figure 7 and Figure 8, in an implementable manner of the present application, the upper housing or the lower housing 31 may be provided with through holes (not shown in the figures), and the electric pencil sharpener may further include: a light source assembly 80 and a sealed light guide assembly 90. Among them, the light source assembly 80 includes a light source fixed to the circuit board 10 and mounted on the circuit board 10; the sealed light guide assembly 90 includes a light signal input end and a light signal output end, the light signal input end is coupled to the light source, and the light signal output end is used for at least one light path of the light source to pass through the through hole.

[0075] Exemplarily, the light source assembly 80 may be a surface-mounted light-emitting triode, integrally integrated on the circuit board 10.

[0076] It can be understood that the surface-mounted light-emitting triode can also be called a surface-mounted LED or a surface-mounted light-emitting diode. It adopts a miniaturized design, and its size is much smaller than that of the traditional through-hole LED, which can significantly reduce the occupied space on the circuit board 10. In addition, due to its small volume, the surface-mounted LED is easier to achieve high-density integration in small electronic devices.

[0077] Compared with the traditional through-hole LED commonly used in the industry for electric pencil sharpeners, the surface-mounted LED does not require manual soldering of pins, reducing the complexity and error rate in the assembly process. At the same time, the surface-mounted light-emitting triode is suitable for the surface mounting process on an automated production line, greatly improving the production efficiency. The surface-mounted package provides better protection for the LED chip, reducing the risk of damage caused by external impact or vibration.

[0078] In an implementable manner of the present application, the surface-mounted light-emitting triode may include multiple types of different colors, used to generate light sources of different colors, so as to display the current working state information of the electric pencil sharpener by the light path passing through the through hole of the housing 30 or the color representation of the corresponding light source presented outside the housing 30.

[0079] It can be understood that the working state information may be a safety warning. For example, if the pencil sharpener detects overheating, jamming or other abnormal conditions, the surface-mounted light-emitting triode can emit red or flashing lights to remind the user to stop using and check the pencil sharpener.

[0080] Exemplarily, the sealed light guide group may be an integrally formed light guide column. Through specific processing techniques (such as injection molding, die casting, etc.), each part structure of the light guide column (such as the light inlet, transmission channel, light outlet, etc. of the light guide column) is formed at one time without subsequent assembly, thereby improving the integrity and precision of the product.

[0081] Since the integrally formed light guide column is formed at one time, it avoids the errors that may occur during the assembly process, improving the precision of the light guide column. And the overall structure is firm, not easy to loosen or deform, ensuring the stability of long-term use. The loss of light during transmission is small, improving the utilization rate and transmission efficiency of light.

[0082] It can be understood that by directly integrating the light source component 80 on the circuit board 10 and replacing the way of connecting the circuit board 10 and the light source with the wire 203, the protection level of the electric pencil sharpener against pencil dust can be improved, and the influence of the pencil dust on the light source component 80 can be reduced.

[0083] The terms and expressions used herein are for descriptive purposes only, and the present application should not be limited to these terms and expressions. The use of these terms and expressions does not mean excluding any equivalent features of the illustration and description (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 regarded as covering all such equivalents.

[0084] Similarly, it should be noted that although the present application has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, as long as the changes and variations of the above embodiments are within the scope of the substantial spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. An electric pencil sharpener resistant to dust interference, comprising a housing, a pencil sharpener assembly, a power supply and a circuit board, wherein the housing is used to accommodate the pencil sharpener assembly, the power supply and the circuit board, the pencil sharpener assembly is used to sharpen a pencil body to be sharpened, the power supply is electrically connected to the circuit board and the pencil sharpener assembly, and the circuit board is used to electrically connect the pencil sharpener assembly to an external circuit, characterized in that: The electric pencil sharpener further comprises: a temperature sensing component and a control component, wherein: The temperature sensing assembly includes a temperature sensor mounted on the circuit board; The control component is integrated on the circuit board and is connected to the temperature sensor component, the pencil sharpener component and the power supply electrical signal.

2. The electric pencil sharpener according to claim 1, characterized in that: The temperature sensor is integrated on the circuit board.

3. The electric pencil sharpener according to claim 1, characterized in that: The temperature sensor is a chip thermistor.

4. The electric pencil sharpener according to claim 1, characterized in that: The temperature sensor is insulated.

5. The electric pencil sharpener according to claim 1, characterized in that: The pencil sharpening assembly comprises: A pencil sharpening mechanism, provided with a pencil sharpening chamber for sharpening the pencil body to be sharpened; A power mechanism is connected to the power source and the pencil sharpener core and is used to provide power for the pencil sharpener core.

6. The electric pencil sharpener according to claim 5, characterized in that: The shell comprises an upper shell and a lower shell, wherein the upper shell and the lower shell form a closed space, and the closed space accommodates the pencil sharpener core, the power mechanism, the power supply, the control component and the temperature sensor component.

7. The electric pencil sharpener according to claim 6, characterized in that: The lower housing includes a support assembly and a power supply installation position arranged inside the lower housing, The support assembly is used to support the circuit board so as not to contact the bottom of the lower housing; The power supply installation position is arranged below the circuit board and does not contact the supporting assembly. The power supply installation position has a shape adapted to the surface of the power supply and is used for installing the power supply.

8. The electric pencil sharpener according to claim 6, characterized in that: The lower housing comprises: A fixing member is arranged at an edge close to the interior of the lower shell body and is used for fixing and connecting the power mechanism.

9. The electric pencil sharpener according to claim 8, characterized in that: The lower housing also includes: The vibration damping member is arranged at the connection between the fixing member and the power mechanism.

10. The electric pencil sharpener according to claim 1, characterized in that: The housing is provided with a through hole, and the electric pencil sharpener further comprises: A light source assembly, comprising a surface-mount light-emitting triode mounted on the circuit board; The sealed light guide assembly comprises an optical signal input end and an optical signal output end, wherein the optical signal input end is coupled with the SMD light emitting triode, and the optical signal output end is used for at least one optical path of the SMD light emitting triode to pass through the through hole.

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