Starting front safety protection device of electric pencil sharpener
By using a single micro switch and limit mechanism design in the electric pen cutting machine, the problem of complexity of the dual micro switch system is solved, and the effects of structure simplification, safety improvement and cost reduction are achieved.
Patent Information
- Application Number
- CN202421549583.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-02
AI Technical Summary
The dual micro switch system of existing electric pen cutting machines is complex in space and circuit arrangement, which increases the complexity of structural arrangement and manufacturing cost.
A single micro switch is used to control the start and stop of the motor, and the limiting mechanism ensures that the slider can trigger the micro switch only when the top cover is properly closed and the pencil is inserted.
It simplifies circuit design, reduces manufacturing costs and failure rates, improves the safety and structural compactness of the pen cutting machine, and is suitable for electric pen cutting machines of different specifications and designs.
Smart Images
Figure CN222742447U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an electric pencil sharpener, in particular to a pre-start safety protection device for the electric pencil sharpener. When the upper cover of the electric pencil sharpener is opened, the safety protection device can lock the start switch to prevent the switch of the pencil sharpener from starting, thereby playing a role of safety protection. Background Art
[0002] The pre-start safety guard of an electric pencil sharpener is an important safety feature designed to prevent the sharpener from being started in unsafe circumstances, thereby protecting the safety of users, especially children.
[0003] Electric pencil sharpeners usually have a housing with an opening at the top for pouring out pencil shavings and pencil powder. The opening is connected to a top cover that can be removed for easy cleaning.
[0004] A micro switch is set near the hole for pencil insertion in the movement. When the pencil is inserted, it squeezes the slider to make it slide, triggering the micro switch, thereby controlling the start of the machine. Safety structure: In order to prevent the user from accidentally inserting a finger into the pencil insertion hole after the cover is opened and causing the machine to start, the technicians proposed adding a locking mechanism, which requires the slider to be unlocked before the pencil is inserted.
[0005] To further enhance safety, some electric pencil sharpeners are designed with a dual microswitch system. For example, one microswitch is triggered when a pencil is inserted, and the other microswitch is connected to the machine top cover. The machine will only start working when both microswitches are triggered at the same time. In this way, even if the user accidentally triggers the microswitch at the pencil insertion hole when dumping pencil shavings, the machine will not start if the machine top cover is not installed correctly.
[0006] The double micro switch system requires two micro switches, which need to be connected to the control circuit at the same time. On the one hand, it will increase the layout of the circuit, and on the other hand, the micro switch is large in size, which increases the complexity of the structural layout in the narrow installation space of the pencil sharpener. Utility Model Content
[0007] The technical problem to be solved by the utility model is to provide a pre-start safety protection device for an electric pencil sharpener which uses only one micro switch and has a simplified structural layout.
[0008] The utility model solves the above technical problems by adopting the following technical solutions: a pre-start safety protection device for an electric pencil sharpener comprises a top cover with a pen feeding hole, a micro switch mounted on a roller cutter fixing seat, a slider and a limit mechanism; the micro switch can start the motor;
[0009] The roller cutter fixing seat is provided with a pen feeding channel corresponding to the pen feeding hole; the top cover includes a top wall and a peripheral side wall;
[0010] The slider includes a blocking member extending into the pen feeding channel and a pushing portion contacting with a spring sheet of a micro switch; the slider can slide between a first position and a second position on the roller fixing seat; the spring sheet of the micro switch elastically keeps the slider in the first position;
[0011] The limiting mechanism comprises a lower elastic member and an upper limiting member; the limiting member comprises a vertical main body and a limiting portion provided on one side of the vertical main body; the limiting portion limits the slider to be in the first position;
[0012] The top wall of the top cover presses down the vertical body, and the limit part on the vertical body moves downward away from the push part; when a pencil is inserted into the pen feeding channel and presses the blocking member, the slider can slide linearly from the first position to the second position, and the push part presses the spring to trigger the micro switch, and the motor starts;
[0013] When the top cover is opened, the elastic member pushes the vertical body upward, and the limiting portion on the vertical body keeps the slider in the first position; the blocking member entering the pen feeding channel can prevent the pencil from being inserted.
[0014] A further preferred technical solution of the utility model is that the blocking member extends along the direction of the pen feeding channel, and the front surface has a guiding curvature.
[0015] A further preferred technical solution of the utility model is that a notch is provided at the entrance of the pen feeding channel for the blocking member to enter and exit.
[0016] A further preferred technical solution of the utility model is: a concave hole is provided on the hob fixing seat, the elastic member and the limit member are arranged in the concave hole, the limit member is a first convex block arranged on one side of the vertical body; the push member includes a push body and a second convex block on one side;
[0017] When the top cover is opened, the limiter rises under the elastic force of the elastic member, and the first protrusion blocks the second protrusion; the slider is limited to the first position; when the top cover is closed, the limiter is pressed down, the first protrusion drops away from the second protrusion, and the slider can be moved to the second position.
[0018] A further preferred technical solution of the utility model is: the hob fixing seat is provided with a fixing cover, the fixing cover seals the micro switch, the slider and the limit mechanism, and the fixing cover is provided with two through holes which are respectively aligned with the pen feed hole and the pen feed channel.
[0019] Another preferred topic: a pre-start safety protection device for an electric pencil sharpener, comprising a top cover with a pen feeding hole, a micro switch mounted on a hob fixing seat, a slider and a limit mechanism; the micro switch controls the start and stop of the motor;
[0020] The top cover is arranged on the upper side of the roller cutter fixing seat, and the pen feeding channel on the roller cutter fixing seat corresponds to the pen feeding hole;
[0021] The slider includes a blocking member extending to the path of the pen feeding channel and a pushing portion contacting with the spring of the micro switch;
[0022] The limiting mechanism is arranged at one side of the pushing part and is controlled by the top cover; when the top cover is opened and away from the limiting mechanism, the limiting mechanism locks the slider to prevent the slider from sliding; when the top cover covers and presses the limiting mechanism, the limiting mechanism is unlocked, the blocking member is acted upon by an external force, and the slider moves from the first position on the hob fixing seat to the second position to trigger the micro switch;
[0023] After the external force on the blocking member is removed, the elastic force of the spring of the micro switch can reset the slider from the second position to the first position.
[0024] A further preferred technical solution of the utility model is: the limiting mechanism comprises a lower elastic member and an upper limiting member; the limiting member comprises a vertical main body and a limiting portion arranged on one side of the vertical main body;
[0025] In the unlocked state, the top wall of the top cover presses down the vertical body and compresses the elastic member, and the limiting portion on the vertical body moves downward to disengage from the limiting position of the pushing portion;
[0026] In the locked state, the top cover is opened, the resilience of the elastic member causes the vertical body to return upward, and the limiting portion locks the push portion in the first position.
[0027] A further preferred technical solution of the utility model is: the blocking member extends along the direction of the pen feeding channel, and the front surface has a guiding curvature; a notch for the blocking member to enter and exit is provided at the entrance of the pen feeding channel.
[0028] A further preferred technical solution of the utility model is: the hob fixing seat is provided with a fixing cover, the fixing cover seals the micro switch, the slider and the limit mechanism, and the fixing cover is provided with a through hole aligned with the pen feed hole and the pen feed channel.
[0029] Another preferred subject: a pre-start safety protection device for an electric pencil sharpener, comprising a top cover provided with a pen feed hole, a micro switch mounted on a hob fixing seat, a slider and a limit mechanism; the micro switch controls the start and stop of the motor; the slider comprises a blocking member extending into the pen feed channel and a push portion contacting with a spring sheet of the micro switch; the top cover is arranged on the upper side of the hob fixing seat, and the pen feed channel on the hob fixing seat corresponds to the pen feed hole;
[0030] At least a part of the slider is distributed on the pen feeding channel, and the slider can move from a first position on the roller cutter fixing seat to a second position to trigger the micro switch; the elastic force of the spring of the micro switch can reset the slider at the second position to the first position;
[0031] The limiting mechanism comprises a lower elastic member and an upper limiting member; the limiting member comprises a vertical main body and a limiting portion provided on one side of the vertical main body; the limiting portion limits the slider to be in the first position;
[0032] When the top cover is closed, the top wall of the top cover presses down the vertical body, and the limiting portion on the vertical body moves downward to break away from the restriction on the slider;
[0033] When a pencil is inserted into the pen-feeding channel and the slider is pressed, the slider moves until it presses the micro switch spring, and the motor starts;
[0034] When the top cover is opened, the elastic member pushes the vertical body upward, and the limiting portion on the vertical body locks the slider in the first position to prevent objects from entering the pen feeding channel.
[0035] A further preferred technical solution of the utility model is: the slider includes a blocking member extending into the pen feeding channel and a pushing portion contacting with the spring of the micro switch;
[0036] The blocking member extends along the direction of the pen feeding channel, and the front surface has a guiding curvature;
[0037] A notch is provided at the entrance of the pen feeding channel for the blocking member to enter and exit.
[0038] A further preferred technical solution of the utility model is: the hob fixing seat is provided with a fixing cover, the fixing cover seals the micro switch, the slider and the limit mechanism, and the fixing cover is provided with two through holes which are respectively aligned with the pen feed hole and the pen feed channel.
[0039] Compared with the prior art, the utility model has the following advantages: the pre-start safety protection device of the electric pencil sharpener is cleverly designed to effectively solve the complexity of the traditional double micro switch system in terms of space and circuit layout. The device uses a single micro switch to control the start and stop of the motor, which simplifies the circuit design, reduces the manufacturing cost and failure rate, and also makes the structure of the pencil sharpener more compact, easy to carry and store.
[0040] Furthermore, the technical solution improves the safety of the pencil sharpener through the innovative design of the limit mechanism. The limit mechanism includes an elastic member and a limit member, which ensures that the slider can trigger the micro switch only when the top cover is properly closed and the pencil is inserted. This double safety guarantee mechanism effectively prevents accidental startup and protects users from potential safety risks.
[0041] In addition, this technical solution greatly improves the user experience. The user operation is simpler and more intuitive. Just insert the pencil and close the top cover to start the pencil sharpening process. The simplified operation process makes the electric pencil sharpener easier to use and suitable for users of all ages.
[0042] Finally, this technical solution improves the reliability and durability of the pencil sharpener by reducing the number of parts and simplifying the mechanical structure. With reduced maintenance requirements and longer service life, users can expect less maintenance and longer-lasting performance. At the same time, this design is also highly adaptable and can be applied to electric pencil sharpeners of different specifications and designs, providing possibilities for product diversification and innovation. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be used as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematically representing the composition or structure of the described object and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.
[0044] Figure 1 An illustration of the use of an electric pencil sharpener Figure 1 ;
[0045] Figure 2 Schematic diagram of the disassembly of the structure of an electric pencil sharpener Figure 1 ;
[0046] Figure 3 Schematic diagram of the disassembly of the structure of an electric pencil sharpener Figure 2 ;
[0047] Figure 4 It is a schematic diagram of the internal structure of an electric pencil sharpener;
[0048] Figure 5 This is a sign that the safety switch is in the locked state. Figure 1 ;
[0049] Figure 6 This is a sign that the safety switch is in the locked state. Figure 2 ;
[0050] Figure 7 This is the indication that the safety switch is in the unlocked state. Figure 1 ;
[0051] Figure 8 This is the indication that the safety switch is in the unlocked state. Figure 2 ;
[0052] Fig. 9This is a schematic diagram of the structure of the hob fixing seat of the utility model;
[0053] Fig.10 This is a schematic diagram of the structural disassembly of the front safety switch;
[0054] Fig.11 It is a cross-sectional view of the front safety switch in locked state;
[0055] Fig.12 It is a cross-sectional view of the front safety switch in unlocked state;
[0056] Fig.13 for Figure 5 A magnified view of the local structure at point A in the middle;
[0057] Fig.14 for Figure 7 A magnified view of the local structure at point B in the middle. DETAILED DESCRIPTION
[0058] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.
[0059] It should be noted that like reference numerals denote similar items in the following drawings, and thus, once an item is defined in one drawing, it will not be further defined or explained in the subsequent drawings.
[0060] like Figures 1 to 8 As shown, the pre-start safety protection device 100 of the electric pencil sharpener in the technical solution is an innovative safety mechanism, which is composed of a top cover 10, a hob fixing seat 20, a micro switch 30, a slider 40 and a limit mechanism 50. Among them, the top cover 10 is provided with a pen feed hole 11 to ensure that the pencil can be safely inserted. The hob fixing seat 20 supports the hob of the pencil sharpener, and corresponds to the pen feed hole 11 through the pen feed channel 21 to ensure the correct guidance of the pencil.
[0061] Secondly, the micro switch 30, as a key component for controlling the start and stop of the motor, is installed on the hob fixing seat 20, and its triggering mechanism is controlled by the slider 40. The slider 40 is distributed on the pen feeding channel 21, and can move from the first position of the hob fixing seat 20 to the second position, triggering the micro switch 30 and starting the motor.
[0062] Furthermore, the limiting mechanism 50 is controlled by the top cover 10. When the top cover 10 is closed, the slider 40 is unlocked to allow it to move; and when the top cover 10 is opened, the limiting mechanism 50 locks the slider 40 to prevent it from sliding, thereby avoiding accidental activation of the pencil sharpener. This design not only improves the safety of the electric pencil sharpener, but also reduces space occupation and installation complexity by simplifying the mechanical structure and circuit connection, providing users with a safe and convenient pencil sharpening solution. The details will be explained below:
[0063] In order to achieve seamless connection between pencil insertion and automatic pencil sharpening, the slider 40 is a key component, at least a part of which is distributed on the pen feeding channel 21. When the pencil is inserted, the slider 40 is pushed and smoothly moves from the first position of the roller fixing seat 20 to the second position. This movement triggers the micro switch 30, which then starts the motor and drives the roller to start cutting the pencil. During the whole process, the cooperation between the slider 40 and the micro switch 30 ensures the automatic cutting of the pencil. At the same time, the precise movement of the slider 40 also reflects the efficiency and response speed of the electric pencil sharpener.
[0064] After the pencil is cut, the user pulls out the pencil. At this time, the slider 40 is quickly reset from the second position to the first position with the help of the elastic force of the spring 31 of the micro switch 30, and the motor power is automatically cut off to stop the motor. This reset mechanism not only reflects the safety characteristics of the electric pencil sharpener and prevents accidental startup, but also ensures that the pencil sharpener is always ready for the user's next use. By optimizing the interaction between the slider 40 and the micro switch 30, the electric pencil sharpener provides a simple, intuitive and safe user experience, and the pencil sharpening task can be completed without complicated operations, which greatly improves the user's convenience and pencil sharpening efficiency.
[0065] The limiting mechanism 50, the slider 40 and the top cover 10 of the electric pencil sharpener together form a precise mechanical coordination system, which ensures the safety of the pencil sharpener and the ease of operation. The limiting mechanism 50 is composed of an elastic member 51 and a limiting member 52, wherein the elastic member 51 provides elastic force, and the limiting member 52 directly contacts the slider 40 to control its position on the hob fixing seat 20. When the top cover 10 is opened and away from the limiting member 52, the limiting mechanism 50 locks the slider 40 to prevent it from sliding, thereby avoiding accidental starting of the motor.
[0066] The correct closing of the top cover 10 is a key step in activating the pencil sharpener. When the top cover 10 is closed and pressure is applied, the elastic member 51 is compressed, the limiting portion b2 of the limiting member 52 drops, and the unlocking slider 40 is moved from the first position to the second position when the pencil is inserted, triggering the micro switch 30 and starting the motor to sharpen the pencil. This process not only reflects the safety of the design, but also ensures that the pencil sharpener will only start under correct operation.
[0067] This mechanical synergy provides users with an intuitive and safe operating experience. The user only needs to close the top cover 10 and insert a pencil, and the pencil sharpener will automatically start sharpening the pencil. After the pencil is pulled out, the slider 40 automatically resets and the motor stops. The entire process does not require additional operations and is simple and convenient. In addition, while improving the efficiency of pencil sharpening, the electric pencil sharpener also greatly reduces safety hazards during use, preventing the top cover 10 from opening and the user's hand or foreign objects from touching the slider 40 (or other components) and accidentally triggering the motor.
[0068] Specifically, if Fig. 9 and Fig.10 As shown, the slider 40 includes a blocking member 41 extending into the pen-feeding channel 21 and a push portion 42 contacting the spring 31 of the micro switch 30; the blocking member 41 extends along the pen-feeding channel 21, and a notch 22 for the blocking member 41 to enter and exit is provided at the entrance of the pen-feeding channel 21. The blocking member 41 extends along the pen-feeding channel 21 to ensure that the push portion 42 can be accurately triggered when a pencil is inserted. The notch 22 at the entrance of the pen-feeding channel 21 provides necessary space for the blocking member 41, and quickly resets after the pencil is pulled out, so that it can move smoothly when the pencil is inserted and pulled out.
[0069] Preferably, the front surface of the blocking member 41 has a guide curvature. The design of the guide curvature enables the pencil to move more smoothly along a predetermined trajectory when inserted into the pen-feeding channel 21. This curvature can reduce the friction resistance when the pencil is inserted, ensuring that the pencil smoothly enters the pencil sharpening area. In addition, the smooth guide curvature reduces the sharp edges or angles that the pencil may encounter during the insertion process, thereby reducing the risk of the pencil lead breaking or being damaged. Moreover, the design of the guide curvature allows the user to easily insert the pencil without additional force, thereby improving the user experience.
[0070] More specifically, the top cover 10 is composed of a top wall 17 and a peripheral side wall 18, which not only seals and protects the internal components, but also is a key part of triggering the working process of the pencil sharpener. In the unlocked state, the top wall 17 presses down the vertical body b1, compresses the elastic member 51, and causes the limiter b2 to disengage from the slider 40, allowing the slider 40 to move. In the locked state, the opening of the top cover 10 causes the elastic member 51 to reset the vertical body b1, and the limiter b2 moves up to lock the slider 40 to prevent it from moving.
[0071] The limiting mechanism 50 is composed of a vertical body b1 and a limiting portion b2, and works in conjunction with the elastic member 51 to control the position of the slider 40. In the unlocked state, the downward pressure of the top wall 17 compresses the elastic member 51, causing the vertical body b1 to descend, and the limiting portion b2 moves downward accordingly, disengaging from the slider 40, allowing the slider 40 to move when a pencil is inserted. In the locked state, the opening of the top cover 10 causes the resilience of the elastic member 51 to push the vertical body b1 up, and the limiting portion b2 moves upward, locking the slider 40 in the first position.
[0072] In the unlocked state, Fig.12 , Fig.14 As shown, when the user is ready to start the pencil sharpener, the top cover 10 is closed. At this time, the top wall 17 of the top cover 10 applies pressure to the vertical body b1. This action not only pushes the vertical body b1 downward, but also compresses the elastic member 51. The compressed elastic member 51 stores energy in preparation for unlocking the slider 40. As the vertical body b1 moves downward, the limiting portion b2 thereon also moves downward, thereby disengaging from the limiting position of the push portion 42 of the slider 40, providing space for the movement of the slider 40. At this time, the slider 40 is in an unlocked state and can move freely to trigger the micro switch 30. At this time, when a pencil is inserted into the pen feed channel 21 to squeeze the blocking member 41, the slider 40 can slide straight from the first position to the second position, and the push portion 42 squeezes the spring 31 to trigger the micro switch 30, and the motor starts.
[0073] In the locked state, Fig.11 , Fig.13 As shown, the resilience of the elastic member 51 acts on the vertical body b1, causing it to reset upward. This reset action causes the limit portion b2 to move upward, thereby locking the slider 40 and fixing it in the first position. This locking mechanism ensures that the slider 40 will not move due to accidental touch, thereby avoiding the false triggering of the micro switch 30 and the accidental start-up of the motor. At this time, the slider 40 is in the first position; the blocking member 41 entering the pen feeding channel 21 can prevent the insertion of a pencil.
[0074] In addition, a concave hole 23 is provided on the hob fixing seat 20, and the elastic member 51 and the stopper 52 are arranged in the concave hole 23. The concave hole 23 provides a built-in space for the elastic member 51 and the stopper 52, so that these components can be compactly installed in the hob fixing seat 20. This technical means saves space and optimizes the internal layout of the electric pencil sharpener. Placing the elastic member 51 and the stopper 52 in the concave hole 23 can protect these sensitive components from external impact and dust, thereby improving the durability and reliability of the electric pencil sharpener.
[0075] It should be further explained that the limiting part b2 is a first protrusion v1 provided on one side of the vertical body b1, and the pushing part 42 includes a pushing body v3 and a second protrusion v2 on one side. When the top cover 10 is opened, the limiting member 52 rises under the elastic force of the elastic member 51, the first protrusion v1 blocks the second protrusion v2, and the slider 40 is limited to the first position.
[0076] When the top cover 10 is closed, the limiting member 52 is pressed downward, the first protrusion v1 moves down and away from the second protrusion v2, and the slider 40 can be moved to the second position.
[0077] The limiting portion b2 as the first protrusion v1 interacts with the second protrusion v2 of the push portion 42 to provide a precise limiting mechanism, thereby ensuring that the slider 40 can only move between two preset positions (the first position and the second position), thereby precisely controlling the triggering of the micro switch 30.
[0078] In addition, the compact design of the first protrusion v1 and the second protrusion v2 allows the limiting mechanism 50 and the slider 40 to work effectively in a limited space, which helps to maintain the compact appearance of the electric pencil sharpener. Moreover, the interaction between the protrusions v1 and v2 provides a stable mechanical connection, reduces displacement caused by vibration or accidental collision, and enhances the stability of the entire pencil sharpener structure.
[0079] Further preferably, the hob fixing seat 20 is provided with a fixing cover 60, which encloses the micro switch 30, the slider 40 and the limit mechanism 50, and the fixing cover 60 is provided with two through holes p respectively aligned with the pen feeding hole 11 and the pen feeding channel 21. The fixing cover 60 protects the micro switch, the slider and the limit mechanism from dust, moisture and other pollutants that may affect the performance, and helps to maintain the long-term stable operation of the device.
[0080] like Figures 10 to 12 As shown, sliding rails g2 are provided on both sides of the push portion 42 of the slider 40. Correspondingly, two guide protrusions g1 are symmetrically distributed on the hob fixing seat 20. The guide protrusions g1 are placed in the sliding rails g2 to guide the slider 40 to slide along a predetermined track without separation or deviation.
[0081] The cooperation between the sliding track g2 and the guide protrusion g1 ensures the accuracy of the slider 40 during movement, preventing any deviation from the predetermined track, thereby improving the accuracy and consistency of pencil sharpening. This guide mechanism ensures the stability of the slider 40 during movement by limiting its movement direction, reducing deviation or jamming caused by vibration or accidental collision.
[0082] In addition, the design of the slide rail g2 and the guide protrusion g1 reduces the friction between the slider 40 and the hob holder 20, thereby reducing wear and extending the service life of the components. The symmetrically distributed guide protrusions g1 simplify the assembly process because they provide a clear reference point to ensure that the slider 40 can be correctly installed in the predetermined position.
[0083] In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or the directions or positional relationships in which the utility model product is usually placed when in use, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. "First" and "second" are only for the purpose of making the description easier to understand, without any other directional meaning, and cannot be used as a limitation on the present utility model.
[0084] The above is an introduction to the pre-start safety protection device of the electric pencil sharpener provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the utility model and its core ideas. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.
Claims
1. The pre-start safety protection device of the electric pencil sharpener is characterized by: It includes a top cover with a pen feeding hole, a micro switch installed on a roller cutter fixing seat, a slider and a limit mechanism; the micro switch can start the motor; The roller cutter fixing seat is provided with a pen feeding channel corresponding to the pen feeding hole; the top cover includes a top wall and a peripheral side wall; The slider includes a blocking member extending into the pen feeding channel and a pushing portion contacting with a spring sheet of a micro switch; the slider can slide between a first position and a second position on the roller fixing seat; the spring sheet of the micro switch elastically keeps the slider in the first position; The limiting mechanism comprises a lower elastic member and an upper limiting member; the limiting member comprises a vertical main body and a limiting portion provided on one side of the vertical main body; the limiting portion limits the slider to be in the first position; The top wall of the top cover presses down the vertical body, and the limit part on the vertical body moves downward away from the push part; when a pencil is inserted into the pen feeding channel and presses the blocking member, the slider can slide linearly from the first position to the second position, and the push part presses the spring to trigger the micro switch, and the motor starts; When the top cover is opened, the elastic member pushes the vertical body upward, and the limiting portion on the vertical body keeps the slider in the first position; the blocking member entering the pen feeding channel can prevent the pencil from being inserted.
2. The pre-start safety protection device of the electric pencil sharpener according to claim 1, characterized in that: The blocking member extends along the direction of the pen feeding channel, and the front surface has a guiding curvature.
3. The pre-start safety protection device of the electric pencil sharpener according to claim 1, characterized in that: A notch is provided at the entrance of the pen feeding channel for the blocking member to enter and exit.
4. The pre-start safety protection device for the electric pencil sharpener according to claim 1, characterized in that: The hob fixing seat is provided with a concave hole, the elastic member and the limiting member are arranged in the concave hole, and the limiting part is a first protrusion arranged on one side of the vertical body; The pushing portion includes a pushing body and a second protrusion on one side; When the top cover is opened, the limiting member rises under the elastic force of the elastic member, and the first protrusion blocks the second protrusion; the slider is limited to the first position; When the top cover is closed, the limiting member is pressed downward, the first protrusion descends and leaves the second protrusion, and the sliding block can be moved to the second position.
5. The pre-start safety protection device for the electric pencil sharpener according to claim 1, characterized in that: The roller cutter fixing seat is provided with a fixing cover, which seals the micro switch, the slider and the limiting mechanism. The fixing cover is provided with two through holes which are respectively aligned with the pen feeding hole and the pen feeding channel.
6. The pre-start safety protection device of the electric pencil sharpener is characterized by: It includes a top cover with a pen feeding hole, a micro switch installed on a hob fixing seat, a slider and a limit mechanism; the micro switch controls the motor to start and stop; The top cover is arranged on the upper side of the roller cutter fixing seat, and the pen feeding channel on the roller cutter fixing seat corresponds to the pen feeding hole; The slider includes a blocking member extending to the path of the pen feeding channel and a pushing portion contacting with the spring of the micro switch; The limiting mechanism is arranged at one side of the pushing part and is controlled by the top cover; when the top cover is opened and away from the limiting mechanism, the limiting mechanism locks the slider to prevent the slider from sliding; when the top cover covers and presses the limiting mechanism, the limiting mechanism is unlocked, the blocking member is acted upon by an external force, and the slider moves from the first position on the hob fixing seat to the second position to trigger the micro switch; After the external force on the blocking member is removed, the elastic force of the spring of the micro switch can reset the slider from the second position to the first position.
7. The pre-start safety protection device for the electric pencil sharpener according to claim 6, characterized in that: The limiting mechanism includes a lower elastic member and an upper limiting member; the limiting member includes a vertical main body and a limiting portion arranged on one side of the vertical main body; In the unlocked state, the top wall of the top cover presses down the vertical body and compresses the elastic member, and the limiting portion on the vertical body moves downward to disengage from the limiting position of the pushing portion; In the locked state, the top cover is opened, the resilience of the elastic member causes the vertical body to return upward, and the limiting portion locks the push portion in the first position.
8. The pre-start safety protection device for an electric pencil sharpener according to claim 6, characterized in that: The blocking member extends along the direction of the pen-feeding channel, and the front surface has a guiding arc; a notch for the blocking member to enter and exit is arranged at the entrance of the pen-feeding channel.
9. The pre-start safety protection device for an electric pencil sharpener according to claim 6, characterized in that: The roller cutter fixing seat is provided with a fixing cover, which seals the micro switch, the slider and the limiting mechanism. The fixing cover is provided with a through hole aligned with the pen feeding hole and the pen feeding channel.
10. The pre-start safety protection device of the electric pencil sharpener is characterized by: The utility model comprises a top cover provided with a pen feeding hole, a micro switch installed on a roller cutter fixing seat, a slider and a limit mechanism; the micro switch controls the opening and closing of the motor; the slider comprises a blocking member extending into the pen feeding channel and a pushing part contacting with the spring of the micro switch The top cover is arranged on the upper side of the roller cutter fixing seat, and the pen feeding channel on the roller cutter fixing seat corresponds to the pen feeding hole; At least a part of the slider is distributed on the pen feeding channel, and the slider can move from a first position on the roller cutter fixing seat to a second position to trigger the micro switch; the elastic force of the spring of the micro switch can reset the slider at the second position to the first position; The limiting mechanism comprises a lower elastic member and an upper limiting member; the limiting member comprises a vertical main body and a limiting portion provided on one side of the vertical main body; the limiting portion limits the slider to be in the first position; When the top cover is closed, the top wall of the top cover presses down the vertical body, and the limiting portion on the vertical body moves downward to break away from the restriction on the slider; When a pencil is inserted into the pen-feeding channel and the slider is pressed, the slider moves until it presses the micro switch spring, and the motor starts; When the top cover is opened, the elastic member pushes the vertical body upward, and the limiting portion on the vertical body locks the slider in the first position to prevent objects from entering the pen feeding channel.
11. The pre-start safety protection device for an electric pencil sharpener according to claim 10, characterized in that: The slider includes a blocking member extending into the pen feeding channel and a pushing portion contacting with a spring of the micro switch; The blocking member extends along the direction of the pen feeding channel, and the front surface has a guiding curvature; A notch is provided at the entrance of the pen feeding channel for the blocking member to enter and exit.
12. The pre-start safety protection device for an electric pencil sharpener according to claim 10, characterized in that: The roller cutter fixing seat is provided with a fixing cover, which seals the micro switch, the slider and the limiting mechanism. The fixing cover is provided with two through holes which are respectively aligned with the pen feeding hole and the pen feeding channel.
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