Electric pencil sharpener having protection mechanism

Abstract

An electric pencil sharpener having a protection mechanism, said pencil sharpener comprising a pencil sharpening execution assembly, a signal line, a foreign object sensing assembly, and a signal processing assembly. When a pencil is inserted into a pencil inlet (7), the foreign object sensing assembly generates a normal signal and sends the normal signal to the signal processing assembly by means of the signal line, and the signal processing assembly drives the pencil sharpening execution assembly to operate. When a foreign object is inserted into the pencil inlet, the foreign object sensing assembly generates an abnormal signal and sends the abnormal signal to the signal processing assembly by means of the signal line, and the signal processing assembly stops the pencil sharpening execution assembly from operating. The electric pencil sharpener is simple in principle and structure. A finger or a hard metal object is automatically recognized after entering a pencil inlet area and the pencil sharpener is prevented from starting, thereby solving the problem of safety of existing electric pencil sharpeners.

Description

Electric pencil sharpener with protective mechanism

[0001] This application claims the benefit of Chinese Patent Application No. 202323058443.X filed on November 13, 2023, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0002] This patent relates to the field of pencil sharpeners, and in particular to an electric pencil sharpener with a protective mechanism. Background Art

[0003] Electric pencil sharpeners are becoming increasingly common. These sharpeners typically feature a pen entry area or mechanism, with an automatic trigger mechanism located at the entry hole. This trigger mechanism activates the entry switch, turning on the power and starting the sharpener. The basic operation involves manually inserting a pencil into the entry hole. The sharpener automatically switches on power and starts operating. The power transmission mechanism drives the sharpening blade to rotate, and the pencil is then fed into the cutting area by hand or a power device, driving the feed and retract mechanisms. Once the pencil is cut, the pencil is automatically withdrawn by hand or by the retract mechanism.

[0004] Existing pencil sharpeners typically have a pen hole larger than 4 mm and lack safety features (typically, only safety warnings or markings). This allows fingers or other hard metal objects to be inserted into the pen hole. This triggers the switch, automatically activating the sharpener and starting the cutting process. This can easily injure fingers, cause accidents, or damage the sharpener. This safety hazard is particularly significant for elderly people and children who may not recognize safety warnings or markings.

[0005] There is an urgent need for a pencil sharpener with a safety protection structure at the pen entry area, which can automatically identify and prohibit the pencil sharpener from starting when a finger or a hard metal object enters the pen entry area, so as to solve the existing safety problems of current electric pencil sharpeners.

[0006] Utility Model Content

[0007] In order to solve the existing safety issues of electric pencil sharpeners, this patent provides the following technical solutions:

[0008] The first aspect: provides an electric pencil sharpener with a protective mechanism, comprising a pencil sharpening execution component, a foreign object sensing component and a signal processing component, wherein the pencil sharpening execution component has a pencil sharpening opening; the foreign object sensing component is arranged on the outside of the pencil sharpening opening, the foreign object sensing component has a pen entry corresponding to the pencil sharpening opening, and a signal circuit is provided between the foreign object sensing component and the signal processing component. When a pencil is inserted into the pen entry, the foreign object sensing component generates a normal signal and sends it to the signal processing component through the signal circuit, and the signal processing component drives the pencil sharpening execution component to operate; when a foreign object is inserted into the pen entry, the foreign object sensing component generates an abnormal signal and sends it to the signal processing component through the signal circuit, and the signal processing component stops the operation of the pencil sharpening execution component.

[0009] Furthermore, the pencil sharpening execution assembly includes a motor, a transmission mechanism and a tool holder assembly. The transmission mechanism is arranged between the motor and the tool holder assembly and plays a deceleration role.

[0010] Furthermore, the foreign body sensing component includes a sensor and a micro switch, the micro switch includes a connecting rod and a switch, the connecting rod is located near the pen input port, and the foreign body sensor is located near the pen input port.

[0011] Furthermore, the signal circuit includes a switch wire and an abnormal signal wire, the switch wire connects the switch and the control board, and the abnormal signal wire connects the foreign object sensor and the control board.

[0012] Furthermore, the electric pencil sharpener further comprises a power supply, which is connected to the control board via a power line, and the motor is connected to the control board via a motor line.

[0013] Furthermore, the foreign object sensor is used to sense the material properties of the foreign object and generate a corresponding signal. The foreign object includes human tissue and / or metal. The contact surface between the foreign object sensor and the foreign object is a metal material and / or a non-metal material. The non-metal material includes conductive glue, conductive coating, conductive glass or conductive fiber.

[0014] Furthermore, the foreign body sensor includes a human tissue sensor and / or a metal sensor.

[0015] Furthermore, the human tissue sensor includes a body temperature sensor and / or an infrared sensor.

[0016] Furthermore, the metal sensor includes one or more combinations of electric sensors, thermal sensors, and magnetic sensors.

[0017] Furthermore, the pen entry opening is arranged in the pen entry area, and the pen entry area is an area above the pen sharpening opening with a diameter of 0-50mm and a height of 0-50mm.

[0018] This patent has the following beneficial effects:

[0019] Utilizing the principle that fingers and metal objects can conduct electricity or provide sensing signals, while pencils, made of wood, cannot, a finger and / or metal foreign body sensor is installed in the pen entry area. When a finger or metal object contacts or approaches the foreign body sensor, the foreign body sensor transmits the sensed signal to the signal processing component via a signal transmission component. After the signal processing component receives and processes the signal, it automatically powers off the pencil sharpening component without activating the tool holder component, thereby achieving safety protection. When a pencil approaches, no signal is sensed, and the pencil sharpening component is activated to sharpen the pencil. The electric pencil sharpener can simultaneously detect the presence of both human and metal objects, preventing accidental injury to both the consumer and the tool. This simple principle and structure, low cost, and reliable stability effectively address potential safety issues associated with electric pencil sharpeners. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of this patent, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of this patent and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a schematic diagram of the internal structure of the electric pencil sharpener of the present invention;

[0022] Figure 2 is a schematic diagram of a foreign body sensor of the present invention;

[0023] Figure 3 is a schematic diagram of the circuit connection of the utility model;

[0024] FIG4 is a schematic diagram of a signal processing component of the present invention;

[0025] FIG5 is a schematic diagram of the pen entry area of ​​the present invention;

[0026] Figure 6 is a schematic diagram of the power supply structure of the utility model;

[0027] FIG7 is a schematic diagram of the working state of the electric pencil sharpener of the present invention.

[0028] The description of the accompanying drawings is as follows:

[0029] 1: Control panel

[0030] 2: Motor

[0031] 3: Pen sharpening port 3.

[0032] 4: Transmission mechanism 4,

[0033] 5: Tool holder assembly 5,

[0034] 6: Power supply 6,

[0035] 7: Pen tip 7,

[0036] 8: Pen entry area 8,

[0037] 9: Foreign object sensor 9,

[0038] 10: Connecting rod 10,

[0039] 11: Switch 11,

[0040] 12: Motor wire 12,

[0041] 13: Power supply wire 13,

[0042] 14: Switch wire 14,

[0043] 15: Abnormal signal wire. DETAILED DESCRIPTION

[0044] The detailed features and advantages of this patent are described in detail below in the specific implementation method. The content is sufficient to enable any technical personnel in this field to understand the technical content of this patent and implement it accordingly. Based on the description, claims and drawings disclosed in this specification, technical personnel in this field can easily understand the relevant purposes and advantages of this patent.

[0045] In order to make the purpose, technical solutions and advantages of this patent clearer, the implementation methods of this patent will be further described in detail below with reference to the accompanying drawings.

[0046] The electric pencil sharpener shown in Figures 1 to 7 includes a control board 1, a motor 2, a pencil sharpening port 3, a transmission mechanism 4, a blade holder assembly 5, a power supply 6, a pen entry port 7, a pen entry area 8, a foreign object sensor 9, a connecting rod 10, a switch 11, a motor wire 12, a power wire 13, a switch wire 14, and an abnormal signal wire 15.

[0047] The entire sharpening assembly is located below the pen entry area 8. From top to bottom, the components are: the sharpening opening 3, the blade holder assembly 5, the transmission mechanism 4, and the motor 2. The foreign object sensor assembly is located at the top of the electric pencil sharpener. The pen entry 7 and the foreign object sensor 9 are located on the same component and connected to the switch 11 via a connecting rod 10. The pen entry 7 is adjustable within the pen entry area 8. The control board 1 is located below the sharpener, near the motor 2, and consists of multiple signal processing chips.

[0048] The normal signal transmission path is: a pencil is inserted into the pen inlet 7, the pen tip touches the connecting rod 10, the foreign object sensing component generates a normal signal after induction, the normal signal enters the switch wire 14 through the connecting rod 10 and the switch 11, and then the switch wire 14 transmits the normal signal to the motor 2, the motor 2 transmits the normal signal to the motor wire 12, the motor wire 12 transmits the normal signal to the power supply 6, and the normal signal is transmitted back through the power wire 13 until a closed loop is formed. At this time, the electric pencil sharpener starts working.

[0049] The abnormal signal transmission path is as follows: when a foreign object is inserted into the pen inlet 7, the foreign object sensing component generates an abnormal signal after sensing, and the abnormal signal enters the control board 1 through the abnormal signal wire 15 and generates a stop signal. The stop signal is transmitted from the control board 1 to the power supply 6 through the power wire 13, and the electric pencil sharpener stops working at this time.

[0050] The working principle of the electric pencil sharpener in the embodiment is as follows: when a pencil is inserted into the pen inlet 7, the pencil tip will first contact the foreign object sensing component and push the connecting rod 10 toward the switch 11. The switch 11 is under pressure. Since the pencil is made of wood and does not conduct electricity, it will not generate induction sources such as conductivity and magnetic field that can be generated by metals, nor will it generate induction sources such as heat, body temperature or infrared of the human body. Therefore, it cannot trigger the control board 1 to send a power-off signal to the power supply 6, so the motor 2 can be powered to perform the pencil sharpening action.

[0051] If a finger or a metal object enters the pen inlet 7 and contacts the foreign object sensing component, since the finger or metal object is a conductor, the finger can generate conductive and inductive sources similar to the heat, body temperature or infrared of the human body, and the metal can generate conductive, magnetic field and other inductive sources, which can trigger the control board 1 to send a power-off signal to the power supply 6. Therefore, the motor 2 that is powered off cannot perform the pencil sharpening action, thereby playing a safety protection role.

[0052] In the specification of the present invention, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used for illustrative purposes only and are based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite or aligned with the direction of gravity.

[0053] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, this patent will not further describe various possible combinations.

[0054] In addition, the various implementation methods of this patent can be arbitrarily combined, as long as they do not violate the concept of this patent, they should also be regarded as the content disclosed by this patent.

Claims

1. An electric pencil sharpener with a protective mechanism, characterized in that: Including pencil sharpening execution component, foreign body sensing component and signal processing component, The pencil sharpening execution component has a pencil sharpening opening (3); The foreign body sensing component is arranged outside the pencil sharpening opening (3), and the foreign body sensing component has a pen entry opening (7) corresponding to the pencil sharpening opening (3). There is a signal line between the foreign body sensing component and the signal processing component. When a pencil is inserted into the pen inlet (7), the foreign body sensing component generates a normal signal and sends it to the signal processing component through the signal line, and the signal processing component drives the pencil sharpening execution component to operate; When a foreign object is inserted into the pen inlet (7), the foreign object sensing component generates an abnormal signal and sends it to the signal processing component through the signal line, and the signal processing component stops the operation of the pen sharpening execution component.

2. The electric pencil sharpener according to claim 1, characterized in that: The pencil sharpening execution assembly comprises a motor (2), a transmission mechanism (4) and a tool holder assembly (5); the transmission mechanism (4) is arranged between the motor (2) and the tool holder assembly (5) and plays a deceleration role.

3. The electric pencil sharpener according to claim 2, characterized in that: The foreign body sensing component comprises a foreign body sensor (9) and a micro switch, the micro switch comprises a connecting rod (10) and a switch (11), the connecting rod (10) is located near the pen inlet (7), and the foreign body sensor (9) is located near the pen inlet (7).

4. The electric pencil sharpener according to claim 3, characterized in that: The signal processing component comprises a control board (1), the signal circuit comprises a switch wire (14) and an abnormal signal wire (15), the switch wire (14) connects the switch (11) and the control board (1), and the abnormal signal wire (15) connects the foreign object sensor (9) and the control board (1).

5. The electric pencil sharpener according to claim 4, characterized in that: The electric pencil sharpener further comprises a power supply (6), wherein the power supply (6) is connected to the control board (1) via a power supply wire (13), and the motor (2) is connected to the control board (1) via a motor wire (12).

6. The electric pencil sharpener according to claim 4, characterized in that: The foreign body sensor (9) is used to sense the material properties of the foreign body and generate a corresponding signal. The foreign body includes human tissue and / or metal. The contact surface between the foreign body sensor (9) and the foreign body is a metal material and / or a non-metal material. The non-metal material includes a conductive glue, a conductive coating, a conductive glass or a conductive fiber.

7. The electric pencil sharpener according to claim 6, characterized in that: The foreign body sensor (9) comprises a human tissue sensor and / or a metal sensor.

8. The electric pencil sharpener according to claim 7, characterized in that: The human tissue sensor includes a body temperature sensor and / or an infrared sensor.

9. The electric pencil sharpener according to claim 7, characterized in that: The metal sensor includes one or more combinations of electric sensors, thermal sensors, and magnetic sensors.

10. The electric pencil sharpener according to claim 1, characterized in that: The pen entry opening (7) is arranged in a pen entry area (8), and the pen entry area (8) is an area above the pen sharpening opening (3) with a diameter of 0-50 mm and a height of 0-50 mm.

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