Automatic in-and-out-pen structure of electric pencil sharpener

Abstract

The utility model discloses an automatic in-out pen structure of electric pencil sharpener, including knife rest, drive motor, rotation gear, transmission shaft and control subassembly of control drive motor rotation direction, be provided with the pencil entrance of pencil sharpener and the pencil outlet of pencil core exposure knife rest for pencil to enter the knife rest on the knife rest, be provided with the in-out pen mechanism at the pencil entrance, the in-out pen mechanism is cooperated with the knife rest to carry out the pencil work of going in and going out through the positive and negative rotation of itself, transmission shaft is movable with rotation gear and the knife rest cooperation, and transmission rotation force is transmitted, the activity path of transmission shaft and the activity path of pencil core exposure knife rest intersect, and the transmission shaft activity is driven by pencil core exposure, and then triggers control subassembly to change drive motor rotation direction. Make transmission shaft's position change can accurately reflect the exposure situation of pencil core, and control module can accurate control drive motor's rotation direction and working time according to the position information of transmission shaft, and then accurate control goes in and goes out pencil time.

Description

Technical Field

[0001] This utility model relates to the field of pencil sharpener manufacturing and design, and more specifically, to the automatic pencil feeding and discharging structure of an electric pencil sharpener. Background Technology

[0002] With the continuous development of the stationery market and the increasing demand for convenient writing tools, electric pencil sharpeners, with their significant advantages of efficiency and convenience, have rapidly gained an important position in various scenarios, becoming a common tool in schools, offices, art studios, and other places. Compared to traditional manual pencil sharpeners, electric pencil sharpeners automate the pencil sharpening process by using a motor to drive the blade holder, greatly saving users' time and effort and improving pencil sharpening efficiency.

[0003] The automatic pencil advance and retraction function is an important innovation in the development of electric pencil sharpeners. It is closely related to and complements electric pencil sharpeners. It makes the operation of electric pencil sharpeners more intelligent and user-friendly. Users do not need to manually insert and remove the pencil from the blade holder. They only need to place the pencil in the designated position, and the electric pencil sharpener can automatically complete the entire process of pencil advance, sharpening, and retraction. This function further enhances the convenience of pencil sharpening.

[0004] The timing of the pencil's forward and backward strokes is closely linked to the sharpening time, and a delicate balance must be struck between the two. If the forward and backward strokes are too long, the entire sharpening process becomes tedious and cumbersome; conversely, if the forward and backward strokes are too short, the pencil will start retracting before it has been sharpened to the desired state, thus affecting the writing experience. Furthermore, some electric pencil sharpeners on the market currently use a fixed sharpening time design, which cannot be flexibly adjusted according to the actual condition of the pencil. Different types of pencils, such as brand new, unsharpened pencils and partially sharpened pencils, require significantly different sharpening times. If all are sharpened according to a uniform time, brand new pencils may not be sufficiently sharpened, resulting in a less-than-sharp tip, requiring users to sharpen again to meet their needs, wasting time and effort; while already sharpened pencils may be over-sharpened, causing lead breakage or wasting the pencil, increasing usage costs.

[0005] In conclusion, the market urgently needs an electric pencil sharpener that can accurately control the advance and retreat time of the pencil, adapt to different pencil conditions, and is reasonably priced, in order to meet the growing needs of users. Utility Model Content

[0006] This utility model overcomes the shortcomings of the prior art and provides an automatic pen feeding and discharging structure for an electric pencil sharpener that is simple in structure, reasonable in design, accurately controls the pen feeding and discharging time, and adapts to pencils in different states.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: An electric pencil sharpener features an automatic pencil feeding and discharging mechanism. The electric pencil sharpener includes a mounting base and a blade holder and drive motor mounted on the mounting base. A transmission component is provided between the blade holder and the drive motor to transmit the motor's driving force. The electric pencil sharpener also includes a control module that controls the operating state of the drive motor. The blade holder has a sharpening inlet for pencils to enter the blade holder and a sharpening outlet for pencil leads to emerge from the blade holder. A pencil feeding and discharging mechanism is provided at the sharpening inlet. The blade holder cooperates with the pencil feeding and discharging mechanism, and its forward and reverse rotation drives the mechanism to feed and retract pencils. The control module includes a control component that controls the rotation direction of the drive motor. The transmission component includes a rotating gear and a transmission shaft. The transmission shaft movably cooperates with the rotating gear and the blade holder, transmitting rotational force. The movement path of the transmission shaft intersects with the movement path of the pencil lead emerging from the blade holder. The emergence of the pencil lead causes the transmission shaft to move, triggering the control component to change the rotation direction of the drive motor.

[0008] Furthermore, the direction of movement of the drive shaft corresponds to its axial direction; a first mating part is provided on the drive shaft along its axial direction; a through hole is provided at the center point of the rotating gear for the drive shaft to pass through, and a second mating part is provided at the through hole to mate with the first mating part; a connecting part is provided at the tool holder corresponding to the sharpening tip outlet, and a connecting space is provided inside the connecting part, which communicates with the inside of the tool holder through the sharpening tip outlet; one end of the drive shaft is located in the connecting space, and a third mating part is provided in the connecting space to mate with the first mating part; the length of the drive shaft's movement path is less than the depth of the connecting space, and the first mating part is always in a mating state with the third mating part.

[0009] Furthermore, the control module includes a switching component, which comprises a switching gear, a gear mounting shaft, and a switching rack; a mounting plate is fixedly mounted on the mounting base, and the switching rack is movably mounted on the mounting plate; the gear mounting shaft is rotatably mounted on the mounting base and / or the mounting plate; the switching gear includes a first switching gear and a second switching gear mounted on the gear mounting shaft; the first switching gear and the switching rack mesh with each other; a mating tooth is provided at the end of the drive shaft away from the tool holder, arranged circumferentially thereon, and the second switching gear is located on the moving path of the mating tooth; the drive shaft drives the gear mounting shaft and the first switching gear to rotate through the engagement of the mating tooth and the second switching gear; the switching rack engages with the control component and triggers the control component through its own movement to switch the rotation direction of the drive motor.

[0010] Furthermore, the transmission assembly includes a transmission gear that meshes with a drive motor and a rotating gear; the transmission gear and the rotating gear are assembled within a mounting base; the switching assembly and the mounting plate are assembled outside the mounting base and are located on the side of the mounting base away from the tool holder; the mounting base has an assembly space that communicates with the through hole and connection space of the rotating gear, and the transmission shaft is disposed within the assembly space; the mounting base also has an opening for one end of the transmission shaft with mating teeth to protrude from the assembly space and mesh with the second switching gear; a limiting block with a diameter larger than the inner diameter of the opening is also provided on the portion of the transmission shaft located within the assembly space.

[0011] Furthermore, it includes an adjustment mechanism, which includes an adjustment knob for adjusting the position of the second switching gear; both ends of the gear mounting shaft are rotatably connected to the mounting base and the mounting plate, respectively, and the gear mounting shaft can move along its own axial direction; the adjustment knob is rotatably mounted on the mounting plate; one end of the gear mounting shaft passes through the mounting plate, and the inner surface of the adjustment knob is provided with an inclined contact surface that mates with the gear mounting shaft.

[0012] Furthermore, a return spring is fitted on the gear mounting shaft, with its two ends abutting against the mounting base and the surface of the second switching gear facing the mounting base, respectively.

[0013] Furthermore, it includes a reset mechanism that drives the drive shaft to reset. The reset mechanism includes a reset rod and a reset switch. The reset rod is connected to the drive shaft, and the reset switch cooperates with the reset rod to push the drive shaft toward the tool holder.

[0014] Furthermore, the switching assembly includes a reset post and a reset spring; both the switching rack and the mounting plate are provided with reset posts, and the two ends of the reset spring cooperate with the reset posts on the switching rack and the mounting plate, respectively.

[0015] Furthermore, the pen feeding and discharging mechanism includes a vortex that cooperates with and rotates with the tool holder, as well as a first rotating shaft and a second rotating shaft that cooperate with the vortex; the surface of the vortex is provided with a vortex rack distributed in a turbine shape and in the form of arc segments, and the first rotating shaft and the second rotating shaft are provided with impellers that mesh with the vortex rack; the rotation of the vortex drives the first rotating shaft and the second rotating shaft to rotate, the forward rotation of the vortex drives the two shafts to rotate inward to feed the pen, and the reverse rotation of the vortex drives the two shafts to rotate outward to discharge the pen. Beneficial effects

[0016] In this invention, a pencil-feeding and retracting mechanism is provided at the pencil-sharpening inlet of the blade holder. The blade holder drives the pencil-feeding and retracting mechanism to perform the pencil-feeding and retracting work by rotating forward and backward. Users only need to place the pencil in the designated position, and the electric pencil sharpener can automatically complete the entire process of pencil feeding, sharpening, and retracting without the need to manually insert and remove the pencil, which greatly improves the convenience of operation.

[0017] In this invention, the drive shaft movably cooperates with the rotating gear and the blade holder to transmit rotational force, and the movement path of the drive shaft intersects with the movement path of the lead protruding from the blade holder. The control component is located on the movement path of the drive shaft. This allows changes in the position of the drive shaft to accurately reflect the protrusion of the lead. The control module can precisely control the rotation direction and working time of the drive motor based on the position information of the drive shaft, thereby accurately controlling the timing of the lead retraction. This ensures the accuracy of the lead retraction timing as much as possible, avoiding problems caused by retraction too early or too late, further improving ease of use and the sharpening effect. Furthermore, since the drive shaft is only triggered when the lead protrudes to a certain extent from the blade holder, the triggering of the lead retraction action in this invention is determined by the state of the pencil. This better adapts to the sharpening needs of pencils in different states, avoiding problems such as insufficient sharpening of brand-new pencils or over-sharpening of already sharpened pencils.

[0018] In this invention, a through hole is provided at the center point of the rotating gear for the drive shaft to pass through, and the second mating part is disposed at this through hole. This design ensures that the mating position between the drive shaft and the rotating gear is at the center of the rotating gear, enabling stable power transmission to the drive shaft when the rotating gear rotates. The arrangement of the connecting part and the connecting space further stabilizes the fit and power transmission between the drive shaft and the tool holder.

[0019] In this invention, since the length of the drive shaft's active path is less than the depth of the connecting space, and the first mating part is always in a mating state with the third mating part, it is ensured that the drive shaft can stably transmit power to the tool holder throughout the entire process of sharpening and retracting the pen. Problems such as abnormal rotation of the tool holder or failure to retract the pen due to loosening or disengagement of the mating will not occur, thus ensuring the continuity and stability of the pen sharpening and retracting functions.

[0020] In this invention, a mating tooth located at the end of the drive shaft away from the blade holder engages with a second switching gear. When the pencil lead protrudes from the blade holder, it pushes the drive shaft to engage the mating tooth with the second switching gear. The drive shaft then drives the second switching gear, the gear mounting shaft, and the first switching gear to rotate, converting the rotational motion into linear motion of the switching rack. Finally, the switching rack triggers the control component, causing it to switch the rotation direction of the drive motor. This precise transmission and triggering mechanism ensures that the electric pencil sharpener can accurately control the forward and reverse rotation of the drive motor according to different stages of pencil sharpening, thereby achieving automatic pencil advance and retraction, providing users with a convenient and efficient user experience.

[0021] In this invention, the movement of the transmission shaft is restricted by the setting of the limiting block, which further prevents the first mating part and the third mating part from disengaging.

[0022] In this invention, when the adjustment knob is rotated, the inclined contact surface will move relative to the gear mounting shaft. Due to the special design of the inclined contact surface, the gear mounting shaft can move precisely along its own axial direction, thereby achieving precise adjustment of the position of the second switching gear; thereby changing the meshing position of the second switching gear and the mating teeth to control the length of the transmission shaft to move, so as to accurately determine the length of the pencil lead protruding from the blade holder, thus enabling the electric pencil sharpener to adjust the thickness of the pencil cut.

[0023] In this invention, a return spring is also fitted on the gear mounting shaft. The two ends of the return spring abut against the mounting base and the surface of the second switching gear facing the mounting base, respectively. Then, after the adjustment knob is reset, the second switching gear is reset under the support of the return spring.

[0024] In this invention, the reset rod in the reset mechanism is connected to the drive shaft, and the reset switch works with the reset rod to push the drive shaft toward the tool holder. After the electric pencil sharpener completes operations such as sharpening or retracting the pencil, the user triggers the reset switch to cause the reset rod to drive the drive shaft back to its initial position, preparing for the next normal operation.

[0025] In this invention, the motor reverses by combining the force output by the motor with the cooperation between the transmission shaft and the switching assembly. After the retraction is complete and the motor stops outputting force, the reset pin and the reset spring provide a stable reset force for the switching rack. The switching rack is pulled back to the initial position along the original path, so that the switching switch is accurately reset to the corresponding control position, and the next switching action can be performed accurately and reliably.

[0026] In this invention, mechanical structures such as a vortex, a rotating shaft, a rack, and an impeller are used to achieve the automatic pen advance and retraction function. Compared with some methods that use a combination of sensors and circuit chips to achieve automatic pen advance and retraction, this design avoids complex circuit design and programming. The mechanical structure not only improves the stability and reliability of use, but also reduces the overall cost of the electric pencil sharpener compared to high-cost components such as sensors and circuit chips. Attached Figure Description

[0027] Figure 1 This is a structural diagram of an electric pencil sharpener.

[0028] Figure 2 for Figure 1 Cross-sectional view.

[0029] Figure 3 for Figure 1 Structural diagram without tool holder cover.

[0030] Figure 4 This is a cross-sectional view of the pen case.

[0031] Figure 5 This is a structural diagram of the first area inside the pen box.

[0032] Figure 6 This is a structural diagram of the second area inside the pen box.

[0033] Figure 7 This is a structural diagram showing the connection between the vortex, the first rotating shaft, and the second rotating shaft.

[0034] Figure 8 This is a structural diagram showing the coordination of the tool holder, mounting base, control components, and switching components.

[0035] Figure 9 This is a cross-sectional view of the interface between the inversion trigger component, the switching component, and the tool holder.

[0036] Figure 10 This is a structural diagram of the drive shaft.

[0037] Figure 11 This is a structural diagram of the tool holder.

[0038] Figure 12 This is a structural diagram of a rotating gear.

[0039] Figure 13 This is a structural diagram of the connection between the start switch and the start lever.

[0040] Figure 14 This is a diagram showing the working structure of the switching component and the control component when the drive motor is rotating forward.

[0041] Figure 15 This is a diagram showing the interaction structure between the trigger rod and the control components when the drive motor rotates forward.

[0042] Figure 16 This is a diagram showing the working relationship between the switching component and the control component when the drive motor reverses.

[0043] Figure 17 for Figure 16 Structure diagram without mounting plate.

[0044] Figure 18 This is a diagram showing the interaction between the trigger lever and the control components when the drive motor reverses.

[0045] Figure 19 This is a structural diagram of the control component.

[0046] Figure 20 for Figure 19 Cross-sectional view.

[0047] Figure 21 This is a structural diagram of the adjustment knob.

[0048] Numbering on the map: 1. Mounting base; 2. Sharpening post; 3. Drive motor; 4. Pen tip feeding / ejecting mechanism; 5. Control component; 7. Forward rotation trigger component; 8. Switching component; 9. Starting component; 11. Transmission gear; 12. Rotary gear; 13. Mounting plate; 14. Assembly space; 15. Through opening; 16. Adjustment knob; 17. Adjustment switch; 18. Return spring; 21. Sharpening inlet; 22. Sharpening outlet; 23. Third mating part; 24. Connecting part; 25. Inlet 41. Pen dispenser; 42. First rotating shaft; 43. Second rotating shaft; 44. Impeller; 45. Shaft; 46. Rubber wheel; 51. Switch housing; 52. Toggle switch; 53. Forward button; 54. Reverse button; 55. Reversing snap; 61. Drive shaft; 71. Trigger rod; 72. Pen feed sensing mechanism; 81. Gear mounting shaft; 82. Switching rack; 83. First switching gear; 84. Second switching gear; 85. Reset post; 91. 92. Start switch; 100. Pen feed detection mechanism; 101. Base plate; 101. Tool holder cover; 121. Second mating part; 161. Contact surface; 241. Connecting space; 251. Pen feed opening; 252. Partition plate; 253. First area; 254. Second area; 255. Mating opening; 256. Mating through hole; 257. Assembly bracket; 258. Mounting notch; 259. Mounting bracket; 411. Scroll rack; 511. Assembly plate; 51 2. Reversing spring; 551. Assembly part; 552. Assembly through hole; 553. First abutting part; 554. Second abutting part; 611. First mating part; 612. Mating tooth; 613. Limiting block; 614. Reset rod; 721. First rotating rod; 722. Second rotating rod; 723. Actuating block; 724. Contact block; 911. Switch housing; 912. Start button; 913. Spring; 921. Start rod; 922. Start contact block. Detailed Implementation

[0049] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments are merely specific descriptions of the present invention, and their purpose is to enable those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as limitations on the present invention.

[0050] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0052] like Figure 1-21 As shown, an automatic pencil feed and discharge structure for an electric pencil sharpener is disclosed. The electric pencil sharpener includes a mounting base 1 and a blade holder 2 and a drive motor 3 mounted on the mounting base 1. A transmission component for transmitting the driving force of the motor is provided between the blade holder 2 and the drive motor 3. The electric pencil sharpener also includes a control module for controlling the working state of the drive motor 3. The blade holder 2 is provided with a sharpening inlet 21 for pencils to enter the blade holder 2 and a sharpening outlet 22 for pencil leads to exit the blade holder 2. A pencil feed and discharge mechanism 4 is provided at the sharpening inlet 21. The blade holder 2 cooperates with the pencil feed and discharge mechanism 4 and drives the pencil feed and discharge mechanism 4 to perform the pencil feed and discharge work by rotating forward and backward. The user only needs to place the pencil in the designated position, and the electric pencil sharpener can automatically complete the entire process of feeding, sharpening, and discharging the pencil without manually inserting and removing the pencil, which greatly improves the convenience of operation. The control module includes a control component 5 that controls the rotation direction of the drive motor 3; the transmission component includes a rotating gear 12 and a transmission shaft 61; the transmission shaft 61 movably engages with the rotating gear 12 and the blade holder 2, transmitting rotational force; the movement path of the transmission shaft 61 intersects with the movement path of the pen refill protruding from the blade holder 2; the pen refill protruding causes the transmission shaft 61 to move, triggering the control component 5 to change the rotation direction of the drive motor 3; based on transmitting rotational force, the transmission shaft 61 is driven to move by the force transmitted by the pen refill, thereby triggering the control component 5 to change the rotation direction of the drive motor 3. This ensures that the position change of the transmission shaft 61 accurately reflects the pen refill protrusion status, and the control module can precisely control the rotation direction and working time of the drive motor 3 based on the position information of the transmission shaft 61, thereby accurately controlling the pen advance and retraction time. This ensures the accuracy of the pen retraction timing as much as possible, avoiding problems caused by retracting the pen too early or too late, further improving the ease of use and the pen sharpening effect. Meanwhile, since the lead needs to protrude from the blade holder 2 to a certain extent before the drive shaft 61 can be activated, the triggering of the retraction action in this invention is determined by the state of the pencil; thus, it can better adapt to the sharpening needs of pencils in different states and avoid the problem of insufficient sharpening of brand-new pencils or excessive sharpening of already sharpened pencils.

[0053] In this invention, the direction of movement of the drive shaft 61 corresponds to its axial direction; a first mating part 611 is provided on the drive shaft 61 along its axial direction; a through hole for the drive shaft 61 to pass through is provided at the center point of the rotating gear 12, and a second mating part 121 that mates with the first mating part 611 is provided at the through hole; this design ensures that the mating position of the drive shaft 61 and the rotating gear 12 is at the center of the rotating gear 12, so that power can be stably transmitted to the drive shaft 61 when the rotating gear 12 rotates. A connecting part 24 is provided on the tool holder 2 corresponding to the pencil sharpening outlet 22, and a connecting space 241 is provided inside the connecting part 24. The connecting space 241 communicates with the interior of the tool holder 2 through the pencil sharpening outlet 22; one end of the drive shaft 61 is located in the connecting space 241, and a third mating part 23 that mates with the first mating part 611 is provided in the connecting space 241; the provision of the connecting part 24 and the connecting space 241 makes the mating and power transmission between the drive shaft 61 and the tool holder 2 more stable.

[0054] In this embodiment, the length of the moving path of the drive shaft 61 is less than the depth of the connecting space 241, and the first mating part 611 is always in a mating state with the third mating part 23; this ensures that the drive shaft 61 can stably transmit power to the tool holder 2 throughout the entire process of sharpening and retracting the pen, and there will be no problems such as abnormal rotation of the tool holder 2 or failure to retract the pen due to loosening or disengagement of the mating, thus ensuring the continuity and stability of the pen sharpening and retracting functions.

[0055] In this embodiment, the axial direction of the drive shaft 61 is consistent with that of the rotating gear 12, and the center points of the drive shaft 61, the rotating gear 12, and the pencil sharpening outlet 22 are on the same straight line; thus, the transmission of the drive shaft 61 is more stable. The length directions of the first mating part 611, the second mating part 121, and the third mating part 23 are consistent; the first mating part 611 is block-shaped, and both the second mating part 121 and the third mating part 23 are groove-shaped to match the first mating part 611; thus, a stable fit is achieved between the first mating part 611, the second mating part 121, and the third mating part 23.

[0056] In this utility model, the control module includes a switching component 8, which includes a switching gear, a gear mounting shaft 81, and a switching rack 82; a mounting plate 13 is fixedly mounted on the mounting base 1, and the switching rack 82 is movably mounted on the mounting plate 13; the gear mounting shaft 81 is rotatably mounted on the mounting base 1 and / or the mounting plate 13; the switching gear includes a first switching gear 83 and a second switching gear 84 mounted on the gear mounting shaft 81; the first switching gear 83 and the switching rack 82 mesh with each other; the drive shaft 61 has a mating tooth 612 arranged circumferentially at the end away from the tool holder 2, and the second switching gear 84 is located on the movement path of the mating tooth 612. The drive shaft 61 drives the gear mounting shaft 81 and the first switching gear 83 to rotate through the mating tooth 612 and the second switching gear 84; the switching rack 82 cooperates with the control component 5 and triggers the control component 5 through its own movement to switch the rotation direction of the drive motor 3. The mating teeth 612 at the end of the drive shaft 61 away from the blade holder 2 engage with the second switching gear 84. When the pencil lead protrudes from the blade holder 2, it pushes the drive shaft 61 so that the mating teeth 612 mesh with the second switching gear 84. The drive shaft 61 then drives the second switching gear 84, the gear mounting shaft 81, and the first switching gear 83 to rotate, thus converting the rotational motion into the linear motion of the switching rack 82. Finally, the switching rack 82 triggers the control component 5, causing it to switch the rotation direction of the drive motor 3. This precise transmission and triggering mechanism ensures that the electric pencil sharpener can accurately control the forward and reverse rotation of the drive motor 3 according to different stages of pencil sharpening, thereby achieving automatic pencil advance and retraction, providing users with a convenient and efficient user experience.

[0057] In this utility model, the transmission assembly includes a transmission gear 11, which cooperates with the drive motor 3 and the rotating gear 12; the transmission gear 11 and the rotating gear 12 are assembled in the mounting base 1; the switching assembly 8 and the mounting plate 13 are assembled outside the mounting base 1 and are located on the side of the mounting base 1 away from the tool holder 2; the mounting base 1 is provided with an assembly space 14, which communicates with the through hole and the connecting space 241 of the rotating gear 12, and the transmission shaft 61 is disposed in the assembly space 14; the mounting base 1 is also provided with an opening 15, allowing one end of the transmission shaft 61 with the mating teeth 612 to protrude from the assembly space 14 and cooperate with the second switching gear 84; the portion of the transmission shaft 61 located in the assembly space 14 is also provided with a limiting block 613 with a diameter larger than the inner diameter of the opening 15; the setting of the limiting block 613 restricts the movement of the transmission shaft 61, further preventing the first mating part 611 from disengaging from the third mating part 23.

[0058] In this embodiment, a drive gear is provided on the motor shaft of the drive motor 3, and the transmission gear 11 meshes with the drive gear and the rotating gear 12 to realize the transmission of the force of the drive motor 3.

[0059] This invention includes an adjustment mechanism, comprising an adjustment knob 16 for adjusting the position of the second switching gear 84; the two ends of the gear mounting shaft 81 are rotatably connected to the mounting base 1 and the mounting plate 13 respectively, and the gear mounting shaft 81 can move along its own axial direction; the adjustment knob 16 is rotatably mounted on the mounting plate 13; one end of the gear mounting shaft 81 passes through the mounting plate 13, and the inner surface of the adjustment knob 16 is provided with an inclined contact surface 161 that mates with the end of the gear mounting shaft 81; when the adjustment knob 16 is rotated, the inclined contact surface 161 will generate relative movement with the gear mounting shaft 81. Due to the special design of the inclined contact surface 161, the gear mounting shaft 81 can move precisely along its own axial direction, thereby achieving precise adjustment of the position of the second switching gear 84; thereby changing the meshing position of the second switching gear 84 and the mating teeth 612 to control the length of movement required by the transmission shaft 61, so as to accurately determine the length of the pencil lead protruding from the blade holder 2, thereby enabling the electric pencil sharpener to adjust the thickness of the pencil cut.

[0060] In this embodiment, the adjustment mechanism also includes an adjustment switch 17 that controls the rotation state of the adjustment knob 16, thereby facilitating the operation of the adjustment knob 16.

[0061] In this utility model, a return spring 18 is sleeved on the gear mounting shaft 81. The two ends of the return spring 18 abut against the mounting base 1 and the surface of the second switching gear 84 facing the mounting base 1, respectively. Then, after the adjustment knob 16 is reset, the second switching gear 84 is reset under the support of the return spring 18.

[0062] In this utility model, a reset mechanism is included to drive the transmission shaft 61 to reset. The reset mechanism includes a reset rod 614 and a reset switch. The reset rod 614 is connected to the transmission shaft 61, and the reset switch cooperates with the reset rod 614 to push the transmission shaft 61 toward the tool holder 2. After the electric pencil sharpener completes operations such as sharpening or retracting the pencil, the user triggers the reset switch to drive the reset rod 614 to return the transmission shaft 61 to its initial position, preparing for the next normal operation.

[0063] In this invention, the switching assembly 8 includes a reset post 85 and a reset spring; both the switching rack 82 and the mounting plate 13 are provided with reset posts 85, and the two ends of the reset spring respectively cooperate with the reset posts 85 on the switching rack 82 and the mounting plate 13. The electric pencil sharpener reverses the motor by combining the force output by the motor with the cooperation between the transmission shaft 61 and the switching assembly 8; when the pencil retraction is complete and the motor stops outputting force, the reset post 85 and the reset spring provide a stable reset force for the switching rack 82; pulling the switching rack 82 back to the initial position along the original path, so that the switching switch 52 is accurately reset to the corresponding control position, so that the next switching action can be performed accurately and reliably. In this invention, the pen-feeding / retracting mechanism 4 includes a vortex 41 that cooperates with and rotates with the blade holder 2, and a first rotating shaft 42 and a second rotating shaft 43 that cooperate with the vortex 41. The surface of the vortex 41 is provided with a turbine-shaped, arc-shaped vortex rack 411. The first rotating shaft 42 and the second rotating shaft 43 are provided with impellers 44 that mesh with the vortex rack 411. The rotation of the vortex 41 drives the first rotating shaft 42 and the second rotating shaft 43 to rotate. Forward rotation of the vortex 41 causes both shafts to rotate inward to feed the pen, while reverse rotation causes both shafts to rotate outward to retract the pen. The automatic pen-feeding / retracting function is achieved using a mechanical structure including the vortex 41, rotating shafts, racks, and impellers 44. Compared to some methods that combine sensors and circuit chips to achieve automatic pen-feeding / retracting, this design avoids complex circuit design and programming. The mechanical structure not only improves stability and reliability but also reduces the overall cost of the electric pencil sharpener compared to high-cost components such as sensors and circuit chips.

[0064] In this invention, the vortex 41 is fixedly connected or detachably connected via a threaded connection or other means to cooperate with the tool holder 2; the first rotating shaft 42 and the second rotating shaft 43 are parallel to each other; a through hole is provided at the center of the vortex 41, which is located between the first rotating shaft 42 and the second rotating shaft 43 and is on the same straight line as the pencil sharpening inlet 21, through which the pencil enters the tool holder 2 for cutting. The surface of the vortex 41 is provided with a turbine-shaped, arc-shaped vortex rack 411, and impellers 44 that mesh with the vortex rack 411 are provided on the first rotating shaft 42 and the second rotating shaft 43; the impellers 44 are located at different ends of the first rotating shaft 42 and the second rotating shaft 43; the teeth of the impellers 44 cooperate with the vortex rack 411 and transmit the rotational torque of the vortex 41 to the impellers 44, thereby driving the impellers 44 and the first rotating shaft 42 and the second rotating shaft 43 on which the impellers 44 are located to rotate. This allows the drive motor 3 to drive the tool holder 2 and the vortex 41 to rotate forward, simultaneously driving the first rotating shaft 42 and the second rotating shaft 43 to rotate inward to achieve pen insertion; and the drive motor 3 to drive the tool holder 2 and the vortex 41 to rotate in reverse, driving the first rotating shaft 42 and the second rotating shaft 43 to rotate outward to achieve pen output.

[0065] In this utility model, the control module includes a forward rotation triggering component 7 for triggering the control component 5 to make the drive motor 3 rotate forward; the forward rotation triggering component 7 includes a trigger rod 71 movably mounted on the mounting base 1 and a pen feeding sensing mechanism 72 that drives the trigger rod 71 to trigger the control component 5; a pen feeding box 25 is provided at the pencil sharpening inlet 21, and the pen feeding mechanism 4 and the pen feeding sensing mechanism 72 are disposed inside the pen feeding box 25; the pen feeding box 25 is provided with a pen feeding opening 251 corresponding to the pencil sharpening inlet 21; the pen feeding sensing mechanism 72 includes a rotating rod located on the pencil feeding path and a touch block 723 fixedly disposed on the rotating rod; the pencil feeding and discharging causes the rotating rod and the touch block 723 on it to rotate; one end of the trigger rod 71 is located inside the pen feeding box 25, and the movement path of the trigger rod 71 intersects with the movement path of the touch block 723; the control component 5 is located on the movement path of the trigger rod 71. When a pencil enters the pencil sharpening inlet 21 through the pencil inlet 251, it will cause the rotating rod and the trigger block 723 on it to rotate. Since the movement path of the trigger rod 71 intersects with the movement path of the trigger block 723, the trigger block 723 will push the trigger rod 71 to move during the rotation. The control component 5 is located on the movement path of the trigger rod 71. In this way, the control component 5 can be precisely triggered to make the drive motor 3 rotate in the forward direction, thereby realizing automatic pencil feeding and automatic pencil sharpening.

[0066] In this embodiment, the rotating rod is rotatably mounted on the pencil case 25. When the pencil enters the pencil sharpening inlet 21, it drives the rotating rod and the trigger block 723 on it to rotate. This mechanical sensing method is less affected by environmental factors and has higher reliability compared to some electronic sensing methods.

[0067] In this embodiment, the rotating rod includes a first rotating rod 721 and a second rotating rod 722 symmetrically arranged. A trigger block 723 is fixedly mounted on either the first rotating rod 721 or the second rotating rod 722, corresponding to the trigger rod 71. Both the first rotating rod 721 and the second rotating rod 722 are equipped with gears, and these gears mesh with each other. This gear transmission method provides stable and reliable power transmission, thereby stably transmitting force to the trigger rod 71. A passage gap is provided between the first rotating rod 721 and the second rotating rod 722 to allow the pencil to pass through and rotate both rods. Preferably, both the first rotating rod 721 and the second rotating rod 722 are equipped with toothed contact blocks 724. The passage gap is located between the contact blocks 724, which further stabilize the pencil, allowing it to move in and out more stably, and transmitting force more stably to the first rotating rod 721 and the second rotating rod 722.

[0068] In this invention, the control component 5 includes a switch housing 51 rotatably mounted on the mounting base 1 and a switch 52 fixed inside the switch housing 51 and moving therewith. A switching rack 82 is connected to the switch housing 51 and drives its rotation. A forward rotation button 53 is provided on the switch 52, and the movement path of the forward rotation button 53 intersects with the movement path of the trigger rod 71. The movement direction of the trigger rod 71 corresponds to its axial direction. When the trigger rod 71 moves along its axial direction under the action of the pen-feeding sensing mechanism 72, it accurately triggers the forward rotation button 53, thereby starting the drive motor 3 to rotate forward for pen sharpening. This minimizes the risk of abnormal forward starting of the drive motor 3 due to signal interference or misoperation, improving the reliability of the pen sharpening process. The switching component 8 can rotate the switch housing 51 according to the state or movement of the transmission shaft 61, thereby changing the position of the switch 52, causing the forward rotation button 53 to disengage from the trigger rod 71, and enabling the drive motor 3 to switch from forward to reverse rotation, completing the pen retraction function, thus achieving seamless connection between pen sharpening and pen retraction functions.

[0069] In some other configurations, the switch 52 also includes a reverse button 54; a reversing snap fastener 55 is rotatably mounted inside the switch housing 51, the reversing snap fastener 55 including an assembly part 551 and an abutment part; the assembly part 551 has an axially oriented assembly through hole 552 at its center, and the switch housing 51 also has an assembly post that mates with the assembly through hole 552, thereby enabling the rotation of the reversing snap fastener 55; the abutment part includes a first abutment part 553 and a second abutment part 554, which are axially symmetrically arranged in the assembly part 551. The outer surface of the switch housing 51 is shown. The reverse button 54 is located on the movement path of the first abutment part 553. The forward button 53 is located on the movement path of the second abutment part 554, and the movement path of the second abutment part 554 intersects with the movement path of the trigger rod 71. An assembly plate 511 is fixedly connected inside the switch housing 51, and the first abutment part 553 is located between the assembly plate 511 and the reverse button 54. A reversing spring 512 is also provided inside the switch housing 51, and the two ends of the reversing spring 512 are respectively connected and cooperated with the first abutment part 553 and the assembly plate 511. By setting the forward and reverse buttons 54, precise commands for forward or reverse rotation can be given to the drive motor 3, minimizing the ambiguity of commands during the forward and reverse conversion process of the drive motor 3. Meanwhile, since the reversing spring 512, the reversing latch 55, and the mounting plate 511 are all located inside the switch housing 51, their coordination is not affected by the rotation of the switch housing 51. Through the coordination of the reversing latch 55 and the reversing spring 512, after the second abutment 554 disengages from the trigger rod 71 when the switch housing 51 rotates, the first abutment 553 triggers the reverse button 54 under the force of the reversing spring 512, thereby reversing the drive motor 3. Preferably, the angle between the first abutment 553 and the second abutment 554 facing the surface of the switch 52 is an obtuse angle; thus avoiding the simultaneous triggering of the forward and reverse buttons 54.

[0070] In this embodiment, the switch housing 51 is connected to the mounting base 1 by a rotating shaft, thereby enabling the switch housing 51 to rotate under force.

[0071] In this invention, the control module includes a starting component 9, which comprises a start switch 91 and a pencil insertion detection mechanism 92. The pencil insertion detection mechanism 92 is disposed within the pencil case 25 to detect whether a pencil has been inserted and works in conjunction with the start switch 91 to control the start and stop states of the drive motor 3. The starting component 9 includes the pencil insertion detection mechanism 92 disposed within the pencil case 25. This mechanism can detect in real time whether a pencil has entered the pencil sharpening inlet 21. When a pencil enters, the pencil insertion detection mechanism 92 quickly senses this change and, in conjunction with the start switch 91, automatically triggers the start switch 91 to start the drive motor 3, thereby initiating the pencil insertion and sharpening process. When the pencil sharpening is complete and the pencil has been removed, or when no pencil has entered, the pencil insertion detection mechanism 92 no longer detects a pencil insertion signal, and the drive motor 3 automatically stops operating. This design achieves automated control of the pencil sharpening process, eliminating the need for manual operation of the drive motor 3 by the user, greatly improving the convenience and efficiency of use.

[0072] In this embodiment, the pencil insertion detection mechanism 92 includes an activation rod 921 and an activation contact 922. The activation contact 922 is movably mounted inside the pencil case 25. The activation switch 91 is fixedly mounted on the mounting base 1. The activation rod 921 is movably mounted on the mounting base 1, with its two ends pointing to the activation switch 91 and the activation contact 922, respectively. The movement path of the activation rod 921 corresponds to its axial direction. The movement path of the activation contact 922 intersects with the movement path of the activation rod 921 and the pencil insertion path. When the pencil enters the pencil, it drives the activation contact 922 to move, and the activation contact 922 drives the activation rod 921 to move towards the activation switch 91. This direct association design ensures that as long as a pencil enters, the activation contact 922 will produce a corresponding action, which can accurately convert the pencil insertion signal into the force of the activation rod 921 on the activation switch 91, thereby triggering the activation signal and ensuring the high accuracy of the pencil insertion detection. The start switch 91 includes a switch housing 911 and a start button 912 and a spring 913 disposed on the switch housing 911. One end of the spring 913 is connected to the switch housing 911, and the start button 912 is located at the angle between the spring 913 and the switch housing 911. The other end of the spring 913 is located on the movement path of the start lever 921. This structural design gives the start switch 91 stable triggering characteristics. When the start lever 921 moves toward the start switch 91 under the action of the start contact block 922 and presses the spring 913, the spring 913 will undergo elastic deformation, thereby stably pressing the start button 912 and triggering the device to start. When the pencil is retracted or there is no pencil in, the start contact block 922 is in the initial position and will not drive the start lever 921 to move. At the same time, the spring 913 can also drive the start lever 921 to reset, so that the start switch 91 will not be triggered, thus avoiding accidental start of the device when it is not in operation.

[0073] The electric pencil sharpener includes a base plate 100 and a housing; the mounting base 1 is fixed to the base plate 100; the housing includes a blade holder cover 101 that surrounds the blade holder 2, the trigger rod 71 and the start rod 921, thereby protecting the three components; one end of the blade holder cover 101 is fixedly connected to the mounting base 1, and the pencil case 25 is fixed to the other end of the blade holder cover 101.

[0074] In this embodiment, the pen holder 25 has an internal space, which is divided into a first region 253 and a second region 254 by a partition 252. The second region 254 is located between the knife holder cover 101 and the first region 253. The vortex 41, the first rotating shaft 42 and the second rotating shaft 43 of the pen feeding mechanism 4 are located in the second region 254. The first rotating rod 721 and the second rotating rod 722 of the pen feeding sensing mechanism 72 are located in the first region 253. The activation contact block 922 is movably located in the second region 254. The pen inlet / outlet box 25 has a mating opening 255 on its surface facing the tool holder 2, allowing the end of the vortex plate 41 away from the first rotating shaft 42 and the second rotating shaft 43 to connect to the tool holder 2; the pen inlet / outlet opening 251 is located on the surface of the pen inlet / outlet box 25 away from the tool holder 2; the partition plate 252 has a mating through hole 256 that connects the first region 253 and the second region 254; the start contact block 922 is movably mounted on the partition plate 252 and is correspondingly set to the mating through hole 256; the pen inlet / outlet opening 251, the mating through hole 256, the mating opening 255 and the pen sharpening inlet 21 are correspondingly set and are on the same straight line. A mounting bracket 257 is provided in the second region 254. The mounting bracket 257 has an installation notch 258. A partition 252 is mounted on the mounting bracket 257 to close the installation notch 258 and form an installation space. The first rotating shaft 42 and the second rotating shaft 43 both include a shaft body 45. The two ends of the shaft body 45 are rotatably located in the installation space. A rubber wheel 46 is sleeved on the shaft body 45. The rubber wheel 46 increases the friction and stably drives the pencil to move in and out of the pencil. The impeller 44 is fixed on the shaft body 45. A mounting bracket 259 is provided on the surface of the partition 252 corresponding to the first region 253. The first rotating rod 721 and the second rotating rod 722 are rotatably mounted on the mounting bracket 259. A through hole 256 is located between the first rotating shaft 42 and the second rotating shaft 43, and between the first rotating rod 721 and the second rotating rod 722.

[0075] It is worth noting that the other technical solutions of this utility model are all existing technologies, and therefore will not be described in detail.

[0076] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An automatic pen-feeding and ejecting structure for an electric pencil sharpener, comprising a mounting base and a blade holder and a drive motor mounted on the mounting base, wherein a transmission component for transmitting the motor's driving force is provided between the blade holder and the drive motor; the electric pencil sharpener further comprises a control module for controlling the operating state of the drive motor; characterized in that, The pencil holder is equipped with a sharpening inlet for the pencil to enter the holder and a sharpening outlet for the pencil lead to exit the holder. The pencil sharpener is equipped with a pencil feeding and discharging mechanism at the inlet; the sharpener works in conjunction with the pencil feeding and discharging mechanism and drives the mechanism to feed and retract the pencil by rotating forward and backward. The control module includes control components that control the rotation direction of the drive motor; The transmission assembly includes a rotating gear and a transmission shaft; the transmission shaft is movably coupled with the rotating gear and the tool holder, and transmits rotational force. The movement path of the drive shaft intersects with the movement path of the pen refill protruding from the tool holder; the protruding pen refill drives the drive shaft to move, and triggers the control component to change the rotation direction of the drive motor.

2. The automatic pen feeding and discharging structure of the electric pencil sharpener according to claim 1, characterized in that, The direction of movement of the drive shaft corresponds to its axial direction; the drive shaft is provided with a first mating part arranged along its axial direction; The center point of the rotating gear is provided with a through hole for the transmission shaft to pass through, and a second mating part that mates with the first mating part is provided at the through hole; The tool holder is provided with a connecting part corresponding to the pencil sharpening outlet, and a connecting space is provided inside the connecting part. The connecting space communicates with the inside of the tool holder through the pencil sharpening outlet. One end of the drive shaft is located in the connecting space, and a third mating part is provided in the connecting space to mate with the first mating part. The length of the drive shaft's moving path is less than the depth of the connecting space, and the first mating part is always in a mating state with the third mating part.

3. The automatic pen feeding and discharging structure of the electric pencil sharpener according to claim 2, characterized in that, The control module includes a switching assembly, which includes a switching gear, a gear mounting shaft, and a switching rack. A mounting plate is fixedly mounted on the mounting base, and the switching rack is movably mounted on the mounting plate. The gear mounting shaft is rotatably mounted on the mounting base and / or the mounting plate. The switching gear includes a first switching gear and a second switching gear mounted on the gear mounting shaft. The first switching gear and the switching rack mesh with each other. A circumferentially arranged mating tooth is provided at the end of the drive shaft away from the tool holder. The second switching gear is located on the moving path of the mating tooth. The drive shaft drives the gear mounting shaft and the first switching gear to rotate through the engagement of the mating tooth with the second switching gear. The switching rack works in conjunction with the control component, and its own movement triggers the control component to switch the rotation direction of the drive motor.

4. The automatic pen feeding and discharging structure of the electric pencil sharpener according to claim 3, characterized in that, The transmission assembly includes a transmission gear that meshes with a drive motor and a rotating gear. The transmission gear and the rotating gear are assembled within a mounting base. A switching assembly and a mounting plate are assembled outside the mounting base and are located on the side of the mounting base away from the tool holder. An assembly space is provided within the mounting base, which communicates with the through hole and connection space of the rotating gear. The transmission shaft is disposed within the assembly space. The mounting base also has an opening through which one end of the transmission shaft with mating teeth protrudes from the assembly space and meshes with the second switching gear. A limiting block with a diameter larger than the inner diameter of the opening is also provided on the portion of the transmission shaft located within the assembly space.

5. The automatic pen feeding and discharging structure of the electric pencil sharpener according to claim 4, characterized in that, The device includes an adjustment mechanism, which includes an adjustment knob for adjusting the position of the second switching gear; both ends of the gear mounting shaft are rotatably connected to the mounting base and the mounting plate, and the gear mounting shaft can move along its own axial direction; the adjustment knob is rotatably mounted on the mounting plate; one end of the gear mounting shaft passes through the mounting plate, and the inner surface of the adjustment knob is provided with an inclined contact surface that mates with the gear mounting shaft.

6. The automatic pen feeding and discharging structure of the electric pencil sharpener according to claim 5, characterized in that, A return spring is fitted on the gear mounting shaft, with its two ends abutting against the mounting base and the surface of the second switching gear facing the mounting base, respectively.

7. The automatic pen feeding and discharging structure of the electric pencil sharpener according to claim 6, characterized in that, The device includes a reset mechanism that drives the drive shaft to reset. The reset mechanism includes a reset rod and a reset switch. The reset rod is connected to the drive shaft, and the reset switch works in conjunction with the reset rod to push the drive shaft toward the tool holder.

8. The automatic pen feeding and discharging structure of the electric pencil sharpener according to claim 3, characterized in that, The switching assembly includes a reset post and a reset spring; both the switching rack and the mounting plate are provided with reset posts, and the two ends of the reset spring cooperate with the reset posts on the switching rack and the mounting plate, respectively.

9. The automatic pen feeding and discharging structure of the electric pencil sharpener according to any one of claims 1 to 8, characterized in that, The pen feeding and discharging mechanism includes a vortex that cooperates with and rotates with the tool holder, as well as a first rotating shaft and a second rotating shaft that cooperate with the vortex. The surface of the vortex is provided with a vortex rack that is distributed in a turbine shape and has arc-shaped segments. The first rotating shaft and the second rotating shaft are provided with impellers that mesh with the vortex rack. The rotation of the vortex drives the first rotating shaft and the second rotating shaft to rotate. When the vortex rotates forward, it drives the first rotating shaft and the second rotating shaft to rotate inward to feed the pen. When the vortex rotates in reverse, it drives the first rotating shaft and the second rotating shaft to rotate outward to discharge the pen.

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